Source Code Cross Referenced for ConstantValue.java in  » Database-DBMS » db4o-6.4 » EDU » purdue » cs » bloat » file » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db4o 6.4 » EDU.purdue.cs.bloat.file 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Copyright (C) 2004 - 2007  db4objects Inc.  http://www.db4o.com
002:
003:        This file is part of the db4o open source object database.
004:
005:        db4o is free software; you can redistribute it and/or modify it under
006:        the terms of version 2 of the GNU General Public License as published
007:        by the Free Software Foundation and as clarified by db4objects' GPL 
008:        interpretation policy, available at
009:        http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
010:        Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
011:        Suite 350, San Mateo, CA 94403, USA.
012:
013:        db4o is distributed in the hope that it will be useful, but WITHOUT ANY
014:        WARRANTY; without even the implied warranty of MERCHANTABILITY or
015:        FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
016:        for more details.
017:
018:        You should have received a copy of the GNU General Public License along
019:        with this program; if not, write to the Free Software Foundation, Inc.,
020:        59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
021:        package EDU.purdue.cs.bloat.file;
022:
023:        import java.io.*;
024:
025:        /**
026:         * The ConstantValue attribute stores an index into the constant pool that
027:         * represents constant value. A class's static fields have constant value
028:         * attributes.
029:         * 
030:         * @see Field
031:         * 
032:         * @author Nate Nystrom (<a
033:         *         href="mailto:nystrom@cs.purdue.edu">nystrom@cs.purdue.edu</a>)
034:         */
035:        public class ConstantValue extends Attribute {
036:            private int constantValueIndex;
037:
038:            /**
039:             * Creates a new <code>ConstantValue</code> from scratch
040:             * 
041:             * @param nameIndex
042:             *            The index in the constant pool of the UTF8 string
043:             *            "ConstantValue"
044:             * @param constantValueIndex
045:             *            The index in the constant pool of the Constant containing the
046:             *            constant value
047:             */
048:            ConstantValue(final int nameIndex, final int length,
049:                    final int constantValueIndex) {
050:                super (nameIndex, length);
051:                this .constantValueIndex = constantValueIndex;
052:            }
053:
054:            /**
055:             * Constructor. Create a ConstantValue attribute from a data stream.
056:             * 
057:             * @param in
058:             *            The data stream of the class file.
059:             * @param nameIndex
060:             *            The index into the constant pool of the name of the attribute.
061:             * @param length
062:             *            The length of the attribute, excluding the header.
063:             * @exception IOException
064:             *                If an error occurs while reading.
065:             */
066:            public ConstantValue(final DataInputStream in, final int nameIndex,
067:                    final int length) throws IOException {
068:                super (nameIndex, length);
069:                constantValueIndex = in.readUnsignedShort();
070:            }
071:
072:            /**
073:             * Write the attribute to a data stream.
074:             * 
075:             * @param out
076:             *            The data stream of the class file.
077:             */
078:            public void writeData(final DataOutputStream out)
079:                    throws IOException {
080:                out.writeShort(constantValueIndex);
081:            }
082:
083:            /**
084:             * Returns the index into the constant pool of the constant value.
085:             */
086:            public int constantValueIndex() {
087:                return constantValueIndex;
088:            }
089:
090:            /**
091:             * Set the index into the constant pool of the constant value.
092:             */
093:            public void setConstantValueIndex(final int index) {
094:                this .constantValueIndex = index;
095:            }
096:
097:            /**
098:             * Private constructor used for cloning.
099:             */
100:            private ConstantValue(final ConstantValue other) {
101:                super (other.nameIndex, other.length);
102:
103:                this .constantValueIndex = other.constantValueIndex;
104:            }
105:
106:            public Object clone() {
107:                return (new ConstantValue(this ));
108:            }
109:
110:            /**
111:             * Converts the attribute to a string.
112:             */
113:            public String toString() {
114:                return "(constant-value " + constantValueIndex + ")";
115:            }
116:        }
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