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From-SVN: r102075
This commit is contained in:
Tom Tromey 2005-07-16 00:31:27 +00:00
parent f911ba985a
commit 37d375fdc5
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249
libjava/classpath/vm/reference/java/lang/reflect/Constructor.java Normal file
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/* java.lang.reflect.Constructor - reflection of Java constructors
Copyright (C) 1998, 2001 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
Linking this library statically or dynamically with other modules is
making a combined work based on this library. Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module. An independent module is a module which is not derived from
or based on this library. If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so. If you do not wish to do so, delete this
exception statement from your version. */
package java.lang.reflect;
import java.util.Arrays;
/**
* The Constructor class represents a constructor of a class. It also allows
* dynamic creation of an object, via reflection. Invocation on Constructor
* objects knows how to do widening conversions, but throws
* {@link IllegalArgumentException} if a narrowing conversion would be
* necessary. You can query for information on this Constructor regardless
* of location, but construction access may be limited by Java language
* access controls. If you can't do it in the compiler, you can't normally
* do it here either.<p>
*
* <B>Note:</B> This class returns and accepts types as Classes, even
* primitive types; there are Class types defined that represent each
* different primitive type. They are <code>java.lang.Boolean.TYPE,
* java.lang.Byte.TYPE,</code>, also available as <code>boolean.class,
* byte.class</code>, etc. These are not to be confused with the
* classes <code>java.lang.Boolean, java.lang.Byte</code>, etc., which are
* real classes.<p>
*
* Also note that this is not a serializable class. It is entirely feasible
* to make it serializable using the Externalizable interface, but this is
* on Sun, not me.
*
* @author John Keiser
* @author Eric Blake <ebb9@email.byu.edu>
* @see Member
* @see Class
* @see java.lang.Class#getConstructor(Object[])
* @see java.lang.Class#getDeclaredConstructor(Object[])
* @see java.lang.Class#getConstructors()
* @see java.lang.Class#getDeclaredConstructors()
* @since 1.1
* @status updated to 1.4
*/
public final class Constructor
extends AccessibleObject implements Member
{
private Class clazz;
private int slot;
/**
* This class is uninstantiable except from native code.
*/
private Constructor(Class declaringClass,int slot)
{
this.clazz = declaringClass;
this.slot = slot;
}
private Constructor()
{
}
/**
* Gets the class that declared this constructor.
* @return the class that declared this member
*/
public Class getDeclaringClass()
{
return clazz;
}
/**
* Gets the name of this constructor (the non-qualified name of the class
* it was declared in).
* @return the name of this constructor
*/
public String getName()
{
return getDeclaringClass().getName();
}
/**
* Gets the modifiers this constructor uses. Use the <code>Modifier</code>
* class to interpret the values. A constructor can only have a subset of the
* following modifiers: public, private, protected.
*
* @return an integer representing the modifiers to this Member
* @see Modifier
*/
public native int getModifiers();
/**
* Get the parameter list for this constructor, in declaration order. If the
* constructor takes no parameters, returns a 0-length array (not null).
*
* @return a list of the types of the constructor's parameters
*/
public native Class[] getParameterTypes();
/**
* Get the exception types this constructor says it throws, in no particular
* order. If the constructor has no throws clause, returns a 0-length array
* (not null).
*
* @return a list of the types in the constructor's throws clause
*/
public native Class[] getExceptionTypes();
/**
* Compare two objects to see if they are semantically equivalent.
* Two Constructors are semantically equivalent if they have the same
* declaring class and the same parameter list. This ignores different
* exception clauses, but since you can't create a Method except through the
* VM, this is just the == relation.
*
* @param o the object to compare to
* @return <code>true</code> if they are equal; <code>false</code> if not.
*/
public boolean equals(Object o)
{
if (!(o instanceof Constructor))
return false;
Constructor that = (Constructor)o;
if (this.getDeclaringClass() != that.getDeclaringClass())
return false;
if (!Arrays.equals(this.getParameterTypes(), that.getParameterTypes()))
return false;
return true;
}
/**
* Get the hash code for the Constructor. The Constructor hash code is the
* hash code of the declaring class's name.
