/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.util;
import org.apache.commons.jxpath.BasicNodeSet;
import org.apache.commons.jxpath.ExtendedKeyManager;
import org.apache.commons.jxpath.JXPathContext;
import org.apache.commons.jxpath.KeyManager;
import org.apache.commons.jxpath.NodeSet;
import org.apache.commons.jxpath.Pointer;
import org.apache.commons.jxpath.ri.InfoSetUtil;
/**
* Utility class.
*
* @author Matt Benson
* @since JXPath 1.3
* @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
*/
public class KeyManagerUtils {
/**
* Adapt KeyManager to implement ExtendedKeyManager.
*/
private static class SingleNodeExtendedKeyManager implements
ExtendedKeyManager {
private KeyManager delegate;
/**
* Create a new SingleNodeExtendedKeyManager.
* @param delegate KeyManager to wrap
*/
public SingleNodeExtendedKeyManager(KeyManager delegate) {
this.delegate = delegate;
}
public NodeSet getNodeSetByKey(JXPathContext context, String key,
Object value) {
Pointer pointer = delegate.getPointerByKey(context, key, InfoSetUtil.stringValue(value));
BasicNodeSet result = new BasicNodeSet();
result.add(pointer);
return result;
}
public Pointer getPointerByKey(JXPathContext context, String keyName,
String keyValue) {
return delegate.getPointerByKey(context, keyName, keyValue);
}
}
/**
* Get an ExtendedKeyManager from the specified KeyManager.
* @param keyManager to adapt, if necessary
* @return <code>keyManager</code> if it implements ExtendedKeyManager
* or a basic single-result ExtendedKeyManager that delegates to
* <code>keyManager</code>.
*/
public static ExtendedKeyManager getExtendedKeyManager(KeyManager keyManager) {
return keyManager instanceof ExtendedKeyManager ? (ExtendedKeyManager) keyManager
: new SingleNodeExtendedKeyManager(keyManager);
}
}
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