Mercurial > hg > blitz_stable

comparison src/com/go/trove/classfile/FieldInfo.java @ 0:3dc0c5604566

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
parents
children
comparison
equal deleted inserted replaced
-1:000000000000 0:3dc0c5604566
1 /* ====================================================================
2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
3 * ====================================================================
4 * The Tea Software License, Version 1.1
5 *
6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. The end-user documentation included with the redistribution,
21 * if any, must include the following acknowledgment:
22 * "This product includes software developed by the
23 * Walt Disney Internet Group (http://opensource.go.com/)."
24 * Alternately, this acknowledgment may appear in the software itself,
25 * if and wherever such third-party acknowledgments normally appear.
26 *
27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
28 * not be used to endorse or promote products derived from this
29 * software without prior written permission. For written
30 * permission, please contact opensource@dig.com.
31 *
32 * 5. Products derived from this software may not be called "Tea",
33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
35 * written permission of the Walt Disney Internet Group.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
49 *
50 * For more information about Tea, please see http://opensource.go.com/.
51 */
52
53 package com.go.trove.classfile;
54
55 import java.util.*;
56 import java.io.*;
57 import java.lang.reflect.Modifier;
58
59 /******************************************************************************
60 * This class corresponds to the field_info structure as defined in
61 * section 4.5 of <i>The Java Virtual Machine Specification</i>.
62 *
63 * @author Brian S O'Neill
64 * @version
65 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/11/27 <!-- $-->
66 * @see ClassFile
67 */
68 public class FieldInfo {
69 private ClassFile mParent;
70 private ConstantPool mCp;
71
72 private String mName;
73 private TypeDescriptor mType;
74
75 private int mAccessFlags;
76
77 private ConstantUTFInfo mNameConstant;
78 private ConstantUTFInfo mDescriptorConstant;
79
80 private List mAttributes = new ArrayList(2);
81
82 private ConstantValueAttr mConstant;
83
84 FieldInfo(ClassFile parent,
85 AccessFlags flags,
86 String name,
87 TypeDescriptor type) {
88
89 mParent = parent;
90 mCp = parent.getConstantPool();
91 mName = name;
92 mType = type;
93
94 mAccessFlags = flags.getModifier();
95 mNameConstant = ConstantUTFInfo.make(mCp, name);
96 mDescriptorConstant = ConstantUTFInfo.make(mCp, type.toString());
97 }
98
99 private FieldInfo(ClassFile parent,
100 int flags,
101 ConstantUTFInfo nameConstant,
102 ConstantUTFInfo descConstant) {
103
104 mParent = parent;
105 mCp = parent.getConstantPool();
106 mName = nameConstant.getValue();
107 mType = TypeDescriptor.parseTypeDesc(descConstant.getValue());
108
109 mAccessFlags = flags;
110 mNameConstant = nameConstant;
111 mDescriptorConstant = descConstant;
112 }
113
114 /**
115 * Returns the parent ClassFile for this FieldInfo.
116 */
117 public ClassFile getClassFile() {
118 return mParent;
119 }
120
121 /**
122 * Returns the name of this field.
123 */
124 public String getName() {
125 return mName;
126 }
127
128 /**
129 * Returns the type of this field.
130 */
131 public TypeDescriptor getType() {
132 return mType;
133 }
134
135 /**
136 * Returns a copy of this field's access flags.
137 */
138 public AccessFlags getAccessFlags() {
139 return new AccessFlags(mAccessFlags);
140 }
141
142 /**
143 * Returns a constant from the constant pool with this field's name.
144 */
145 public ConstantUTFInfo getNameConstant() {
146 return mNameConstant;
147 }
148
149 /**
150 * Returns a constant from the constant pool with this field's type
151 * descriptor string.
152 * @see TypeDescriptor
153 */
154 public ConstantUTFInfo getDescriptorConstant() {
155 return mDescriptorConstant;
156 }
157
158 /**
159 * Returns the constant value for this field or null if no constant set.
160 */
161 public ConstantInfo getConstantValue() {
162 if (mConstant == null) {
163 return null;
164 }
165 else {
166 return mConstant.getConstant();
167 }
168 }
169
170 public boolean isSynthetic() {
171 for (int i = mAttributes.size(); --i >= 0; ) {
172 Object obj = mAttributes.get(i);
173 if (obj instanceof SyntheticAttr) {
174 return true;
175 }
176 }
177 return false;
178 }
179
180 public boolean isDeprecated() {
181 for (int i = mAttributes.size(); --i >= 0; ) {
182 Object obj = mAttributes.get(i);
183 if (obj instanceof DeprecatedAttr) {
184 return true;
185 }
186 }
187 return false;
188 }
189
190 /**
191 * Set the constant value for this field as an int.
