Source Code Cross Referenced for Attribute.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:         * A non standard class, field, method or code attribute.
033:         * 
034:         * @author Eric Bruneton
035:         * @author Eugene Kuleshov
036:         */
037:        public class Attribute {
038:
039:            /**
040:             * The type of this attribute.
041:             */
042:            public final String type;
043:
044:            /**
045:             * The raw value of this attribute, used only for unknown attributes.
046:             */
047:            byte[] value;
048:
049:            /**
050:             * The next attribute in this attribute list. May be <tt>null</tt>.
051:             */
052:            Attribute next;
053:
054:            /**
055:             * Constructs a new empty attribute.
056:             * 
057:             * @param type the type of the attribute.
058:             */
059:            protected Attribute(final String type) {
060:                this .type = type;
061:            }
062:
063:            /**
064:             * Returns <tt>true</tt> if this type of attribute is unknown. The default
065:             * implementation of this method always returns <tt>true</tt>.
066:             * 
067:             * @return <tt>true</tt> if this type of attribute is unknown.
068:             */
069:            public boolean isUnknown() {
070:                return true;
071:            }
072:
073:            /**
074:             * Returns <tt>true</tt> if this type of attribute is a code attribute.
075:             * 
076:             * @return <tt>true</tt> if this type of attribute is a code attribute.
077:             */
078:            public boolean isCodeAttribute() {
079:                return false;
080:            }
081:
082:            /**
083:             * Returns the labels corresponding to this attribute.
084:             * 
085:             * @return the labels corresponding to this attribute, or <tt>null</tt> if
086:             *         this attribute is not a code attribute that contains labels.
087:             */
088:            protected Label[] getLabels() {
089:                return null;
090:            }
091:
092:            /**
093:             * Reads a {@link #type type} attribute. This method must return a <i>new</i>
094:             * {@link Attribute} object, of type {@link #type type}, corresponding to
095:             * the <tt>len</tt> bytes starting at the given offset, in the given class
096:             * reader.
097:             * 
098:             * @param cr the class that contains the attribute to be read.
099:             * @param off index of the first byte of the attribute's content in {@link
100:             *        ClassReader#b cr.b}. The 6 attribute header bytes, containing the
101:             *        type and the length of the attribute, are not taken into account
102:             *        here.
103:             * @param len the length of the attribute's content.
104:             * @param buf buffer to be used to call
105:             *        {@link ClassReader#readUTF8 readUTF8},
106:             *        {@link ClassReader#readClass(int,char[]) readClass} or
107:             *        {@link ClassReader#readConst readConst}.
108:             * @param codeOff index of the first byte of code's attribute content in
109:             *        {@link ClassReader#b cr.b}, or -1 if the attribute to be read is
110:             *        not a code attribute. The 6 attribute header bytes, containing the
111:             *        type and the length of the attribute, are not taken into account
112:             *        here.
113:             * @param labels the labels of the method's code, or <tt>null</tt> if the
114:             *        attribute to be read is not a code attribute.
115:             * @return a <i>new</i> {@link Attribute} object corresponding to the given
116:             *         bytes.
117:             */
118:            protected Attribute read(final ClassReader cr, final int off,
119:                    final int len, final char[] buf, final int codeOff,
120:                    final Label[] labels) {
121:                final Attribute attr = new Attribute(this .type);
122:                attr.value = new byte[len];
123:                System.arraycopy(cr.b, off, attr.value, 0, len);
124:                return attr;
125:            }
126:
127:            /**
128:             * Returns the byte array form of this attribute.
129:             * 
130:             * @param cw the class to which this attribute must be added. This parameter
131:             *        can be used to add to the constant pool of this class the items
132:             *        that corresponds to this attribute.
133:             * @param code the bytecode of the method corresponding to this code
134:             *        attribute, or <tt>null</tt> if this attribute is not a code
135:             *        attributes.
136:             * @param len the length of the bytecode of the method corresponding to this
137:             *        code attribute, or <tt>null</tt> if this attribute is not a code
138:             *        attribute.
