- /*
- * 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.apache.commons.jxpath.ri;
-
-
- import java.util.HashMap;
- import java.util.Iterator;
- import java.util.Map;
-
- import org.apache.commons.jxpath.Pointer;
- import org.apache.commons.jxpath.ri.model.NodeIterator;
- import org.apache.commons.jxpath.ri.model.NodePointer;
-
- /**
- * The reference implementation of JXPathContext.
- *
- * @author Dmitri Plotnikov
- * @version $Revision: 1.2 $ $Date: 2004/06/29 22:57:20 $
- */
- public class NamespaceResolver implements Cloneable {
-
- protected HashMap namespaceMap = new HashMap();
- protected HashMap reverseMap;
- protected NodePointer pointer;
- private boolean sealed;
-
- /**
- * Registers a namespace prefix.
- *
- * @param prefix A namespace prefix
- * @param namespaceURI A URI for that prefix
- */
- public void registerNamespace(String prefix, String namespaceURI) {
- namespaceMap.put(prefix, namespaceURI);
- reverseMap = null;
- }
-
- /**
- * Register a namespace for the expression context.
- */
- public void setNamespaceContextPointer(NodePointer pointer) {
- this.pointer = pointer;
- }
-
- public Pointer getNamespaceContextPointer() {
- return pointer;
- }
-
- /**
- * Given a prefix, returns a registered namespace URI. If the requested
- * prefix was not defined explicitly using the registerNamespace method,
- * JXPathContext will then check the context node to see if the prefix is
- * defined there. See
- * {@link #setNamespaceContextPointer(Pointer) setNamespaceContextPointer}.
- *
- * @param prefix The namespace prefix to look up
- * @return namespace URI or null if the prefix is undefined.
- */
- public String getNamespaceURI(String prefix) {
- String uri = (String) namespaceMap.get(prefix);
- if (uri == null && pointer != null) {
- uri = pointer.getNamespaceURI(prefix);
- }
- // System.err.println("For prefix " + prefix + " URI=" + uri);
- return uri;
- }
-
- public String getPrefix(String namespaceURI) {
- if (reverseMap == null) {
- reverseMap = new HashMap();
- NodeIterator ni = pointer.namespaceIterator();
- if (ni != null) {
- for (int position = 1; ni.setPosition(position); position++) {
- NodePointer nsPointer = ni.getNodePointer();
- QName qname = nsPointer.getName();
- reverseMap.put(qname.getPrefix(), qname.getName());
- }
- }
- Iterator it = namespaceMap.entrySet().iterator();
- while (it.hasNext()) {
- Map.Entry entry = (Map.Entry) it.next();
- reverseMap.put(entry.getValue(), entry.getKey());
- }
- }
- String prefix = (String) reverseMap.get(namespaceURI);
- return prefix;
- }
-
- public boolean isSealed() {
- return sealed;
- }
-
- public void seal() {
- sealed = true;
- }
-
- public Object clone() {
- try {
- return super.clone();
- }
- catch (CloneNotSupportedException e) {
- // Of course, it's supported.
- e.printStackTrace();
- return null;
- }
- }
- }