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Ant example source code file (CompilerAdapterFactory.java)

This example Ant source code file (CompilerAdapterFactory.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Ant tags/keywords

buildexception, buildexception, classloader, classnotfoundexception, compileradapter, compileradapter, compileradapterfactory, compileradapterfactory, gcj, javac12, javac12, jvc, modern_compiler, sj

The CompilerAdapterFactory.java source code

/*
 *  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.tools.ant.taskdefs.compilers;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.util.ClasspathUtils;
import org.apache.tools.ant.util.JavaEnvUtils;

/**
 * Creates the necessary compiler adapter, given basic criteria.
 *
 * @since Ant 1.3
 */
public final class CompilerAdapterFactory {
    private static final String MODERN_COMPILER = "com.sun.tools.javac.Main";

    /** This is a singleton -- can't create instances!! */
    private CompilerAdapterFactory() {
    }

    /**
     * Based on the parameter passed in, this method creates the necessary
     * factory desired.
     *
     * The current mapping for compiler names are as follows:
     * <ul>
  • jikes = jikes compiler * <li>classic, javac1.1, javac1.2 = the standard compiler from JDK * 1.1/1.2 * <li>modern, javac1.3, javac1.4, javac1.5 = the compiler of JDK 1.3+ * <li>jvc, microsoft = the command line compiler from Microsoft's SDK * for Java / Visual J++ * <li>kjc = the kopi compiler
  • * <li>gcj = the gcj compiler from gcc * <li>sj, symantec = the Symantec Java compiler * <li>a fully qualified classname = the name of a compiler * adapter * </ul> * * @param compilerType either the name of the desired compiler, or the * full classname of the compiler's adapter. * @param task a task to log through. * @return the compiler adapter * @throws BuildException if the compiler type could not be resolved into * a compiler adapter. */ public static CompilerAdapter getCompiler(String compilerType, Task task) throws BuildException { boolean isClassicCompilerSupported = true; //as new versions of java come out, add them to this test if (!JavaEnvUtils.isJavaVersion(JavaEnvUtils.JAVA_1_2) && !JavaEnvUtils.isJavaVersion(JavaEnvUtils.JAVA_1_3)) { isClassicCompilerSupported = false; } if (compilerType.equalsIgnoreCase("jikes")) { return new Jikes(); } if (compilerType.equalsIgnoreCase("extJavac")) { return new JavacExternal(); } if (compilerType.equalsIgnoreCase("classic") || compilerType.equalsIgnoreCase("javac1.1") || compilerType.equalsIgnoreCase("javac1.2")) { if (isClassicCompilerSupported) { return new Javac12(); } else { task.log("This version of java does " + "not support the classic " + "compiler; upgrading to modern", Project.MSG_WARN); compilerType = "modern"; } } //on java<=1.3 the modern falls back to classic if it is not found //but on java>=1.4 we just bail out early if (compilerType.equalsIgnoreCase("modern") || compilerType.equalsIgnoreCase("javac1.3") || compilerType.equalsIgnoreCase("javac1.4") || compilerType.equalsIgnoreCase("javac1.5") || compilerType.equalsIgnoreCase("javac1.6")) { // does the modern compiler exist? if (doesModernCompilerExist()) { return new Javac13(); } else { if (isClassicCompilerSupported) { task.log("Modern compiler not found - looking for " + "classic compiler", Project.MSG_WARN); return new Javac12(); } else { throw new BuildException("Unable to find a javac " + "compiler;\n" + MODERN_COMPILER + " is not on the " + "classpath.\n" + "Perhaps JAVA_HOME does not" + " point to the JDK.\n" + "It is currently set to \"" + JavaEnvUtils.getJavaHome() + "\""); } } } if (compilerType.equalsIgnoreCase("jvc") || compilerType.equalsIgnoreCase("microsoft")) { return new Jvc(); } if (compilerType.equalsIgnoreCase("kjc")) { return new Kjc(); } if (compilerType.equalsIgnoreCase("gcj")) { return new Gcj(); } if (compilerType.equalsIgnoreCase("sj") || compilerType.equalsIgnoreCase("symantec")) { return new Sj(); } return resolveClassName(compilerType); } /** * query for the Modern compiler existing * @return true if classic os on the classpath */ private static boolean doesModernCompilerExist() { try { Class.forName(MODERN_COMPILER); return true; } catch (ClassNotFoundException cnfe) { try { ClassLoader cl = CompilerAdapterFactory.class.getClassLoader(); if (cl != null) { cl.loadClass(MODERN_COMPILER); return true; } } catch (ClassNotFoundException cnfe2) { // Ignore Exception } } return false; } /** * Tries to resolve the given classname into a compiler adapter. * Throws a fit if it can't. * * @param className The fully qualified classname to be created. * @throws BuildException This is the fit that is thrown if className * isn't an instance of CompilerAdapter. */ private static CompilerAdapter resolveClassName(String className) throws BuildException { return (CompilerAdapter) ClasspathUtils.newInstance(className, CompilerAdapterFactory.class.getClassLoader(), CompilerAdapter.class); } }

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