139:             * @param maxStack the maximum stack size of the method corresponding to
140:             *        this code attribute, or -1 if this attribute is not a code
141:             *        attribute.
142:             * @param maxLocals the maximum number of local variables of the method
143:             *        corresponding to this code attribute, or -1 if this attribute is
144:             *        not a code attribute.
145:             * @return the byte array form of this attribute.
146:             */
147:            protected ByteVector write(final ClassWriter cw, final byte[] code,
148:                    final int len, final int maxStack, final int maxLocals) {
149:                final ByteVector v = new ByteVector();
150:                v.data = this .value;
151:                v.length = this .value.length;
152:                return v;
153:            }
154:
155:            /**
156:             * Returns the length of the attribute list that begins with this attribute.
157:             * 
158:             * @return the length of the attribute list that begins with this attribute.
159:             */
160:            final int getCount() {
161:                int count = 0;
162:                Attribute attr = this ;
163:                while (attr != null) {
164:                    count += 1;
165:                    attr = attr.next;
166:                }
167:                return count;
168:            }
169:
170:            /**
171:             * Returns the size of all the attributes in this attribute list.
172:             * 
173:             * @param cw the class writer to be used to convert the attributes into byte
174:             *        arrays, with the {@link #write write} method.
175:             * @param code the bytecode of the method corresponding to these code
176:             *        attributes, or <tt>null</tt> if these attributes are not code
177:             *        attributes.
178:             * @param len the length of the bytecode of the method corresponding to
179:             *        these code attributes, or <tt>null</tt> if these attributes are
180:             *        not code attributes.
181:             * @param maxStack the maximum stack size of the method corresponding to
182:             *        these code attributes, or -1 if these attributes are not code
183:             *        attributes.
184:             * @param maxLocals the maximum number of local variables of the method
185:             *        corresponding to these code attributes, or -1 if these attributes
186:             *        are not code attributes.
187:             * @return the size of all the attributes in this attribute list. This size
188:             *         includes the size of the attribute headers.
189:             */
190:            final int getSize(final ClassWriter cw, final byte[] code,
191:                    final int len, final int maxStack, final int maxLocals) {
192:                Attribute attr = this ;
193:                int size = 0;
194:                while (attr != null) {
195:                    cw.newUTF8(attr.type);
196:                    size += attr.write(cw, code, len, maxStack, maxLocals).length + 6;
197:                    attr = attr.next;
198:                }
199:                return size;
200:            }
201:
202:            /**
203:             * Writes all the attributes of this attribute list in the given byte
204:             * vector.
205:             * 
206:             * @param cw the class writer to be used to convert the attributes into byte
207:             *        arrays, with the {@link #write write} method.
208:             * @param code the bytecode of the method corresponding to these code
209:             *        attributes, or <tt>null</tt> if these attributes are not code
210:             *        attributes.
211:             * @param len the length of the bytecode of the method corresponding to
212:             *        these code attributes, or <tt>null</tt> if these attributes are
213:             *        not code attributes.
214:             * @param maxStack the maximum stack size of the method corresponding to
215:             *        these code attributes, or -1 if these attributes are not code
216:             *        attributes.
217:             * @param maxLocals the maximum number of local variables of the method
218:             *        corresponding to these code attributes, or -1 if these attributes
219:             *        are not code attributes.
220:             * @param out where the attributes must be written.
221:             */
222:            final void put(final ClassWriter cw, final byte[] code,
223:                    final int len, final int maxStack, final int maxLocals,
224:                    final ByteVector out) {
225:                Attribute attr = this ;
226:                while (attr != null) {
227:                    final ByteVector b = attr.write(cw, code, len, maxStack,
228:                            maxLocals);
229:                    out.putShort(cw.newUTF8(attr.type)).putInt(b.length);
230:                    out.putByteArray(b.data, 0, b.length);
231:                    attr = attr.next;
232:                }
233:            }
234:        }
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