nl.clockwork.mule.common.transformer.AbstractXSLTransformer.java Source code

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Here is the source code for nl.clockwork.mule.common.transformer.AbstractXSLTransformer.java

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/*******************************************************************************
 * Copyright 2011 Clockwork
 * 
 * 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 nl.clockwork.mule.common.transformer;

import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.HashMap;
import java.util.Map;

import javax.xml.transform.Templates;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.mule.api.MuleMessage;
import org.mule.api.transformer.TransformerException;
import org.mule.transformer.AbstractMessageAwareTransformer;

public abstract class AbstractXSLTransformer extends AbstractMessageAwareTransformer {
    protected transient Log logger = LogFactory.getLog(getClass());
    private Templates templates;
    private Map<String, String> parameters = new HashMap<String, String>();

    public AbstractXSLTransformer() {
    }

    @Override
    public Object transform(MuleMessage message, String outputEncoding) throws TransformerException {
        try {
            Transformer transformer = templates.newTransformer();
            for (String name : parameters.keySet())
                transformer.setParameter(name, parameters.get(name));
            StreamSource xmlsource = new StreamSource(new StringReader(message.toString()));
            Writer writer = new StringWriter();
            StreamResult output = new StreamResult(writer);
            transformer.transform(xmlsource, output);
            writer.flush();
            message.setPayload(writer.toString());
            return message;
        } catch (Exception e) {
            throw new TransformerException(this, e);
        }
    }

    protected abstract String getContent(MuleMessage message) throws Exception;

    public void setXslFile(String xslFile) {
        try {
            TransformerFactory factory = TransformerFactory.newInstance();
            templates = factory.newTemplates(new StreamSource(this.getClass().getResourceAsStream(xslFile)));
        } catch (TransformerConfigurationException e) {
            logger.fatal("Error creating transformer using file: " + xslFile, e);
            throw new RuntimeException(e);
        }
    }

    public void setParameters(Map<String, String> parameters) {
        this.parameters = parameters;
    }
}