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   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE 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 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE 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 AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * reserved comment block
   * DO NOT REMOVE OR ALTER!
   */
  /*
   * Copyright 2001, 2002,2004 The Apache Software Foundation.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package jaxp.sun.org.apache.xerces.internal.xni;
  
  import java.util.Enumeration;
  import java.util.Vector;
  
  /**
   * Represents an interface to query namespace information.
   * <p>
   * The prefix and namespace must be identical references for equal strings, thus
   * each string should be internalized (@see String.intern())
   * or added to the <code>SymbolTable</code>
   *
   * @see <a href="../../../../../xerces2/com/sun/org/apache/xerces/internal/util/SymbolTable.html">
   * com.sun.org.apache.xerces.internal.util.SymbolTable</a>
   *
   * @author Andy Clark, IBM
   *
   */
  public interface NamespaceContext {
  
      //
      // Constants
      //
  
      /**
       * The XML Namespace ("http://www.w3.org/XML/1998/namespace"). This is
       * the Namespace URI that is automatically mapped to the "xml" prefix.
       */
      public final static String XML_URI = "http://www.w3.org/XML/1998/namespace".intern();
  
      /**
       * XML Information Set REC
       * all namespace attributes (including those named xmlns,
       * whose [prefix] property has no value) have a namespace URI of http://www.w3.org/2000/xmlns/
       */
      public final static String XMLNS_URI = "http://www.w3.org/2000/xmlns/".intern();
  
      //
      // NamespaceContext methods
      //
  
      /**
       * Start a new Namespace context.
       * <p>
       * A new context should be pushed at the beginning
       * of each XML element: the new context will automatically inherit
       * the declarations of its parent context, but it will also keep
       * track of which declarations were made within this context.
       * <p>
       *
       * @see #popContext
       */
      public void pushContext();
  
     /**
       * Revert to the previous Namespace context.
       * <p>
       * The context should be popped at the end of each
       * XML element.  After popping the context, all Namespace prefix
       * mappings that were previously in force are restored.
       * <p>
       * Users must not attempt to declare additional Namespace
       * prefixes after popping a context, unless you push another
       * context first.
       *
       * @see #pushContext
       */
      public void popContext();
  
      /**
       * Declare a Namespace prefix.
       * <p>
       * This method declares a prefix in the current Namespace
       * context; the prefix will remain in force until this context
       * is popped, unless it is shadowed in a descendant context.
       * <p>
       * Note that to declare a default Namespace, use the empty string.
       * The prefixes "xml" and "xmlns" can't be rebound.
       * <p>
       * Note that you must <em>not</em> declare a prefix after
       * you've pushed and popped another Namespace.
       *
       * @param prefix The prefix to declare, or null for the empty
       *        string.
       * @param uri The Namespace URI to associate with the prefix.
       *
       * @return true if the prefix was legal, false otherwise
       *
       * @see #getURI
       * @see #getDeclaredPrefixAt
       */
      public boolean declarePrefix(String prefix, String uri);
  
  
      /**
       * Look up a prefix and get the currently-mapped Namespace URI.
       * <p>
       * This method looks up the prefix in the current context. If no mapping
       * is found, this methods will continue lookup in the parent context(s).
       * Use the empty string ("") for the default Namespace.
       *
       * @param prefix The prefix to look up.
       *
       * @return The associated Namespace URI, or null if the prefix
       *         is undeclared in this context.
       */
      public String getURI(String prefix);
  
      /**
       * Look up a namespace URI and get one of the mapped prefix.
       * <p>
       * This method looks up the namespace URI in the current context.
       * If more than one prefix is currently mapped to the same URI,
       * this method will make an arbitrary selection
       * If no mapping is found, this methods will continue lookup in the
       * parent context(s).
       *
       * @param uri The namespace URI to look up.
       *
       * @return One of the associated prefixes, or null if the uri
       *         does not map to any prefix.
       *
       * @see #getPrefix
       */
      public String getPrefix(String uri);
  
  
      /**
       * Return a count of locally declared prefixes, including
       * the default prefix if bound.
       */
      public int getDeclaredPrefixCount();
  
      /**
       * Returns the prefix at the specified index in the current context.
       */
      public String getDeclaredPrefixAt(int index);
  
          /**
           * Return an enumeration of all prefixes whose declarations are active
       * in the current context. This includes declarations from parent contexts
       * that have not been overridden.
           * @return Enumeration
           */
      public Enumeration getAllPrefixes();
  
      /**
       * Reset this Namespace support object for reuse.
       *
       * <p>It is necessary to invoke this method before reusing the
       * Namespace support object for a new session.</p>
       *
       * <p>Note that implementations of this method need to ensure that
       * the declaration of the prefixes "xmlns" and "xml" are available.</p>
       */
      public void reset();
  
  
  } // interface NamespaceContext
  