Exporters.DocxService.java Source code

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Here is the source code for Exporters.DocxService.java

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/* 
 * Copyright 2015 cornerpirate.
 *
 * 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 Exporters;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Iterator;
import java.util.List;
import org.apache.commons.io.IOUtils;
import org.docx4j.jaxb.Context;
import org.docx4j.openpackaging.contenttype.ContentType;
import org.docx4j.openpackaging.exceptions.Docx4JException;
import org.docx4j.openpackaging.packages.WordprocessingMLPackage;
import org.docx4j.openpackaging.parts.PartName;
import org.docx4j.openpackaging.parts.WordprocessingML.AlternativeFormatInputPart;
import org.docx4j.openpackaging.parts.WordprocessingML.MainDocumentPart;
import org.docx4j.relationships.Relationship;
import org.docx4j.wml.CTAltChunk;

/**
 *
 * @author cornerpirate
 */
public class DocxService {

    private static final String CONTENT_TYPE = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";

    public InputStream mergeDocx(final List<InputStream> streams) throws Docx4JException, IOException {

        WordprocessingMLPackage target = null;
        final File generated = File.createTempFile("generated", ".docx");

        int chunkId = 0;
        Iterator<InputStream> it = streams.iterator();
        while (it.hasNext()) {
            InputStream is = it.next();
            if (is != null) {
                if (target == null) {
                    // Copy first (master) document
                    OutputStream os = new FileOutputStream(generated);
                    os.write(IOUtils.toByteArray(is));
                    os.close();

                    target = WordprocessingMLPackage.load(generated);
                } else {
                    // Attach the others (Alternative input parts)
                    insertDocx(target.getMainDocumentPart(), IOUtils.toByteArray(is), chunkId++);
                }
            }
        }

        if (target != null) {
            target.save(generated);
            return new FileInputStream(generated);
        } else {
            return null;
        }
    }

    private static void insertDocx(MainDocumentPart main, byte[] bytes, int chunkId) {
        try {
            AlternativeFormatInputPart afiPart = new AlternativeFormatInputPart(
                    new PartName("/part" + chunkId + ".docx"));
            afiPart.setContentType(new ContentType(CONTENT_TYPE));
            afiPart.setBinaryData(bytes);
            Relationship altChunkRel = main.addTargetPart(afiPart);

            CTAltChunk chunk = Context.getWmlObjectFactory().createCTAltChunk();
            chunk.setId(altChunkRel.getId());

            main.addObject(chunk);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}