Source Code Cross Referenced for PropertyResourceConfigurer.java in  » J2EE » spring-framework-2.5 » org » springframework » beans » factory » config » 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.factory.config 
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.factory.config;
018:
019:        import java.io.IOException;
020:        import java.util.Enumeration;
021:        import java.util.Properties;
022:
023:        import org.springframework.beans.BeansException;
024:        import org.springframework.beans.factory.BeanInitializationException;
025:        import org.springframework.core.Ordered;
026:        import org.springframework.core.PriorityOrdered;
027:        import org.springframework.core.io.support.PropertiesLoaderSupport;
028:        import org.springframework.util.ObjectUtils;
029:
030:        /**
031:         * Allows for configuration of individual bean property values from a property resource,
032:         * i.e. a properties file. Useful for custom config files targetted at system
033:         * administrators that override bean properties configured in the application context.
034:         *
035:         * <p>Two concrete implementations are provided in the distribution:
036:         * <ul>
037:         * <li>{@link PropertyOverrideConfigurer} for "beanName.property=value" style overriding
038:         * (<i>pushing</i> values from a properties file into bean definitions)
039:         * <li>{@link PropertyPlaceholderConfigurer} for replacing "${...}" placeholders
040:         * (<i>pulling</i> values from a properties file into bean definitions)
041:         * </ul>
042:         *
043:         * <p>Property values can be converted after reading them in, through overriding
044:         * the {@link #convertPropertyValue} method. For example, encrypted values
045:         * can be detected and decrypted accordingly before processing them.
046:         *
047:         * @author Juergen Hoeller
048:         * @since 02.10.2003
049:         * @see PropertyOverrideConfigurer
050:         * @see PropertyPlaceholderConfigurer
051:         */
052:        public abstract class PropertyResourceConfigurer extends
053:                PropertiesLoaderSupport implements  BeanFactoryPostProcessor,
054:                PriorityOrdered {
055:
056:            private int order = Ordered.LOWEST_PRECEDENCE; // default: same as non-Ordered
057:
058:            public void setOrder(int order) {
059:                this .order = order;
060:            }
061:
062:            public int getOrder() {
063:                return this .order;
064:            }
065:
066:            public void postProcessBeanFactory(
067:                    ConfigurableListableBeanFactory beanFactory)
068:                    throws BeansException {
069:                try {
070:                    Properties mergedProps = mergeProperties();
071:
072:                    // Convert the merged properties, if necessary.
073:                    convertProperties(mergedProps);
074:
075:                    // Let the subclass process the properties.
076:                    processProperties(beanFactory, mergedProps);
077:                } catch (IOException ex) {
078:                    throw new BeanInitializationException(
079:                            "Could not load properties", ex);
080:                }
081:            }
082:
083:            /**
084:             * Convert the given merged properties, converting property values
085:             * if necessary. The result will then be processed.
086:             * <p>The default implementation will invoke {@link #convertPropertyValue}
087:             * for each property value, replacing the original with the converted value.
088:             * @param props the Properties to convert
089:             * @see #processProperties
090:             */
091:            protected void convertProperties(Properties props) {
092:                Enumeration propertyNames = props.propertyNames();
093:                while (propertyNames.hasMoreElements()) {
094:                    String propertyName = (String) propertyNames.nextElement();
095:                    String propertyValue = props.getProperty(propertyName);
096:                    String convertedValue = convertPropertyValue(propertyValue);
097:                    if (!ObjectUtils.nullSafeEquals(propertyValue,
098:                            convertedValue)) {
099:                        props.setProperty(propertyName, convertedValue);
100:                    }
101:                }
102:            }
103:
104:            /**
105:             * Convert the given property value from the properties source
106:             * to the value that should be applied.
107:             * <p>The default implementation simply returns the original value.
108:             * Can be overridden in subclasses, for example to detect
109:             * encrypted values and decrypt them accordingly.
110:             * @param originalValue the original value from the properties source
111:             * (properties file or local "properties")
112:             * @return the converted value, to be used for processing
113:             * @see #setProperties
114:             * @see #setLocations
115:             * @see #setLocation
116:             */
117:            protected String convertPropertyValue(String originalValue) {
118:                return originalValue;
119:            }
120:
121:            /**
122:             * Apply the given Properties to the given BeanFactory.
123:             * @param beanFactory	the BeanFactory used by the application context
124:             * @param props the Properties to apply
125:             * @throws org.springframework.beans.BeansException in case of errors
126:             */
127:            protected abstract void processProperties(
128:                    ConfigurableListableBeanFactory beanFactory,
129:                    Properties props) throws BeansException;
130:
131:        }
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