*
* @return the hash code for the object
*/
public int hashCode()
{
return getDeclaringClass().getName().hashCode();
}
/**
* Get a String representation of the Constructor. A Constructor's String
* representation is "&lt;modifier&gt; &lt;classname&gt;(&lt;paramtypes&gt;)
* throws &lt;exceptions&gt;", where everything after ')' is omitted if
* there are no exceptions.<br> Example:
* <code>public java.io.FileInputStream(java.lang.Runnable)
* throws java.io.FileNotFoundException</code>
*
* @return the String representation of the Constructor
*/
public String toString()
{
// 128 is a reasonable buffer initial size for constructor
StringBuffer sb = new StringBuffer(128);
Modifier.toString(getModifiers(), sb).append(' ');
sb.append(getDeclaringClass().getName()).append('(');
Class[] c = getParameterTypes();
if (c.length > 0)
{
sb.append(c[0].getName());
for (int i = 1; i < c.length; i++)
sb.append(',').append(c[i].getName());
}
sb.append(')');
c = getExceptionTypes();
if (c.length > 0)
{
sb.append(" throws ").append(c[0].getName());
for (int i = 1; i < c.length; i++)
sb.append(',').append(c[i].getName());
}
return sb.toString();
}
/**
* Create a new instance by invoking the constructor. Arguments are
* automatically unwrapped and widened, if needed.<p>
*
* If this class is abstract, you will get an
* <code>InstantiationException</code>. If the constructor takes 0
* arguments, you may use null or a 0-length array for <code>args</code>.<p>
*
* If this Constructor enforces access control, your runtime context is
* evaluated, and you may have an <code>IllegalAccessException</code> if
* you could not create this object in similar compiled code. If the class
* is uninitialized, you trigger class initialization, which may end in a
* <code>ExceptionInInitializerError</code>.<p>
*
* Then, the constructor is invoked. If it completes normally, the return
* value will be the new object. If it completes abruptly, the exception is
* wrapped in an <code>InvocationTargetException</code>.
*
* @param args the arguments to the constructor
* @return the newly created object
* @throws IllegalAccessException if the constructor could not normally be
* called by the Java code (i.e. it is not public)
* @throws IllegalArgumentException if the number of arguments is incorrect;
* or if the arguments types are wrong even with a widening
* conversion
* @throws InstantiationException if the class is abstract
* @throws InvocationTargetException if the constructor throws an exception
* @throws ExceptionInInitializerError if construction triggered class
* initialization, which then failed
*/
public Object newInstance(Object args[])
throws InstantiationException, IllegalAccessException,
InvocationTargetException
{
return constructNative(args, clazz, slot);
}
private native Object constructNative(Object[] args, Class declaringClass,
int slot)
throws InstantiationException, IllegalAccessException,
InvocationTargetException;
}

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libjava/classpath/vm/reference/java/lang/reflect/Field.java Normal file
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/* java.lang.reflect.Field - reflection of Java fields
Copyright (C) 1998, 2001 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
Linking this library statically or dynamically with other modules is
making a combined work based on this library. Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module. An independent module is a module which is not derived from
or based on this library. If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so. If you do not wish to do so, delete this
exception statement from your version. */
package java.lang.reflect;
/**
* The Field class represents a member variable of a class. It also allows
* dynamic access to a member, via reflection. This works for both
* static and instance fields. Operations on Field objects know how to
* do widening conversions, but throw {@link IllegalArgumentException} if
* a narrowing conversion would be necessary. You can query for information
* on this Field regardless of location, but get and set access may be limited
* by Java language access controls. If you can't do it in the compiler, you
* can't normally do it here either.<p>
*
* <B>Note:</B> This class returns and accepts types as Classes, even
* primitive types; there are Class types defined that represent each
* different primitive type. They are <code>java.lang.Boolean.TYPE,
* java.lang.Byte.TYPE,</code>, also available as <code>boolean.class,
* byte.class</code>, etc. These are not to be confused with the
* classes <code>java.lang.Boolean, java.lang.Byte</code>, etc., which are
* real classes.<p>
*
* Also note that this is not a serializable class. It is entirely feasible
* to make it serializable using the Externalizable interface, but this is
* on Sun, not me.
