Source Code Cross Referenced for TraceAbstractVisitor.java in  » Rule-Engine » drolls-Rule-Engine » org » drools » asm » util » 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.util 
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.util;
030:
031:        import org.drools.asm.AnnotationVisitor;
032:        import org.drools.asm.Attribute;
033:        import org.drools.asm.util.attrs.Traceable;
034:
035:        /**
036:         * An abstract trace visitor.
037:         * 
038:         * @author Eric Bruneton
039:         */
040:        public abstract class TraceAbstractVisitor extends AbstractVisitor {
041:
042:            /**
043:             * Constant used in {@link #appendDescriptor appendDescriptor} for internal
044:             * type names in bytecode notation.
045:             */
046:            public final static int INTERNAL_NAME = 0;
047:
048:            /**
049:             * Constant used in {@link #appendDescriptor appendDescriptor} for field
050:             * descriptors, formatted in bytecode notation
051:             */
052:            public final static int FIELD_DESCRIPTOR = 1;
053:
054:            /**
055:             * Constant used in {@link #appendDescriptor appendDescriptor} for field
056:             * signatures, formatted in bytecode notation
057:             */
058:            public final static int FIELD_SIGNATURE = 2;
059:
060:            /**
061:             * Constant used in {@link #appendDescriptor appendDescriptor} for method
062:             * descriptors, formatted in bytecode notation
063:             */
064:            public final static int METHOD_DESCRIPTOR = 3;
065:
066:            /**
067:             * Constant used in {@link #appendDescriptor appendDescriptor} for method
068:             * signatures, formatted in bytecode notation
069:             */
070:            public final static int METHOD_SIGNATURE = 4;
071:
072:            /**
073:             * Constant used in {@link #appendDescriptor appendDescriptor} for class
074:             * signatures, formatted in bytecode notation
075:             */
076:            public final static int CLASS_SIGNATURE = 5;
077:
078:            /**
079:             * Constant used in {@link #appendDescriptor appendDescriptor} for field or
080:             * method return value signatures, formatted in default Java notation
081:             * (non-bytecode)
082:             */
083:            public final static int TYPE_DECLARATION = 6;
084:
085:            /**
086:             * Constant used in {@link #appendDescriptor appendDescriptor} for class
087:             * signatures, formatted in default Java notation (non-bytecode)
088:             */
089:            public final static int CLASS_DECLARATION = 7;
090:
091:            /**
092:             * Constant used in {@link #appendDescriptor appendDescriptor} for method
093:             * parameter signatures, formatted in default Java notation (non-bytecode)
094:             */
095:            public final static int PARAMETERS_DECLARATION = 8;
096:
097:            /**
098:             * Tab for class members.
099:             */
100:            protected String tab = "  ";
101:
102:            /**
103:             * Prints a disassembled view of the given annotation.
104:             * 
105:             * @param desc the class descriptor of the annotation class.
106:             * @param visible <tt>true</tt> if the annotation is visible at runtime.
107:             * @return a visitor to visit the annotation values.
108:             */
109:            public AnnotationVisitor visitAnnotation(final String desc,
110:                    final boolean visible) {
111:                this .buf.setLength(0);
112:                this .buf.append(this .tab).append('@');
113:                appendDescriptor(TraceAbstractVisitor.FIELD_DESCRIPTOR, desc);
114:                this .buf.append('(');
115:                this .text.add(this .buf.toString());
116:                final TraceAnnotationVisitor tav = createTraceAnnotationVisitor();
117:                this .text.add(tav.getText());
118:                this .text.add(visible ? ")\n" : ") // invisible\n");
119:                return tav;
120:            }
121:
122:            /**
123:             * Prints a disassembled view of the given attribute.
124:             * 
125:             * @param attr an attribute.
126:             */
127:            public void visitAttribute(final Attribute attr) {
128:                this .buf.setLength(0);
129:                this .buf.append(this .tab).append("ATTRIBUTE ");
130:                appendDescriptor(-1, attr.type);
131:
132:                if (attr instanceof  Traceable) {
133:                    ((Traceable) attr).trace(this .buf, null);
134:                } else {
135:                    this .buf.append(" : ").append(attr.toString()).append("\n");
136:                }
137:
138:                this .text.add(this .buf.toString());
139:            }
140:
141:            /**
142:             * Does nothing.
143:             */
144:            public void visitEnd() {
145:                // does nothing
146:            }
147:
148:            // ------------------------------------------------------------------------
149:            // Utility methods
150:            // ------------------------------------------------------------------------
151:
152:            protected TraceAnnotationVisitor createTraceAnnotationVisitor() {
153:                return new TraceAnnotationVisitor();
154:            }
155:
156:            /**
157:             * Appends an internal name, a type descriptor or a type signature to
158:             * {@link #buf buf}.
159:             * 
160:             * @param type indicates if desc is an internal name, a field descriptor, a
161:             *        method descriptor, a class signature, ...
162:             * @param desc an internal name, type descriptor, or type signature. May be
163:             *        <tt>null</tt>.
164:             */
165:            protected void appendDescriptor(final int type, final String desc) {
166:                if (type == TraceAbstractVisitor.CLASS_SIGNATURE
167:                        || type == TraceAbstractVisitor.FIELD_SIGNATURE
168:                        || type == TraceAbstractVisitor.METHOD_SIGNATURE) {
169:                    if (desc != null) {
170:                        this .buf.append("// signature ").append(desc).append(
171:                                '\n');
172:                    }
173:                } else {
174:                    this.buf.append(desc);
175:                }
176:            }
177:
178:        }
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