CODEWITHSUNDEEP
javaspring
Teja
Teja

Reputation: 341

Iterating list in spring

Is there a way to iterate list or map in spring? I am not able to find any references for this online.

This is what I defined- 

<?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:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.5.xsd">


<util:list id="myList" value-type="java.lang.String">
    <value>foo</value>
    <value>bar</value>
</util:list>

<bean id="bean1" class="com.StaticClass" factory-method="createObject">
    <constructor-arg value="foo" />
</bean>
<bean id="bean2" class="com.StaticClass" factory-method="createObject">
    <constructor-arg value="bar" />
</bean>

<bean id="myMap" class="java.util.HashMap">
    <constructor-arg index="0" type="java.util.Map">
        <map key-type="java.lang.Integer" value-type="java.lang.Float">
            <entry key="foo" value-ref=bean1 />
            <entry key="bar" value-ref=bean2 />
        </map>
    </constructor-arg>
</bean>

Instead of creating multiple bean objects, I want to iterate over this list and create a map, using following logic-

for (String m : myList) {
    myMap.put(m, MyStaticFactory.createObject(m));
}

Can I do this in Spring?

Upvotes: 0

Views: 3510

Answers (2)

Avi
Avi

Reputation: 21866

How about using spring @Configuration (see explanation in this link) instead of spring XML?

@Configuration
public class MySpringContext {

   @Bean(name="myMap")
   public Map<String, StaticClass> getMyMapBean() {
      // I'm not sure where you create 'm' but if that's a bean you can inject it to the class and use it.
      for (String m : myList) {
        myMap.put(m, MyStaticFactory.createObject(m));
      }
   }
}

@Configuration classes are a way to define your beans programatically instead of XMLs which gives you much more flexibility to do whatever you want.

Upvotes: 1

Dima
Dima

Reputation: 40510

Something like this maybe: 

public class MyMapBean extends HashMap {
   public MyMapBean(List<String> beanNames) {
       for(name: beanNames) put(name, MyStaticFactory.createObject(name)); 
   }
}

and then in application context:

<bean id="myMap" class="MyMapBean">
    <constructor-arg index="0" value-ref="myList" />       
</bean>

Upvotes: 0

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