Mercurial > hg > blitz_condensed
comparison src/com/go/trove/classfile/FieldInfo.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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-1:000000000000 | 0:3dc0c5604566 |
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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 } |