org.xchain.framework.util.QNameConverter.java Source code

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Here is the source code for org.xchain.framework.util.QNameConverter.java

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/**
 *    Copyright 2011 meltmedia
 *
 *    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.xchain.framework.util;

import javax.xml.namespace.QName;
import org.apache.commons.beanutils.Converter;
import org.apache.commons.beanutils.ConversionException;
import org.apache.commons.jxpath.JXPathContext;
import org.xchain.framework.lifecycle.Execution;

/**
 * @author Christian Trimble
 */
public class QNameConverter implements Converter {
    public Object convert(Class type, Object value) {
        if (value == null) {
            return null;
        }

        if (QName.class.isAssignableFrom(value.getClass())) {
            return value;
        }

        // if we are currently in an execution, then look up any prefixes based on the currently executing context.
        if (Execution.inExecution() && value instanceof String) {
            JXPathContext context = Execution.getLocalContext();
            try {
                return JXPathContextUtil.stringToQName(context, (String) value);
            } catch (Exception e) {
                throw new ConversionException(e.getMessage(), e);
            }
        } else if (value instanceof String) {
            try {
                return QName.valueOf((String) value);
            } catch (Exception e) {
                throw new ConversionException("The string '" + value + "' could not be converted into a QName.");
            }
        }

        throw new ConversionException(
                "The object of type '" + value.getClass() + "' could not be converted to '" + QName.class + "'.");
    }
}