/* Copyright 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.xmlbeans.impl.store; | |
import java.util.List; | |
import java.util.Map; | |
import java.util.HashMap; | |
import java.lang.reflect.Constructor; | |
import org.apache.xmlbeans.impl.common.XPath; | |
public final class PathDelegate | |
{ | |
private static HashMap _constructors = new HashMap(); | |
private PathDelegate() | |
{} | |
private static synchronized void init(String implClassName) | |
{ | |
// default to Saxon | |
if (implClassName == null) | |
implClassName = "org.apache.xmlbeans.impl.xpath.saxon.XBeansXPath"; | |
Class selectPathInterfaceImpl = null; | |
boolean engineAvailable = true; | |
try | |
{ | |
selectPathInterfaceImpl = Class.forName(implClassName); | |
} | |
catch (ClassNotFoundException e) | |
{ | |
engineAvailable = false; | |
} | |
catch (NoClassDefFoundError e) | |
{ | |
engineAvailable = false; | |
} | |
if (engineAvailable) | |
{ | |
try | |
{ | |
Constructor constructor = selectPathInterfaceImpl.getConstructor( | |
new Class[] {String.class, String.class, Map.class, String.class}); | |
_constructors.put(implClassName, constructor); | |
} | |
catch (Exception e) | |
{ | |
throw new RuntimeException(e); | |
} | |
} | |
} | |
public static synchronized SelectPathInterface createInstance(String implClassName, | |
String xpath, String contextVar, Map namespaceMap) | |
{ | |
if (_constructors.get(implClassName) == null) | |
init(implClassName); | |
if (_constructors.get(implClassName) == null) | |
return null; | |
Constructor constructor = (Constructor)_constructors.get(implClassName); | |
try | |
{ | |
Object defaultNS = namespaceMap.get(XPath._DEFAULT_ELT_NS); | |
if (defaultNS != null) | |
namespaceMap.remove(XPath._DEFAULT_ELT_NS); | |
return (SelectPathInterface)constructor.newInstance( | |
new Object[] {xpath, contextVar, namespaceMap, (String)defaultNS}); | |
} | |
catch (Exception e) | |
{ | |
throw new RuntimeException(e); | |
} | |
} | |
public static interface SelectPathInterface | |
{ | |
public List selectPath(Object node); | |
} | |
} |