Source Code Cross Referenced for AbstractMethodDefinitionSource.java in  » Security » acegi-security » org » acegisecurity » intercept » method » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Security » acegi security » org.acegisecurity.intercept.method 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
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:
016:        package org.acegisecurity.intercept.method;
017:
018:        import org.acegisecurity.ConfigAttributeDefinition;
019:
020:        import org.aopalliance.intercept.MethodInvocation;
021:
022:        import org.apache.commons.logging.Log;
023:        import org.apache.commons.logging.LogFactory;
024:
025:        import org.aspectj.lang.JoinPoint;
026:        import org.aspectj.lang.reflect.CodeSignature;
027:
028:        import org.springframework.util.Assert;
029:
030:        import java.lang.reflect.Method;
031:
032:        /**
033:         * Abstract implementation of <Code>MethodDefinitionSource</code>.
034:         *
035:         * @author Ben Alex
036:         * @version $Id: AbstractMethodDefinitionSource.java 1496 2006-05-23 13:38:33Z benalex $
037:         */
038:        public abstract class AbstractMethodDefinitionSource implements 
039:                MethodDefinitionSource {
040:            //~ Static fields/initializers =====================================================================================
041:
042:            private static final Log logger = LogFactory
043:                    .getLog(AbstractMethodDefinitionSource.class);
044:
045:            //~ Methods ========================================================================================================
046:
047:            public ConfigAttributeDefinition getAttributes(Object object)
048:                    throws IllegalArgumentException {
049:                Assert.notNull(object, "Object cannot be null");
050:
051:                if (object instanceof  MethodInvocation) {
052:                    return this .lookupAttributes(((MethodInvocation) object)
053:                            .getMethod());
054:                }
055:
056:                if (object instanceof  JoinPoint) {
057:                    JoinPoint jp = (JoinPoint) object;
058:                    Class targetClazz = jp.getTarget().getClass();
059:                    String targetMethodName = jp.getStaticPart().getSignature()
060:                            .getName();
061:                    Class[] types = ((CodeSignature) jp.getStaticPart()
062:                            .getSignature()).getParameterTypes();
063:
064:                    if (logger.isDebugEnabled()) {
065:                        logger.debug("Target Class: " + targetClazz);
066:                        logger.debug("Target Method Name: " + targetMethodName);
067:
068:                        for (int i = 0; i < types.length; i++) {
069:                            if (logger.isDebugEnabled()) {
070:                                logger.debug("Target Method Arg #" + i + ": "
071:                                        + types[i]);
072:                            }
073:                        }
074:                    }
075:
076:                    try {
077:                        return this .lookupAttributes(targetClazz.getMethod(
078:                                targetMethodName, types));
079:                    } catch (NoSuchMethodException nsme) {
080:                        throw new IllegalArgumentException(
081:                                "Could not obtain target method from JoinPoint: "
082:                                        + jp);
083:                    }
084:                }
085:
086:                throw new IllegalArgumentException(
087:                        "Object must be a MethodInvocation or JoinPoint");
088:            }
089:
090:            /**
091:             * Performs the actual lookup of the relevant <code>ConfigAttributeDefinition</code> for the specified
092:             * <code>Method</code> which is subject of the method invocation.<P>Provided so subclasses need only to
093:             * provide one basic method to properly interface with the <code>MethodDefinitionSource</code>.</p>
094:             *  <p>Returns <code>null</code> if there are no matching attributes for the method.</p>
095:             *
096:             * @param method the method being invoked for which configuration attributes should be looked up
097:             *
098:             * @return the <code>ConfigAttributeDefinition</code> that applies to the specified <code>Method</code>
099:             */
100:            protected abstract ConfigAttributeDefinition lookupAttributes(
101:                    Method method);
102:
103:            public boolean supports(Class clazz) {
104:                return (MethodInvocation.class.isAssignableFrom(clazz) || JoinPoint.class
105:                        .isAssignableFrom(clazz));
106:            }
107:        }
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