192 */
193 public void setConstantValue(int value) {
194 addAttribute(new ConstantValueAttr
195 (mCp, ConstantIntegerInfo.make(mCp, value)));
196 }
197
198 /**
199 * Set the constant value for this field as a float.
200 */
201 public void setConstantValue(float value) {
202 addAttribute(new ConstantValueAttr
203 (mCp, ConstantFloatInfo.make(mCp, value)));
204 }
205
206 /**
207 * Set the constant value for this field as a long.
208 */
209 public void setConstantValue(long value) {
210 addAttribute(new ConstantValueAttr
211 (mCp, ConstantLongInfo.make(mCp, value)));
212 }
213
214 /**
215 * Set the constant value for this field as a double.
216 */
217 public void setConstantValue(double value) {
218 addAttribute(new ConstantValueAttr
219 (mCp, ConstantDoubleInfo.make(mCp, value)));
220 }
221
222 /**
223 * Set the constant value for this field as a string.
224 */
225 public void setConstantValue(String value) {
226 addAttribute(new ConstantValueAttr
227 (mCp, ConstantStringInfo.make(mCp, value)));
228 }
229
230 /**
231 * Mark this field as being synthetic by adding a special attribute.
232 */
233 public void markSynthetic() {
234 addAttribute(new SyntheticAttr(mCp));
235 }
236
237 /**
238 * Mark this field as being deprecated by adding a special attribute.
239 */
240 public void markDeprecated() {
241 addAttribute(new DeprecatedAttr(mCp));
242 }
243
244 public void addAttribute(Attribute attr) {
245 if (attr instanceof ConstantValueAttr) {
246 if (mConstant != null) {
247 mAttributes.remove(mConstant);
248 }
249 mConstant = (ConstantValueAttr)attr;
250 }
251
252 mAttributes.add(attr);
253 }
254
255 public Attribute[] getAttributes() {
256 Attribute[] attrs = new Attribute[mAttributes.size()];
257 return (Attribute[])mAttributes.toArray(attrs);
258 }
259
260 /**
261 * Returns the length (in bytes) of this object in the class file.
262 */
263 public int getLength() {
264 int length = 8;
265
266 int size = mAttributes.size();
267 for (int i=0; i<size; i++) {
268 length += ((Attribute)mAttributes.get(i)).getLength();
269 }
270
271 return length;
272 }
273
274 public void writeTo(DataOutput dout) throws IOException {
275 dout.writeShort(mAccessFlags);
276 dout.writeShort(mNameConstant.getIndex());
277 dout.writeShort(mDescriptorConstant.getIndex());
278
279 int size = mAttributes.size();
280 dout.writeShort(size);
281 for (int i=0; i<size; i++) {
282 Attribute attr = (Attribute)mAttributes.get(i);
283 attr.writeTo(dout);
284 }
285 }
286
287 public String toString() {
288 String modStr = Modifier.toString(mAccessFlags);
289 if (modStr.length() == 0) {
290 return String.valueOf(mType) + ' ' + getName();
291 }
292 else {
293 return modStr + ' ' + mType + ' ' + getName();
294 }
295 }
296
297 static FieldInfo readFrom(ClassFile parent,
298 DataInput din,
299 AttributeFactory attrFactory)
300 throws IOException
301 {
302 ConstantPool cp = parent.getConstantPool();
303
304 int flags = din.readUnsignedShort();
305 int index = din.readUnsignedShort();
306 ConstantUTFInfo nameConstant = (ConstantUTFInfo)cp.getConstant(index);
307 index = din.readUnsignedShort();
308 ConstantUTFInfo descConstant = (ConstantUTFInfo)cp.getConstant(index);
309
310 FieldInfo info = new FieldInfo(parent, flags,
311 nameConstant, descConstant);
312
313 // Read attributes.
314 int size = din.readUnsignedShort();
315 for (int i=0; i<size; i++) {
316 info.addAttribute(Attribute.readFrom(cp, din, attrFactory));
317 }
318
319 return info;
320 }
321 }