Merged gcj-eclipse branch to trunk.

From-SVN: r120621

libjava/classpath/javax/swing/text/html/MultiAttributeSet.java

@@ -0,0 +1,213 @@
+/* MultiAttributeSet.java -- Multiplexes between a set of AttributeSets
+   Copyright (C) 2006 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 javax.swing.text.html;
+
+import java.util.Enumeration;
+import java.util.NoSuchElementException;
+
+import javax.swing.text.AttributeSet;
+import javax.swing.text.SimpleAttributeSet;
+
+/**
+ * An AttributeSet impl that multiplexes between a set of other AttributeSets.
+ *
+ * @author Roman Kennke (kennke@aicas.com)
+ */
+class MultiAttributeSet
+  implements AttributeSet
+{
+
+  /**
+   * The Enumeration for the multiplexed names.
+   */
+  private class MultiNameEnumeration
+    implements Enumeration
+  {
+    /**
+     * The index of the current AttributeSet.
+     */
+    private int index;
+
+    /**
+     * The names Enumeration of the current AttributeSet.
+     */
+    private Enumeration current;
+
+    /**
+     * Creates a new instance.
+     */
+    MultiNameEnumeration()
+    {
+      index = 0;
+      current = multi[0].getAttributeNames();
+    }
+
+    public boolean hasMoreElements()
+    {
+      return current.hasMoreElements() || index < multi.length - 1;
+    }
+
+    public Object nextElement()
+    {
+      if (! current.hasMoreElements())
+        {
+          if (index < multi.length - 1)
+            {
+              index++;
+              current = multi[index].getAttributeNames();
+            }
+          else
+            throw new NoSuchElementException();
+        }
+      return current.nextElement();
+    }
+    
+  }
+
+  /**
+   * The AttributeSets to multiplex.
+   */
+  AttributeSet[] multi;
+
+  /**
+   * Provided for subclasses that need to initialize via {@link #init}.
+   */
+  MultiAttributeSet()
+  {
+    // Nothing to do here.
+  }
+
+  /**
+   * Creates a new instance.
+   *
+   * @param m the AttributeSets to multiplex
+   */
+  MultiAttributeSet(AttributeSet[] m)
+  {
+    init(m);
+  }
+
+  /**
+   * Provided for subclasses to initialize the attribute set.
+   *
+   * @param m the attributes to multiplex
+   */
+  void init(AttributeSet[] m)
+  {
+    multi = m;
+  }
+
+  public boolean containsAttribute(Object name, Object value)
+  {
+    boolean ret = false;
+    for (int i = 0; i < multi.length && ret == false; i++)
+      {
+        if (multi[i].containsAttribute(name, value))
+          ret = true;
+      }
+    return ret;
+  }
+
+  public boolean containsAttributes(AttributeSet attributes)
+  {
+    boolean ret = true;
+    Enumeration e = attributes.getAttributeNames();
+    while (ret && e.hasMoreElements())
+      {
+        Object key = e.nextElement();
+        ret = attributes.getAttribute(key).equals(getAttribute(key));
+      }
+    return ret;
+  }
+
+  public AttributeSet copyAttributes()
+  {
+    SimpleAttributeSet copy = new SimpleAttributeSet();
+    for (int i = 0; i < multi.length; i++)
+      {
+        copy.addAttributes(multi[i]);
+      }
+    return copy;
+  }
+
+  public Object getAttribute(Object key)
+  {
+    Object ret = null;
+    for (int i = 0; i < multi.length && ret == null; i++)
+      {
+        ret = multi[i].getAttribute(key);
+      }
+    return ret;
+  }
+
+  public int getAttributeCount()
+  {
+    int n = 0;
+    for (int i = 0; i < multi.length; i++)
+      {
+        n += multi[i].getAttributeCount();
+      }
+    return n;
+  }
+
+  public Enumeration getAttributeNames()
+  {
+    return new MultiNameEnumeration();
+  }
+
+  public AttributeSet getResolveParent()
+  {
+    return null;
+  }
+
+  public boolean isDefined(Object attrName)
+  {
+    boolean ret = false;
+    for (int i = 0; i < multi.length && ! ret; i++)
+      ret = multi[i].isDefined(attrName);
+    return ret;
+  }
+
+  public boolean isEqual(AttributeSet attr)
+  {
+    return getAttributeCount() == attr.getAttributeCount()
+           && containsAttributes(attr);
+  }
+
+}