    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 *  Unless required by applicable law or agreed to in writing, software
    012 *  distributed under the License is distributed on an "AS IS" BASIS,
    013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 *  See the License for the specific language governing permissions and
    015 *  limitations under the License.
    016 *
    017 */
    018package org.apache.bcel.classfile;
    019
    020/**
    021 * Unknown (non-standard) attributes may be read via user-defined factory objects that can be registered with the
    022 * Attribute.addAttributeReader method. These factory objects should implement this interface.
    023 *
    024 * @see Attribute
    025 *
    026 * @deprecated Use UnknownAttributeReader instead
    027 */
    028@java.lang.Deprecated
    029public interface AttributeReader {
    030
    031    /**
    032     * When this attribute reader is added via the static method Attribute.addAttributeReader, an attribute name is
    033     * associated with it. As the class file parser parses attributes, it will call various AttributeReaders based on the
    034     * name of the attributes it is constructing.
    035     *
    036     * @param name_index An index into the constant pool, indexing a ConstantUtf8 that represents the name of the attribute.
    037     *
    038     * @param length The length of the data contained in the attribute. This is written into the constant pool and should
    039     *        agree with what the factory expects the length to be.
    040     *
    041     * @param file This is the data input stream that the factory needs to read its data from.
    042     *
    043     * @param constant_pool This is the constant pool associated with the Attribute that we are constructing.
    044     *
    045     * @return The user-defined AttributeReader should take this data and use it to construct an attribute. In the case of
    046     *         errors, a null can be returned which will cause the parsing of the class file to fail.
    047     *
    048     * @see Attribute#addAttributeReader( String, AttributeReader )
    049     */
    050    Attribute createAttribute(int name_index, int length, java.io.DataInputStream file, ConstantPool constant_pool);
    051}