com.jaromin.alfresco.repo.content.transform.ZipFormatContentTransformer.java Source code

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Here is the source code for com.jaromin.alfresco.repo.content.transform.ZipFormatContentTransformer.java

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/**
 * Copyright 2012 Patrick Jaromin
 *
 * 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 com.jaromin.alfresco.repo.content.transform;

import java.io.IOException;
import java.io.OutputStream;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

import org.alfresco.repo.content.transform.AbstractContentTransformer2;
import org.alfresco.service.cmr.repository.ContentReader;
import org.alfresco.service.cmr.repository.ContentWriter;
import org.alfresco.service.cmr.repository.TransformationOptions;
import org.apache.commons.io.IOUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * 
 * @author pjaromin
 *
 */
public class ZipFormatContentTransformer extends AbstractContentTransformer2 {

    /*
     * (non-Javadoc)
     * @see org.alfresco.repo.content.transform.AbstractContentTransformerLimits#isTransformable(java.lang.String, java.lang.String, org.alfresco.service.cmr.repository.TransformationOptions)
     */
    @Override
    public boolean isTransformable(String sourceMimetype, String targetMimetype, TransformationOptions options) {
        // Best we can really do at this point is check if the source is a ZIP.
        // Narrow down in a sub-class if necessary.
        return "application/zip".equals(sourceMimetype) || "application/x-zip-compressed".equals(sourceMimetype);
    }

    private String zipEntryPath;

    @Override
    protected void transformInternal(ContentReader reader, ContentWriter writer, TransformationOptions options)
            throws Exception {

        ZipInputStream zip = new ZipInputStream(reader.getContentInputStream());
        OutputStream out = writer.getContentOutputStream();
        try {
            extractEntry(this.getZipEntryPath(), zip, out);
        } finally {
            // Close the streams...
            IOUtils.closeQuietly(zip);
            IOUtils.closeQuietly(out);
        }

    }

    /**
     * 
     * @param path
     * @param zip
     * @param out
     * @throws IOException
     */
    protected void extractEntry(String path, ZipInputStream zip, OutputStream out) throws IOException {

        // Use as regex for more flexibility...
        Pattern p = Pattern.compile(path);

        ZipEntry entry = null;
        while ((entry = zip.getNextEntry()) != null) {
            Matcher m = p.matcher(entry.getName());
            if (m.matches()) {
                IOUtils.copy(zip, out);
                zip.closeEntry();
                break;
            }
        }
    }

    public String getZipEntryPath() {
        return this.zipEntryPath;
    }

    public void setZipEntryPath(String zipEntryPath) {
        this.zipEntryPath = zipEntryPath;
    }

    protected Log log() {
        return LogFactory.getLog(getClass());
    }
}