/*
 * 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
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.
Author:
Peter von der Ah\u00e9/**
 * 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 create or the service provider mechanism. 
See Also:
JavaCompiler
ToolProvider
create/**
     * 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() {}

    // @Override // can't add @Override until bootstrap JDK provides Tool.name()
    @DefinedBy(Api.COMPILER)
    public String name() {
        return "javac";
    }

    
Static factory method for creating new instances of this tool.
Returns:
new instance of this tool/**
     * 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
            if (fileManager.isSupportedOption(Option.MULTIRELEASE.primaryName) == 1) {
                Target target = Target.instance(context);
                List<String> list = List.of(target.multiReleaseValue());
                fileManager.handleOption(Option.MULTIRELEASE.primaryName, list.iterator());
            }

            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) {
            if (o.matches(option)) {
                return o.hasArg() ? 1 : 0;
            }
        }
        return -1;
    }

}