org.kuali.maven.plugins.jenkins.helper.JavaHelper Maven / Gradle / Ivy

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Automated management of Jenkins jobs via Maven. Much of the information needed by Jenkins when creating a job is already in the Maven pom. The SCM information and CI url are present there. Jenkins jobs also typically have names that reflect the groupId, artifactId, and version in some manner. This plugin automates the process of creating Jenkins jobs by harvesting information from the POM to create XML config files in the format Jenkins needs. The Jenkins CLI wrapper is then used to create, update, read, and delete Jenkins jobs on the CI server.

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/**
 * Copyright 2011-2012 The Kuali Foundation
 *
 * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
 *
 * 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 org.kuali.maven.plugins.jenkins.helper;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang.StringUtils;
import org.kuali.maven.plugins.jenkins.context.ProcessResult;

public class JavaHelper {
    ProcessHelper helper = new ProcessHelper();

    public static final String FS = System.getProperty("file.separator");
    public static final String JAVA_HOME_KEY = "java.home";
    public static final String BIN = "bin";
    public static final String JAVA = "java";
    public static final String[] EXECUTABLES = { JAVA, "javaw" };
    public static final String[] EXTENSIONS = { "", ".exe" };
    public static final String EXECUTE_JAR_ARG = "-jar";

    public ProcessResult executeJar(File jar, String... args) {
        return executeJar(jar, args, null);
    }

    public ProcessResult executeJar(File jar, String[] args, String input) {
        String executable = getExecutable();
        String[] jarArgs = getExecuteJarArgs(jar, args);
        return helper.execute(executable, jarArgs, input);
    }

    /**
     * Locate the full path to the java executable being used by the currently running JVM or just return "java" if
     * unable to locate it
     */
    public String getExecutable() {
        return getExecutable(EXECUTABLES, EXTENSIONS);
    }

    public String getExecutable(String[] executables, String[] extensions) {
        List paths = getPotentialPaths(executables, extensions);
        for (String path : paths) {
            if (isUsable(path)) {
                return path;
            }
        }
        return JAVA;
    }

    protected String[] getExecuteJarArgs(File jar, String... args) {
        List list = new ArrayList();
        list.add(EXECUTE_JAR_ARG);
        list.add(jar.getAbsolutePath());
        Helper.addToList(list, args);
        return list.toArray(new String[list.size()]);
    }

    protected boolean isUsable(String path) {
        File file = new File(path);
        return file.exists() && file.canExecute();
    }

    protected List getPotentialPaths(String[] executables, String[] extensions) {
        String javaHome = System.getProperty(JAVA_HOME_KEY);
        if (StringUtils.isBlank(javaHome)) {
            return new ArrayList();
        }
        if (!javaHome.endsWith(FS)) {
            javaHome += FS;
        }
        String dir = javaHome + BIN + FS;
        List paths = new ArrayList();
        for (String executable : executables) {
            for (String extension : extensions) {
                String path = dir + executable + extension;
                paths.add(path);
            }
        }
        return paths;
    }
}