Source Code Cross Referenced for AbstractHandlerMapping.java in  » J2EE » spring-framework-2.0.6 » org » springframework » web » servlet » handler » 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.web.servlet.handler 
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.web.servlet.handler;
018:
019:        import java.util.ArrayList;
020:        import java.util.Arrays;
021:        import java.util.List;
022:
023:        import javax.servlet.http.HttpServletRequest;
024:
025:        import org.springframework.beans.BeansException;
026:        import org.springframework.core.Ordered;
027:        import org.springframework.web.context.request.WebRequestInterceptor;
028:        import org.springframework.web.context.support.WebApplicationObjectSupport;
029:        import org.springframework.web.servlet.HandlerExecutionChain;
030:        import org.springframework.web.servlet.HandlerInterceptor;
031:        import org.springframework.web.servlet.HandlerMapping;
032:
033:        /**
034:         * Abstract base class for {@link org.springframework.web.servlet.HandlerMapping}
035:         * implementations. Supports ordering, a default handler, and handler interceptors.
036:         *
037:         * <p>Note: This base class does <i>not</i> support exposure of the
038:         * {@link #PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE}. Support for this attribute
039:         * is up to concrete subclasses, typically based on request URL mappings.
040:         *
041:         * @author Juergen Hoeller
042:         * @since 07.04.2003
043:         * @see #getHandlerInternal
044:         * @see #setDefaultHandler
045:         * @see #setInterceptors
046:         * @see org.springframework.web.servlet.HandlerInterceptor
047:         */
048:        public abstract class AbstractHandlerMapping extends
049:                WebApplicationObjectSupport implements  HandlerMapping, Ordered {
050:
051:            private int order = Integer.MAX_VALUE; // default: same as non-Ordered
052:
053:            private Object defaultHandler;
054:
055:            private final List interceptors = new ArrayList();
056:
057:            private HandlerInterceptor[] adaptedInterceptors;
058:
059:            /**
060:             * Specify the order value for this HandlerMapping bean.
061:             * <p>Default value is <code>Integer.MAX_VALUE</code>, meaning that it's non-ordered.
062:             * @see org.springframework.core.Ordered#getOrder()
063:             */
064:            public final void setOrder(int order) {
065:                this .order = order;
066:            }
067:
068:            public final int getOrder() {
069:                return this .order;
070:            }
071:
072:            /**
073:             * Set the default handler for this handler mapping.
074:             * This handler will be returned if no specific mapping was found.
075:             * <p>Default is <code>null</code>, indicating no default handler.
076:             */
077:            public void setDefaultHandler(Object defaultHandler) {
078:                this .defaultHandler = defaultHandler;
079:            }
080:
081:            /**
082:             * Return the default handler for this handler mapping,
083:             * or <code>null</code> if none.
084:             */
085:            public Object getDefaultHandler() {
086:                return this .defaultHandler;
087:            }
088:
089:            /**
090:             * Set the interceptors to apply for all handlers mapped by this handler mapping.
091:             * <p>Supported interceptor types are HandlerInterceptor and WebRequestInterceptor.
092:             * @param interceptors array of handler interceptors, or <code>null</code> if none
093:             * @see #adaptInterceptor
094:             * @see org.springframework.web.servlet.HandlerInterceptor
095:             * @see org.springframework.web.context.request.WebRequestInterceptor
096:             */
097:            public void setInterceptors(Object[] interceptors) {
098:                this .interceptors.addAll(Arrays.asList(interceptors));
099:            }
100:
101:            /**
102:             * Initializes the interceptors.
103:             * @see #extendInterceptors(java.util.List)
104:             * @see #initInterceptors()
105:             */
106:            protected void initApplicationContext() throws BeansException {
107:                extendInterceptors(this .interceptors);
108:                initInterceptors();
109:            }
110:
111:            /**
112:             * Extension hook that subclasses can override to register additional interceptors,
113:             * given the configured interceptors (see {@link #setInterceptors}).
114:             * <p>Will be invoked before {@link #initInterceptors()} adapts the specified
115:             * interceptors into {@link HandlerInterceptor} instances.
116:             * <p>The default implementation is empty.
117:             * @param interceptors the configured interceptor List (never <code>null</code>),
118:             * allowing to add further interceptors before as well as after the existing
119:             * interceptors
120:             */
121:            protected void extendInterceptors(List interceptors) {
122:            }
123:
124:            /**
125:             * Initialize the specified interceptors, adapting them where necessary.
