74 * field is non-primitive, object values are serialized and deserialized as
75 * if they had been written and read by calls to writeObject and
76 * readObject. If unshared is true, values of the represented field are
77 * serialized and deserialized as if they had been written and read by
78 * calls to writeUnshared and readUnshared.
79 *
80 * @param name field name
81 * @param type field type
82 * @param unshared if false, write/read field values in the same manner
83 * as writeObject/readObject; if true, write/read in the same
84 * manner as writeUnshared/readUnshared
85 * @since 1.4
86 */
87 public ObjectStreamField(String name, Class<?> type, boolean unshared) {
88 if (name == null) {
89 throw new NullPointerException();
90 }
91 this.name = name;
92 this.type = type;
93 this.unshared = unshared;
94 signature = getClassSignature(type).intern();
95 field = null;
96 }
97
98 /**
99 * Creates an ObjectStreamField representing a field with the given name,
100 * signature and unshared setting.
101 */
102 ObjectStreamField(String name, String signature, boolean unshared) {
103 if (name == null) {
104 throw new NullPointerException();
105 }
106 this.name = name;
107 this.signature = signature.intern();
108 this.unshared = unshared;
109 field = null;
110
111 switch (signature.charAt(0)) {
112 case 'Z': type = Boolean.TYPE; break;
113 case 'B': type = Byte.TYPE; break;
114 case 'C': type = Character.TYPE; break;
115 case 'S': type = Short.TYPE; break;
116 case 'I': type = Integer.TYPE; break;
117 case 'J': type = Long.TYPE; break;
118 case 'F': type = Float.TYPE; break;
119 case 'D': type = Double.TYPE; break;
120 case 'L':
121 case '[': type = Object.class; break;
122 default: throw new IllegalArgumentException("illegal signature");
123 }
124 }
125
126 /**
127 * Returns JVM type signature for given primitive.
128 */
129 private static String getPrimitiveSignature(Class<?> cl) {
130 if (cl == Integer.TYPE)
131 return "I";
132 else if (cl == Byte.TYPE)
133 return "B";
134 else if (cl == Long.TYPE)
135 return "J";
136 else if (cl == Float.TYPE)
137 return "F";
138 else if (cl == Double.TYPE)
139 return "D";
140 else if (cl == Short.TYPE)
141 return "S";
142 else if (cl == Character.TYPE)
143 return "C";
144 else if (cl == Boolean.TYPE)
145 return "Z";
146 else if (cl == Void.TYPE)
147 return "V";
148 else
149 throw new InternalError();
150 }
151
152 /**
153 * Returns JVM type signature for given class.
154 */
155 static String getClassSignature(Class<?> cl) {
156 if (cl.isPrimitive()) {
157 return getPrimitiveSignature(cl);
158 } else {
159 return appendClassSignature(new StringBuilder(), cl).toString();
160 }
161 }
162
163 static StringBuilder appendClassSignature(StringBuilder sbuf, Class<?> cl) {
164 while (cl.isArray()) {
165 sbuf.append('[');
166 cl = cl.getComponentType();
167 }
168
169 if (cl.isPrimitive()) {
170 sbuf.append(getPrimitiveSignature(cl));
171 } else {
172 sbuf.append('L').append(cl.getName().replace('.', '/')).append(';');
173 }
174
175 return sbuf;
176 }
177
178 /**
179 * Creates an ObjectStreamField representing the given field with the
180 * specified unshared setting. For compatibility with the behavior of
181 * earlier serialization implementations, a "showType" parameter is
182 * necessary to govern whether or not a getType() call on this
183 * ObjectStreamField (if non-primitive) will return Object.class (as
184 * opposed to a more specific reference type).
185 */
186 ObjectStreamField(Field field, boolean unshared, boolean showType) {
187 this.field = field;
188 this.unshared = unshared;
189 name = field.getName();
190 Class<?> ftype = field.getType();
191 type = (showType || ftype.isPrimitive()) ? ftype : Object.class;
192 signature = getClassSignature(ftype).intern();
193 }
194
195 /**
196 * Get the name of this field.
197 *
198 * @return a <code>String</code> representing the name of the serializable
199 * field
200 */
201 public String getName() {
202 return name;
203 }
204
205 /**
206 * Get the type of the field. If the type is non-primitive and this
207 * <code>ObjectStreamField</code> was obtained from a deserialized {@link
208 * ObjectStreamClass} instance, then <code>Object.class</code> is returned.
209 * Otherwise, the <code>Class</code> object for the type of the field is
210 * returned.