*
* @author John Keiser
* @author Eric Blake <ebb9@email.byu.edu>
* @see Member
* @see Class
* @see Class#getField(String)
* @see Class#getDeclaredField(String)
* @see Class#getFields()
* @see Class#getDeclaredFields()
* @since 1.1
* @status updated to 1.4
*/
public final class Field
extends AccessibleObject implements Member
{
private Class declaringClass;
private String name;
private int slot;
/**
* This class is uninstantiable except natively.
*/
private Field(Class declaringClass, String name, int slot)
{
this.declaringClass = declaringClass;
this.name = name;
this.slot = slot;
}
/**
* Gets the class that declared this field, or the class where this field
* is a non-inherited member.
* @return the class that declared this member
*/
public Class getDeclaringClass()
{
return declaringClass;
}
/**
* Gets the name of this field.
* @return the name of this field
*/
public String getName()
{
return name;
}
/**
* Gets the modifiers this field uses. Use the <code>Modifier</code>
* class to interpret the values. A field can only have a subset of the
* following modifiers: public, private, protected, static, final,
* transient, and volatile.
*
* @return an integer representing the modifiers to this Member
* @see Modifier
*/
public native int getModifiers();
/**
* Gets the type of this field.
* @return the type of this field
*/
public native Class getType();
/**
* Compare two objects to see if they are semantically equivalent.
* Two Fields are semantically equivalent if they have the same declaring
* class, name, and type. Since you can't creat a Field except through
* the VM, this is just the == relation.
*
* @param o the object to compare to
* @return <code>true</code> if they are equal; <code>false</code> if not
*/
public boolean equals(Object o)
{
if (!(o instanceof Field))
return false;
Field that = (Field)o;
if (this.getDeclaringClass() != that.getDeclaringClass())
return false;
if (!this.getName().equals(that.getName()))
return false;
if (this.getType() != that.getType())
return false;
return true;
}
/**
* Get the hash code for the Field. The Field hash code is the hash code
* of its name XOR'd with the hash code of its class name.
*
* @return the hash code for the object.
*/
public int hashCode()
{
return getDeclaringClass().getName().hashCode() ^ getName().hashCode();
}
/**
* Get a String representation of the Field. A Field's String
* representation is "&lt;modifiers&gt; &lt;type&gt;
* &lt;class&gt;.&lt;fieldname&gt;".<br> Example:
* <code>public transient boolean gnu.parse.Parser.parseComplete</code>
*
* @return the String representation of the Field
*/
public String toString()
{
// 64 is a reasonable buffer initial size for field
StringBuffer sb = new StringBuffer(64);
Modifier.toString(getModifiers(), sb).append(' ');
sb.append(getType().getName()).append(' ');
sb.append(getDeclaringClass().getName()).append('.');
sb.append(getName());
return sb.toString();
}
/**
* Get the value of this Field. If it is primitive, it will be wrapped
* in the appropriate wrapper type (boolean = java.lang.Boolean).<p>
*
* If the field is static, <code>o</code> will be ignored. Otherwise, if
* <code>o</code> is null, you get a <code>NullPointerException</code>,
* and if it is incompatible with the declaring class of the field, you
* get an <code>IllegalArgumentException</code>.<p>
*
* Next, if this Field enforces access control, your runtime context is
* evaluated, and you may have an <code>IllegalAccessException</code> if
* you could not access this field in similar compiled code. If the field
* is static, and its class is uninitialized, you trigger class
* initialization, which may end in a
* <code>ExceptionInInitializerError</code>.<p>
*
* Finally, the field is accessed, and primitives are wrapped (but not
* necessarily in new objects). This method accesses the field of the
* declaring class, even if the instance passed in belongs to a subclass
* which declares another field to hide this one.
*
* @param o the object to get the value of this Field from
* @return the value of the Field
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if <code>o</code> is not an instance of
* the class or interface declaring this field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #getBoolean(Object)
* @see #getByte(Object)
* @see #getChar(Object)
* @see #getShort(Object)
* @see #getInt(Object)
* @see #getLong(Object)
* @see #getFloat(Object)
* @see #getDouble(Object)
*/
public native Object get(Object o)
throws IllegalAccessException;
/**
* Get the value of this boolean Field. If the field is static,
* <code>o</code> will be ignored.
