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+/* SmallHtmlAttributeSet.java -- Small fixed HTML attribute set
+   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 gnu.javax.swing.text.html.parser;
+
+import java.io.Serializable;
+import java.util.Enumeration;
+import java.util.NoSuchElementException;
+
+import javax.swing.text.AttributeSet;
+import javax.swing.text.html.HTML.Attribute;
+import javax.swing.text.html.HTML.Tag;
+
+/**
+ * Small fixed HTML attribute set. The most of the HTML elements contain only
+ * several attributes. With four attributes, the number of operations in more
+ * complex algorithms is not larger than using the naive algorithm.
+ *
+ * Same as HtmlAttributeSet, this set allows both strings and non-string as
+ * keys. The strings are case insensitive, the non strings are compared with
+ * .equals.
+ *
+ * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
+ */
+public class SmallHtmlAttributeSet
+    implements AttributeSet, Cloneable, Serializable
+{
+  private static final long serialVersionUID = 1;
+
+  /**
+   * The keys, stored in this attribute set.
+   */
+  final Object[] keys;
+
+  /**
+   * The values, stored in this attribute set.
+   */
+  final Object[] values;
+
+  /**
+   * The parent, used for resolving the values, not found in this set.
+   */
+  final AttributeSet parent;
+
+  /**
+   * Create a new small fixed attribute set that contains the unchangeable copy
+   * of the passed attribute set and inherits its parent.
+   *
+   * @param copyFrom the attribute set, containing the attribute values to copy.
+   */
+  public SmallHtmlAttributeSet(AttributeSet copyFrom)
+  {
+    int n = copyFrom.getAttributeCount();
+
+    keys = new Object[n];
+    values = new Object[n];
+    parent = copyFrom.getResolveParent();
+
+    Enumeration en = copyFrom.getAttributeNames();
+    Object key;
+    Object value;
+
+    for (int i = 0; i < n; i++)
+      {
+        key = en.nextElement();
+        keys[i] = key;
+        value = copyFrom.getAttribute(key);
+        values[i] = value;
+      }
+  }
+
+  public boolean containsAttribute(Object name, Object value)
+  {
+    Object contains = getAttribute(name);
+    if (value == null)
+      return value == contains;
+    else
+      return value.equals(contains);
+  }
+
+  public boolean containsAttributes(AttributeSet attributes)
+  {
+    if (attributes == this)
+      return true;
+    Object v;
+    for (int i = 0; i < keys.length; i++)
+      {
+        v = attributes.getAttribute(keys[i]);
+        if (v != values[i])
+          {
+            if (values[i] == null)
+              return false;
+            else if (! values[i].equals(v))
+              return false;
+          }
+      }
+    return true;
+  }
+
+  /**
+   * THIS can be safely returned as the set is not mutable.
+   */
+  public AttributeSet copyAttributes()
+  {
+    return this;
+  }
+
+  /**
+   * Get the attribute value, matching this key. If not found in this set, the
+   * call is delegated to parent.
+   *
+   * @return the value, matching key (or null if none).
+   */
+  public Object getAttribute(Object key)
+  {
+    // Null and HTML attributes or tags can be searched by direct comparison.
+    if (key == null || key instanceof Attribute || key instanceof Tag)
+      {
+        for (int i = 0; i < keys.length; i++)
+          {
+            if (keys[i] == key)
+              return values[i];
+          }
+      }
+
+    // Strings are case insensitive. Only string can be match the string.
+    else if (key instanceof String)
+      {
+        String ks = (String) key;
+        for (int i = 0; i < keys.length; i++)
+          {
+            if (keys[i] instanceof String)
+              if (ks.equalsIgnoreCase((String) keys[i]))
+                return values[i];
+          }
+      }
+
+    // Otherwise, defaults to .equals
+    else
+      {
+        for (int i = 0; i < keys.length; i++)
+          {
+            if (key.equals(keys[i]))
+              return values[i];
+          }
+      }
+
+    if (parent != null)
+      return parent.getAttribute(key);
+    else
+      return null;
+  }
+
+  /**
+   * Get the number of the stored attributes.
+   */
+  public int getAttributeCount()
+  {
+    return keys.length;
+  }
+
+  /**
+   * Get enumeration, containing the attribute names. No guard agains the
+   * concurent modification is required as the set is not mutable.
+   */
+  public Enumeration getAttributeNames()
+  {
+    return new Enumeration()
+    {
+      int p = 0;
+
+      public boolean hasMoreElements()
+      {
+        return p < keys.length;
+      }
+
+      public Object nextElement()
+      {
+        if (p < keys.length)
+          return keys[p++];
+        else
+          throw new NoSuchElementException();
+      }
+    };
+  }
+
+  /**
+   * Get the parent that this set uses to resolve the not found attributes.
+   */
+  public AttributeSet getResolveParent()
+  {
+    return parent;
+  }
+
+  /**
+   * Check if the given attribute is defined in this set (not in the parent).
+   */
+  public boolean isDefined(Object attrName)
+  {
+    if (attrName instanceof String)
+      attrName = ((String) attrName).toLowerCase();
+
+    for (int i = 0; i < keys.length; i++)
+      {
+        if (attrName.equals(keys[i]))
+          return true;
+      }
+    return false;
+  }
+
+  /**
+   * Check this set and another set for equality by content.
+   */
+  public boolean isEqual(AttributeSet attr)
+  {
+    return keys.length == attr.getAttributeCount() && containsAttributes(attr);
+  }
+
+  /**
+   * It is safe to return THIS on cloning, if one happens.
+   */
+  protected Object clone()
+  {
+    return this;
+  }
+}