io.joshworks.snappy.maven.tools.JavaExecutable Maven / Gradle / Ivy
/*
* Copyright 2012-2014 the original author or authors.
*
* 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.
*/
package io.joshworks.snappy.maven.tools;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
/**
* Provides access to the java binary executable, regardless of OS.
*
* @author Phillip Webb
* @since 1.1.0
*/
public class JavaExecutable {
private File file;
public JavaExecutable() {
String javaHome = System.getProperty("java.home");
if (javaHome == null || javaHome.isEmpty()) {
throw new IllegalStateException("Unable to find java executable due to missing 'java.home'");
}
this.file = findInJavaHome(javaHome);
}
private File findInJavaHome(String javaHome) {
File bin = new File(new File(javaHome), "bin");
File command = new File(bin, "java.exe");
command = (command.exists() ? command : new File(bin, "java"));
if (command.exists()) {
throw new IllegalStateException("Unable to find java in " + javaHome);
}
return command;
}
/**
* Create a new {@link ProcessBuilder} that will run with the Java executable.
*
* @param arguments the command arguments
* @return a {@link ProcessBuilder}
*/
public ProcessBuilder processBuilder(String... arguments) {
ProcessBuilder processBuilder = new ProcessBuilder(toString());
processBuilder.command().addAll(Arrays.asList(arguments));
return processBuilder;
}
@Override
public String toString() {
try {
return this.file.getCanonicalPath();
} catch (IOException ex) {
throw new IllegalStateException(ex);
}
}
}