Spring Framework example source code file (PropertyOverrideConfigurer.java)

This example Spring Framework source code file (PropertyOverrideConfigurer.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Spring Framework tags/keywords

beandefinition, beaninitializationexception, beansexception, beansexception, configurablelistablebeanfactory, default_bean_name_separator, default_bean_name_separator, invalid, properties, property, propertyoverrideconfigurer, propertyoverrideconfigurer, string, string, util

The Spring Framework PropertyOverrideConfigurer.java source code

/*
 * Copyright 2002-2008 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.beans.factory.config;

import java.util.Collections;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Properties;
import java.util.Set;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanInitializationException;

/**
 * Property resource configurer that overrides bean property values in an application
 * context definition. It <i>pushes values from a properties file into bean definitions.
 *
 * <p>Configuration lines are expected to be of the following form:
 *
 * <pre class="code">beanName.property=value

* * Example properties file: * * <pre class="code">dataSource.driverClassName=com.mysql.jdbc.Driver * dataSource.url=jdbc:mysql:mydb</pre> * * In contrast to PropertyPlaceholderConfigurer, the original definition can have default * values or no values at all for such bean properties. If an overriding properties file does * not have an entry for a certain bean property, the default context definition is used. * * <p>Note that the context definition is not aware of being overridden; * so this is not immediately obvious when looking at the XML definition file. * * <p>In case of multiple PropertyOverrideConfigurers that define different values for * the same bean property, the <i>last one will win (due to the overriding mechanism). * * <p>Property values can be converted after reading them in, through overriding * the <code>convertPropertyValue method. For example, encrypted values * can be detected and decrypted accordingly before processing them. * * @author Juergen Hoeller * @author Rod Johnson * @since 12.03.2003 * @see #convertPropertyValue * @see PropertyPlaceholderConfigurer */ public class PropertyOverrideConfigurer extends PropertyResourceConfigurer { public static final String DEFAULT_BEAN_NAME_SEPARATOR = "."; private String beanNameSeparator = DEFAULT_BEAN_NAME_SEPARATOR; private boolean ignoreInvalidKeys = false; /** Contains names of beans that have overrides */ private Set beanNames = Collections.synchronizedSet(new HashSet()); /** * Set the separator to expect between bean name and property path. * Default is a dot ("."). */ public void setBeanNameSeparator(String beanNameSeparator) { this.beanNameSeparator = beanNameSeparator; } /** * Set whether to ignore invalid keys. Default is "false". * <p>If you ignore invalid keys, keys that do not follow the * 'beanName.property' format will just be logged as warning. * This allows to have arbitrary other keys in a properties file. */ public void setIgnoreInvalidKeys(boolean ignoreInvalidKeys) { this.ignoreInvalidKeys = ignoreInvalidKeys; } protected void processProperties(ConfigurableListableBeanFactory beanFactory, Properties props) throws BeansException { for (Enumeration names = props.propertyNames(); names.hasMoreElements();) { String key = (String) names.nextElement(); try { processKey(beanFactory, key, props.getProperty(key)); } catch (BeansException ex) { String msg = "Could not process key '" + key + "' in PropertyOverrideConfigurer"; if (!this.ignoreInvalidKeys) { throw new BeanInitializationException(msg, ex); } if (logger.isDebugEnabled()) { logger.debug(msg, ex); } } } } /** * Process the given key as 'beanName.property' entry. */ protected void processKey(ConfigurableListableBeanFactory factory, String key, String value) throws BeansException { int separatorIndex = key.indexOf(this.beanNameSeparator); if (separatorIndex == -1) { throw new BeanInitializationException("Invalid key '" + key + "': expected 'beanName" + this.beanNameSeparator + "property'"); } String beanName = key.substring(0, separatorIndex); String beanProperty = key.substring(separatorIndex+1); this.beanNames.add(beanName); applyPropertyValue(factory, beanName, beanProperty, value); if (logger.isDebugEnabled()) { logger.debug("Property '" + key + "' set to value [" + value + "]"); } } /** * Apply the given property value to the corresponding bean. */ protected void applyPropertyValue( ConfigurableListableBeanFactory factory, String beanName, String property, String value) { BeanDefinition bd = factory.getBeanDefinition(beanName); while (bd.getOriginatingBeanDefinition() != null) { bd = bd.getOriginatingBeanDefinition(); } bd.getPropertyValues().addPropertyValue(property, value); } /** * Were there overrides for this bean? * Only valid after processing has occurred at least once. * @param beanName name of the bean to query status for * @return whether there were property overrides for * the named bean */ public boolean hasPropertyOverridesFor(String beanName) { return this.beanNames.contains(beanName); } }