Source Code Cross Referenced for Attribute.java in  » Testing » Ejb3Unit » org » ejb3unit » asm » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » Ejb3Unit » org.ejb3unit.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.ejb3unit.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
058:             *            the type of the attribute.
059:             */
060:            protected Attribute(final String type) {
061:                this .type = type;
062:            }
063:
064:            /**
065:             * Returns <tt>true</tt> if this type of attribute is unknown. The default
066:             * implementation of this method always returns <tt>true</tt>.
067:             * 
068:             * @return <tt>true</tt> if this type of attribute is unknown.
069:             */
070:            public boolean isUnknown() {
071:                return true;
072:            }
073:
074:            /**
075:             * Returns <tt>true</tt> if this type of attribute is a code attribute.
076:             * 
077:             * @return <tt>true</tt> if this type of attribute is a code attribute.
078:             */
079:            public boolean isCodeAttribute() {
080:                return false;
081:            }
082:
083:            /**
084:             * Returns the labels corresponding to this attribute.
085:             * 
086:             * @return the labels corresponding to this attribute, or <tt>null</tt> if
087:             *         this attribute is not a code attribute that contains labels.
088:             */
089:            protected Label[] getLabels() {
090:                return null;
091:            }
092:
093:            /**
094:             * Reads a {@link #type type} attribute. This method must return a <i>new</i>
095:             * {@link Attribute} object, of type {@link #type type}, corresponding to
096:             * the <tt>len</tt> bytes starting at the given offset, in the given class
097:             * reader.
098:             * 
099:             * @param cr
100:             *            the class that contains the attribute to be read.
101:             * @param off
102:             *            index of the first byte of the attribute's content in {@link
103:             *            ClassReader#b cr.b}. The 6 attribute header bytes, containing
104:             *            the type and the length of the attribute, are not taken into
105:             *            account here.
106:             * @param len
107:             *            the length of the attribute's content.
108:             * @param buf
109:             *            buffer to be used to call
110:             *            {@link ClassReader#readUTF8 readUTF8},
111:             *            {@link ClassReader#readClass(int,char[]) readClass} or
112:             *            {@link ClassReader#readConst readConst}.
113:             * @param codeOff
114:             *            index of the first byte of code's attribute content in
115:             *            {@link ClassReader#b cr.b}, or -1 if the attribute to be read
116:             *            is not a code attribute. The 6 attribute header bytes,
117:             *            containing the type and the length of the attribute, are not
118:             *            taken into account here.
119:             * @param labels
120:             *            the labels of the method's code, or <tt>null</tt> if the
121:             *            attribute to be read is not a code attribute.
122:             * @return a <i>new</i> {@link Attribute} object corresponding to the given
123:             *         bytes.
124:             */
125:            protected Attribute read(final ClassReader cr, final int off,
126:                    final int len, final char[] buf, final int codeOff,
127:                    final Label[] labels) {
128:                Attribute attr = new Attribute(type);
129:                attr.value = new byte[len];
130:                System.arraycopy(cr.b, off, attr.value, 0, len);
131:                return attr;
132:            }
133:
134:            /**
135:             * Returns the byte array form of this attribute.
136:             * 
137:             * @param cw
138:             *            the class to which this attribute must be added. This
139:             *            parameter can be used to add to the constant pool of this
140:             *            class the items that corresponds to this attribute.
141:             * @param code
142:             *            the bytecode of the method corresponding to this code
143:             *            attribute, or <tt>null</tt> if this attribute is not a code
144:             *            attributes.
145:             * @param len
146:             *            the length of the bytecode of the method corresponding to this
147:             *            code attribute, or <tt>null</tt> if this attribute is not a
148:             *            code attribute.
149:             * @param maxStack
150:             *            the maximum stack size of the method corresponding to this
151:             *            code attribute, or -1 if this attribute is not a code
152:             *            attribute.
