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environment-specific beans and greenhouse namespace
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Keith Donald
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Aug 26, 2010
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47 changes: 47 additions & 0 deletions
47
src/main/java/com/springsource/greenhouse/config/EnvironmentBeanDefinitionParser.java
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| package com.springsource.greenhouse.config; | ||
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| import java.util.List; | ||
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| import org.springframework.beans.factory.config.BeanDefinition; | ||
| import org.springframework.beans.factory.config.BeanDefinitionHolder; | ||
| import org.springframework.beans.factory.support.BeanDefinitionReaderUtils; | ||
| import org.springframework.beans.factory.xml.BeanDefinitionParser; | ||
| import org.springframework.beans.factory.xml.ParserContext; | ||
| import org.springframework.util.xml.DomUtils; | ||
| import org.w3c.dom.Element; | ||
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| class EnvironmentBeanDefinitionParser implements BeanDefinitionParser { | ||
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| public BeanDefinition parse(Element element, ParserContext parserContext) { | ||
| String environment = getEnvironment(parserContext); | ||
| String beanName = element.getAttribute("id"); | ||
| List<Element> whenElements = DomUtils.getChildElementsByTagName(element, "when"); | ||
| for (Element whenElement : whenElements) { | ||
| String value = whenElement.getAttribute("environment"); | ||
| if (value.equals(environment)) { | ||
| parseAndRegisterBeanDefinition(beanName, whenElement, parserContext); | ||
| return null; | ||
| } | ||
| } | ||
| Element otherwiseElement = DomUtils.getChildElementByTagName(element, "otherwise"); | ||
| if (otherwiseElement == null) { | ||
| Object source = parserContext.extractSource(element); | ||
| parserContext.getReaderContext().error("No <bean/> matched in the current environment and no <otherwise/> <bean/> is defined", source); | ||
| } | ||
| parseAndRegisterBeanDefinition(beanName, otherwiseElement, parserContext); | ||
| return null; | ||
| } | ||
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| private String getEnvironment(ParserContext context) { | ||
| return System.getProperty("environment"); | ||
| } | ||
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| private void parseAndRegisterBeanDefinition(String beanName, Element parentElement, ParserContext parserContext) { | ||
| Element beanElement = DomUtils.getChildElementByTagName(parentElement, "bean"); | ||
| BeanDefinition beanDef = parserContext.getDelegate().parseBeanDefinitionElement(beanElement, beanName, null); | ||
| BeanDefinitionHolder beanDefHolder = new BeanDefinitionHolder(beanDef, beanName); | ||
| parserContext.getDelegate().decorateBeanDefinitionIfRequired(beanElement, beanDefHolder); | ||
| BeanDefinitionReaderUtils.registerBeanDefinition(beanDefHolder, parserContext.getRegistry()); | ||
| } | ||
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| } |
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12
src/main/java/com/springsource/greenhouse/config/GreenhouseNamespaceHandler.java
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| package com.springsource.greenhouse.config; | ||
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| import org.springframework.beans.factory.xml.NamespaceHandlerSupport; | ||
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| public class GreenhouseNamespaceHandler extends NamespaceHandlerSupport { | ||
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| public void init() { | ||
| registerBeanDefinitionParser("environment-bean", new EnvironmentBeanDefinitionParser()); | ||
| } | ||
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| } | ||
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| @@ -0,0 +1 @@ | ||
| http\://www.springsource.com/schema/greenhouse=com.springsource.greenhouse.config.GreenhouseNamespaceHandler |
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| http\://www.springsource.com/schema/greenhouse/greenhouse-1.0.xsd=com/springsource/greenhouse/config/greenhouse-1.0.xsd |
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70
src/main/resources/com/springsource/greenhouse/config/greenhouse-1.0.xsd
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| <?xml version="1.0" encoding="UTF-8" ?> | ||
| <xsd:schema xmlns="http://www.springsource.com/schema/greenhouse" | ||
| xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:beans="http://www.springframework.org/schema/beans" | ||