*
* @param o the object to get the value of this Field from
* @return the value of the Field
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if this is not a boolean field of
* <code>o</code>, or if <code>o</code> is not an instance of the
* declaring class of this field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #get(Object)
*/
public native boolean getBoolean(Object o)
throws IllegalAccessException;
/**
* Get the value of this byte Field. If the field is static,
* <code>o</code> will be ignored.
*
* @param o the object to get the value of this Field from
* @return the value of the Field
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if this is not a byte field of
* <code>o</code>, or if <code>o</code> is not an instance of the
* declaring class of this field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #get(Object)
*/
public native byte getByte(Object o)
throws IllegalAccessException;
/**
* Get the value of this Field as a char. If the field is static,
* <code>o</code> will be ignored.
*
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if this is not a char field of
* <code>o</code>, or if <code>o</code> is not an instance
* of the declaring class of this field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #get(Object)
*/
public native char getChar(Object o)
throws IllegalAccessException;
/**
* Get the value of this Field as a short. If the field is static,
* <code>o</code> will be ignored.
*
* @param o the object to get the value of this Field from
* @return the value of the Field
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if this is not a byte or short
* field of <code>o</code>, or if <code>o</code> is not an instance
* of the declaring class of this field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #get(Object)
*/
public native short getShort(Object o)
throws IllegalAccessException;
/**
* Get the value of this Field as an int. If the field is static,
* <code>o</code> will be ignored.
*
* @param o the object to get the value of this Field from
* @return the value of the Field
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if this is not a byte, short, char, or
* int field of <code>o</code>, or if <code>o</code> is not an
* instance of the declaring class of this field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #get(Object)
*/
public native int getInt(Object o)
throws IllegalAccessException;
/**
* Get the value of this Field as a long. If the field is static,
* <code>o</code> will be ignored.
*
* @param o the object to get the value of this Field from
* @return the value of the Field
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if this is not a byte, short, char, int,
* or long field of <code>o</code>, or if <code>o</code> is not an
* instance of the declaring class of this field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #get(Object)
*/
public native long getLong(Object o)
throws IllegalAccessException;
/**
* Get the value of this Field as a float. If the field is static,
* <code>o</code> will be ignored.
*
* @param o the object to get the value of this Field from
* @return the value of the Field
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if this is not a byte, short, char, int,
* long, or float field of <code>o</code>, or if <code>o</code> is
* not an instance of the declaring class of this field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #get(Object)
*/
public native float getFloat(Object o)
throws IllegalAccessException;
/**
* Get the value of this Field as a double. If the field is static,
* <code>o</code> will be ignored.
*
* @param o the object to get the value of this Field from
* @return the value of the Field
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if this is not a byte, short, char, int,
* long, float, or double field of <code>o</code>, or if
* <code>o</code> is not an instance of the declaring class of this
* field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #get(Object)
*/
public native double getDouble(Object o)
throws IllegalAccessException;
/**
* Set the value of this Field. If it is a primitive field, the value
* will be unwrapped from the passed object (boolean = java.lang.Boolean).<p>
*
* If the field is static, <code>o</code> will be ignored. Otherwise, if
* <code>o</code> is null, you get a <code>NullPointerException</code>,
* and if it is incompatible with the declaring class of the field, you
* get an <code>IllegalArgumentException</code>.<p>
*
* Next, if this Field enforces access control, your runtime context is
* evaluated, and you may have an <code>IllegalAccessException</code> if
* you could not access this field in similar compiled code. This also
* occurs whether or not there is access control if the field is final.
* If the field is primitive, and unwrapping your argument fails, you will
* get an <code>IllegalArgumentException</code>; likewise, this error
* happens if <code>value</code> cannot be cast to the correct object type.
* If the field is static, and its class is uninitialized, you trigger class
* initialization, which may end in a
* <code>ExceptionInInitializerError</code>.<p>
*
* Finally, the field is set with the widened value. This method accesses
* the field of the declaring class, even if the instance passed in belongs
* to a subclass which declares another field to hide this one.
