org.appng.testsupport.validation.XPathDifferenceHandler Maven / Gradle / Ivy
/*
* Copyright 2011-2019 the original author or authors.
*
* Licensed 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.appng.testsupport.validation;
import java.util.HashMap;
import java.util.Map;
import org.custommonkey.xmlunit.Difference;
import org.custommonkey.xmlunit.DifferenceListener;
import org.custommonkey.xmlunit.NodeDetail;
/**
* A {@link DifferenceListener} which ignores the {@link Difference} if the XPath of the node was added to ignorable
* expressions using {@link #ignoreDifference(String)}. Multiple XPath expressions can be added to the ignore list by
* calling {@link #ignoreDifference(String)}. Note that these expressions must be the complete absolute XPath location
* starting from the document root.
*
* @author Matthias Müller
*
* @see Difference#getControlNodeDetail()
* @see Difference#getTestNodeDetail()
* @see NodeDetail#getXpathLocation()
*/
public class XPathDifferenceHandler extends DifferenceHandler {
private static final String POSITON_PATTERN = "\\[\\d+\\]";
private Map handlers = new HashMap<>();
private boolean stripPositions;
/**
* Creates a new {@link XPathDifferenceHandler}.
*
* If there is a difference you want to ignore at the following XPath location
*
*
* /datasource/data/selection[2]/option[4]
*
*
* you can achieve this by either setting up your {@link XPathDifferenceHandler} like this
*
*
* DifferenceHandler differenceHandler = new XPathDifferenceHandler(true);
* differenceHandler.ignoreDifference("/datasource/data/selection/option");
*
*
* or this
*
*
* DifferenceHandler differenceHandler = new XPathDifferenceHandler(false);
* differenceHandler.ignoreDifference("/datasource/data/selection[2]/option[4]");
*
*
* In the first case, with {@code stripPositions = true}, you can omit the positions from the expression. As a side
* effect, every {@link Difference} with the (stripped) XPath of {@code /datasource/data/selection/option} will be
* ignored.
* In the second case, there needs to be an exact match between the registered XPath location and the one from the
* {@link Difference}.
*
*
* @param stripPositions
* whether or not to strip the positions from the actual XPath of the {@link Difference} before checking
* the registry for an appropriate {@link DifferenceListener}
*/
public XPathDifferenceHandler(boolean stripPositions) {
this.stripPositions = stripPositions;
}
/**
* Delegates to {@link #XPathDifferenceHandler(boolean)} with {@code stripPositions = true}.
*
* @see #XPathDifferenceHandler(boolean)
*/
public XPathDifferenceHandler() {
this(true);
}
/**
* Ignore the {@link Difference} with the given XPath expression
*
* @param xpath
* the XPath expression. Note that this must be the complete absolute XPath location starting from the
* document root.
*
*/
public void ignoreDifference(String xpath) {
addDifferenceListener(xpath, new DifferenceHandler() {
@Override
public int differenceFound(Difference difference) {
return RETURN_IGNORE_DIFFERENCE_NODES_IDENTICAL;
}
});
}
/**
* Registers a custom {@link DifferenceListener} for the given XPath expression
*
* @param xpath
* the XPath expression. Note that this must be the complete absolute XPath location starting from the
* document root.
* @param differenceListener
* the {@link DifferenceListener} to register
*/
public void addDifferenceListener(String xpath, DifferenceListener differenceListener) {
handlers.put(xpath, differenceListener);
}
@Override
public int differenceFound(Difference difference) {
NodeDetail controlNodeDetail = difference.getControlNodeDetail();
String xpathLocation = controlNodeDetail.getXpathLocation();
if (null == xpathLocation) {
xpathLocation = difference.getTestNodeDetail().getXpathLocation();
}
DifferenceListener differenceListener = handlers.get(xpathLocation);
if (null == differenceListener && stripPositions) {
differenceListener = handlers.get(xpathLocation.replaceAll(POSITON_PATTERN, ""));
}
if (null != differenceListener) {
return differenceListener.differenceFound(difference);
}
return RETURN_ACCEPT_DIFFERENCE;
}
}