content: /*
   * Copyright (c) 2000, 2005, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code 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
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  // SAX default implementation for AttributeList.
  // http://www.saxproject.org
  // No warranty; no copyright -- use this as you will.
  // $Id: AttributeListImpl.java,v 1.2 2004/11/03 22:53:08 jsuttor Exp $
  
  package org.xml.sax.helpers;
  
  import org.xml.sax.AttributeList;
  
  import java.util.Vector;
  
  
  /**
   * Default implementation for AttributeList.
   *
   * <blockquote>
   * <em>This module, both source code and documentation, is in the
   * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
   * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a>
   * for further information.
   * </blockquote>
   *
   * <p>AttributeList implements the deprecated SAX1 {@link
   * org.xml.sax.AttributeList AttributeList} interface, and has been
   * replaced by the new SAX2 {@link org.xml.sax.helpers.AttributesImpl
   * AttributesImpl} interface.</p>
   *
   * <p>This class provides a convenience implementation of the SAX
   * {@link org.xml.sax.AttributeList AttributeList} interface.  This
   * implementation is useful both for SAX parser writers, who can use
   * it to provide attributes to the application, and for SAX application
   * writers, who can use it to create a persistent copy of an element's
   * attribute specifications:</p>
   *
   * <pre>
   * private AttributeList myatts;
   *
   * public void startElement (String name, AttributeList atts)
   * {
   *              // create a persistent copy of the attribute list
   *              // for use outside this method
   *   myatts = new AttributeListImpl(atts);
   *   [...]
   * }
   * </pre>
   *
   * <p>Please note that SAX parsers are not required to use this
   * class to provide an implementation of AttributeList; it is
   * supplied only as an optional convenience.  In particular,
   * parser writers are encouraged to invent more efficient
   * implementations.</p>
   *
   * @deprecated This class implements a deprecated interface,
   *             {@link org.xml.sax.AttributeList AttributeList};
   *             that interface has been replaced by
   *             {@link org.xml.sax.Attributes Attributes},
   *             which is implemented in the
   *             {@link org.xml.sax.helpers.AttributesImpl
   *            AttributesImpl} helper class.
   * @since SAX 1.0
   * @author David Megginson
   * @see org.xml.sax.AttributeList
   * @see org.xml.sax.DocumentHandler#startElement
   */
  public class AttributeListImpl implements AttributeList
  {
  
      /**
       * Create an empty attribute list.
       *
       * <p>This constructor is most useful for parser writers, who
       * will use it to create a single, reusable attribute list that
       * can be reset with the clear method between elements.</p>
       *
       * @see #addAttribute
       * @see #clear
       */
      public AttributeListImpl ()
      {
      }
  
  
      /**
       * Construct a persistent copy of an existing attribute list.
       *
       * <p>This constructor is most useful for application writers,
       * who will use it to create a persistent copy of an existing
       * attribute list.</p>
       *
       * @param atts The attribute list to copy
       * @see org.xml.sax.DocumentHandler#startElement
       */
      public AttributeListImpl (AttributeList atts)
      {
          setAttributeList(atts);
      }
  
  
  
      ////////////////////////////////////////////////////////////////////
      // Methods specific to this class.
      ////////////////////////////////////////////////////////////////////
  
  
      /**
       * Set the attribute list, discarding previous contents.
       *
       * <p>This method allows an application writer to reuse an
       * attribute list easily.</p>
       *
       * @param atts The attribute list to copy.
       */
      public void setAttributeList (AttributeList atts)
      {
          int count = atts.getLength();
  
          clear();
  
          for (int i = 0; i < count; i++) {
              addAttribute(atts.getName(i), atts.getType(i), atts.getValue(i));
          }
      }
  
  
      /**
       * Add an attribute to an attribute list.
       *
       * <p>This method is provided for SAX parser writers, to allow them
       * to build up an attribute list incrementally before delivering
       * it to the application.</p>
       *
       * @param name The attribute name.
       * @param type The attribute type ("NMTOKEN" for an enumeration).
       * @param value The attribute value (must not be null).
       * @see #removeAttribute
       * @see org.xml.sax.DocumentHandler#startElement
       */
      public void addAttribute (String name, String type, String value)
      {
          names.addElement(name);
          types.addElement(type);
          values.addElement(value);
      }
  
