Source Code Cross Referenced for ArgumentConvertingMethodInvoker.java in  » J2EE » spring-framework-2.5 » org » springframework » beans » support » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.beans.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.beans.support;
018:
019:        import java.beans.PropertyEditor;
020:        import java.lang.reflect.Method;
021:
022:        import org.springframework.beans.PropertyEditorRegistry;
023:        import org.springframework.beans.SimpleTypeConverter;
024:        import org.springframework.beans.TypeConverter;
025:        import org.springframework.beans.TypeMismatchException;
026:        import org.springframework.util.ClassUtils;
027:        import org.springframework.util.MethodInvoker;
028:
029:        /**
030:         * Subclass of MethodInvoker that tries to convert the given arguments
031:         * for the actual target method via BeanWrapperImpl.
032:         *
033:         * <p>Supports flexible argument conversions, in particular for
034:         * invoking a specific overloaded method.
035:         *
036:         * @author Juergen Hoeller
037:         * @since 1.1
038:         * @see org.springframework.beans.BeanWrapperImpl#convertIfNecessary
039:         */
040:        public class ArgumentConvertingMethodInvoker extends MethodInvoker {
041:
042:            private TypeConverter typeConverter;
043:
044:            private boolean useDefaultConverter = true;
045:
046:            /**
047:             * Set a TypeConverter to use for argument type conversion.
048:             * <p>Default is a {@link org.springframework.beans.SimpleTypeConverter}.
049:             * Can be overridden with any TypeConverter implementation, typically
050:             * a pre-configured SimpleTypeConverter or a BeanWrapperImpl instance.
051:             * @see org.springframework.beans.SimpleTypeConverter
052:             * @see org.springframework.beans.BeanWrapperImpl
053:             */
054:            public void setTypeConverter(TypeConverter typeConverter) {
055:                this .typeConverter = typeConverter;
056:                this .useDefaultConverter = false;
057:            }
058:
059:            /**
060:             * Return the TypeConverter used for argument type conversion.
061:             * <p>Can be cast to {@link org.springframework.beans.PropertyEditorRegistry}
062:             * if direct access to the underlying PropertyEditors is desired
063:             * (provided that the present TypeConverter actually implements the
064:             * PropertyEditorRegistry interface).
065:             */
066:            public TypeConverter getTypeConverter() {
067:                if (this .typeConverter == null && this .useDefaultConverter) {
068:                    this .typeConverter = getDefaultTypeConverter();
069:                }
070:                return this .typeConverter;
071:            }
072:
073:            /**
074:             * Obtain the default TypeConverter for this method invoker.
075:             * <p>Called if no explicit TypeConverter has been specified.
076:             * The default implementation builds a
077:             * {@link org.springframework.beans.SimpleTypeConverter}.
078:             * Can be overridden in subclasses.
079:             */
080:            protected TypeConverter getDefaultTypeConverter() {
081:                return new SimpleTypeConverter();
082:            }
083:
084:            /**
085:             * Register the given custom property editor for all properties of the given type.
086:             * <p>Typically used in conjunction with the default
087:             * {@link org.springframework.beans.SimpleTypeConverter}; will work with any
088:             * TypeConverter that implements the PropertyEditorRegistry interface as well.
089:             * @param requiredType type of the property
090:             * @param propertyEditor editor to register
091:             * @see #setTypeConverter
092:             * @see org.springframework.beans.PropertyEditorRegistry#registerCustomEditor
093:             */
094:            public void registerCustomEditor(Class requiredType,
095:                    PropertyEditor propertyEditor) {
096:                TypeConverter converter = getTypeConverter();
097:                if (!(converter instanceof  PropertyEditorRegistry)) {
098:                    throw new IllegalStateException(
099:                            "TypeConverter does not implement PropertyEditorRegistry interface: "
100:                                    + converter);
101:                }
102:                ((PropertyEditorRegistry) converter).registerCustomEditor(
103:                        requiredType, propertyEditor);
104:            }
105:
106:            /**
107:             * This implementation looks for a method with matching parameter types:
108:             * that is, where each argument value is assignable to the corresponding parameter type.
109:             */
110:            protected Method findMatchingMethod() {
111:                Method[] candidates = getTargetClass().getMethods();
112:                Object[] arguments = getArguments();
113:                int argCount = arguments.length;
114:
115:                // First pass: look for method with directly assignable arguments.
116:                for (int i = 0; i < candidates.length; i++) {
117:                    if (candidates[i].getName().equals(getTargetMethod())) {
118:                        // Check if the inspected method has the correct number of parameters.
119:                        Class[] paramTypes = candidates[i].getParameterTypes();
120:                        if (paramTypes.length == argCount) {
121:                            int numberOfCorrectArguments = 0;
122:                            for (int j = 0; j < argCount; j++) {
123:                                // Verify that the supplied argument is assignable to the method parameter.
124:                                if (ClassUtils.isAssignableValue(paramTypes[j],
125:                                        arguments[j])) {
126:                                    numberOfCorrectArguments++;
127:                                }
128:                            }
129:                            if (numberOfCorrectArguments == argCount) {
130:                                return candidates[i];
131:                            }
132:                        }
133:                    }
134:                }
135:
136:                // Second pass: look for method where arguments can be converted to parameter types.
137:                TypeConverter converter = getTypeConverter();
138:                if (converter != null) {
139:                    for (int i = 0; i < candidates.length; i++) {
140:                        if (candidates[i].getName().equals(getTargetMethod())) {
141:                            // Check if the inspected method has the correct number of parameters.
142:                            Class[] paramTypes = candidates[i]
143:                                    .getParameterTypes();
144:                            if (paramTypes.length == argCount) {
145:                                Object[] argumentsToUse = new Object[argCount];
146:                                int numberOfCorrectArguments = 0;
147:                                for (int j = 0; j < argCount; j++) {
148:                                    // Verify that the supplied argument is assignable to the method parameter.
149:                                    try {
150:                                        argumentsToUse[j] = converter
151:                                                .convertIfNecessary(
152:                                                        arguments[j],
153:                                                        paramTypes[j]);
154:                                        numberOfCorrectArguments++;
155:                                    } catch (TypeMismatchException ex) {
156:                                        // Ignore -> simply doesn't match.
157:                                    }
158:                                }
159:                                if (numberOfCorrectArguments == argumentsToUse.length) {
160:                                    setArguments(argumentsToUse);
161:                                    return candidates[i];
162:                                }
163:                            }
164:                        }
165:                    }
166:                }
167:
168:                return null;
169:            }
170:
171:        }
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