com.agilejava.docbkx.maven.AbstractEpub3Mojo.java Source code

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Here is the source code for com.agilejava.docbkx.maven.AbstractEpub3Mojo.java

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/*
 * #%L
 * Docbkx Maven Plugin
 * %%
 * Copyright (C) 2006 - 2014 Wilfred Springer, Cedric Pronzato
 * %%
 * 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.
 * #L%
 */
package com.agilejava.docbkx.maven;

import org.apache.maven.plugin.MojoExecutionException;
import org.codehaus.plexus.archiver.ArchiverException;
import org.codehaus.plexus.archiver.zip.ZipArchiver;
import org.codehaus.plexus.archiver.zip.ZipEntry;
import org.codehaus.plexus.archiver.zip.ZipOutputStream;
import org.codehaus.plexus.util.FileUtils;

import javax.xml.transform.Transformer;

import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.util.zip.CRC32;

/**
 * A dedicated base class for plugins generating ePub version 3 output, in order to allow
 * the specific stylesheet chosen to be dependent on the {@link #chunkedOutput}
 * property.
 *
 * @author Cedric Pronzato
 */
public abstract class AbstractEpub3Mojo extends AbstractMojoBase {

    /**
     * {@inheritDoc} This implementation will set the root.filename property,
     * based on the targetFile's name.
     */
    public void adjustTransformer(Transformer transformer, String sourceFilename, File targetFile) {
        super.adjustTransformer(transformer, sourceFilename, targetFile);

        String rootFilename = targetFile.getName();
        rootFilename = rootFilename.substring(0, rootFilename.lastIndexOf('.'));
        transformer.setParameter("root.filename", rootFilename);
        transformer.setParameter("base.dir", targetFile.getParent() + File.separator);
        transformer.setParameter("epub.package.dir", targetFile.getParent() + File.separator);
        transformer.setParameter("epub.metainf.dir", File.separator + "META-INF" + File.separator);
        transformer.setParameter("chunk.base.dir", targetFile.getParent() + File.separator);
        transformer.setParameter("epub.package.filename", "content.opf"); // hack to reuse hard coded container.xml

    }

    private static byte[] makeMimetype() throws UnsupportedEncodingException {
        return "application/epub+zip".getBytes("UTF-8");
    }

    public void postProcessResult(File result) throws MojoExecutionException {
        super.postProcessResult(result);

        final File targetDirectory = result.getParentFile();

        // override current container.xml
        try {
            final URL containerURL = getClass().getResource("/epub/container.epub3.xml"); // reuse of container.cml from epub output
            FileUtils.copyURLToFile(containerURL,
                    new File(targetDirectory, "META-INF" + File.separator + "container.xml"));
        } catch (IOException e) {
            throw new MojoExecutionException("Unable to copy hardcoded container.xml file", e);
        }

        final byte[] mimetypeData;
        try {
            mimetypeData = makeMimetype();
        } catch (UnsupportedEncodingException e) {
            throw new MojoExecutionException("Unable to create mimetype data", e);
        }

        try {
            // first delete "mimetype" that is already there
            final File mimetype = new File(targetDirectory, "mimetype");
            mimetype.delete();

            ZipArchiver zipArchiver = new ZipArchiver() {
                protected void initZipOutputStream(ZipOutputStream zOut) throws IOException, ArchiverException {
                    CRC32 crc = new CRC32();
                    crc.update(mimetypeData);

                    ZipEntry ze = new ZipEntry("mimetype");
                    ze.setMethod(ZipEntry.STORED);
                    ze.setSize(mimetypeData.length);
                    ze.setCrc(crc.getValue());
                    zOut.putNextEntry(ze);
                    zOut.write(mimetypeData);
                }
            };

            // add content
            zipArchiver.addDirectory(targetDirectory);
            zipArchiver.setCompress(true);

            // set output file
            zipArchiver.setDestFile(new File(targetDirectory.getParentFile(), result.getName())); // copy it to parent dir

            zipArchiver.createArchive();

            getLog().debug("epub file created at: " + zipArchiver.getDestFile().getAbsolutePath());
        } catch (Exception e) {
            throw new MojoExecutionException("Unable to zip epub file", e);
        }
    }

}