  
      /**
       * Remove an attribute from the list.
       *
       * <p>SAX application writers can use this method to filter an
       * attribute out of an AttributeList.  Note that invoking this
       * method will change the length of the attribute list and
       * some of the attribute's indices.</p>
       *
       * <p>If the requested attribute is not in the list, this is
       * a no-op.</p>
       *
       * @param name The attribute name.
       * @see #addAttribute
       */
      public void removeAttribute (String name)
      {
          int i = names.indexOf(name);
  
          if (i >= 0) {
              names.removeElementAt(i);
              types.removeElementAt(i);
              values.removeElementAt(i);
          }
      }
  
  
      /**
       * Clear the attribute list.
       *
       * <p>SAX parser writers can use this method to reset the attribute
       * list between DocumentHandler.startElement events.  Normally,
       * it will make sense to reuse the same AttributeListImpl object
       * rather than allocating a new one each time.</p>
       *
       * @see org.xml.sax.DocumentHandler#startElement
       */
      public void clear ()
      {
          names.removeAllElements();
          types.removeAllElements();
          values.removeAllElements();
      }
  
  
  
      ////////////////////////////////////////////////////////////////////
      // Implementation of org.xml.sax.AttributeList
      ////////////////////////////////////////////////////////////////////
  
  
      /**
       * Return the number of attributes in the list.
       *
       * @return The number of attributes in the list.
       * @see org.xml.sax.AttributeList#getLength
       */
      public int getLength ()
      {
          return names.size();
      }
  
  
      /**
       * Get the name of an attribute (by position).
       *
       * @param i The position of the attribute in the list.
       * @return The attribute name as a string, or null if there
       *         is no attribute at that position.
       * @see org.xml.sax.AttributeList#getName(int)
       */
      public String getName (int i)
      {
          if (i < 0) {
              return null;
          }
          try {
              return (String)names.elementAt(i);
          } catch (ArrayIndexOutOfBoundsException e) {
              return null;
          }
      }
  
  
      /**
       * Get the type of an attribute (by position).
       *
       * @param i The position of the attribute in the list.
       * @return The attribute type as a string ("NMTOKEN" for an
       *         enumeration, and "CDATA" if no declaration was
       *         read), or null if there is no attribute at
       *         that position.
       * @see org.xml.sax.AttributeList#getType(int)
       */
      public String getType (int i)
      {
          if (i < 0) {
              return null;
          }
          try {
              return (String)types.elementAt(i);
          } catch (ArrayIndexOutOfBoundsException e) {
              return null;
          }
      }
  
  
      /**
       * Get the value of an attribute (by position).
       *
       * @param i The position of the attribute in the list.
       * @return The attribute value as a string, or null if
       *         there is no attribute at that position.
       * @see org.xml.sax.AttributeList#getValue(int)
       */
      public String getValue (int i)
      {
          if (i < 0) {
              return null;
          }
          try {
              return (String)values.elementAt(i);
          } catch (ArrayIndexOutOfBoundsException e) {
              return null;
          }
      }
  
  
      /**
       * Get the type of an attribute (by name).
       *
       * @param name The attribute name.
       * @return The attribute type as a string ("NMTOKEN" for an
       *         enumeration, and "CDATA" if no declaration was
       *         read).
       * @see org.xml.sax.AttributeList#getType(java.lang.String)
       */
      public String getType (String name)
      {
          return getType(names.indexOf(name));
      }
  
  
      /**
       * Get the value of an attribute (by name).
       *
       * @param name The attribute name.
       * @see org.xml.sax.AttributeList#getValue(java.lang.String)
       */
      public String getValue (String name)
      {
          return getValue(names.indexOf(name));
      }
  
  
  
      ////////////////////////////////////////////////////////////////////
      // Internal state.
      ////////////////////////////////////////////////////////////////////
  
      Vector names = new Vector();
      Vector types = new Vector();
      Vector values = new Vector();
  
  }
  
  // end of AttributeListImpl.java
  