/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2001, 2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
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* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xerces" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
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*
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999, International
* Business Machines, Inc., http://www.apache.org. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package com.sun.org.apache.xerces.internal.xni;
import java.util.Enumeration;
/**
* 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
*
* @version $Id: NamespaceContext.java,v 1.10 2003/01/23 17:27:12 sandygao Exp $
*/
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
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