bundles/org.eclipse.wst.xsl.core/src_validation/org/eclipse/wst/xsl/core/internal/compiler/xslt10/extensions/ExtensionNamespaceContext.java

/*******************************************************************************
 * Copyright (c) 2007 Standards for Technology in Automotive Retail
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     David Carver - STAR - bug 224197 - initial API and implementation
 *                    based on work from Apache Xalan 2.7.0
 *******************************************************************************/

/*
 * Copyright 1999-2004 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 org.eclipse.wst.xsl.core.internal.compiler.xslt10.extensions;

import java.util.Iterator;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import org.eclipse.wst.xsl.core.compiler.xslt10.res.Messages;
import org.eclipse.wst.xsl.core.compiler.xslt10.res.XSLTErrorResources;

/**
 * A sample implementation of NamespaceContext, with support for EXSLT extension
 * functions and Java extension functions.
 */
@SuppressWarnings("nls")
public class ExtensionNamespaceContext implements NamespaceContext {
	public static final String EXSLT_PREFIX = "exslt";
	public static final String EXSLT_URI = "http://exslt.org/common";
	public static final String EXSLT_MATH_PREFIX = "math";
	public static final String EXSLT_MATH_URI = "http://exslt.org/math";
	public static final String EXSLT_SET_PREFIX = "set";
	public static final String EXSLT_SET_URI = "http://exslt.org/sets";
	public static final String EXSLT_STRING_PREFIX = "str";
	public static final String EXSLT_STRING_URI = "http://exslt.org/strings";
	public static final String EXSLT_DATETIME_PREFIX = "datetime";
	public static final String EXSLT_DATETIME_URI = "http://exslt.org/dates-and-times";
	public static final String EXSLT_DYNAMIC_PREFIX = "dyn";
	public static final String EXSLT_DYNAMIC_URI = "http://exslt.org/dynamic";
	public static final String JAVA_EXT_PREFIX = "java";
	public static final String JAVA_EXT_URI = "http://xml.apache.org/xalan/java";

	/**
	 * Return the namespace uri for a given prefix
	 */
	public String getNamespaceURI(String prefix) {
		if (prefix == null)
			throw new IllegalArgumentException(Messages.createMessage(
					XSLTErrorResources.ER_NAMESPACE_CONTEXT_NULL_PREFIX, null));

		if (prefix.equals(XMLConstants.DEFAULT_NS_PREFIX))
			return XMLConstants.NULL_NS_URI;
		else if (prefix.equals(XMLConstants.XML_NS_PREFIX))
			return XMLConstants.XML_NS_URI;
		else if (prefix.equals(XMLConstants.XMLNS_ATTRIBUTE))
			return XMLConstants.XMLNS_ATTRIBUTE_NS_URI;
		else if (prefix.equals(EXSLT_PREFIX))
			return EXSLT_URI;
		else if (prefix.equals(EXSLT_MATH_PREFIX))
			return EXSLT_MATH_URI;
		else if (prefix.equals(EXSLT_SET_PREFIX))
			return EXSLT_SET_URI;
		else if (prefix.equals(EXSLT_STRING_PREFIX))
			return EXSLT_STRING_URI;
		else if (prefix.equals(EXSLT_DATETIME_PREFIX))
			return EXSLT_DATETIME_URI;
		else if (prefix.equals(EXSLT_DYNAMIC_PREFIX))
			return EXSLT_DYNAMIC_URI;
		else if (prefix.equals(JAVA_EXT_PREFIX))
			return JAVA_EXT_URI;
		else
			return XMLConstants.NULL_NS_URI;
	}

	/**
	 * Return the prefix for a given namespace uri.
	 */
	public String getPrefix(String namespace) {
		if (namespace == null)
			throw new IllegalArgumentException(Messages.createMessage(
					XSLTErrorResources.ER_NAMESPACE_CONTEXT_NULL_NAMESPACE,
					null));

		if (namespace.equals(XMLConstants.XML_NS_URI))
			return XMLConstants.XML_NS_PREFIX;
		else if (namespace.equals(XMLConstants.XMLNS_ATTRIBUTE_NS_URI))
			return XMLConstants.XMLNS_ATTRIBUTE;
		else if (namespace.equals(EXSLT_URI))
			return EXSLT_PREFIX;
		else if (namespace.equals(EXSLT_MATH_URI))
			return EXSLT_MATH_PREFIX;
		else if (namespace.equals(EXSLT_SET_URI))
			return EXSLT_SET_PREFIX;
		else if (namespace.equals(EXSLT_STRING_URI))
			return EXSLT_STRING_PREFIX;
		else if (namespace.equals(EXSLT_DATETIME_URI))
			return EXSLT_DATETIME_PREFIX;
		else if (namespace.equals(EXSLT_DYNAMIC_URI))
			return EXSLT_DYNAMIC_PREFIX;
		else if (namespace.equals(JAVA_EXT_URI))
			return JAVA_EXT_PREFIX;
		else
			return null;
	}

	public Iterator getPrefixes(String namespace) {
		final String result = getPrefix(namespace);

		return new Iterator() {

			private boolean isFirstIteration = (result != null);

			public boolean hasNext() {
				return isFirstIteration;
			}

			public Object next() {
				if (isFirstIteration) {
					isFirstIteration = false;
					return result;
				} else
					return null;
			}

			public void remove() {
				throw new UnsupportedOperationException();
			}
		};
	}
}