/*

 * Copyright (c) 2007, 2008, 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.classfile;

import java.io.IOException;

/**

 * See JVMS, section 4.8.12.

 *

 *  <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 LineNumberTable_attribute extends Attribute {

    LineNumberTable_attribute(ClassReader cr, int name_index, int length) throws IOException {

        super(name_index, length);

        line_number_table_length = cr.readUnsignedShort();

        line_number_table = new Entry[line_number_table_length];

        for (int i = 0; i < line_number_table_length; i++)

            line_number_table[i] = new Entry(cr);

    }

    public LineNumberTable_attribute(ConstantPool constant_pool, Entry[] line_number_table)

            throws ConstantPoolException {

        this(constant_pool.getUTF8Index(Attribute.LineNumberTable), line_number_table);

    }

    public LineNumberTable_attribute(int name_index, Entry[] line_number_table) {

        super(name_index, 2 + line_number_table.length * Entry.length());

        this.line_number_table_length = line_number_table.length;

        this.line_number_table = line_number_table;

    }

    public <R, D> R accept(Visitor<R, D> visitor, D data) {

        return visitor.visitLineNumberTable(this, data);

    }

    public final int line_number_table_length;

    public final Entry[] line_number_table;

    public static class Entry {

        Entry(ClassReader cr) throws IOException {

            start_pc = cr.readUnsignedShort();

            line_number = cr.readUnsignedShort();

        }

        public static int length() {

            return 4;

        }

        public final int start_pc;

        public final int line_number;

    }

}