org.pentaho.di.trans.steps.xslt.XsltData.java Source code

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/*! ******************************************************************************
 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2013 by Pentaho : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * 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.pentaho.di.trans.steps.xslt;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Properties;

import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamSource;

import org.apache.commons.vfs.FileObject;
import org.pentaho.di.core.row.RowMetaInterface;
import org.pentaho.di.core.vfs.KettleVFS;
import org.pentaho.di.trans.step.BaseStepData;
import org.pentaho.di.trans.step.StepDataInterface;

/**
 * @author Samatar
 * @since 24-jan-2005
 *
 */
public class XsltData extends BaseStepData implements StepDataInterface {

    public RowMetaInterface outputRowMeta;
    public int fieldposition;
    public int fielxslfiledposition;
    public String xslfilename;

    public int[] fields_used;

    public TransformerFactory factory;
    public HashMap<String, Transformer> transformers;

    public int nrParams;
    public int[] indexOfParams;
    public String[] nameOfParams;
    public boolean useParameters;

    public Properties outputProperties;
    public boolean setOutputProperties;
    public boolean xslIsAfile;

    public XsltData() {
        super();
        fieldposition = -1;
        fielxslfiledposition = -1;
        xslfilename = null;
        transformers = new HashMap<String, Transformer>();
        useParameters = false;
        nrParams = 0;
        setOutputProperties = false;
    }

    public Transformer getTemplate(String xslFilename, boolean isAfile) throws Exception {
        Transformer template = transformers.get(xslFilename);
        if (template != null) {
            template.clearParameters();
            return template;
        }

        return createNewTemplate(xslFilename, isAfile);
    }

    private Transformer createNewTemplate(String xslSource, boolean isAfile) throws Exception {
        FileObject file = null;
        InputStream xslInputStream = null;
        Transformer transformer = null;
        try {
            if (isAfile) {
                file = KettleVFS.getFileObject(xslSource);
                xslInputStream = KettleVFS.getInputStream(file);
            } else {
                xslInputStream = new ByteArrayInputStream(xslSource.getBytes("UTF-8"));
            }

            // Use the factory to create a template containing the xsl source
            transformer = factory.newTransformer(new StreamSource(xslInputStream));
            // Add transformer to cache
            transformers.put(xslSource, transformer);

            return transformer;
        } finally {
            try {
                if (file != null) {
                    file.close();
                }
                if (xslInputStream != null) {
                    xslInputStream.close();
                }
            } catch (Exception e) { /* Ignore */
            }
        }
    }

    public void dispose() {
        transformers = null;
        factory = null;
        outputRowMeta = null;
        outputProperties = null;
    }
}