Source Code Cross Referenced for MethodSignature.java in  » Library » Tapestry » org » apache » tapestry » services » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Tapestry » org.apache.tapestry.services 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // Copyright 2006, 2007 The Apache Software Foundation
002:        //
003:        // Licensed under the Apache License, Version 2.0 (the "License");
004:        // you may not use this file except in compliance with the License.
005:        // You may obtain a copy of the License at
006:        //
007:        //     http://www.apache.org/licenses/LICENSE-2.0
008:        //
009:        // Unless required by applicable law or agreed to in writing, software
010:        // distributed under the License is distributed on an "AS IS" BASIS,
011:        // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012:        // See the License for the specific language governing permissions and
013:        // limitations under the License.
014:
015:        package org.apache.tapestry.services;
016:
017:        import static org.apache.tapestry.ioc.internal.util.Defense.notBlank;
018:
019:        import java.lang.reflect.Modifier;
020:
021:        /**
022:         * A representation of a method signature, which consists of its name, modifiers (primarily,
023:         * visibility), return type, parameter types, and declared exception types.
024:         * <p>
025:         * Types are stored as class names (or primitive names) because the MethodSignature is often used in
026:         * situations where the actual class has not been loaded yet. When classes are already loaded (such
027:         * as, for use with {@link org.apache.hivemind.service.ClassFab}), then a different implementation
028:         * with the same name, {@link org.apache.tapestry.ioc.services.MethodSignature} is used.
029:         */
030:        public class MethodSignature implements  Comparable<MethodSignature> {
031:            private int _hashCode = -1;
032:
033:            private final int _modifiers;
034:
035:            private final String _returnType;
036:
037:            private final String _methodName;
038:
039:            private final String[] _parameterTypes;
040:
041:            private final String[] _exceptionTypes;
042:
043:            private static final String[] EMPTY_STRINGS = new String[0];
044:
045:            /** Convienience for adding a public void method with no parameters or exception types. */
046:
047:            public MethodSignature(String name) {
048:                this (Modifier.PUBLIC, "void", name, EMPTY_STRINGS,
049:                        EMPTY_STRINGS);
050:            }
051:
052:            public MethodSignature(int modifiers, String type, String name,
053:                    String[] parameterTypes, String[] exceptionTypes) {
054:                _modifiers = modifiers;
055:
056:                _returnType = notBlank(type, "type");
057:                _methodName = notBlank(name, "name");
058:
059:                // TODO: Checks that no element within the two arrays
060:                // is null or blank.
061:
062:                _parameterTypes = typeNamesOrEmpty(parameterTypes);
063:                _exceptionTypes = typeNamesOrEmpty(exceptionTypes);
064:            }
065:
066:            private String[] typeNamesOrEmpty(String[] types) {
067:                return types == null ? EMPTY_STRINGS : types;
068:            }
069:
070:            /**
071:             * Returns a non-null array of the names of each declared exception type thrown by the method.
072:             * Calling code should not modify the array.
073:             */
074:            public String[] getExceptionTypes() {
075:                return _exceptionTypes;
076:            }
077:
078:            /** Returns the name of the method. */
079:            public String getMethodName() {
080:                return _methodName;
081:            }
082:
083:            /**
084:             * Returns the set of modifier flags for this method.
085:             * 
086:             * @see java.lang.reflect.Modifier
087:             */
088:            public int getModifiers() {
089:                return _modifiers;
090:            }
091:
092:            /**
093:             * Returns an array of the type name for each parameter. Calling code should not modify the
094:             * array.
095:             */
096:            public String[] getParameterTypes() {
097:                return _parameterTypes;
098:            }
099:
100:            /** Return the type name of the return type of the method. */
101:            public String getReturnType() {
102:                return _returnType;
103:            }
104:
105:            @Override
106:            public int hashCode() {
107:                if (_hashCode == -1) {
108:                    _hashCode = 17 * _modifiers;
109:                    _hashCode += 31 * _returnType.hashCode();
110:                    _hashCode += 31 * _methodName.hashCode();
111:
112:                    for (String parameterType : _parameterTypes) {
113:                        _hashCode += 31 * parameterType.hashCode();
114:                    }
115:
116:                    for (String exceptionType : _exceptionTypes) {
117:                        _hashCode += 31 * exceptionType.hashCode();
118:                    }
119:                }
120:
121:                return _hashCode;
122:            }
123:
124:            @Override
125:            public boolean equals(Object other) {
126:                if (other == null || !(other instanceof  MethodSignature))
127:                    return false;
128:
129:                MethodSignature ms = (MethodSignature) other;
130:
131:                return _modifiers == ms._modifiers
132:                        && _returnType.equals(ms._returnType)
133:                        && _methodName.equals(ms._methodName)
134:                        && matches(_parameterTypes, ms._parameterTypes)
135:                        && matches(_exceptionTypes, ms._exceptionTypes);
136:            }
137:
138:            private boolean matches(String[] values, String[] otherValues) {
139:                if (values.length != otherValues.length)
140:                    return false;
141:
142:                for (int i = 0; i < values.length; i++) {
143:                    if (!values[i].equals(otherValues[i]))
144:                        return false;
145:                }
146:
147:                return true;
148:            }
149:
150:            /**
151:             * Returns the long form description of the signature. This includes modifiers, return type,
152:             * method name, parameters and thrown exceptions, formatter approximately as it would appear in
153:             * Java source (except that parameter names, which are not known, do no appear).
154:             */
155:            @Override
156:            public String toString() {
157:                StringBuilder builder = new StringBuilder();
158:
159:                // Package private is simply omitted.
160:
161:                if (_modifiers != 0) {
162:                    builder.append(Modifier.toString(_modifiers));
163:                    builder.append(' ');
164:                }
165:
166:                builder.append(_returnType);
167:                builder.append(' ');
168:
169:                addMethodNameAndParameters(builder);
170:
171:                for (int i = 0; i < _exceptionTypes.length; i++) {
172:                    if (i == 0)
173:                        builder.append(" throws ");
174:                    else
175:                        builder.append(", ");
176:
177:                    builder.append(_exceptionTypes[i]);
178:                }
179:
180:                return builder.toString();
181:            }
182:
183:            private void addMethodNameAndParameters(StringBuilder builder) {
184:                builder.append(_methodName);
185:                builder.append('(');
186:
187:                for (int i = 0; i < _parameterTypes.length; i++) {
188:                    if (i > 0)
189:                        builder.append(", ");
190:
191:                    builder.append(_parameterTypes[i]);
192:                }
193:
194:                builder.append(')');
195:            }
196:
197:            /**
198:             * Sorting is primarily via method name. For methods with the same name, the second level of
199:             * sorting is by parameter count (ascending).
200:             */
201:            public int compareTo(MethodSignature o) {
202:                int result = _methodName.compareTo(o._methodName);
203:
204:                if (result == 0)
205:                    result = _parameterTypes.length - o._parameterTypes.length;
206:
207:                return result;
208:            }
209:
210:            /**
211:             * Returns a shortened form of the string representation of the method. It lists just the name
212:             * of the method and the types of any parameters, omitting return type, exceptions and
213:             * modifiers.
214:             * 
215:             * @return
216:             */
217:            public String getMediumDescription() {
218:                StringBuilder builder = new StringBuilder();
219:
220:                addMethodNameAndParameters(builder);
221:
222:                return builder.toString();
223:            }
224:
225:        }
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