*
* @param o the object to set this Field on
* @param value the value to set this Field to
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if <code>value</code> cannot be
* converted by a widening conversion to the underlying type of
* the Field, or if <code>o</code> is not an instance of the class
* declaring this field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #setBoolean(Object, boolean)
* @see #setByte(Object, byte)
* @see #setChar(Object, char)
* @see #setShort(Object, short)
* @see #setInt(Object, int)
* @see #setLong(Object, long)
* @see #setFloat(Object, float)
* @see #setDouble(Object, double)
*/
public native void set(Object o, Object value)
throws IllegalAccessException;
/**
* Set this boolean Field. If the field is static, <code>o</code> will be
* ignored.
*
* @param o the object to set this Field on
* @param value the value to set this Field to
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if this is not a boolean field, or if
* <code>o</code> is not an instance of the class declaring this
* field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #set(Object, Object)
*/
public native void setBoolean(Object o, boolean value)
throws IllegalAccessException;
/**
* Set this byte Field. If the field is static, <code>o</code> will be
* ignored.
*
* @param o the object to set this Field on
* @param value the value to set this Field to
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if this is not a byte, short, int, long,
* float, or double field, or if <code>o</code> is not an instance
* of the class declaring this field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #set(Object, Object)
*/
public native void setByte(Object o, byte value)
throws IllegalAccessException;
/**
* Set this char Field. If the field is static, <code>o</code> will be
* ignored.
*
* @param o the object to set this Field on
* @param value the value to set this Field to
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if this is not a char, int, long,
* float, or double field, or if <code>o</code> is not an instance
* of the class declaring this field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #set(Object, Object)
*/
public native void setChar(Object o, char value)
throws IllegalAccessException;
/**
* Set this short Field. If the field is static, <code>o</code> will be
* ignored.
*
* @param o the object to set this Field on
* @param value the value to set this Field to
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if this is not a short, int, long,
* float, or double field, or if <code>o</code> is not an instance
* of the class declaring this field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #set(Object, Object)
*/
public native void setShort(Object o, short value)
throws IllegalAccessException;
/**
* Set this int Field. If the field is static, <code>o</code> will be
* ignored.
*
* @param o the object to set this Field on
* @param value the value to set this Field to
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if this is not an int, long, float, or
* double field, or if <code>o</code> is not an instance of the
* class declaring this field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #set(Object, Object)
*/
public native void setInt(Object o, int value)
throws IllegalAccessException;
/**
* Set this long Field. If the field is static, <code>o</code> will be
* ignored.
*
* @param o the object to set this Field on
* @param value the value to set this Field to
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if this is not a long, float, or double
* field, or if <code>o</code> is not an instance of the class
* declaring this field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #set(Object, Object)
*/
public native void setLong(Object o, long value)
throws IllegalAccessException;
/**
* Set this float Field. If the field is static, <code>o</code> will be
* ignored.
*
* @param o the object to set this Field on
* @param value the value to set this Field to
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if this is not a float or long field, or
* if <code>o</code> is not an instance of the class declaring this
* field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #set(Object, Object)
*/
public native void setFloat(Object o, float value)
throws IllegalAccessException;
/**
* Set this double Field. If the field is static, <code>o</code> will be
* ignored.
*
* @param o the object to set this Field on
* @param value the value to set this Field to
* @throws IllegalAccessException if you could not normally access this field
* (i.e. it is not public)
* @throws IllegalArgumentException if this is not a double field, or if
* <code>o</code> is not an instance of the class declaring this
* field
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static field triggered
* class initialization, which then failed
* @see #set(Object, Object)
*/
public native void setDouble(Object o, double value)
throws IllegalAccessException;
}

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libjava/classpath/vm/reference/java/lang/reflect/Method.java Normal file
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@ -0,0 +1,339 @@
/* java.lang.reflect.Method - reflection of Java methods
Copyright (C) 1998, 2001, 2002 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
Linking this library statically or dynamically with other modules is
making a combined work based on this library. Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module. An independent module is a module which is not derived from
or based on this library. If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so. If you do not wish to do so, delete this
exception statement from your version. */
package java.lang.reflect;
import java.util.Arrays;
/**
* The Method class represents a member method of a class. It also allows
* dynamic invocation, via reflection. This works for both static and
* instance methods. Invocation on Method objects knows how to do
* widening conversions, but throws {@link IllegalArgumentException} if
* a narrowing conversion would be necessary. You can query for information
* on this Method regardless of location, but invocation access may be limited
* by Java language access controls. If you can't do it in the compiler, you
* can't normally do it here either.<p>
*
* <B>Note:</B> This class returns and accepts types as Classes, even
* primitive types; there are Class types defined that represent each
* different primitive type. They are <code>java.lang.Boolean.TYPE,
* java.lang.Byte.TYPE,</code>, also available as <code>boolean.class,
* byte.class</code>, etc. These are not to be confused with the
* classes <code>java.lang.Boolean, java.lang.Byte</code>, etc., which are
* real classes.<p>
*
* Also note that this is not a serializable class. It is entirely feasible
* to make it serializable using the Externalizable interface, but this is
* on Sun, not me.