| xmlns:tool="http://www.springframework.org/schema/tool" | ||
| targetNamespace="http://www.springsource.com/schema/greenhouse" | ||
| elementFormDefault="qualified" attributeFormDefault="unqualified"> | ||
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| <xsd:import namespace="http://www.springframework.org/schema/beans" schemaLocation="http://www.springframework.org/schema/beans/spring-beans-3.0.xsd" /> | ||
| <xsd:import namespace="http://www.springframework.org/schema/tool" schemaLocation="http://www.springframework.org/schema/tool/spring-tool-3.0.xsd" /> | ||
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| <xsd:element name="environment-bean"> | ||
| <xsd:annotation> | ||
| <xsd:documentation><![CDATA[ | ||
| ]]></xsd:documentation> | ||
| </xsd:annotation> | ||
| <xsd:complexType> | ||
| <xsd:complexContent> | ||
| <xsd:extension base="beans:identifiedType"> | ||
| <xsd:sequence> | ||
| <xsd:element name="when"> | ||
| <xsd:annotation> | ||
| <xsd:documentation><![CDATA[ | ||
| ]]></xsd:documentation> | ||
| </xsd:annotation> | ||
| <xsd:complexType> | ||
| <xsd:choice> | ||
| <xsd:element ref="beans:bean"> | ||
| <xsd:annotation> | ||
| <xsd:documentation><![CDATA[ | ||
| ]]></xsd:documentation> | ||
| </xsd:annotation> | ||
| </xsd:element> | ||
| </xsd:choice> | ||
| <xsd:attribute name="environment" type="xsd:string" use="required"> | ||
| <xsd:annotation> | ||
| <xsd:documentation><![CDATA[ | ||
| ]]></xsd:documentation> | ||
| </xsd:annotation> | ||
| </xsd:attribute> | ||
| </xsd:complexType> | ||
| </xsd:element> | ||
| <xsd:element name="otherwise"> | ||
| <xsd:annotation> | ||
| <xsd:documentation><![CDATA[ | ||
| ]]></xsd:documentation> | ||
| </xsd:annotation> | ||
| <xsd:complexType> | ||
| <xsd:choice> | ||
| <xsd:element ref="beans:bean"> | ||
| <xsd:annotation> | ||
| <xsd:documentation><![CDATA[ | ||
| ]]></xsd:documentation> | ||
| </xsd:annotation> | ||
| </xsd:element> | ||
| </xsd:choice> | ||
| </xsd:complexType> | ||
| </xsd:element> | ||
| </xsd:sequence> | ||
| </xsd:extension> | ||
| </xsd:complexContent> | ||
| </xsd:complexType> | ||
| </xsd:element> | ||
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| </xsd:schema> |
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21 changes: 21 additions & 0 deletions
21
src/test/java/com/springsource/greenhouse/config/EnvironmentBeanTests.java
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| package com.springsource.greenhouse.config; | ||
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| import static org.junit.Assert.assertTrue; | ||
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| import org.junit.Test; | ||
| import org.springframework.context.support.ClassPathXmlApplicationContext; | ||
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| import com.springsource.greenhouse.account.PasswordEncoder; | ||
| import com.springsource.greenhouse.account.StandardPasswordEncoder; | ||
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| public class EnvironmentBeanTests { | ||
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| private ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("com/springsource/greenhouse/config/context.xml"); | ||
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| @Test | ||
| public void testOk() { | ||
| PasswordEncoder encoder = context.getBean("passwordEncoder", PasswordEncoder.class); | ||
| assertTrue(encoder instanceof StandardPasswordEncoder); | ||
| } | ||
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| } |
20 changes: 20 additions & 0 deletions
20
src/test/java/com/springsource/greenhouse/config/context.xml
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| <?xml version="1.0" encoding="UTF-8"?> | ||
| <beans xmlns="http://www.springframework.org/schema/beans" | ||
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | ||
| xmlns:greenhouse="http://www.springsource.com/schema/greenhouse" | ||
| xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd | ||
| http://www.springsource.com/schema/greenhouse http://www.springsource.com/schema/greenhouse/greenhouse-1.0.xsd"> | ||
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| <greenhouse:environment-bean id="passwordEncoder"> | ||
| <greenhouse:when environment="dev"> | ||
| <bean class="com.springsource.greenhouse.account.NoOpPasswordEncoder" /> | ||
| </greenhouse:when> | ||
| <greenhouse:otherwise> | ||
| <bean class="com.springsource.greenhouse.account.StandardPasswordEncoder"> | ||
| <constructor-arg value="MD5" /> | ||
| <constructor-arg value="test" /> | ||
| </bean> | ||
| </greenhouse:otherwise> | ||
| </greenhouse:environment-bean> | ||
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| </beans> |