Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 org.apache.commons.jci.examples.commandline; import java.io.File; import java.net.URL; import java.net.URLClassLoader; import java.util.Iterator; import org.apache.commons.cli.CommandLine; import org.apache.commons.cli.CommandLineParser; import org.apache.commons.cli.GnuParser; import org.apache.commons.cli.Option; import org.apache.commons.cli.OptionBuilder; import org.apache.commons.cli.Options; import org.apache.commons.jci.compilers.CompilationResult; import org.apache.commons.jci.compilers.JavaCompiler; import org.apache.commons.jci.compilers.JavaCompilerFactory; import org.apache.commons.jci.compilers.JavaCompilerSettings; import org.apache.commons.jci.problems.CompilationProblem; import org.apache.commons.jci.problems.CompilationProblemHandler; import org.apache.commons.jci.readers.FileResourceReader; import org.apache.commons.jci.readers.ResourceReader; import org.apache.commons.jci.stores.FileResourceStore; import org.apache.commons.jci.stores.ResourceStore; /** * A simple front end to jci mimicking the javac command line * * @author tcurdt */ public final class CommandlineCompiler { public static void main(String[] args) throws Exception { final Options options = new Options(); options.addOption(OptionBuilder.withArgName("a.jar:b.jar").hasArg().withValueSeparator(':') .withDescription("Specify where to find user class files").create("classpath")); options.addOption(OptionBuilder.withArgName("release").hasArg() .withDescription("Provide source compatibility with specified release").create("source")); options.addOption(OptionBuilder.withArgName("release").hasArg() .withDescription("Generate class files for specific VM version").create("target")); options.addOption(OptionBuilder.withArgName("path").hasArg() .withDescription("Specify where to find input source files").create("sourcepath")); options.addOption(OptionBuilder.withArgName("directory").hasArg() .withDescription("Specify where to place generated class files").create("d")); options.addOption(OptionBuilder.withArgName("num").hasArg() .withDescription("Stop compilation after these number of errors").create("Xmaxerrs")); options.addOption(OptionBuilder.withArgName("num").hasArg() .withDescription("Stop compilation after these number of warning").create("Xmaxwarns")); options.addOption(OptionBuilder.withDescription("Generate no warnings").create("nowarn")); // final HelpFormatter formatter = new HelpFormatter(); // formatter.printHelp("jci", options); final CommandLineParser parser = new GnuParser(); final CommandLine cmd = parser.parse(options, args, true); ClassLoader classloader = CommandlineCompiler.class.getClassLoader(); File sourcepath = new File("."); File targetpath = new File("."); int maxerrs = 10; int maxwarns = 10; final boolean nowarn = cmd.hasOption("nowarn"); final JavaCompiler compiler = new JavaCompilerFactory().createCompiler("eclipse"); final JavaCompilerSettings settings = compiler.createDefaultSettings(); for (Iterator it = cmd.iterator(); it.hasNext();) { final Option option = (Option) it.next(); if ("classpath".equals(option.getOpt())) { final String[] values = option.getValues(); final URL[] urls = new URL[values.length]; for (int i = 0; i < urls.length; i++) { urls[i] = new File(values[i]).toURL(); } classloader = new URLClassLoader(urls); } else if ("source".equals(option.getOpt())) { settings.setSourceVersion(option.getValue()); } else if ("target".equals(option.getOpt())) { settings.setTargetVersion(option.getValue()); } else if ("sourcepath".equals(option.getOpt())) { sourcepath = new File(option.getValue()); } else if ("d".equals(option.getOpt())) { targetpath = new File(option.getValue()); } else if ("Xmaxerrs".equals(option.getOpt())) { maxerrs = Integer.parseInt(option.getValue()); } else if ("Xmaxwarns".equals(option.getOpt())) { maxwarns = Integer.parseInt(option.getValue()); } } final ResourceReader reader = new FileResourceReader(sourcepath); final ResourceStore store = new FileResourceStore(targetpath); final int maxErrors = maxerrs; final int maxWarnings = maxwarns; compiler.setCompilationProblemHandler(new CompilationProblemHandler() { int errors = 0; int warnings = 0; public boolean handle(final CompilationProblem pProblem) { if (pProblem.isError()) { System.err.println(pProblem); errors++; if (errors >= maxErrors) { return false; } } else { if (!nowarn) { System.err.println(pProblem); } warnings++; if (warnings >= maxWarnings) { return false; } } return true; } }); final String[] resource = cmd.getArgs(); for (int i = 0; i < resource.length; i++) { System.out.println("compiling " + resource[i]); } final CompilationResult result = compiler.compile(resource, reader, store, classloader); System.out.println(result.getErrors().length + " errors"); System.out.println(result.getWarnings().length + " warnings"); } }