- 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.
- *
- * @version $Id: ConstantValue.java,v 1.1.1.1 2001/10/29 20:00:00 jvanzyl Exp $
- * @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
- * @throw 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() throws InternalError
- {
- 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 = "\"" + convertString(((ConstantUtf8)c).getBytes()) + "\"";
- break;
- default: throw new InternalError("Type of ConstValue invalid: " + c);
- }
-
- return buf;
- }
-
- /**
- * Escape all occurences of newline chars '\n', quotes \", etc.
- */
- private static final String convertString(String label) {
- char[] ch = label.toCharArray();
- StringBuffer buf = new StringBuffer();
-
- for(int i=0; i < ch.length; i++) {
- switch(ch[i]) {
- case '\n':
- buf.append("\\n"); break;
- case '\r':
- buf.append("\\r"); break;
- case '\"':
- buf.append("\\\""); break;
- case '\'':
- buf.append("\\'"); break;
- case '\\':
- buf.append("\\\\"); break;
- default:
- buf.append(ch[i]); break;
- }
- }
-
- return buf.toString();
- }
-
- /**
- * @return deep copy of this attribute
- */
- public Attribute copy(ConstantPool constant_pool) {
- ConstantValue c = (ConstantValue)clone();
- c.constant_pool = constant_pool;
- return c;
- }
- }