    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 */
    017package org.apache.commons.compress.harmony.unpack200.bytecode;
    018
    019import java.io.DataOutputStream;
    020import java.io.IOException;
    021import java.util.Collections;
    022import java.util.List;
    023
    024/**
    025 * Superclass for member constant pool entries, such as fields or methods.
    026 */
    027public class CPMember extends ClassFileEntry {
    028
    029    List attributes;
    030    short flags;
    031    CPUTF8 name;
    032    transient int nameIndex;
    033    protected final CPUTF8 descriptor;
    034    transient int descriptorIndex;
    035
    036    /**
    037     * Create a new CPMember
    038     *
    039     * @param name TODO
    040     * @param descriptor TODO
    041     * @param flags TODO
    042     * @param attributes TODO
    043     * @throws NullPointerException if name or descriptor is null
    044     */
    045    public CPMember(final CPUTF8 name, final CPUTF8 descriptor, final long flags, final List attributes) {
    046        this.name = name;
    047        this.descriptor = descriptor;
    048        this.flags = (short) flags;
    049        this.attributes = (attributes == null ? Collections.EMPTY_LIST : attributes);
    050        if (name == null || descriptor == null) {
    051            throw new NullPointerException("Null arguments are not allowed");
    052        }
    053    }
    054
    055    @Override
    056    protected ClassFileEntry[] getNestedClassFileEntries() {
    057        final int attributeCount = attributes.size();
    058        final ClassFileEntry[] entries = new ClassFileEntry[attributeCount + 2];
    059        entries[0] = name;
    060        entries[1] = descriptor;
    061        for (int i = 0; i < attributeCount; i++) {
    062            entries[i + 2] = (Attribute) attributes.get(i);
    063        }
    064        return entries;
    065    }
    066
    067    @Override
    068    protected void resolve(final ClassConstantPool pool) {
    069        super.resolve(pool);
    070        nameIndex = pool.indexOf(name);
    071        descriptorIndex = pool.indexOf(descriptor);
    072        for (int it = 0; it < attributes.size(); it++) {
    073            final Attribute attribute = (Attribute) attributes.get(it);
    074            attribute.resolve(pool);
    075        }
    076    }
    077
    078    @Override
    079    public int hashCode() {
    080        final int PRIME = 31;
    081        int result = 1;
    082        result = PRIME * result + attributes.hashCode();
    083        result = PRIME * result + descriptor.hashCode();
    084        result = PRIME * result + flags;
    085        result = PRIME * result + name.hashCode();
    086        return result;
    087    }
    088
    089    @Override
    090    public String toString() {
    091        return "CPMember: " + name + "(" + descriptor + ")";
    092    }
    093
    094    @Override
    095    public boolean equals(final Object obj) {
    096        if (this == obj) {
    097            return true;
    098        }
    099        if (obj == null) {
    100            return false;
    101        }
    102        if (getClass() != obj.getClass()) {
    103            return false;
    104        }
    105        final CPMember other = (CPMember) obj;
    106        if (!attributes.equals(other.attributes)) {
    107            return false;
    108        }
    109        if (!descriptor.equals(other.descriptor)) {
    110            return false;
    111        }
    112        if (flags != other.flags) {
    113            return false;
    114        }
    115        if (!name.equals(other.name)) {
    116            return false;
    117        }
    118        return true;
    119    }
    120
    121    @Override
    122    protected void doWrite(final DataOutputStream dos) throws IOException {
    123        dos.writeShort(flags);
    124        dos.writeShort(nameIndex);
    125        dos.writeShort(descriptorIndex);
    126        final int attributeCount = attributes.size();
    127        dos.writeShort(attributeCount);
    128        for (int i = 0; i < attributeCount; i++) {
    129            final Attribute attribute = (Attribute) attributes.get(i);
    130            attribute.doWrite(dos);
    131        }
    132    }
    133
    134}