Source Code Cross Referenced for Constant.java in  » Database-DBMS » db4o-6.4 » EDU » purdue » cs » bloat » reflect » 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.reflect 
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.reflect;
022:
023:        /**
024:         * A Constant is used to represent an item in the constant pool of a class.
025:         * 
026:         * @author Nate Nystrom (<a
027:         *         href="mailto:nystrom@cs.purdue.edu">nystrom@cs.purdue.edu</a>)
028:         */
029:        public final class Constant {
030:            private int tag;
031:
032:            private Object value;
033:
034:            /**
035:             * Constant tag for class types. This is used to reference other classes,
036:             * such as the superclass, and is used by the checkcast and instanceof
037:             * instructions. The Fieldref, Methodref and InterfaceMethodref constant
038:             * types refer to this constant type.
039:             */
040:            public static final byte CLASS = 7;
041:
042:            /**
043:             * Constant tag for field references. This is used to reference a field in
044:             * (possibly) another class. The getfield, putfield, getstatic, and
045:             * putstatic instructions use this constant type.
046:             */
047:            public static final byte FIELD_REF = 9;
048:
049:            /**
050:             * Constant tag for method references. This is used to reference a method in
051:             * (possibly) another class. The invokevirtual, invokespecial, and
052:             * invokestatic instructions use this constant type.
053:             */
054:            public static final byte METHOD_REF = 10;
055:
056:            /**
057:             * Constant tag for java.lang.String constants. The actual string value is
058:             * stored indirectly in a Utf8 constant.
059:             */
060:            public static final byte STRING = 8;
061:
062:            /**
063:             * Constant tag for int, short, byte, char, and boolean constants.
064:             */
065:            public static final byte INTEGER = 3;
066:
067:            /**
068:             * Constant tag for float constants.
069:             */
070:            public static final byte FLOAT = 4;
071:
072:            /**
073:             * Constant tag for long constants.
074:             */
075:            public static final byte LONG = 5;
076:
077:            /**
078:             * Constant tag for double constants.
079:             */
080:            public static final byte DOUBLE = 6;
081:
082:            /**
083:             * Constant tag for method references. This is used to reference a method in
084:             * an interface. The invokeinterface instruction uses this constant type.
085:             */
086:            public static final byte INTERFACE_METHOD_REF = 11;
087:
088:            /**
089:             * Constant tag for holding the name and type of a field or method. The
090:             * Fieldref, Methodref and InterfaceMethodref constant types refer to this
091:             * constant type.
092:             */
093:            public static final byte NAME_AND_TYPE = 12;
094:
095:            /**
096:             * Constant tag for holding the a UTF8 format string. The string is used to
097:             * hold the name and type descriptor for NameandType constants, the class
098:             * name for Class constants, the string value for String constants.
099:             */
100:            public static final byte UTF8 = 1;
101:
102:            /**
103:             * @param tag
104:             *            The constant's tag.
105:             * @param value
106:             *            The constant's value.
107:             */
108:            public Constant(final int tag, final Object value) {
109:                this .tag = tag;
110:                this .value = value;
111:            }
112:
113:            /**
114:             * Get the tag of the constant.
115:             * 
116:             * @return The tag.
117:             */
118:            public final int tag() {
119:                return tag;
120:            }
121:
122:            /**
123:             * Get the value of the constant.
124:             * 
125:             * @return The value.
126:             */
127:            public final Object value() {
128:                return value;
129:            }
130:
131:            /**
132:             * Hash the constant.
133:             * 
134:             * @return The hash code.
135:             */
136:            public int hashCode() {
137:                switch (tag) {
138:                case CLASS:
139:                case STRING:
140:                case INTEGER:
141:                case FLOAT:
142:                case LONG:
143:                case DOUBLE:
144:                case UTF8:
145:                    return tag ^ value.hashCode();
146:                case FIELD_REF:
147:                case METHOD_REF:
148:                case INTERFACE_METHOD_REF:
149:                case NAME_AND_TYPE:
150:                    return tag ^ ((int[]) value)[0] ^ ((int[]) value)[1];
151:                }
152:
153:                return tag;
154:            }
155:
156:            /**
157:             * Check if an object is equal to this constant.
158:             * 
159:             * @param other
160:             *            The object to compare against.
161:             * @return true if equal, false if not.
162:             */
163:            public boolean equals(final Object other) {
164:                if (!(other instanceof  Constant)) {
165:                    return false;
166:                }
167:
168:                final Constant c = (Constant) other;
169:
170:                if (tag != c.tag) {
171:                    return false;
172:                }
173:
174:                switch (tag) {
175:                case CLASS:
176:                case STRING:
177:                case INTEGER:
178:                case FLOAT:
179:                case LONG:
180:                case DOUBLE:
181:                case UTF8:
182:                    return value.equals(c.value);
183:                case FIELD_REF:
184:                case METHOD_REF:
185:                case INTERFACE_METHOD_REF:
186:                case NAME_AND_TYPE:
187:                    return (((int[]) value)[0] == ((int[]) c.value)[0])
188:                            && (((int[]) value)[1] == ((int[]) c.value)[1]);
189:                }
190:
191:                return false;
192:            }
193:
194:            /**
195:             * Convert the constant to a string.
196:             * 
197:             * @return A string representation of the constant.
198:             */
199:            public String toString() {
200:                switch (tag) {
201:                case CLASS:
202:                    return "Class " + value.toString();
203:                case STRING:
204:                    return "String " + value.toString();
205:                case INTEGER:
206:                    return "Integer " + value.toString();
207:                case FLOAT:
208:                    return "Float " + value.toString();
209:                case LONG:
210:                    return "Long " + value.toString();
211:                case DOUBLE:
212:                    return "Double " + value.toString();
213:                case UTF8:
214:                    final StringBuffer sb = new StringBuffer();
215:                    final String s = (String) value;
216:                    for (int i = 0; i < s.length(); i++) {
217:                        final char c = s.charAt(i);
218:                        if (Character.isWhitespace(c)
219:                                || ((0x20 <= c) && (c <= 0x7e))) {
220:                            sb.append(c);
221:                        } else {
222:                            sb.append("\\u");
223:                            sb.append(Integer.toHexString(c));
224:                        }
225:                        if (sb.length() > 50) {
226:                            sb.append("...");
227:                            break;
228:                        }
229:                    }
230:                    return "Utf8 '" + sb.toString() + "'";
231:                case FIELD_REF:
232:                    return "Fieldref " + ((int[]) value)[0] + " "
233:                            + ((int[]) value)[1];
234:                case METHOD_REF:
235:                    return "Methodref " + ((int[]) value)[0] + " "
236:                            + ((int[]) value)[1];
237:                case INTERFACE_METHOD_REF:
238:                    return "InterfaceMethodref " + ((int[]) value)[0] + " "
239:                            + ((int[]) value)[1];
240:                case NAME_AND_TYPE:
241:                    return "NameandType " + ((int[]) value)[0] + " "
242:                            + ((int[]) value)[1];
243:                }
244:
245:                return "unknown constant";
246:            }
247:        }
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