*
* @author John Keiser
* @author Eric Blake <ebb9@email.byu.edu>
* @see Member
* @see Class
* @see java.lang.Class#getMethod(String,Object[])
* @see java.lang.Class#getDeclaredMethod(String,Object[])
* @see java.lang.Class#getMethods()
* @see java.lang.Class#getDeclaredMethods()
* @since 1.1
* @status updated to 1.4
*/
public final class Method
extends AccessibleObject implements Member
{
Class declaringClass;
String name;
int slot;
/**
* This class is uninstantiable.
*/
private Method(Class declaringClass, String name, int slot)
{
this.declaringClass = declaringClass;
this.name = name;
this.slot = slot;
}
/**
* Gets the class that declared this method, or the class where this method
* is a non-inherited member.
* @return the class that declared this member
*/
public Class getDeclaringClass()
{
return declaringClass;
}
/**
* Gets the name of this method.
* @return the name of this method
*/
public String getName()
{
return name;
}
/**
* Gets the modifiers this method uses. Use the <code>Modifier</code>
* class to interpret the values. A method can only have a subset of the
* following modifiers: public, private, protected, abstract, static,
* final, synchronized, native, and strictfp.
*
* @return an integer representing the modifiers to this Member
* @see Modifier
*/
public native int getModifiers();
/**
* Gets the return type of this method.
* @return the type of this method
*/
public native Class getReturnType();
/**
* Get the parameter list for this method, in declaration order. If the
* method takes no parameters, returns a 0-length array (not null).
*
* @return a list of the types of the method's parameters
*/
public native Class[] getParameterTypes();
/**
* Get the exception types this method says it throws, in no particular
* order. If the method has no throws clause, returns a 0-length array
* (not null).
*
* @return a list of the types in the method's throws clause
*/
public native Class[] getExceptionTypes();
/**
* Compare two objects to see if they are semantically equivalent.
* Two Methods are semantically equivalent if they have the same declaring
* class, name, parameter list, and return type.
*
* @param o the object to compare to
* @return <code>true</code> if they are equal; <code>false</code> if not
*/
public boolean equals(Object o)
{
// Implementation note:
// The following is a correct but possibly slow implementation.
//
// This class has a private field 'slot' that could be used by
// the VM implementation to "link" a particular method to a Class.
// In that case equals could be simply implemented as:
//
// if (o instanceof Method)
// {
// Method m = (Method)o;
// return m.declaringClass == this.declaringClass
// && m.slot == this.slot;
// }
// return false;
//
// If a VM uses the Method class as their native/internal representation
// then just using the following would be optimal:
//
// return this == o;
//
if (!(o instanceof Method))
return false;
Method that = (Method)o;
if (this.getDeclaringClass() != that.getDeclaringClass())
return false;
if (!this.getName().equals(that.getName()))
return false;
if (this.getReturnType() != that.getReturnType())
return false;
if (!Arrays.equals(this.getParameterTypes(), that.getParameterTypes()))
return false;
return true;
}
/**
* Get the hash code for the Method. The Method hash code is the hash code
* of its name XOR'd with the hash code of its class name.
