Source Code Cross Referenced for IntroductionInfoSupport.java in  » J2EE » spring-framework-2.0.6 » org » springframework » aop » support » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.aop.support 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2007 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.aop.support;
018:
019:        import java.io.IOException;
020:        import java.io.ObjectInputStream;
021:        import java.io.Serializable;
022:        import java.util.HashSet;
023:        import java.util.Iterator;
024:        import java.util.Map;
025:        import java.util.Set;
026:
027:        import org.aopalliance.intercept.MethodInvocation;
028:        import org.apache.commons.logging.Log;
029:        import org.apache.commons.logging.LogFactory;
030:
031:        import org.springframework.aop.IntroductionInfo;
032:        import org.springframework.core.CollectionFactory;
033:        import org.springframework.util.ClassUtils;
034:
035:        /**
036:         * Support for implementations of {@link org.springframework.aop.IntroductionInfo}.
037:         *
038:         * <p>Allows subclasses to conveniently add all interfaces from a given object,
039:         * and to suppress interfaces that should not be added. Also allows for querying
040:         * all introduced interfaces.
041:         *
042:         * @author Rod Johnson
043:         * @author Juergen Hoeller
044:         */
045:        public class IntroductionInfoSupport implements  IntroductionInfo,
046:                Serializable {
047:
048:            protected transient Log logger = LogFactory.getLog(getClass());
049:
050:            /** Set of interface Classes */
051:            protected Set publishedInterfaces = new HashSet();
052:
053:            /** 
054:             * Methods that we know we should implement here: key is Method, value is Boolean.
055:             **/
056:            private transient Map rememberedMethods = createRememberedMethodMap();
057:
058:            /**
059:             * Suppress the specified interface, which may have been autodetected
060:             * due to the delegate implementing it. Call this method to exclude
061:             * internal interfaces from being visible at the proxy level.
062:             * <p>Does nothing if the interface is not implemented by the delegate.
063:             * @param intf the interface to suppress
064:             */
065:            public void suppressInterface(Class intf) {
066:                this .publishedInterfaces.remove(intf);
067:            }
068:
069:            public Class[] getInterfaces() {
070:                return (Class[]) this .publishedInterfaces
071:                        .toArray(new Class[this .publishedInterfaces.size()]);
072:            }
073:
074:            /**
075:             * Check whether the specified interfaces is a published introduction interface.
076:             * @param intf the interface to check
077:             * @return whether the interface is part of this introduction
078:             */
079:            public boolean implements Interface(Class intf) {
080:                for (Iterator it = this .publishedInterfaces.iterator(); it
081:                        .hasNext();) {
082:                    Class pubIntf = (Class) it.next();
083:                    if (intf.isInterface() && intf.isAssignableFrom(pubIntf)) {
084:                        return true;
085:                    }
086:                }
087:                return false;
088:            }
089:
090:            /**
091:             * Publish all interfaces that the given delegate implements at the proxy level.
092:             * @param delegate the delegate object
093:             */
094:            protected void implementInterfacesOnObject(Object delegate) {
095:                this .publishedInterfaces.addAll(ClassUtils
096:                        .getAllInterfacesAsSet(delegate));
097:            }
098:
099:            private Map createRememberedMethodMap() {
100:                return CollectionFactory.createIdentityMapIfPossible(32);
101:            }
102:
103:            /**
104:             * Is this method on an introduced interface?
105:             * @param mi the method invocation
106:             * @return whether the invoked method is on an introduced interface
107:             */
108:            protected final boolean isMethodOnIntroducedInterface(
109:                    MethodInvocation mi) {
110:                Boolean rememberedResult = (Boolean) this .rememberedMethods
111:                        .get(mi.getMethod());
112:                if (rememberedResult != null) {
113:                    return rememberedResult.booleanValue();
114:                } else {
115:                    // Work it out and cache it.
116:                    boolean result = implements Interface(mi.getMethod()
117:                            .getDeclaringClass());
118:                    this .rememberedMethods.put(mi.getMethod(),
119:                            (result ? Boolean.TRUE : Boolean.FALSE));
120:                    return result;
121:                }
122:            }
123:
124:            //---------------------------------------------------------------------
125:            // Serialization support
126:            //---------------------------------------------------------------------
127:
128:            /**
129:             * This method is implemented only to restore the logger.
130:             * We don't make the logger static as that would mean that subclasses
131:             * would use this class's log category.
132:             */
133:            private void readObject(ObjectInputStream ois) throws IOException,
134:                    ClassNotFoundException {
135:                // Rely on default serialization; just initialize state after deserialization.
136:                ois.defaultReadObject();
137:
138:                // Initialize transient fields.
139:                this.logger = LogFactory.getLog(getClass());
140:                this.rememberedMethods = createRememberedMethodMap();
141:            }
142:
143:        }
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