Source Code Cross Referenced for FieldWriter.java in  » Rule-Engine » drolls-Rule-Engine » org » drools » asm » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Rule Engine » drolls Rule Engine » org.drools.asm 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /***
002:         * ASM: a very small and fast Java bytecode manipulation framework
003:         * Copyright (c) 2000-2005 INRIA, France Telecom
004:         * All rights reserved.
005:         *
006:         * Redistribution and use in source and binary forms, with or without
007:         * modification, are permitted provided that the following conditions
008:         * are met:
009:         * 1. Redistributions of source code must retain the above copyright
010:         *    notice, this list of conditions and the following disclaimer.
011:         * 2. Redistributions in binary form must reproduce the above copyright
012:         *    notice, this list of conditions and the following disclaimer in the
013:         *    documentation and/or other materials provided with the distribution.
014:         * 3. Neither the name of the copyright holders nor the names of its
015:         *    contributors may be used to endorse or promote products derived from
016:         *    this software without specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
020:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
021:         * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
022:         * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
023:         * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
024:         * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
025:         * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
026:         * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
027:         * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
028:         * THE POSSIBILITY OF SUCH DAMAGE.
029:         */package org.drools.asm;
030:
031:        /**
032:         * An {@link FieldVisitor} that generates Java fields in bytecode form.
033:         * 
034:         * @author Eric Bruneton
035:         */
036:        final class FieldWriter implements  FieldVisitor {
037:
038:            /**
039:             * Next field writer (see {@link ClassWriter#firstField firstField}).
040:             */
041:            FieldWriter next;
042:
043:            /**
044:             * The class writer to which this field must be added.
045:             */
046:            private ClassWriter cw;
047:
048:            /**
049:             * Access flags of this field.
050:             */
051:            private int access;
052:
053:            /**
054:             * The index of the constant pool item that contains the name of this
055:             * method.
056:             */
057:            private int name;
058:
059:            /**
060:             * The index of the constant pool item that contains the descriptor of this
061:             * field.
062:             */
063:            private int desc;
064:
065:            /**
066:             * The index of the constant pool item that contains the signature of this
067:             * field.
068:             */
069:            private int signature;
070:
071:            /**
072:             * The index of the constant pool item that contains the constant value of
073:             * this field.
074:             */
075:            private int value;
076:
077:            /**
078:             * The runtime visible annotations of this field. May be <tt>null</tt>.
079:             */
080:            private AnnotationWriter anns;
081:
082:            /**
083:             * The runtime invisible annotations of this field. May be <tt>null</tt>.
084:             */
085:            private AnnotationWriter ianns;
086:
087:            /**
088:             * The non standard attributes of this field. May be <tt>null</tt>.
089:             */
090:            private Attribute attrs;
091:
092:            // ------------------------------------------------------------------------
093:            // Constructor
094:            // ------------------------------------------------------------------------
095:
096:            /**
097:             * Constructs a new {@link FieldWriter}.
098:             * 
099:             * @param cw the class writer to which this field must be added.
100:             * @param access the field's access flags (see {@link Opcodes}).
101:             * @param name the field's name.
102:             * @param desc the field's descriptor (see {@link Type}).
103:             * @param signature the field's signature. May be <tt>null</tt>.
104:             * @param value the field's constant value. May be <tt>null</tt>.
105:             */
106:            protected FieldWriter(final ClassWriter cw, final int access,
107:                    final String name, final String desc,
108:                    final String signature, final Object value) {
109:                if (cw.firstField == null) {
110:                    cw.firstField = this ;
111:                } else {
112:                    cw.lastField.next = this ;
113:                }
114:                cw.lastField = this ;
115:                this .cw = cw;
116:                this .access = access;
117:                this .name = cw.newUTF8(name);
118:                this .desc = cw.newUTF8(desc);
119:                if (signature != null) {
120:                    this .signature = cw.newUTF8(signature);
121:                }
122:                if (value != null) {
123:                    this .value = cw.newConstItem(value).index;
124:                }
125:            }
126:
127:            // ------------------------------------------------------------------------
128:            // Implementation of the FieldVisitor interface
129:            // ------------------------------------------------------------------------
130:
131:            public AnnotationVisitor visitAnnotation(final String desc,
132:                    final boolean visible) {
133:                final ByteVector bv = new ByteVector();
134:                // write type, and reserve space for values count
135:                bv.putShort(this .cw.newUTF8(desc)).putShort(0);
136:                final AnnotationWriter aw = new AnnotationWriter(this .cw, true,
137:                        bv, bv, 2);
138:                if (visible) {
139:                    aw.next = this .anns;
140:                    this .anns = aw;
141:                } else {
142:                    aw.next = this .ianns;
143:                    this .ianns = aw;
144:                }
145:                return aw;
146:            }
147:
148:            public void visitAttribute(final Attribute attr) {
149:                attr.next = this .attrs;
150:                this .attrs = attr;
151:            }
152:
153:            public void visitEnd() {
154:            }
155:
156:            // ------------------------------------------------------------------------
157:            // Utility methods
158:            // ------------------------------------------------------------------------
159:
160:            /**
161:             * Returns the size of this field.