153:             * @param maxLocals
154:             *            the maximum number of local variables of the method
155:             *            corresponding to this code attribute, or -1 if this attribute
156:             *            is not a code attribute.
157:             * @return the byte array form of this attribute.
158:             */
159:            protected ByteVector write(final ClassWriter cw, final byte[] code,
160:                    final int len, final int maxStack, final int maxLocals) {
161:                ByteVector v = new ByteVector();
162:                v.data = value;
163:                v.length = value.length;
164:                return v;
165:            }
166:
167:            /**
168:             * Returns the length of the attribute list that begins with this attribute.
169:             * 
170:             * @return the length of the attribute list that begins with this attribute.
171:             */
172:            final int getCount() {
173:                int count = 0;
174:                Attribute attr = this ;
175:                while (attr != null) {
176:                    count += 1;
177:                    attr = attr.next;
178:                }
179:                return count;
180:            }
181:
182:            /**
183:             * Returns the size of all the attributes in this attribute list.
184:             * 
185:             * @param cw
186:             *            the class writer to be used to convert the attributes into
187:             *            byte arrays, with the {@link #write write} method.
188:             * @param code
189:             *            the bytecode of the method corresponding to these code
190:             *            attributes, or <tt>null</tt> if these attributes are not
191:             *            code attributes.
192:             * @param len
193:             *            the length of the bytecode of the method corresponding to
194:             *            these code attributes, or <tt>null</tt> if these attributes
195:             *            are not code attributes.
196:             * @param maxStack
197:             *            the maximum stack size of the method corresponding to these
198:             *            code attributes, or -1 if these attributes are not code
199:             *            attributes.
200:             * @param maxLocals
201:             *            the maximum number of local variables of the method
202:             *            corresponding to these code attributes, or -1 if these
203:             *            attributes are not code attributes.
204:             * @return the size of all the attributes in this attribute list. This size
205:             *         includes the size of the attribute headers.
206:             */
207:            final int getSize(final ClassWriter cw, final byte[] code,
208:                    final int len, final int maxStack, final int maxLocals) {
209:                Attribute attr = this ;
210:                int size = 0;
211:                while (attr != null) {
212:                    cw.newUTF8(attr.type);
213:                    size += attr.write(cw, code, len, maxStack, maxLocals).length + 6;
214:                    attr = attr.next;
215:                }
216:                return size;
217:            }
218:
219:            /**
220:             * Writes all the attributes of this attribute list in the given byte
221:             * vector.
222:             * 
223:             * @param cw
224:             *            the class writer to be used to convert the attributes into
225:             *            byte arrays, with the {@link #write write} method.
226:             * @param code
227:             *            the bytecode of the method corresponding to these code
228:             *            attributes, or <tt>null</tt> if these attributes are not
229:             *            code attributes.
230:             * @param len
231:             *            the length of the bytecode of the method corresponding to
232:             *            these code attributes, or <tt>null</tt> if these attributes
233:             *            are not code attributes.
234:             * @param maxStack
235:             *            the maximum stack size of the method corresponding to these
236:             *            code attributes, or -1 if these attributes are not code
237:             *            attributes.
238:             * @param maxLocals
239:             *            the maximum number of local variables of the method
240:             *            corresponding to these code attributes, or -1 if these
241:             *            attributes are not code attributes.
242:             * @param out
243:             *            where the attributes must be written.
244:             */
245:            final void put(final ClassWriter cw, final byte[] code,
246:                    final int len, final int maxStack, final int maxLocals,
247:                    final ByteVector out) {
248:                Attribute attr = this ;
249:                while (attr != null) {
250:                    ByteVector b = attr.write(cw, code, len, maxStack,
251:                            maxLocals);
252:                    out.putShort(cw.newUTF8(attr.type)).putInt(b.length);
253:                    out.putByteArray(b.data, 0, b.length);
254:                    attr = attr.next;
255:                }
256:            }
257:        }
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