*
* @return the hash code for the object
*/
public int hashCode()
{
return getDeclaringClass().getName().hashCode() ^ getName().hashCode();
}
/**
* Get a String representation of the Method. A Method's String
* representation is "&lt;modifiers&gt; &lt;returntype&gt;
* &lt;methodname&gt;(&lt;paramtypes&gt;) throws &lt;exceptions&gt;", where
* everything after ')' is omitted if there are no exceptions.<br> Example:
* <code>public static int run(java.lang.Runnable,int)</code>
*
* @return the String representation of the Method
*/
public String toString()
{
// 128 is a reasonable buffer initial size for constructor
StringBuffer sb = new StringBuffer(128);
Modifier.toString(getModifiers(), sb).append(' ');
sb.append(getUserTypeName(getReturnType().getName())).append(' ');
sb.append(getDeclaringClass().getName()).append('.');
sb.append(getName()).append('(');
Class[] c = getParameterTypes();
if (c.length > 0)
{
sb.append(getUserTypeName(c[0].getName()));
for (int i = 1; i < c.length; i++)
sb.append(',').append(getUserTypeName(c[i].getName()));
}
sb.append(')');
c = getExceptionTypes();
if (c.length > 0)
{
sb.append(" throws ").append(c[0].getName());
for (int i = 1; i < c.length; i++)
sb.append(',').append(c[i].getName());
}
return sb.toString();
}
private static String getUserTypeName(String typeSpec)
{
int pos = 0;
String typeName = "";
String arrayPart = "";
while (typeSpec.charAt(pos) == '[')
{
arrayPart += "[]";
++pos;
}
switch (typeSpec.charAt(pos))
{
case 'Z':
typeName = "boolean";
break;
case 'B':
typeName = "byte";
break;
case 'C':
typeName = "char";
break;
case 'D':
typeName = "double";
break;
case 'F':
typeName = "float";
break;
case 'I':
typeName = "int";
break;
case 'J':
typeName = "long";
break;
case 'S':
typeName = "short";
break;
case 'L':
typeName = typeSpec.substring(pos + 1, typeSpec.length() - 1);
break;
default:
typeName = typeSpec;
break;
}
return typeName + arrayPart;
}
/**
* Invoke the method. Arguments are automatically unwrapped and widened,
* and the result is automatically wrapped, if needed.<p>
*
* If the method is static, <code>o</code> will be ignored. Otherwise,
* the method uses dynamic lookup as described in JLS 15.12.4.4. You cannot
* mimic the behavior of nonvirtual lookup (as in super.foo()). This means
* you will get a <code>NullPointerException</code> if <code>o</code> is
* null, and an <code>IllegalArgumentException</code> if it is incompatible
* with the declaring class of the method. If the method takes 0 arguments,
* you may use null or a 0-length array for <code>args</code>.<p>
*
* Next, if this Method enforces access control, your runtime context is
* evaluated, and you may have an <code>IllegalAccessException</code> if
* you could not acces this method in similar compiled code. If the method
* is static, and its class is uninitialized, you trigger class
* initialization, which may end in a
* <code>ExceptionInInitializerError</code>.<p>
*
* Finally, the method is invoked. If it completes normally, the return value
* will be null for a void method, a wrapped object for a primitive return
* method, or the actual return of an Object method. If it completes
* abruptly, the exception is wrapped in an
* <code>InvocationTargetException</code>.
*
* @param o the object to invoke the method on
* @param args the arguments to the method
* @return the return value of the method, wrapped in the appropriate
* wrapper if it is primitive
* @throws IllegalAccessException if the method could not normally be called
* by the Java code (i.e. it is not public)
* @throws IllegalArgumentException if the number of arguments is incorrect;
* if the arguments types are wrong even with a widening conversion;
* or if <code>o</code> is not an instance of the class or interface
* declaring this method
* @throws InvocationTargetException if the method throws an exception
* @throws NullPointerException if <code>o</code> is null and this field
* requires an instance
* @throws ExceptionInInitializerError if accessing a static method triggered
* class initialization, which then failed
*/
public Object invoke(Object o, Object[] args)
throws IllegalAccessException, InvocationTargetException
{
return invokeNative(o, args, declaringClass, slot);
}
/*
* NATIVE HELPERS
*/
private native Object invokeNative(Object o, Object[] args,
Class declaringClass, int slot)
throws IllegalAccessException, InvocationTargetException;
}