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

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/**
 * Copyright 2011-2013 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 extends ExecutableHelper {

	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
	 */
	@Override
    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;
	}
}