| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| package com.sun.org.apache.bcel.internal.classfile; |
| |
| /* ==================================================================== |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2001 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Apache" and "Apache Software Foundation" and |
| * "Apache BCEL" must not be used to endorse or promote products |
| * derived from this software without prior written permission. For |
| * written permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * "Apache BCEL", nor may "Apache" appear in their name, without |
| * prior written permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| |
| import com.sun.org.apache.bcel.internal.Constants; |
| import java.io.*; |
| |
| /** |
| * This class is derived from <em>Attribute</em> and represents a constant |
| * value, i.e., a default value for initializing a class field. |
| * This class is instantiated by the <em>Attribute.readAttribute()</em> method. |
| * |
| * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> |
| * @see Attribute |
| */ |
| public final class ConstantValue extends Attribute { |
| private int constantvalue_index; |
| |
| /** |
| * Initialize from another object. Note that both objects use the same |
| * references (shallow copy). Use clone() for a physical copy. |
| */ |
| public ConstantValue(ConstantValue c) { |
| this(c.getNameIndex(), c.getLength(), c.getConstantValueIndex(), |
| c.getConstantPool()); |
| } |
| |
| /** |
| * Construct object from file stream. |
| * @param name_index Name index in constant pool |
| * @param length Content length in bytes |
| * @param file Input stream |
| * @param constant_pool Array of constants |
| * @throw IOException |
| */ |
| ConstantValue(int name_index, int length, DataInputStream file, |
| ConstantPool constant_pool) throws IOException |
| { |
| this(name_index, length, (int)file.readUnsignedShort(), constant_pool); |
| } |
| |
| /** |
| * @param name_index Name index in constant pool |
| * @param length Content length in bytes |
| * @param constantvalue_index Index in constant pool |
| * @param constant_pool Array of constants |
| */ |
| public ConstantValue(int name_index, int length, |
| int constantvalue_index, |
| ConstantPool constant_pool) |
| { |
| super(Constants.ATTR_CONSTANT_VALUE, name_index, length, constant_pool); |
| this.constantvalue_index = constantvalue_index; |
| } |
| |
| /** |
| * Called by objects that are traversing the nodes of the tree implicitely |
| * defined by the contents of a Java class. I.e., the hierarchy of methods, |
| * fields, attributes, etc. spawns a tree of objects. |
| * |
| * @param v Visitor object |
| */ |
| public void accept(Visitor v) { |
| v.visitConstantValue(this); |
| } |
| /** |
| * Dump constant value attribute to file stream on binary format. |
| * |
| * @param file Output file stream |
| * @throws IOException |
| */ |
| public final void dump(DataOutputStream file) throws IOException |
| { |
| super.dump(file); |
| file.writeShort(constantvalue_index); |
| } |
| /** |
| * @return Index in constant pool of constant value. |
| */ |
| public final int getConstantValueIndex() { return constantvalue_index; } |
| |
| /** |
| * @param constantvalue_index. |
| */ |
| public final void setConstantValueIndex(int constantvalue_index) { |
| this.constantvalue_index = constantvalue_index; |
| } |
| |
| /** |
| * @return String representation of constant value. |
| */ |
| public final String toString() { |
| Constant c = constant_pool.getConstant(constantvalue_index); |
| |
| String buf; |
| int i; |
| |
| // Print constant to string depending on its type |
| switch(c.getTag()) { |
| case Constants.CONSTANT_Long: buf = "" + ((ConstantLong)c).getBytes(); break; |
| case Constants.CONSTANT_Float: buf = "" + ((ConstantFloat)c).getBytes(); break; |
| case Constants.CONSTANT_Double: buf = "" + ((ConstantDouble)c).getBytes(); break; |
| case Constants.CONSTANT_Integer: buf = "" + ((ConstantInteger)c).getBytes(); break; |
| case Constants.CONSTANT_String: |
| i = ((ConstantString)c).getStringIndex(); |
| c = constant_pool.getConstant(i, Constants.CONSTANT_Utf8); |
| buf = "\"" + Utility.convertString(((ConstantUtf8)c).getBytes()) + "\""; |
| break; |
| |
| default: |
| throw new IllegalStateException("Type of ConstValue invalid: " + c); |
| } |
| |
| return buf; |
| } |
| |
| /** |
| * @return deep copy of this attribute |
| */ |
| public Attribute copy(ConstantPool constant_pool) { |
| ConstantValue c = (ConstantValue)clone(); |
| c.constant_pool = constant_pool; |
| return c; |
| } |
| } |