/*
* Copyright 2004-2009 the original author or authors.
*
* 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.compass.core.converter.mapping.xsem;
import org.compass.core.converter.ConversionException;
import org.compass.core.mapping.xsem.XPathEnabledMapping;
import org.compass.core.xml.XmlObject;
import org.compass.core.xml.XmlXPathExpression;
/**
* A set of utilities for xml conversion.
*
* @author kimchy
*/
public abstract class XmlConverterUtils {
/**
* Executes the given xpath expression (using {@link XPathEnabledMapping} and returns
* a list of xml objects.
* <p/>
* Handles compilation of xpath expression if possible, and storing the compiled xpath
* expressions in the {@link XPathEnabledMapping}.
*
* @param xmlObject The xml object to execute the xpath expression against.
* @param xpathMapping The xpath mapping definiton
* @return The list of xml objects matching the xpath expression
* @throws ConversionException
*/
public static XmlObject[] select(XmlObject xmlObject, XPathEnabledMapping xpathMapping) throws ConversionException {
if (xpathMapping.getXPathExpression() != null) {
try {
return xpathMapping.getXPathExpression().select(xmlObject);
} catch (Exception e) {
throw new ConversionException("Failed to select xpath [" + xpathMapping.getXPath() + "]", e);
}
}
if (xmlObject.canCompileXpath()) {
XmlXPathExpression xPathExpression;
try {
xPathExpression = xmlObject.compile(xpathMapping.getXPath());
} catch (Exception e) {
throw new ConversionException("Failed to compile xpath [" + xpathMapping.getXPath() + "]", e);
}
xpathMapping.setXPathExpression(xPathExpression);
try {
return xPathExpression.select(xmlObject);
} catch (Exception e) {
throw new ConversionException("Failed to select xpath [" + xpathMapping.getXPath() + "]", e);
}
}
try {
return xmlObject.selectPath(xpathMapping.getXPath());
} catch (Exception e) {
throw new ConversionException("Failed to select xpath [" + xpathMapping.getXPath() + "]", e);
}
}
}