org.codehaus.mojo.minijar.resource.LicenseHandler.java Source code

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Here is the source code for org.codehaus.mojo.minijar.resource.LicenseHandler.java

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package org.codehaus.mojo.minijar.resource;

/*
 * Copyright 2005 The Apache Software Foundation.
 * 
 * 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.
 */

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;

import org.apache.commons.io.IOUtils;
import org.vafer.dependency.resources.ResourceHandler;
import org.vafer.dependency.resources.Version;
import org.vafer.dependency.utils.Jar;

public final class LicenseHandler implements ResourceHandler {
    private File licensesFile;
    private FileOutputStream licensesOutputStream;

    public void onStartProcessing(JarOutputStream pOutput) throws IOException {
    }

    public void onStartJar(Jar pJar, JarOutputStream pOutput) throws IOException {
    }

    public InputStream onResource(Jar jar, String oldName, String newName, Version[] versions,
            InputStream inputStream) throws IOException {
        final String s = oldName.toLowerCase();

        if ("meta-inf/license.txt".equals(s) || "meta-inf/license".equals(s) || "meta-inf/notice.txt".equals(s)
                || "meta-inf/notice".equals(s)) {
            System.out.println(this + " found resource " + oldName);

            if (licensesFile == null) {
                licensesFile = File.createTempFile("minijar", "license");
                licensesFile.deleteOnExit();
            }

            if (licensesOutputStream == null) {
                licensesOutputStream = new FileOutputStream(licensesFile);
            }

            return new FilterInputStream(inputStream) {

                public int read() throws IOException {
                    int r = super.read();
                    if (r > 0) {
                        licensesOutputStream.write(r);
                    }
                    return r;
                }

                public int read(byte[] b, int off, int len) throws IOException {
                    int r = super.read(b, off, len);
                    if (r > 0) {
                        licensesOutputStream.write(b, off, r);
                    }
                    return r;
                }

                public int read(byte[] b) throws IOException {
                    int r = super.read(b);
                    if (r > 0) {
                        licensesOutputStream.write(b, 0, r);
                    }
                    return r;
                }
            };
        }

        return inputStream;
    }

    public void onStopJar(Jar pJar, JarOutputStream pOutput) throws IOException {
    }

    public void onStopProcessing(JarOutputStream pOutput) throws IOException {
        if (licensesOutputStream == null) {
            // no license information aggregated
            return;
        }

        IOUtils.closeQuietly(licensesOutputStream);

        // insert aggregated license information into new jar

        final FileInputStream licensesInputStream = new FileInputStream(licensesFile);

        pOutput.putNextEntry(new JarEntry("LICENSE.txt"));

        IOUtils.copy(licensesInputStream, pOutput);

        IOUtils.closeQuietly(licensesInputStream);

    }

}