/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
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 *    distribution.
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 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
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 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
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 * information on the Apache Software Foundation, please see
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 */

package org.apache.tools.ant.taskdefs.compilers;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.Project;

/**
 * Creates the necessary compiler adapter, given basic criteria.
 *
 * @author <a href="mailto:jayglanville@home.com">J D Glanville</a>
 */
public class CompilerAdapterFactory {

    /** This is a singlton -- 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><li>jikes = jikes compiler
     * <li>classic, javac1.1, javac1.2 = the standard compiler from JDK
     * 1.1/1.2
     * <li>modern, javac1.3 = the new compiler of JDK 1.3
     * <li>jvc, microsoft = the command line compiler from Microsoft's SDK
     * for Java / Visual J++
     * <li><i>a fully quallified classname</i> = 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.
     * @throws BuildException if the compiler type could not be resolved into
     * a compiler adapter.
     */
    public static CompilerAdapter getCompiler( String compilerType, Task task ) 
        throws BuildException {
            /* If I've done things right, this should be the extent of the
             * conditional statements required.
             */
            if ( compilerType.equalsIgnoreCase("jikes") ) {
                return new Jikes();
            }
            if ( compilerType.equalsIgnoreCase("classic") ||
                    compilerType.equalsIgnoreCase("javac1.1") ||
                    compilerType.equalsIgnoreCase("javac1.2")) {
                return new Javac12();
            }
            if ( compilerType.equalsIgnoreCase("modern") ||
                    compilerType.equalsIgnoreCase("javac1.3")) {
                // does the modern compiler exist?
                try {
                    Class.forName("com.sun.tools.javac.Main");
                } catch (ClassNotFoundException cnfe) {
                    task.log("Modern compiler is not available - using "
                            + "classic compiler", Project.MSG_WARN);
                    return new Javac12();
                }
                return new Javac13();
            }
            if ( compilerType.equalsIgnoreCase("jvc") ||
                    compilerType.equalsIgnoreCase("microsoft")) {
                return new Jvc();
            }
            return resolveClassName( compilerType );
        }

    /**
     * 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 {
        try {
            Class c = Class.forName( className );
            Object o = c.newInstance();
            return (CompilerAdapter) o;
        } catch ( ClassNotFoundException cnfe ) {
            throw new BuildException( className + " can't be found.", cnfe );
        } catch ( ClassCastException cce ) {
            throw new BuildException(className + " insn't the classname of "
                    + "a compiler adapter.", cce);
        } catch ( Throwable t ) {
            // for all other possibilities
            throw new BuildException(className + " caused an interesting "
                    + "exception.", t);
        }
    }

}