JarCastingspring-context-template
This library provides a templating mechanism for creating XML-based Spring context definitions. It is heavily based on the spring-import-template library by Gildas Cuisinier.
Introduction
We are, especially when using spring-batch, very often defining a large number of very similar beans in the spring context. This violates the DRY-principle and makes maintenance sometimes a nightmare. The spring-context-tmeplate library helps to avoid most of the boilerplate code:
context-reader.xml
<?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:template="http://www.github.bom/markusbernhardt/schema/context-template"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.github.bom/markusbernhardt/schema/context-template
http://www.github.bom/markusbernhardt/schema/context-template/spring-context-template.xsd">
<template:import resource="classpath:context-reader-template.xml"
name="record-type" value="person" />
<template:import resource="classpath:context-reader-template.xml"
name="record-type" value="address" />
<template:import resource="classpath:context-reader-template.xml"
name="record-type" value="contract" />
</beans>
context-reader-template.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- template -->
<bean id="${record-type}Reader" class="org.springframework.batch.item.file.FlatFileItemReader">
<property name="lineMapper" ref="${record-type}LineMapper"/>
<property name="resource" value="${${record-type}-input-file}"/>
</bean>
<bean id="${record-type}LineMapper" class="org.springframework.batch.item.file.mapping.DefaultLineMapper">
<property name="lineTokenizer" ref="${record-type}LineTokenizer"/>
<property name="fieldSetMapper" ref="${record-type}FieldSetMapper"/>
</bean>
<bean id="${record-type}LineTokenizer" class="org.springframework.batch.item.file.transform.DelimitedLineTokenizer">
<property name="delimiter" value="${${record-type}-input-file-delimiter}"/>
<property name="names" value="${${record-type}-input-file-field-names}"/>
</bean>
<bean id="${record-type}FieldSetMapper" class="org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper">
<property name="targetType" value="${${record-type}-bean-type}"/>
</bean>
</beans>
Without this library you would have to define all beans by hand:
context-reader.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- person -->
<bean id="personReader" class="org.springframework.batch.item.file.FlatFileItemReader">
<property name="lineMapper" ref="personLineMapper"/>
<property name="resource" value="${person-input-file}"/>
</bean>
<bean id="personLineMapper" class="org.springframework.batch.item.file.mapping.DefaultLineMapper">
<property name="lineTokenizer" ref="personLineTokenizer"/>
<property name="fieldSetMapper" ref="personFieldSetMapper"/>
</bean>
<bean id="personLineTokenizer" class="org.springframework.batch.item.file.transform.DelimitedLineTokenizer">
<property name="delimiter" value="${person-input-file-delimiter}"/>
<property name="names" value="${person-input-file-field-names}"/>
</bean>
<bean id="personFieldSetMapper" class="org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper">
<property name="targetType" value="${person-bean-type}"/>
</bean>
<!-- address -->
<bean id="addressReader" class="org.springframework.batch.item.file.FlatFileItemReader">
<property name="lineMapper" ref="addressLineMapper"/>
<property name="resource" value="${address-input-file}"/>
</bean>
<bean id="addressLineMapper" class="org.springframework.batch.item.file.mapping.DefaultLineMapper">
<property name="lineTokenizer" ref="addressLineTokenizer"/>
<property name="fieldSetMapper" ref="addressFieldSetMapper"/>
</bean>
<bean id="addressLineTokenizer" class="org.springframework.batch.item.file.transform.DelimitedLineTokenizer">
<property name="delimiter" value="${address-input-file-delimiter}"/>
<property name="names" value="${address-input-file-field-names}"/>
</bean>
<bean id="addressFieldSetMapper" class="org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper">
<property name="targetType" value="${address-bean-type}"/>
</bean>
<!-- contract -->
<bean id="contractReader" class="org.springframework.batch.item.file.FlatFileItemReader">
<property name="lineMapper" ref="contractLineMapper"/>
<property name="resource" value="${contract-input-file}"/>
</bean>
<bean id="contractLineMapper" class="org.springframework.batch.item.file.mapping.DefaultLineMapper">
<property name="lineTokenizer" ref="contractLineTokenizer"/>
<property name="fieldSetMapper" ref="contractFieldSetMapper"/>
</bean>
<bean id="contractLineTokenizer" class="org.springframework.batch.item.file.transform.DelimitedLineTokenizer">
<property name="delimiter" value="${contract-input-file-delimiter}"/>
<property name="names" value="${contract-input-file-field-names}"/>
</bean>
<bean id="contractFieldSetMapper" class="org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper">
<property name="targetType" value="${contract-bean-type}"/>
</bean>
</beans>
Dependencies
If you are using maven, you can use this library by adding the following dependency to your pom.xml:
<dependency>
<groupId>com.github.markusbernhardt</groupId>
<artifactId>spring-context-template</artifactId>
<version>1.0.4</version>
</dependency>
Without maven you can use this jar and provide all required libraries from this list on your own.