Source Code Cross Referenced for PropertyOverrideConfigurer.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 2002-2005 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.util.Collections;
020:        import java.util.Enumeration;
021:        import java.util.HashSet;
022:        import java.util.Properties;
023:        import java.util.Set;
024:
025:        import org.springframework.beans.BeansException;
026:        import org.springframework.beans.factory.BeanInitializationException;
027:
028:        /**
029:         * A property resource configurer that overrides bean property values in an application
030:         * context definition. It <i>pushes</i> values from a properties file into bean definitions.
031:         *
032:         * <p>Configuration lines are expected to be of the following form:
033:         *
034:         * <pre class="code">beanName.property=value</pre>
035:         *
036:         * Example properties file:
037:         *
038:         * <pre class="code">dataSource.driverClassName=com.mysql.jdbc.Driver
039:         * dataSource.url=jdbc:mysql:mydb</pre>
040:         *
041:         * In contrast to PropertyPlaceholderConfigurer, the original definition can have default
042:         * values or no values at all for such bean properties. If an overriding properties file does
043:         * not have an entry for a certain bean property, the default context definition is used.
044:         *
045:         * <p>Note that the context definition <i>is not</i> aware of being overridden;
046:         * so this is not immediately obvious when looking at the XML definition file.
047:         *
048:         * <p>In case of multiple PropertyOverrideConfigurers that define different values for
049:         * the same bean property, the <i>last</i> one will win (due to the overriding mechanism).
050:         *
051:         * <p>Property values can be converted after reading them in, through overriding
052:         * the <code>convertPropertyValue</code> method. For example, encrypted values
053:         * can be detected and decrypted accordingly before processing them.
054:         *
055:         * @author Juergen Hoeller
056:         * @author Rod Johnson
057:         * @since 12.03.2003
058:         * @see #convertPropertyValue
059:         * @see PropertyPlaceholderConfigurer
060:         */
061:        public class PropertyOverrideConfigurer extends
062:                PropertyResourceConfigurer {
063:
064:            public static final String DEFAULT_BEAN_NAME_SEPARATOR = ".";
065:
066:            private String beanNameSeparator = DEFAULT_BEAN_NAME_SEPARATOR;
067:
068:            private boolean ignoreInvalidKeys = false;
069:
070:            /** Contains names of beans that have overrides */
071:            private Set beanNames = Collections.synchronizedSet(new HashSet());
072:
073:            /**
074:             * Set the separator to expect between bean name and property path.
075:             * Default is a dot (".").
076:             */
077:            public void setBeanNameSeparator(String beanNameSeparator) {
078:                this .beanNameSeparator = beanNameSeparator;
079:            }
080:
081:            /**
082:             * Set whether to ignore invalid keys. Default is "false".
083:             * <p>If you ignore invalid keys, keys that do not follow the
084:             * 'beanName.property' format will just be logged as warning.
085:             * This allows to have arbitrary other keys in a properties file.
086:             */
087:            public void setIgnoreInvalidKeys(boolean ignoreInvalidKeys) {
088:                this .ignoreInvalidKeys = ignoreInvalidKeys;
089:            }
090:
091:            protected void processProperties(
092:                    ConfigurableListableBeanFactory beanFactory,
093:                    Properties props) throws BeansException {
094:
095:                for (Enumeration names = props.propertyNames(); names
096:                        .hasMoreElements();) {
097:                    String key = (String) names.nextElement();
098:                    try {
099:                        processKey(beanFactory, key, props.getProperty(key));
100:                    } catch (BeansException ex) {
101:                        String msg = "Could not process key '" + key
102:                                + "' in PropertyOverrideConfigurer";
103:                        if (!this .ignoreInvalidKeys) {
104:                            throw new BeanInitializationException(msg, ex);
105:                        }
106:                        if (logger.isDebugEnabled()) {
107:                            logger.debug(msg, ex);
108:                        }
109:                    }
110:                }
111:            }
112:
113:            /**
114:             * Process the given key as 'beanName.property' entry.
115:             */
116:            protected void processKey(ConfigurableListableBeanFactory factory,
117:                    String key, String value) throws BeansException {
118:
119:                int separatorIndex = key.indexOf(this .beanNameSeparator);
120:                if (separatorIndex == -1) {
121:                    throw new BeanInitializationException("Invalid key '" + key
122:                            + "': expected 'beanName" + this .beanNameSeparator
123:                            + "property'");
124:                }
125:                String beanName = key.substring(0, separatorIndex);
126:                String beanProperty = key.substring(separatorIndex + 1);
127:                this .beanNames.add(beanName);
128:                applyPropertyValue(factory, beanName, beanProperty, value);
129:                if (logger.isDebugEnabled()) {
130:                    logger.debug("Property '" + key + "' set to value ["
131:                            + value + "]");
132:                }
133:            }
134:
135:            /**
136:             * Apply the given property value to the corresponding bean.
137:             */
138:            protected void applyPropertyValue(
139:                    ConfigurableListableBeanFactory factory, String beanName,
140:                    String property, String value) {
141:
142:                BeanDefinition bd = factory.getBeanDefinition(beanName);
143:                bd.getPropertyValues().addPropertyValue(property, value);
144:            }
145:
146:            /**
147:             * Were there overrides for this bean?
148:             * Only valid after processing has occurred at least once.
149:             * @param beanName name of the bean to query status for
150:             * @return whether there were property overrides for
151:             * the named bean
152:             */
153:            public boolean hasPropertyOverridesFor(String beanName) {
154:                return this.beanNames.contains(beanName);
155:            }
156:
157:        }
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