162:             * 
163:             * @return the size of this field.
164:             */
165:            int getSize() {
166:                int size = 8;
167:                if (this .value != 0) {
168:                    this .cw.newUTF8("ConstantValue");
169:                    size += 8;
170:                }
171:                if ((this .access & Opcodes.ACC_SYNTHETIC) != 0
172:                        && (this .cw.version & 0xffff) < Opcodes.V1_5) {
173:                    this .cw.newUTF8("Synthetic");
174:                    size += 6;
175:                }
176:                if ((this .access & Opcodes.ACC_DEPRECATED) != 0) {
177:                    this .cw.newUTF8("Deprecated");
178:                    size += 6;
179:                }
180:                if (this .cw.version == Opcodes.V1_4
181:                        && (this .access & Opcodes.ACC_ENUM) != 0) {
182:                    this .cw.newUTF8("Enum");
183:                    size += 6;
184:                }
185:                if (this .signature != 0) {
186:                    this .cw.newUTF8("Signature");
187:                    size += 8;
188:                }
189:                if (this .anns != null) {
190:                    this .cw.newUTF8("RuntimeVisibleAnnotations");
191:                    size += 8 + this .anns.getSize();
192:                }
193:                if (this .ianns != null) {
194:                    this .cw.newUTF8("RuntimeInvisibleAnnotations");
195:                    size += 8 + this .ianns.getSize();
196:                }
197:                if (this .attrs != null) {
198:                    size += this .attrs.getSize(this .cw, null, 0, -1, -1);
199:                }
200:                return size;
201:            }
202:
203:            /**
204:             * Puts the content of this field into the given byte vector.
205:             * 
206:             * @param out where the content of this field must be put.
207:             */
208:            void put(final ByteVector out) {
209:                out.putShort(this .access).putShort(this .name).putShort(
210:                        this .desc);
211:                int attributeCount = 0;
212:                if (this .value != 0) {
213:                    ++attributeCount;
214:                }
215:                if ((this .access & Opcodes.ACC_SYNTHETIC) != 0
216:                        && (this .cw.version & 0xffff) < Opcodes.V1_5) {
217:                    ++attributeCount;
218:                }
219:                if ((this .access & Opcodes.ACC_DEPRECATED) != 0) {
220:                    ++attributeCount;
221:                }
222:                if (this .cw.version == Opcodes.V1_4
223:                        && (this .access & Opcodes.ACC_ENUM) != 0) {
224:                    ++attributeCount;
225:                }
226:                if (this .signature != 0) {
227:                    ++attributeCount;
228:                }
229:                if (this .anns != null) {
230:                    ++attributeCount;
231:                }
232:                if (this .ianns != null) {
233:                    ++attributeCount;
234:                }
235:                if (this .attrs != null) {
236:                    attributeCount += this .attrs.getCount();
237:                }
238:                out.putShort(attributeCount);
239:                if (this .value != 0) {
240:                    out.putShort(this .cw.newUTF8("ConstantValue"));
241:                    out.putInt(2).putShort(this .value);
242:                }
243:                if ((this .access & Opcodes.ACC_SYNTHETIC) != 0
244:                        && (this .cw.version & 0xffff) < Opcodes.V1_5) {
245:                    out.putShort(this .cw.newUTF8("Synthetic")).putInt(0);
246:                }
247:                if ((this .access & Opcodes.ACC_DEPRECATED) != 0) {
248:                    out.putShort(this .cw.newUTF8("Deprecated")).putInt(0);
249:                }
250:                if (this .cw.version == Opcodes.V1_4
251:                        && (this .access & Opcodes.ACC_ENUM) != 0) {
252:                    out.putShort(this .cw.newUTF8("Enum")).putInt(0);
253:                }
254:                if (this .signature != 0) {
255:                    out.putShort(this .cw.newUTF8("Signature"));
256:                    out.putInt(2).putShort(this .signature);
257:                }
258:                if (this .anns != null) {
259:                    out.putShort(this .cw.newUTF8("RuntimeVisibleAnnotations"));
260:                    this .anns.put(out);
261:                }
262:                if (this .ianns != null) {
263:                    out
264:                            .putShort(this .cw
265:                                    .newUTF8("RuntimeInvisibleAnnotations"));
266:                    this .ianns.put(out);
267:                }
268:                if (this .attrs != null) {
269:                    this .attrs.put(this .cw, null, 0, -1, -1, out);
270:                }
271:            }
272:        }
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