de.taimos.daemon.plugin.AbstractJarHeaderMojo.java Source code

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Here is the source code for de.taimos.daemon.plugin.AbstractJarHeaderMojo.java

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package de.taimos.daemon.plugin;

/*
 * #%L
 * Maven plugin for daemon framework
 * %%
 * Copyright (C) 2015 Taimos GmbH
 * %%
 * 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%
 */

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import org.apache.commons.io.IOUtils;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugins.annotations.Parameter;

public abstract class AbstractJarHeaderMojo extends AbstractMojo {

    /**
     * jar file full name
     */
    @Parameter(defaultValue = "${project.build.directory}/${project.build.finalName}.jar", property = "artifact", required = true)
    protected String artifact;

    @Override
    public void execute() throws MojoExecutionException, MojoFailureException {
        File artifactFile = new File(this.artifact);
        if (!artifactFile.exists()) {
            throw new MojoExecutionException("artifact does not exist: " + this.artifact);
        }
        File artifactTmpFile = new File(this.artifact + ".tmp");

        try (FileOutputStream fos = new FileOutputStream(artifactTmpFile);
                FileInputStream fis = new FileInputStream(artifactFile)) {
            StringBuilder header = new StringBuilder();
            header.append("#!/bin/bash");
            header.append('\n');
            header.append(this.getCommand());
            header.append('\n');
            header.append("exit");
            header.append('\n');

            fos.write(header.toString().getBytes());
            IOUtils.copy(fis, fos);

            artifactTmpFile.setExecutable(true, false);
        } catch (Exception e) {
            throw new MojoExecutionException("Error writing stream", e);
        }

        artifactFile.delete();
        artifactTmpFile.renameTo(artifactFile);
    }

    protected abstract String getCommand();

}