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158 lines
5.2 KiB
158 lines
5.2 KiB
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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package com.sun.org.apache.bcel.internal.classfile;
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2001 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache BCEL" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
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* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* "Apache BCEL", nor may "Apache" appear in their name, without
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* prior written permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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import com.sun.org.apache.bcel.internal.Constants;
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import java.io.*;
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/**
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* This class is derived from the abstract
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* <A HREF="com.sun.org.apache.bcel.internal.classfile.Constant.html">Constant</A> class
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* and represents a reference to a (external) class.
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*
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* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
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* @see Constant
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*/
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public final class ConstantClass extends Constant implements ConstantObject {
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private int name_index; // Identical to ConstantString except for the name
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/**
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* Initialize from another object.
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*/
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public ConstantClass(ConstantClass c) {
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this(c.getNameIndex());
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}
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/**
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* Initialize instance from file data.
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*
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* @param file Input stream
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* @throws IOException
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*/
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ConstantClass(DataInputStream file) throws IOException
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{
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this(file.readUnsignedShort());
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}
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/**
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* @param name_index Name index in constant pool. Should refer to a
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* ConstantUtf8.
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*/
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public ConstantClass(int name_index) {
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super(Constants.CONSTANT_Class);
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this.name_index = name_index;
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}
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/**
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* Called by objects that are traversing the nodes of the tree implicitely
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* defined by the contents of a Java class. I.e., the hierarchy of methods,
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* fields, attributes, etc. spawns a tree of objects.
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*
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* @param v Visitor object
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*/
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public void accept(Visitor v) {
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v.visitConstantClass(this);
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}
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/**
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* Dump constant class to file stream in binary format.
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*
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* @param file Output file stream
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* @throws IOException
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*/
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public final void dump(DataOutputStream file) throws IOException
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{
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file.writeByte(tag);
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file.writeShort(name_index);
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}
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/**
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* @return Name index in constant pool of class name.
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*/
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public final int getNameIndex() { return name_index; }
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/**
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* @param name_index.
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*/
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public final void setNameIndex(int name_index) {
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this.name_index = name_index;
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}
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/** @return String object
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*/
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public Object getConstantValue(ConstantPool cp) {
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Constant c = cp.getConstant(name_index, Constants.CONSTANT_Utf8);
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return ((ConstantUtf8)c).getBytes();
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}
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/** @return dereferenced string
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*/
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public String getBytes(ConstantPool cp) {
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return (String)getConstantValue(cp);
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}
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/**
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* @return String representation.
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*/
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public final String toString() {
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return super.toString() + "(name_index = " + name_index + ")";
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}
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}
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