/*

 * Copyright (c) 2009, 2013, 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.javap;

import com.sun.tools.classfile.Attribute;

import com.sun.tools.classfile.Code_attribute;

import com.sun.tools.classfile.TypeAnnotation;

import com.sun.tools.classfile.TypeAnnotation.Position;

import com.sun.tools.classfile.Instruction;

import com.sun.tools.classfile.Method;

import com.sun.tools.classfile.RuntimeInvisibleTypeAnnotations_attribute;

import com.sun.tools.classfile.RuntimeTypeAnnotations_attribute;

import com.sun.tools.classfile.RuntimeVisibleTypeAnnotations_attribute;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

/**

 * Annotate instructions with details about type annotations.

 *

 *  <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>

 */

public class TypeAnnotationWriter extends InstructionDetailWriter {

    public enum NoteKind { VISIBLE, INVISIBLE };

    public static class Note {

        Note(NoteKind kind, TypeAnnotation anno) {

            this.kind = kind;

            this.anno = anno;

        }

        public final NoteKind kind;

        public final TypeAnnotation anno;

    }

    static TypeAnnotationWriter instance(Context context) {

        TypeAnnotationWriter instance = context.get(TypeAnnotationWriter.class);

        if (instance == null)

            instance = new TypeAnnotationWriter(context);

        return instance;

    }

    protected TypeAnnotationWriter(Context context) {

        super(context);

        context.put(TypeAnnotationWriter.class, this);

        annotationWriter = AnnotationWriter.instance(context);

        classWriter = ClassWriter.instance(context);

    }

    public void reset(Code_attribute attr) {

        Method m = classWriter.getMethod();

        pcMap = new HashMap<Integer, List<Note>>();

        check(NoteKind.VISIBLE, (RuntimeVisibleTypeAnnotations_attribute) m.attributes.get(Attribute.RuntimeVisibleTypeAnnotations));

        check(NoteKind.INVISIBLE, (RuntimeInvisibleTypeAnnotations_attribute) m.attributes.get(Attribute.RuntimeInvisibleTypeAnnotations));

    }

    private void check(NoteKind kind, RuntimeTypeAnnotations_attribute attr) {

        if (attr == null)

            return;

        for (TypeAnnotation anno: attr.annotations) {

            Position p = anno.position;

            Note note = null;

            if (p.offset != -1)

                addNote(p.offset, note = new Note(kind, anno));

            if (p.lvarOffset != null) {

                for (int i = 0; i < p.lvarOffset.length; i++) {

                    if (note == null)

                        note = new Note(kind, anno);

                    addNote(p.lvarOffset[i], note);

                }

            }

        }

    }

    private void addNote(int pc, Note note) {

        List<Note> list = pcMap.get(pc);

        if (list == null)

            pcMap.put(pc, list = new ArrayList<Note>());

        list.add(note);

    }

    @Override

    void writeDetails(Instruction instr) {

        String indent = space(2); // get from Options?

        int pc = instr.getPC();

        List<Note> notes = pcMap.get(pc);

        if (notes != null) {

            for (Note n: notes) {

                print(indent);

                print("@");

                annotationWriter.write(n.anno, false, true);

                print(", ");

                println(n.kind.toString().toLowerCase());

            }

        }

    }

    private AnnotationWriter annotationWriter;

    private ClassWriter classWriter;

    private Map<Integer, List<Note>> pcMap;

}