/**
* 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.camel.builder.xml;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import javax.xml.xpath.XPathFunctionResolver;
import org.w3c.dom.Document;
import org.apache.camel.ContextTestSupport;
import org.apache.camel.Exchange;
import org.apache.camel.Expression;
import org.apache.camel.Predicate;
import org.apache.camel.impl.DefaultCamelContext;
import static org.apache.camel.builder.xml.XPathBuilder.xpath;
/**
* @version $Revision: 943033 $
*/
public class XPathTest extends ContextTestSupport {
public void testXPathExpressions() throws Exception {
assertExpression("/foo/bar/@xyz", "<foo><bar xyz='cheese'/></foo>", "cheese");
assertExpression("$name", "<foo><bar xyz='cheese'/></foo>", "James");
assertExpression("foo/bar", "<foo><bar>cheese</bar></foo>", "cheese");
assertExpression("foo/bar/text()", "<foo><bar>cheese</bar></foo>", "cheese");
assertExpression("/foo/@id", "<foo id='cheese'>hey</foo>", "cheese");
}
public void testXPathPredicates() throws Exception {
assertPredicate("/foo/bar/@xyz", "<foo><bar xyz='cheese'/></foo>", true);
assertPredicate("$name = 'James'", "<foo><bar xyz='cheese'/></foo>", true);
assertPredicate("$name = 'Hiram'", "<foo><bar xyz='cheese'/></foo>", false);
assertPredicate("/foo/notExist", "<foo><bar xyz='cheese'/></foo>", false);
}
public void testXPathWithCustomVariable() throws Exception {
assertExpression(xpath("$name").stringResult().variable("name", "Hiram"), "<foo/>", "Hiram");
}
public void testUsingJavaExtensions() throws Exception {
Object instance = null;
// we may not have Xalan on the classpath
try {
instance = Class.forName("org.apache.xalan.extensions.XPathFunctionResolverImpl").newInstance();
if (instance instanceof XPathFunctionResolver) {
XPathFunctionResolver functionResolver = (XPathFunctionResolver)instance;
XPathBuilder builder = xpath("java:" + getClass().getName() + ".func(string(/header/value))").namespace("java", "http://xml.apache.org/xalan/java").functionResolver(functionResolver);
String xml = "<header><value>12</value></header>";
Object value = assertExpression(builder, xml, "modified12");
log.debug("Evaluated xpath: " + builder.getText() + " on XML: " + xml + " result: " + value);
}
} catch (Throwable e) {
log.debug("Could not find Xalan on the classpath so ignoring this test case: " + e);
}
}
public static String func(String s) {
return "modified" + s;
}
protected Object assertExpression(String xpath, String xml, String expected) {
Expression expression = XPathBuilder.xpath(xpath).stringResult();
return assertExpression(expression, xml, expected);
}
protected Object assertExpression(Expression expression, String xml, String expected) {
return assertExpression(expression, createExchange(xml), expected);
}
protected void assertPredicate(String xpath, String xml, boolean expected) {
Predicate predicate = XPathBuilder.xpath(xpath);
assertPredicate(predicate, createExchange(xml), expected);
}
protected Exchange createExchange(String xml) {
Exchange exchange = createExchangeWithBody(new DefaultCamelContext(), xml);
exchange.getIn().setHeader("name", "James");
return exchange;
}
public void testXPathSplit() throws Exception {
Object node = XPathBuilder.xpath("foo/bar").nodeResult()
.evaluate(createExchange("<foo><bar>cheese</bar><bar>cake</bar><bar>beer</bar></foo>"));
assertNotNull(node);
Document doc = context.getTypeConverter().convertTo(Document.class, node);
assertNotNull(doc);
}
public void testXPathSplitConcurrent() throws Exception {
int size = 100;
final Object node = XPathBuilder.xpath("foo/bar").nodeResult()
.evaluate(createExchange("<foo><bar>cheese</bar><bar>cake</bar><bar>beer</bar></foo>"));
assertNotNull(node);
// convert the node concurrently to test that XML Parser is not thread safe when
// importing nodes to a new Document, so try a test for that
final Set<Document> result = new HashSet<Document>();
ExecutorService executor = Executors.newFixedThreadPool(size);
final CountDownLatch latch = new CountDownLatch(size);
for (int i = 0; i < size; i++) {
executor.submit(new Callable<Document>() {
public Document call() throws Exception {
Document doc = context.getTypeConverter().convertTo(Document.class, node);
result.add(doc);
latch.countDown();
return doc;
}
});
}
// give time to convert concurrently
latch.await(20, TimeUnit.SECONDS);
assertEquals(size, result.size());
Iterator<Document> it = result.iterator();
int count = 0;
while (it.hasNext()) {
count++;
Document doc = it.next();
assertNotNull(doc);
}
assertEquals(size, count);
}
}