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