/*

 * Copyright (c) 1994, 2003, 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 sun.tools.java;

import java.io.IOException;

import java.io.DataInputStream;

import java.io.DataOutputStream;

/**

 * This class is used to represent an attribute from a binary class.

 * This class should go away once arrays are objects.

 *

 * WARNING: The contents of this source file are not part of any

 * supported API.  Code that depends on them does so at its own risk:

 * they are subject to change or removal without notice.

 */

public final

class BinaryAttribute implements Constants {

    Identifier name;

    byte data[];

    BinaryAttribute next;

    /**

     * Constructor

     */

    BinaryAttribute(Identifier name, byte data[], BinaryAttribute next) {

        this.name = name;

        this.data = data;

        this.next = next;

    }

    /**

     * Load a list of attributes

     */

    public static BinaryAttribute load(DataInputStream in, BinaryConstantPool cpool, int mask) throws IOException {

        BinaryAttribute atts = null;

        int natt = in.readUnsignedShort();  // JVM 4.6 method_info.attrutes_count

        for (int i = 0 ; i < natt ; i++) {

            // id from JVM 4.7 attribute_info.attribute_name_index

            Identifier id = cpool.getIdentifier(in.readUnsignedShort());

            // id from JVM 4.7 attribute_info.attribute_length

            int len = in.readInt();

            if (id.equals(idCode) && ((mask & ATT_CODE) == 0)) {

                in.skipBytes(len);

            } else {

                byte data[] = new byte[len];

                in.readFully(data);

                atts = new BinaryAttribute(id, data, atts);

            }

        }

        return atts;

    }

    // write out the Binary attributes to the given stream

    // (note that attributes may be null)

    static void write(BinaryAttribute attributes, DataOutputStream out,

                      BinaryConstantPool cpool, Environment env) throws IOException {

        // count the number of attributes

        int attributeCount = 0;

        for (BinaryAttribute att = attributes; att != null; att = att.next)

            attributeCount++;

        out.writeShort(attributeCount);

        // write out each attribute

        for (BinaryAttribute att = attributes; att != null; att = att.next) {

            Identifier name = att.name;

            byte data[] = att.data;

            // write the identifier

            out.writeShort(cpool.indexString(name.toString(), env));

            // write the length

            out.writeInt(data.length);

            // write the data

            out.write(data, 0, data.length);

        }

    }

    /**

     * Accessors

     */

    public Identifier getName() { return name; }

    public byte getData()[] { return data; }

    public BinaryAttribute getNextAttribute() { return next; }

}