/*

 * Copyright (c) 2005, 2016, 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.Locale;

import java.util.Objects;

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.Arguments;

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

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

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

import com.sun.tools.javac.jvm.Target;

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

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

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

import com.sun.tools.javac.util.DefinedBy.Api;

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

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

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

/**

 * 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();

    }

    @Override @DefinedBy(Api.COMPILER)

    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.errKey, pw);

        CacheFSInfo.preRegister(context);

        return new JavacFileManager(context, true, charset);

    }

    @Override @DefinedBy(Api.COMPILER)

    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);

    }

    /* Internal version of getTask, allowing context to be provided. */

    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);

            if (options != null) {

                for (String option : options)

                    Objects.requireNonNull(option);

            }

            if (classes != null) {

                for (String cls : classes) {

                    int sep = cls.indexOf('/'); // implicit null check

                    if (sep > 0) {

                        String mod = cls.substring(0, sep);

                        if (!SourceVersion.isName(mod))

                            throw new IllegalArgumentException("Not a valid module name: " + mod);

                        cls = cls.substring(sep + 1);

                    }

                    if (!SourceVersion.isName(cls))

                        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) {

                        String kindMsg = "Compilation unit is not of SOURCE kind: "

                                + "\"" + cu.getName() + "\"";

                        throw new IllegalArgumentException(kindMsg);

                    }

                }

            }

            if (diagnosticListener != null)

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

            if (out == null)

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

            else

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

            if (fileManager == null) {

                fileManager = getStandardFileManager(diagnosticListener, null, null);

                if (fileManager instanceof BaseFileManager) {

                    ((BaseFileManager) fileManager).autoClose = true;

                }

            }

            fileManager = ccw.wrap(fileManager);

            context.put(JavaFileManager.class, fileManager);

            Arguments args = Arguments.instance(context);

            args.init("javac", options, classes, compilationUnits);

            // init multi-release jar handling

                Target target = Target.instance(context);

                List<String> list = List.of(target.multiReleaseValue());

            }

            return new JavacTaskImpl(context);

        } catch (PropagatedException ex) {

            throw ex.getCause();

        } catch (ClientCodeException ex) {

            throw new RuntimeException(ex.getCause());

        }

    }

    @Override @DefinedBy(Api.COMPILER)

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

        if (err == null)

            err = System.err;

        for (String argument : arguments)

            Objects.requireNonNull(argument);

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

    }

    @Override @DefinedBy(Api.COMPILER)

    public Set<SourceVersion> getSourceVersions() {

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

                                                         SourceVersion.latest()));

    }

    @Override @DefinedBy(Api.COMPILER)

    public int isSupportedOption(String option) {

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

        for (Option o : recognizedOptions) {

                return o.hasArg() ? 1 : 0;

        }

        return -1;

    }

}