net.sourceforge.vulcan.util.JavaCommandBuilder.java Source code

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Here is the source code for net.sourceforge.vulcan.util.JavaCommandBuilder.java

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/*
 * Vulcan Build Manager
 * Copyright (C) 2005-2012 Chris Eldredge
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
package net.sourceforge.vulcan.util;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import net.sourceforge.vulcan.exception.ConfigException;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class JavaCommandBuilder {
    private static final String JAVA_EXECUTABLE_PATH = "bin" + File.separator + "java";
    private static final String EXECUTABLE_EXTENSION = ".exe";

    private final static Log log = LogFactory.getLog(JavaCommandBuilder.class);

    private String javaExecutablePath;
    private String mainClassName;
    private String vmParameters;

    private Map<String, String> systemProperties = new HashMap<String, String>();
    private List<String> classPath = new ArrayList<String>();
    private List<String> arguments = new ArrayList<String>();

    public String[] construct() {
        final List<String> args = new ArrayList<String>();

        args.add(javaExecutablePath);

        if (vmParameters != null) {
            Collections.addAll(args, vmParameters.split(" "));
        }

        if (!classPath.isEmpty()) {
            args.add("-classpath");
            args.add(StringUtils.join(classPath.iterator(), File.pathSeparatorChar));
        }

        for (String property : systemProperties.keySet()) {
            final StringBuilder arg = new StringBuilder("-D");
            arg.append(property);
            arg.append("=");
            arg.append(systemProperties.get(property));

            args.add(arg.toString());
        }

        args.add(mainClassName);

        for (String arg : arguments) {
            args.add(arg);
        }

        return args.toArray(new String[args.size()]);
    }

    public void addClassPathEntry(String path) {
        if (!classPath.contains(path)) {
            classPath.add(path);
        }
    }

    public void addSystemProperty(String key, String value) {
        if (systemProperties.containsKey(key)) {
            log.debug("Overriding system property " + key);
        }
        systemProperties.put(key, value);
    }

    public void addArgument(String arg) {
        arguments.add(arg);
    }

    @Override
    public String toString() {
        return StringUtils.join(construct(), " ");
    }

    @Override
    public boolean equals(Object obj) {
        return EqualsBuilder.reflectionEquals(this, obj);
    }

    @Override
    public int hashCode() {
        return HashCodeBuilder.reflectionHashCode(this);
    }

    public String getJavaExecutablePath() {
        return javaExecutablePath;
    }

    public void setJavaExecutablePath(String javaExecutablePath) {
        this.javaExecutablePath = javaExecutablePath;
    }

    public void setJavaHome(String javaHome) throws ConfigException {
        try {
            final File javaProgram = getVirtualMachineExecutable(javaHome);
            setJavaExecutablePath(javaProgram.getCanonicalPath());
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static File getVirtualMachineExecutable(String javaHome) throws ConfigException {

        File file = new File(javaHome, JAVA_EXECUTABLE_PATH);

        if (!file.exists()) {
            file = new File(javaHome, JAVA_EXECUTABLE_PATH + EXECUTABLE_EXTENSION);

            if (!file.exists()) {
                throw new ConfigException("java.home.invalid", new String[] { JAVA_EXECUTABLE_PATH, javaHome });
            }
        }
        return file;
    }

    public String getMainClassName() {
        return mainClassName;
    }

    public void setMainClassName(String mainClassName) {
        this.mainClassName = mainClassName;
    }

    public List<String> getClassPath() {
        return Collections.unmodifiableList(classPath);
    }

    public String getVmParameters() {
        return vmParameters;
    }

    public void setVmParameters(String vmParameters) {
        this.vmParameters = vmParameters;
    }
}