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CHAPTER 2 THE CORE CONTAINER
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public URL getMyUrl() { return myUrl; } public void setMyUrl(URL myUrl) { this.myUrl = myUrl; } } Next, we can configure the PropertyEditorTestBean class in a configuration file and use String literals, as shown in Listing 2-19. The container will use PropertyEditors to convert these values to the destination type of the properties. Listing 2-19. Configuring PropertyEditorTestBean < xml version="1.0" encoding="UTF-8" > <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean id="testBean" class="com.apress.springbook.chapter02.PropertyEditorTestBean"> <property name="myNumber" value="500"/> <property name="myToggle" value="false"/> <property name="myBytes" value="some bytes"/> <property name="myStrings" value="Bram,Mark,Seth,Steven"/> <property name="myAmount" value="1000000"/> <property name="myClass" value="java.util.Collection"/> <property name="myFile" value="placeholder.txt"/> <property name="myInputStream" value="http://www.google.com"/> <property name="myProperties"> <value> firstname=Steven lastname=Devijver </value> </property> <property name="myUrl" value="http://del.icio.us"/> </bean> </beans> The PropertyEditorTestBeanIntegrationTests test case checks if all property values correspond to the expected value, as shown in Listing 2-20. Listing 2-20. The PropertyEditorTestBeanIntegrationTest Class package com.apress.springbook.chapter02; import junit.framework.TestCase; import org.apache.commons.io.IOUtils; import import import import org.springframework.beans.factory.BeanFactory; org.springframework.beans.factory.xml.XmlBeanFactory; org.springframework.core.io.ClassPathResource; org.springframework.util.StringUtils;
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java.io.File; java.io.IOException; java.math.BigDecimal; java.net.MalformedURLException; java.net.URL; java.util.Arrays; java.util.Collection; java.util.Properties;
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public class PropertyEditorTestBeanIntegrationTests extends TestCase { private static BeanFactory beanFactory = new XmlBeanFactory( new ClassPathResource( "com/apress/springbook/chapter02/property-editor-test-bean-tests.xml" ) ); private static PropertyEditorTestBean testBean; static { testBean = (PropertyEditorTestBean)beanFactory.getBean("testBean"); } public void testMyNumber() { assertEquals(500, testBean.getMyNumber()); } public void testMyToggle() { assertFalse(testBean.isMyToggle()); } public void testMyBytes() { assertTrue(Arrays.equals("some bytes".getBytes(), testBean.getMyBytes())); } public void testMyStrings() { assertTrue( Arrays.equals( new String[]{ "Bram", "Mark", "Seth", "Steven" }, testBean.getMyStrings() ) ); } public void testMyAmount() { assertEquals(new BigDecimal("1000000"), testBean.getMyAmount()); } public void testMyClass() { assertEquals(Collection.class, testBean.getMyClass()); }
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public void testMyFile() { assertEquals(new File("placeholder.txt"), testBean.getMyFile()); } public void testMyInputStream() throws IOException { String content = IOUtils.toString(testBean.getMyInputStream()); assertTrue(StringUtils.hasText("Google")); testBean.getMyInputStream().close(); } public void testMyProperties() { Properties myProps = testBean.getMyProperties(); assertEquals("Steven", myProps.getProperty("firstname")); assertEquals("Devijver", myProps.getProperty("lastname")); } public void testMyUrl() throws MalformedURLException { assertEquals(new URL("http://del.icio.us"), testBean.getMyUrl()); } } The use of PropertyEditors by the Core Container is an important mechanism, adding a lot of power for configuring applications. Along with the standard PropertyEditors, you can also register custom editors and write your own PropertyEditors. 5 of Pro Spring (Apress, 2005) covers these more advanced uses of PropertyEditors.
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The Core Container s XML notation has tags to make the configuration of bean definitions much easier. All these tags can be used as children of the <property> and <constructor-arg> tags.
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The <value> Element
You can use the <value> element to add values: <property name="myToggle"> <value>false</value> </property> Before version 1.2, the container did not support the value attribute on the <property> and <constructor-arg> elements, but used the expanded notation. The <value> element can still be used to add values to lists and maps, and when unparsable text is used as a literal value, as in this example: <property name="myText"> <value><![CDATA[Unparsable characters follow: < > & "]]></value> </property>
The <ref> Element
The container also supports an expanded reference notation using the <ref> element, which refers to another bean: <property name="tournamentMatchManager"> <ref bean="tournamentMatchManager"/> </property>
CHAPTER 2 THE CORE CONTAINER
The <list> Element
The next special-purpose element is <list>: <bean id="daysOfWeek" class="java.util.ArrayList"> <constructor-arg> <list> <value>Monday</value> <value>Tuesday</value> <bean class="java.lang.String"> <constructor-arg type="java.lang.String" value="Wednesday"/> </bean> <value>Thursday</value> <value>Friday</value> <value>Saturday</value> <value>Sunday</value> </list> </constructor-arg> </bean> Child elements of the <list> element can be literal values they will be converted to strings inner bean definitions, references to other bean definitions, other lists, maps, properties, and so on. The <list> element creates an object depending on the target type: java.util.List instances, java.util.Set instances, and array objects.
The <map> Element
The <map> element is very similar to the <list> element, except that it creates a java.util.Map instance. <bean id="topPlayers" class="java.util.HashMap"> <constructor-arg> <map> <entry key="men.number1"> <bean class="com.apress.springbook.chapter02.Player"> <constructor-arg value="Roger Federer"/> </bean> </entry> <entry key="women.number1"> <bean class="com.apress.springbook.chapter02.Player"> <constructor-arg value="Kim Clijsters"/> </bean> </entry> </map> </constructor-arg> </bean> The <entry> element takes a key and a value, where the value can be any element that is accepted by the <property> and <constructor-arg> elements. There are special key-ref and value-ref attributes on the <entry> element that take bean definition names as the key and value. The <entry> element also supports a child <key> element that can take any element that is accepted by the <property> and <constructor-arg> elements, as in this example: < xml version="1.0" encoding="UTF-8" > <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean id="men.number1" class="java.lang.String">
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