Source Code Cross Referenced for SetRootRule.java in  » Sevlet-Container » apache-tomcat-6.0.14 » org » apache » tomcat » util » digester » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Sevlet Container » apache tomcat 6.0.14 » org.apache.tomcat.util.digester 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* $Id: SetRootRule.java 467222 2006-10-24 03:17:11Z markt $
002:         *
003:         * Licensed to the Apache Software Foundation (ASF) under one or more
004:         * contributor license agreements.  See the NOTICE file distributed with
005:         * this work for additional information regarding copyright ownership.
006:         * The ASF licenses this file to You under the Apache License, Version 2.0
007:         * (the "License"); you may not use this file except in compliance with
008:         * the License.  You may obtain a copy of the License at
009:         * 
010:         *      http://www.apache.org/licenses/LICENSE-2.0
011:         * 
012:         * Unless required by applicable law or agreed to in writing, software
013:         * distributed under the License is distributed on an "AS IS" BASIS,
014:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015:         * See the License for the specific language governing permissions and
016:         * limitations under the License.
017:         */
018:
019:        package org.apache.tomcat.util.digester;
020:
021:        import org.apache.tomcat.util.IntrospectionUtils;
022:
023:        /**
024:         * <p>Rule implementation that calls a method on the root object on the stack,
025:         * passing the top object (child) as an argument.
026:         * It is important to remember that this rule acts on <code>end</code>.</p>
027:         *
028:         * <p>This rule now supports more flexible method matching by default.
029:         * It is possible that this may break (some) code 
030:         * written against release 1.1.1 or earlier.
031:         * See {@link #isExactMatch()} for more details.</p>
032:         */
033:
034:        public class SetRootRule extends Rule {
035:
036:            // ----------------------------------------------------------- Constructors
037:
038:            /**
039:             * Construct a "set root" rule with the specified method name.  The
040:             * method's argument type is assumed to be the class of the
041:             * child object.
042:             *
043:             * @param digester The associated Digester
044:             * @param methodName Method name of the parent method to call
045:             *
046:             * @deprecated The digester instance is now set in the {@link Digester#addRule} method. 
047:             * Use {@link #SetRootRule(String methodName)} instead.
048:             */
049:            public SetRootRule(Digester digester, String methodName) {
050:
051:                this (methodName);
052:
053:            }
054:
055:            /**
056:             * Construct a "set root" rule with the specified method name.
057:             *
058:             * @param digester The associated Digester
059:             * @param methodName Method name of the parent method to call
060:             * @param paramType Java class of the parent method's argument
061:             *  (if you wish to use a primitive type, specify the corresonding
062:             *  Java wrapper class instead, such as <code>java.lang.Boolean</code>
063:             *  for a <code>boolean</code> parameter)
064:             *
065:             * @deprecated The digester instance is now set in the {@link Digester#addRule} method. 
066:             * Use {@link #SetRootRule(String methodName,String paramType)} instead.
067:             */
068:            public SetRootRule(Digester digester, String methodName,
069:                    String paramType) {
070:
071:                this (methodName, paramType);
072:
073:            }
074:
075:            /**
076:             * Construct a "set root" rule with the specified method name.  The
077:             * method's argument type is assumed to be the class of the
078:             * child object.
079:             *
080:             * @param methodName Method name of the parent method to call
081:             */
082:            public SetRootRule(String methodName) {
083:
084:                this (methodName, null);
085:
086:            }
087:
088:            /**
089:             * Construct a "set root" rule with the specified method name.
090:             *
091:             * @param methodName Method name of the parent method to call
092:             * @param paramType Java class of the parent method's argument
093:             *  (if you wish to use a primitive type, specify the corresonding
094:             *  Java wrapper class instead, such as <code>java.lang.Boolean</code>
095:             *  for a <code>boolean</code> parameter)
096:             */
097:            public SetRootRule(String methodName, String paramType) {
098:
099:                this .methodName = methodName;
100:                this .paramType = paramType;
101:
102:            }
103:
104:            // ----------------------------------------------------- Instance Variables
105:
106:            /**
107:             * The method name to call on the parent object.
108:             */
109:            protected String methodName = null;
110:
111:            /**
112:             * The Java class name of the parameter type expected by the method.
113:             */
114:            protected String paramType = null;
115:
116:            /**
117:             * Should we use exact matching. Default is no.
118:             */
119:            protected boolean useExactMatch = false;
120:
121:            // --------------------------------------------------------- Public Methods
122:
123:            /**
124:             * <p>Is exact matching being used.</p>
125:             *
126:             * <p>This rule uses <code>org.apache.commons.beanutils.MethodUtils</code> 
127:             * to introspect the relevent objects so that the right method can be called.
128:             * Originally, <code>MethodUtils.invokeExactMethod</code> was used.
129:             * This matches methods very strictly 
130:             * and so may not find a matching method when one exists.
131:             * This is still the behaviour when exact matching is enabled.</p>
132:             *
133:             * <p>When exact matching is disabled, <code>MethodUtils.invokeMethod</code> is used.
134:             * This method finds more methods but is less precise when there are several methods 
135:             * with correct signatures.
136:             * So, if you want to choose an exact signature you might need to enable this property.</p>
137:             *
138:             * <p>The default setting is to disable exact matches.</p>
139:             *
140:             * @return true iff exact matching is enabled
141:             * @since Digester Release 1.1.1
142:             */
143:            public boolean isExactMatch() {
144:
145:                return useExactMatch;
146:            }
147:
148:            /**
149:             * <p>Set whether exact matching is enabled.</p>
150:             *
151:             * <p>See {@link #isExactMatch()}.</p>
152:             *
153:             * @param useExactMatch should this rule use exact method matching
154:             * @since Digester Release 1.1.1
155:             */
156:            public void setExactMatch(boolean useExactMatch) {
157:
158:                this .useExactMatch = useExactMatch;
159:            }
160:
161:            /**
162:             * Process the end of this element.
163:             */
164:            public void end() throws Exception {
165:
166:                // Identify the objects to be used
167:                Object child = digester.peek(0);
168:                Object parent = digester.root;
169:                if (digester.log.isDebugEnabled()) {
170:                    if (parent == null) {
171:                        digester.log.debug("[SetRootRule]{" + digester.match
172:                                + "} Call [NULL ROOT]." + methodName + "("
173:                                + child + ")");
174:                    } else {
175:                        digester.log.debug("[SetRootRule]{" + digester.match
176:                                + "} Call " + parent.getClass().getName() + "."
177:                                + methodName + "(" + child + ")");
178:                    }
179:                }
180:
181:                // Call the specified method
182:                IntrospectionUtils.callMethod1(parent, methodName, child,
183:                        paramType, digester.getClassLoader());
184:
185:            }
186:
187:            /**
188:             * Render a printable version of this Rule.
189:             */
190:            public String toString() {
191:
192:                StringBuffer sb = new StringBuffer("SetRootRule[");
193:                sb.append("methodName=");
194:                sb.append(methodName);
195:                sb.append(", paramType=");
196:                sb.append(paramType);
197:                sb.append("]");
198:                return (sb.toString());
199:
200:            }
201:
202:        }
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