126:             * @see #setInterceptors
127:             * @see #adaptInterceptor
128:             */
129:            protected void initInterceptors() {
130:                if (!this .interceptors.isEmpty()) {
131:                    this .adaptedInterceptors = new HandlerInterceptor[this .interceptors
132:                            .size()];
133:                    for (int i = 0; i < this .interceptors.size(); i++) {
134:                        Object interceptor = this .interceptors.get(i);
135:                        if (interceptor == null) {
136:                            throw new IllegalArgumentException("Entry number "
137:                                    + i + " in interceptors array is null");
138:                        }
139:                        this .adaptedInterceptors[i] = adaptInterceptor(interceptor);
140:                    }
141:                }
142:            }
143:
144:            /**
145:             * Adapt the given interceptor object to the HandlerInterceptor interface.
146:             * <p>Supported interceptor types are HandlerInterceptor and WebRequestInterceptor.
147:             * Each given WebRequestInterceptor will be wrapped in a WebRequestHandlerInterceptorAdapter.
148:             * Can be overridden in subclasses.
149:             * @param interceptor the specified interceptor object
150:             * @return the interceptor wrapped as HandlerInterceptor
151:             * @see org.springframework.web.servlet.HandlerInterceptor
152:             * @see org.springframework.web.context.request.WebRequestInterceptor
153:             * @see WebRequestHandlerInterceptorAdapter
154:             */
155:            protected HandlerInterceptor adaptInterceptor(Object interceptor) {
156:                if (interceptor instanceof  HandlerInterceptor) {
157:                    return (HandlerInterceptor) interceptor;
158:                } else if (interceptor instanceof  WebRequestInterceptor) {
159:                    return new WebRequestHandlerInterceptorAdapter(
160:                            (WebRequestInterceptor) interceptor);
161:                } else {
162:                    throw new IllegalArgumentException(
163:                            "Interceptor type not supported: "
164:                                    + interceptor.getClass().getName());
165:                }
166:            }
167:
168:            /**
169:             * Return the adapted interceptors as HandlerInterceptor array.
170:             * @return the array of HandlerInterceptors, or <code>null</code> if none
171:             */
172:            protected final HandlerInterceptor[] getAdaptedInterceptors() {
173:                return this .adaptedInterceptors;
174:            }
175:
176:            /**
177:             * Look up a handler for the given request, falling back to the default
178:             * handler if no specific one is found.
179:             * @param request current HTTP request
180:             * @return the corresponding handler instance, or the default handler
181:             * @see #getHandlerInternal
182:             */
183:            public final HandlerExecutionChain getHandler(
184:                    HttpServletRequest request) throws Exception {
185:                Object handler = getHandlerInternal(request);
186:                if (handler == null) {
187:                    handler = getDefaultHandler();
188:                }
189:                if (handler == null) {
190:                    return null;
191:                }
192:                // Bean name or resolved handler?
193:                if (handler instanceof  String) {
194:                    String handlerName = (String) handler;
195:                    handler = getApplicationContext().getBean(handlerName);
196:                }
197:                return getHandlerExecutionChain(handler, request);
198:            }
199:
200:            /**
201:             * Look up a handler for the given request, returning <code>null</code> if no
202:             * specific one is found. This method is called by <code>getHandler<code>;
203:             * a <code>null</code> return value will lead to the default handler, if one is set.
204:             * @param request current HTTP request
205:             * @return the corresponding handler instance, or <code>null</code> if none found
206:             * @throws Exception if there is an internal error
207:             */
208:            protected abstract Object getHandlerInternal(
209:                    HttpServletRequest request) throws Exception;
210:
211:            /**
212:             * Build a HandlerExecutionChain for the given handler, including applicable interceptors.
213:             * <p>The default implementation simply builds a standard HandlerExecutionChain with
214:             * the given handler and this handler mapping's common interceptors. Subclasses may
215:             * override this in order to extend/rearrange the list of interceptors.
216:             * @param handler the resolved handler instance (never <code>null</code>)
217:             * @param request current HTTP request
218:             * @return the HandlerExecutionChain (never <code>null</code>)
219:             * @see #getAdaptedInterceptors()
220:             */
221:            protected HandlerExecutionChain getHandlerExecutionChain(
222:                    Object handler, HttpServletRequest request) {
223:                return new HandlerExecutionChain(handler,
224:                        getAdaptedInterceptors());
225:            }
226:
227:        }
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