/*

 * Copyright (c) 2001, 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 jdk.javadoc.internal.tool;

import java.util.EnumSet;

import javax.tools.JavaFileObject;

import com.sun.tools.javac.api.JavacTrees;

import com.sun.tools.javac.code.Symbol.PackageSymbol;

import com.sun.tools.javac.code.ClassFinder;

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

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

/** Javadoc uses an extended class finder that records package.html entries

 *

 *  <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>

 *

 *  @author Neal Gafter

 */

public class JavadocClassFinder extends ClassFinder {

    public static JavadocClassFinder instance(Context context) {

        ClassFinder instance = context.get(classFinderKey);

        if (instance == null)

            instance = new JavadocClassFinder(context);

        return (JavadocClassFinder)instance;

    }

    public static void preRegister(Context context) {

        context.put(classFinderKey, (Factory<ClassFinder>)JavadocClassFinder::new);

    }

    private ToolEnvironment toolEnv;

    private EnumSet<JavaFileObject.Kind> all = EnumSet.of(JavaFileObject.Kind.CLASS,

                                                          JavaFileObject.Kind.SOURCE,

                                                          JavaFileObject.Kind.HTML);

    private EnumSet<JavaFileObject.Kind> noSource = EnumSet.of(JavaFileObject.Kind.CLASS,

                                                               JavaFileObject.Kind.HTML);

    private JavacTrees jctrees;

    private final JavacTrees trees;

    public JavadocClassFinder(Context context) {

        super(context);

        toolEnv = ToolEnvironment.instance(context);

        preferSource = true;

        trees = JavacTrees.instance(context);

    }

    /**

     * Override getPackageFileKinds to include search for package.html

     */

    @Override

    protected EnumSet<JavaFileObject.Kind> getPackageFileKinds() {

        return toolEnv.docClasses ? noSource : all;

    }

    /**

     * Override extraFileActions to check for package documentation

     */

    @Override

    protected void extraFileActions(PackageSymbol pack, JavaFileObject fo) {

        if (fo.isNameCompatible("package", JavaFileObject.Kind.HTML)) {

            pack.sourcefile = fo;

        }

    }

}