211 *
212 * @return a <code>Class</code> object representing the type of the
225
226 /**
227 * Returns character encoding of field type. The encoding is as follows:
228 * <blockquote><pre>
229 * B byte
230 * C char
231 * D double
232 * F float
233 * I int
234 * J long
235 * L class or interface
236 * S short
237 * Z boolean
238 * [ array
239 * </pre></blockquote>
240 *
241 * @return the typecode of the serializable field
242 */
243 // REMIND: deprecate?
244 public char getTypeCode() {
245 return signature.charAt(0);
246 }
247
248 /**
249 * Return the JVM type signature.
250 *
251 * @return null if this field has a primitive type.
252 */
253 // REMIND: deprecate?
254 public String getTypeString() {
255 return isPrimitive() ? null : signature;
256 }
257
258 /**
259 * Offset of field within instance data.
260 *
261 * @return the offset of this field
262 * @see #setOffset
263 */
264 // REMIND: deprecate?
265 public int getOffset() {
266 return offset;
267 }
268
269 /**
270 * Offset within instance data.
271 *
272 * @param offset the offset of the field
273 * @see #getOffset
274 */
275 // REMIND: deprecate?
276 protected void setOffset(int offset) {
277 this.offset = offset;
278 }
279
280 /**
281 * Return true if this field has a primitive type.
282 *
283 * @return true if and only if this field corresponds to a primitive type
284 */
285 // REMIND: deprecate?
286 public boolean isPrimitive() {
287 char tcode = signature.charAt(0);
288 return ((tcode != 'L') && (tcode != '['));
289 }
290
291 /**
292 * Returns boolean value indicating whether or not the serializable field
293 * represented by this ObjectStreamField instance is unshared.
294 *
295 * @return {@code true} if this field is unshared
296 *
297 * @since 1.4
298 */
299 public boolean isUnshared() {
300 return unshared;
301 }
302
303 /**
304 * Compare this field with another <code>ObjectStreamField</code>. Return
305 * -1 if this is smaller, 0 if equal, 1 if greater. Types that are
306 * primitives are "smaller" than object types. If equal, the field names
307 * are compared.
308 */
309 // REMIND: deprecate?
310 public int compareTo(Object obj) {
311 ObjectStreamField other = (ObjectStreamField) obj;
312 boolean isPrim = isPrimitive();
313 if (isPrim != other.isPrimitive()) {
314 return isPrim ? -1 : 1;
315 }
316 return name.compareTo(other.name);
317 }
318
319 /**
320 * Return a string that describes this field.
321 */
322 public String toString() {
323 return signature + ' ' + name;
324 }
325
326 /**
327 * Returns field represented by this ObjectStreamField, or null if
328 * ObjectStreamField is not associated with an actual field.
329 */
330 Field getField() {
331 return field;
332 }
333
334 /**
335 * Returns JVM type signature of field (similar to getTypeString, except
336 * that signature strings are returned for primitive fields as well).
337 */
338 String getSignature() {
339 return signature;
340 }
341 }
|
74 * field is non-primitive, object values are serialized and deserialized as
75 * if they had been written and read by calls to writeObject and
76 * readObject. If unshared is true, values of the represented field are
77 * serialized and deserialized as if they had been written and read by
78 * calls to writeUnshared and readUnshared.
79 *
80 * @param name field name
81 * @param type field type
82 * @param unshared if false, write/read field values in the same manner
83 * as writeObject/readObject; if true, write/read in the same
84 * manner as writeUnshared/readUnshared
85 * @since 1.4
86 */
87 public ObjectStreamField(String name, Class<?> type, boolean unshared) {
88 if (name == null) {
89 throw new NullPointerException();
90 }
91 this.name = name;
92 this.type = type;
93 this.unshared = unshared;
94 signature = null; // will be lazily obtained from type
95 field = null;
96 }
97
98 /**
99 * Creates an ObjectStreamField representing a field with the given name,
100 * signature and unshared setting.
101 */
102 ObjectStreamField(String name, String signature, boolean unshared) {
103 if (name == null) {
104 throw new NullPointerException();
105 }
106 this.name = name;
107 this.signature = signature.intern();
108 this.unshared = unshared;
109 field = null;
110
111 switch (signature.charAt(0)) {
112 case 'Z': type = Boolean.TYPE; break;
113 case 'B': type = Byte.TYPE; break;
114 case 'C': type = Character.TYPE; break;
115 case 'S': type = Short.TYPE; break;
116 case 'I': type = Integer.TYPE; break;
117 case 'J': type = Long.TYPE; break;
118 case 'F': type = Float.TYPE; break;
119 case 'D': type = Double.TYPE; break;
120 case 'L':
121 case '[': type = Object.class; break;
122 default: throw new IllegalArgumentException("illegal signature");
123 }
124 }
125
126 /**
127 * Creates an ObjectStreamField representing the given field with the
128 * specified unshared setting. For compatibility with the behavior of
129 * earlier serialization implementations, a "showType" parameter is
130 * necessary to govern whether or not a getType() call on this
131 * ObjectStreamField (if non-primitive) will return Object.class (as
132 * opposed to a more specific reference type).
