Initial revision

From-SVN: r26263

libjava/java/lang/Boolean.java

@@ -0,0 +1,95 @@
+/* Copyright (C) 1998, 1999  Cygnus Solutions
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+ 
+package java.lang;
+
+import java.io.Serializable;
+ 
+/**
+ * @author Warren Levy <warrenl@cygnus.com>
+ * @date September 3, 1998.  
+ */
+/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
+ * "The Java Language Specification", ISBN 0-201-63451-1
+ * plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
+ * Status:  Believed complete and correct.
+ */
+ 
+public final class Boolean extends Object implements Serializable
+{
+  public static final Boolean FALSE = new Boolean(false);
+  public static final Boolean TRUE = new Boolean(true);
+
+  // This initialization is seemingly circular, but it is accepted
+  // by javac, and is handled specially by gcc.
+  public static final Class TYPE = boolean.class;
+
+  /* The boolean value of the instance. */
+  private boolean value;
+
+  public Boolean(boolean boolVal)
+  {
+    value = boolVal;
+  }
+
+  public Boolean(String strVal)
+  {
+    value = strVal.equalsIgnoreCase("true");
+  }
+
+  public boolean booleanValue()
+  {
+    return value;
+  }
+
+  public boolean equals(Object obj)
+  {
+    /* Don't need to compare obj to null as instanceof will do this. */
+    if (obj instanceof Boolean)
+      return value == ((Boolean) obj).value;
+    return false;
+  }
+
+  public static boolean getBoolean(String property)
+  {
+    /* TBD: If a security manager exists and it doesn't permit accessing
+     * the property, it will throw an exception.  Should we catch it?
+     */
+    try
+      {
+	String val = System.getProperty(property);
+	return val == null ? false : val.equalsIgnoreCase("true");
+      }
+    catch (SecurityException e)
+      {
+        return false;
+      }
+  }
+
+  public int hashCode()
+  {
+    /* These values are from the Java Lang. Spec. (Sec 20.4.7).
+     * TBD: They could be made private static final fields but they're only
+     * used here (and shouldn't be used anywhere else), though it might be
+     * useful to grep on something like JAVA_HASH_* values for us as
+     * developers.
+     */
+    return value ? 1231 : 1237;
+  }
+
+  public String toString()
+  {
+    return value ? "true" : "false";
+  }
+
+  public static Boolean valueOf(String str)
+  {
+    /* This returns a Boolean (big B), not a boolean (little b). */
+    return str.equalsIgnoreCase("true") ? TRUE : FALSE;
+  }
+}