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Commons Digester example source code file (VariableExpansionTestCase.java)
This example Commons Digester source code file (VariableExpansionTestCase.java) is included in the DevDaily.com
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The Commons Digester VariableExpansionTestCase.java source code
/* $Id: VariableExpansionTestCase.java 992060 2010-09-02 19:09:47Z simonetripodi $
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.commons.digester.substitution;
import static org.junit.Assert.*;
import java.io.IOException;
import java.io.StringReader;
import java.util.HashMap;
import java.util.LinkedList;
import org.apache.commons.digester.CallMethodRule;
import org.apache.commons.digester.Digester;
import org.apache.commons.digester.SimpleTestBean;
import org.junit.Test;
import org.xml.sax.SAXException;
/**
* <p>Test Case for the variable expansion facility in Digester.
*
* @author Simon Kitching
* @version $Revision: 992060 $ $Date: 2010-09-02 21:09:47 +0200 (Thu, 02 Sep 2010) $
*/
public class VariableExpansionTestCase {
// --------------------------------------------------- Overall Test Methods
// method used in tests4
private LinkedList<SimpleTestBean> simpleTestBeans = new LinkedList();
public void addSimpleTestBean(SimpleTestBean bean) {
simpleTestBeans.add(bean);
}
// implementation of source shared by the variable expander and
// is updatable during digesting via an Ant-like property element
private HashMap<String, Object> mutableSource=new HashMap();
/**
* Used in test case "testExpansionWithMutableSource", where the
* set of variables available to be substituted into the xml is
* updated as the xml is parsed.
*/
public void addProperty(String key, String value) {
mutableSource.put(key, value);
}
/**
* Creates a Digester configured to show Ant-like capability.
*
* @return a Digester with rules and variable substitutor
*/
private Digester createDigesterThatCanDoAnt() {
Digester digester = new Digester();
MultiVariableExpander expander = new MultiVariableExpander();
expander.addSource("$", mutableSource);
digester.setSubstitutor(new VariableSubstitutor(expander));
int useRootObj = -1;
Class<?>[] callerArgTypes = new Class[] {String.class, String.class};
CallMethodRule caller = new CallMethodRule(useRootObj, "addProperty",
callerArgTypes.length, callerArgTypes);
digester.addRule("root/property", caller);
digester.addCallParam("root/property", 0, "name");
digester.addCallParam("root/property", 1, "value");
digester.addObjectCreate("root/bean", SimpleTestBean.class);
digester.addSetProperties("root/bean");
digester.addSetNext("root/bean", "addSimpleTestBean");
return digester;
}
// ------------------------------------------------ Individual Test Methods
/**
* Test that by default no expansion occurs.
*/
@Test
public void testNoExpansion() throws SAXException, IOException {
String xml = "<root alpha='${attr1}' beta='var{attr2}'/>";
StringReader input = new StringReader(xml);
Digester digester = new Digester();
// Configure the digester as required
digester.addObjectCreate("root", SimpleTestBean.class);
digester.addSetProperties("root");
// Parse our test input.
Object root = digester.parse(input);
assertNotNull("Digester returned no object", root);
SimpleTestBean bean = (SimpleTestBean) root;
assertEquals("${attr1}", bean.getAlpha());
assertEquals("var{attr2}", bean.getBeta());
}
/**
* Test that a MultiVariableExpander with no sources does no expansion.
*/
@Test
public void testExpansionWithNoSource() throws SAXException, IOException {
String xml = "<root alpha='${attr1}' beta='var{attr2}'/>";
StringReader input = new StringReader(xml);
Digester digester = new Digester();
// Configure the digester as required
MultiVariableExpander expander = new MultiVariableExpander();
digester.setSubstitutor(new VariableSubstitutor(expander));
digester.addObjectCreate("root", SimpleTestBean.class);
digester.addSetProperties("root");
// Parse our test input.
Object root = digester.parse(input);
assertNotNull("Digester returned no object", root);
SimpleTestBean bean = (SimpleTestBean) root;
assertEquals("${attr1}", bean.getAlpha());
assertEquals("var{attr2}", bean.getBeta());
}
/**
* Test that a MultiVariableExpander with multiple sources works.
* It also tests that expansion works ok where multiple elements
* exist.
