/*

 * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.tools.javac.api;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.io.Writer;

import java.nio.charset.Charset;

import java.util.Collections;

import java.util.EnumSet;

import java.util.Iterator;

import java.util.Locale;

import java.util.Set;

import javax.lang.model.SourceVersion;

import javax.tools.*;

import com.sun.source.util.JavacTask;

import com.sun.tools.javac.file.JavacFileManager;

import com.sun.tools.javac.main.Main;

import com.sun.tools.javac.main.Option;

import com.sun.tools.javac.main.OptionHelper;

import com.sun.tools.javac.main.OptionHelper.GrumpyHelper;

import com.sun.tools.javac.util.ClientCodeException;

import com.sun.tools.javac.util.Context;

import com.sun.tools.javac.util.Log;

import com.sun.tools.javac.util.Log.PrefixKind;

import com.sun.tools.javac.util.Options;

/**

 * TODO: describe com.sun.tools.javac.api.Tool

 *

 * <p><b>This is NOT part of any supported API.

 * If you write code that depends on this, you do so at your own

 * risk.  This code and its internal interfaces are subject to change

 * or deletion without notice.</b></p>

 *

 * @author Peter von der Ah\u00e9

 */

public final class JavacTool implements JavaCompiler {

    /**

     * Constructor used by service provider mechanism.  The recommended way to

     * obtain an instance of this class is by using {@link #create} or the

     * service provider mechanism.

     * @see javax.tools.JavaCompiler

     * @see javax.tools.ToolProvider

     * @see #create

     */

    @Deprecated

    public JavacTool() {}

    /**

     * Static factory method for creating new instances of this tool.

     * @return new instance of this tool

     */

    public static JavacTool create() {

        return new JavacTool();

    }

    public JavacFileManager getStandardFileManager(

        DiagnosticListener<? super JavaFileObject> diagnosticListener,

        Locale locale,

        Charset charset) {

        Context context = new Context();

        context.put(Locale.class, locale);

        if (diagnosticListener != null)

            context.put(DiagnosticListener.class, diagnosticListener);

        PrintWriter pw = (charset == null)

                ? new PrintWriter(System.err, true)

                : new PrintWriter(new OutputStreamWriter(System.err, charset), true);

        context.put(Log.outKey, pw);

        return new JavacFileManager(context, true, charset);

    }

    @Override

    public JavacTask getTask(Writer out,

                             JavaFileManager fileManager,

                             DiagnosticListener<? super JavaFileObject> diagnosticListener,

                             Iterable<String> options,

                             Iterable<String> classes,

                             Iterable<? extends JavaFileObject> compilationUnits) {

        Context context = new Context();

        return getTask(out, fileManager, diagnosticListener,

                options, classes, compilationUnits,

                context);

    }

    public JavacTask getTask(Writer out,

                             JavaFileManager fileManager,

                             DiagnosticListener<? super JavaFileObject> diagnosticListener,

                             Iterable<String> options,

                             Iterable<String> classes,

                             Iterable<? extends JavaFileObject> compilationUnits,

                             Context context)

    {

        try {

            ClientCodeWrapper ccw = ClientCodeWrapper.instance(context);

            final String kindMsg = "All compilation units must be of SOURCE kind";

            if (options != null)

                for (String option : options)

                    option.getClass(); // null check

            if (classes != null) {

                for (String cls : classes)

                    if (!SourceVersion.isName(cls)) // implicit null check

                        throw new IllegalArgumentException("Not a valid class name: " + cls);

            }

            if (compilationUnits != null) {

                compilationUnits = ccw.wrapJavaFileObjects(compilationUnits); // implicit null check

                for (JavaFileObject cu : compilationUnits) {

                    if (cu.getKind() != JavaFileObject.Kind.SOURCE)

                        throw new IllegalArgumentException(kindMsg);

                }

            }

            if (diagnosticListener != null)

                context.put(DiagnosticListener.class, ccw.wrap(diagnosticListener));

            if (out == null)

                context.put(Log.outKey, new PrintWriter(System.err, true));

            else

                context.put(Log.outKey, new PrintWriter(out, true));

            if (fileManager == null)

                fileManager = getStandardFileManager(diagnosticListener, null, null);

            fileManager = ccw.wrap(fileManager);

            context.put(JavaFileManager.class, fileManager);

            processOptions(context, fileManager, options);

            Main compiler = new Main("javacTask", context.get(Log.outKey));

            return new JavacTaskImpl(compiler, options, context, classes, compilationUnits);

        } catch (ClientCodeException ex) {

            throw new RuntimeException(ex.getCause());

        }

    }

                                       JavaFileManager fileManager,

                                       Iterable<String> options)

    {

        if (options == null)

            return;

        final Options optionTable = Options.instance(context);

        Log log = Log.instance(context);

        Option[] recognizedOptions =

                Option.getJavacToolOptions().toArray(new Option[0]);

        OptionHelper optionHelper = new GrumpyHelper(log) {

            @Override

            public String get(Option option) {

                return optionTable.get(option.getText());

            }

            @Override

            public void put(String name, String value) {

                optionTable.put(name, value);

            }

            @Override

            public void remove(String name) {

                optionTable.remove(name);

            }

        };

        Iterator<String> flags = options.iterator();

        while (flags.hasNext()) {

            String flag = flags.next();

            int j;

            for (j=0; j<recognizedOptions.length; j++)

                if (recognizedOptions[j].matches(flag))

                    break;

            if (j == recognizedOptions.length) {

                if (fileManager.handleOption(flag, flags)) {

                    continue;

                } else {

                    String msg = log.localize(PrefixKind.JAVAC, "err.invalid.flag", flag);

                    throw new IllegalArgumentException(msg);

                }

            }

            Option option = recognizedOptions[j];

            if (option.hasArg()) {

                if (!flags.hasNext()) {

                    String msg = log.localize(PrefixKind.JAVAC, "err.req.arg", flag);

                    throw new IllegalArgumentException(msg);

                }

                String operand = flags.next();

                if (option.process(optionHelper, flag, operand))

                    // should not happen as the GrumpyHelper will throw exceptions

                    // in case of errors

                    throw new IllegalArgumentException(flag + " " + operand);

            } else {

                if (option.process(optionHelper, flag))

                    // should not happen as the GrumpyHelper will throw exceptions

                    // in case of errors

                    throw new IllegalArgumentException(flag);

            }

        }

        optionTable.notifyListeners();

    }

    public int run(InputStream in, OutputStream out, OutputStream err, String... arguments) {

        if (err == null)

            err = System.err;

        for (String argument : arguments)

            argument.getClass(); // null check

        return com.sun.tools.javac.Main.compile(arguments, new PrintWriter(err, true));

    }

    public Set<SourceVersion> getSourceVersions() {

        return Collections.unmodifiableSet(EnumSet.range(SourceVersion.RELEASE_3,

                                                         SourceVersion.latest()));

    }

    public int isSupportedOption(String option) {

        Set<Option> recognizedOptions = Option.getJavacToolOptions();

        for (Option o : recognizedOptions) {

            if (o.matches(option))

                return o.hasArg() ? 1 : 0;

        }

        return -1;

    }

}