133 */
134 ObjectStreamField(Field field, boolean unshared, boolean showType) {
135 this.field = field;
136 this.unshared = unshared;
137 name = field.getName();
138 Class<?> ftype = field.getType();
139 if (showType || ftype.isPrimitive()) {
140 type = ftype;
141 signature = null; // will be lazily obtained from type
142 } else {
143 type = Object.class;
144 signature = ftype.getJvmTypeSignature();
145 }
146 }
147
148 /**
149 * Get the name of this field.
150 *
151 * @return a <code>String</code> representing the name of the serializable
152 * field
153 */
154 public String getName() {
155 return name;
156 }
157
158 /**
159 * Get the type of the field. If the type is non-primitive and this
160 * <code>ObjectStreamField</code> was obtained from a deserialized {@link
161 * ObjectStreamClass} instance, then <code>Object.class</code> is returned.
162 * Otherwise, the <code>Class</code> object for the type of the field is
163 * returned.
164 *
165 * @return a <code>Class</code> object representing the type of the
178
179 /**
180 * Returns character encoding of field type. The encoding is as follows:
181 * <blockquote><pre>
182 * B byte
183 * C char
184 * D double
185 * F float
186 * I int
187 * J long
188 * L class or interface
189 * S short
190 * Z boolean
191 * [ array
192 * </pre></blockquote>
193 *
194 * @return the typecode of the serializable field
195 */
196 // REMIND: deprecate?
197 public char getTypeCode() {
198 return getSignature().charAt(0);
199 }
200
201 /**
202 * Return the JVM type signature.
203 *
204 * @return null if this field has a primitive type.
205 */
206 // REMIND: deprecate?
207 public String getTypeString() {
208 return isPrimitive() ? null : getSignature();
209 }
210
211 /**
212 * Offset of field within instance data.
213 *
214 * @return the offset of this field
215 * @see #setOffset
216 */
217 // REMIND: deprecate?
218 public int getOffset() {
219 return offset;
220 }
221
222 /**
223 * Offset within instance data.
224 *
225 * @param offset the offset of the field
226 * @see #getOffset
227 */
228 // REMIND: deprecate?
229 protected void setOffset(int offset) {
230 this.offset = offset;
231 }
232
233 /**
234 * Return true if this field has a primitive type.
235 *
236 * @return true if and only if this field corresponds to a primitive type
237 */
238 // REMIND: deprecate?
239 public boolean isPrimitive() {
240 char tcode = getSignature().charAt(0);
241 return ((tcode != 'L') && (tcode != '['));
242 }
243
244 /**
245 * Returns boolean value indicating whether or not the serializable field
246 * represented by this ObjectStreamField instance is unshared.
247 *
248 * @return {@code true} if this field is unshared
249 *
250 * @since 1.4
251 */
252 public boolean isUnshared() {
253 return unshared;
254 }
255
256 /**
257 * Compare this field with another <code>ObjectStreamField</code>. Return
258 * -1 if this is smaller, 0 if equal, 1 if greater. Types that are
259 * primitives are "smaller" than object types. If equal, the field names
260 * are compared.
261 */
262 // REMIND: deprecate?
263 public int compareTo(Object obj) {
264 ObjectStreamField other = (ObjectStreamField) obj;
265 boolean isPrim = isPrimitive();
266 if (isPrim != other.isPrimitive()) {
267 return isPrim ? -1 : 1;
268 }
269 return name.compareTo(other.name);
270 }
271
272 /**
273 * Return a string that describes this field.
274 */
275 public String toString() {
276 return getSignature() + ' ' + name;
277 }
278
279 /**
280 * Returns field represented by this ObjectStreamField, or null if
281 * ObjectStreamField is not associated with an actual field.
282 */
283 Field getField() {
284 return field;
285 }
286
287 /**
288 * Returns JVM type signature of field (similar to getTypeString, except
289 * that signature strings are returned for primitive fields as well).
290 */
291 String getSignature() {
292 return signature == null ? type.getJvmTypeSignature() : signature;
293 }
294 }
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