*/
@Test
public void testExpansionWithMultipleSources() throws SAXException, IOException {
String xml =
"<root>" +
"<bean alpha='${attr1}' beta='var{attr1}'/>" +
"<bean alpha='${attr2}' beta='var{attr2}'/>" +
"</root>";
StringReader input = new StringReader(xml);
Digester digester = new Digester();
// Configure the digester as required
HashMap<String, Object> source1 = new HashMap();
source1.put("attr1", "source1.attr1");
source1.put("attr2", "source1.attr2"); // should not be used
HashMap<String, Object> source2 = new HashMap();
source2.put("attr1", "source2.attr1"); // should not be used
source2.put("attr2", "source2.attr2");
MultiVariableExpander expander = new MultiVariableExpander();
expander.addSource("$", source1);
expander.addSource("var", source2);
digester.setSubstitutor(new VariableSubstitutor(expander));
digester.addObjectCreate("root/bean", SimpleTestBean.class);
digester.addSetProperties("root/bean");
digester.addSetNext("root/bean", "addSimpleTestBean");
// Parse our test input.
this.simpleTestBeans.clear();
digester.push(this);
digester.parse(input);
assertEquals(2, this.simpleTestBeans.size());
{
SimpleTestBean bean = this.simpleTestBeans.get(0);
assertEquals("source1.attr1", bean.getAlpha());
assertEquals("source2.attr1", bean.getBeta());
}
{
SimpleTestBean bean = this.simpleTestBeans.get(1);
assertEquals("source1.attr2", bean.getAlpha());
assertEquals("source2.attr2", bean.getBeta());
}
}
/**
* Test expansion of text in element bodies.
*/
@Test
public void testBodyExpansion() throws SAXException, IOException {
String xml =
"<root>" +
"Twas noun{1} and the noun{2}" +
" did verb{1} and verb{2} in the noun{3}" +
"</root>";
StringReader input = new StringReader(xml);
Digester digester = new Digester();
// Configure the digester as required
HashMap<String, Object> nouns = new HashMap();
nouns.put("1", "brillig");
nouns.put("2", "slithy toves");
nouns.put("3", "wabe");
HashMap<String, Object> verbs = new HashMap();
verbs.put("1", "gyre");
verbs.put("2", "gimble");
MultiVariableExpander expander = new MultiVariableExpander();
expander.addSource("noun", nouns);
expander.addSource("verb", verbs);
digester.setSubstitutor(new VariableSubstitutor(expander));
digester.addObjectCreate("root", SimpleTestBean.class);
digester.addCallMethod("root", "setAlpha", 0);
// Parse our test input.
Object root = digester.parse(input);
assertNotNull("Digester returned no object", root);
SimpleTestBean bean = (SimpleTestBean) root;
assertEquals(
"Twas brillig and the slithy toves" +
" did gyre and gimble in the wabe",
bean.getAlpha());
}
/**
* Test that an unknown variable causes a RuntimeException.
*/
@Test
public void testExpansionException() throws IOException {
String xml = "<root alpha='${attr1}'/>";
StringReader input = new StringReader(xml);
Digester digester = new Digester();
// Configure the digester as required
MultiVariableExpander expander = new MultiVariableExpander();
expander.addSource("$", new HashMap<String, Object>());
digester.setSubstitutor(new VariableSubstitutor(expander));
digester.addObjectCreate("root", SimpleTestBean.class);
digester.addSetProperties("root");
// Parse our test input.
try {
digester.parse(input);
fail("Exception expected due to unknown variable.");
} catch(SAXException e) {
// expected, due to reference to undefined variable
}
}
/**
* First of two tests added to verify that the substitution
* framework is capable of processing Ant-like properties.
*
* The tests above essentially verify that if a property
* was pre-set (e.g. using the "-D" option to Ant), then
* the property could be expanded via a variable used either
* in an attribute or in body text.
*
* This test shows that if properties were also set while
* processing a document, you could still perform variable
* expansion (i.e. just like using the "property" task in Ant).
*
* @throws IOException
* @throws SAXException
*/
@Test
public void testExpansionWithMutableSource() throws SAXException, IOException {
String xml =
"<root>" +
"<property name='attr' value='prop.value'/>" +
"<bean alpha='${attr}'/>" +
"</root>";
StringReader input = new StringReader(xml);
Digester digester = createDigesterThatCanDoAnt();
simpleTestBeans.clear();
digester.push(this);
digester.parse(input);
assertEquals(1, simpleTestBeans.size());
SimpleTestBean bean = simpleTestBeans.get(0);
assertEquals("prop.value", bean.getAlpha());
}
/**
* Second of two tests added to verify that the substitution
* framework is capable of processing Ant-like properties.
*
* This test shows that if properties were also set while
* processing a document, the resulting variables could also
* be expanded within a property element. This is thus
* effectively a "closure" test, since it shows that the
* mechanism used to bind properties is also capable of
* having property values that are driven by property variables.
*
* @throws IOException
* @throws SAXException
*/
@Test
public void testExpansionOfPropertyInProperty() throws SAXException, IOException {
String xml =
"<root>" +
"<property name='attr1' value='prop.value1'/>" +
"<property name='attr2' value='substituted-${attr1}'/>" +
"<bean alpha='${attr2}'/>" +
"</root>";
StringReader input = new StringReader(xml);
Digester digester = createDigesterThatCanDoAnt();
simpleTestBeans.clear();
digester.push(this);
digester.parse(input);
assertEquals(1, simpleTestBeans.size());
SimpleTestBean bean = simpleTestBeans.get(0);
assertEquals("substituted-prop.value1", bean.getAlpha());
}
}
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