org.apache.wicket.util.tester.DiffUtil Maven / Gradle / Ivy
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/*
* 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.wicket.util.tester;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.net.URL;
import junit.framework.Assert;
import org.apache.wicket.markup.MarkupParser;
import org.apache.wicket.markup.MarkupStream;
import org.apache.wicket.util.diff.Diff;
import org.apache.wicket.util.diff.DifferentiationFailedException;
import org.apache.wicket.util.io.Streams;
import org.apache.wicket.util.lang.Args;
import org.apache.wicket.util.resource.ResourceStreamNotFoundException;
import org.apache.wicket.util.string.StringList;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This is a utility class. It serves two purposes.
*
* First: compare a string output generated by wicket with a file's content (expected result).
*
* Second: Create/replace the expected result file with the new content, if a system property has be
* made available like -Dwicket.replace.expected.results=true
*
* @author Juergen Donnerstag
*/
public final class DiffUtil
{
private static final Logger log = LoggerFactory.getLogger(DiffUtil.class);
private static final String ENCODING = "UTF-8";
/**
* Replace the expected result file with the current output.
*
* @param document
* How the expected result should look like
* @param clazz
* Used to load the file (relative to clazz package)
* @param file
* The name of the expected result file to be created
* @throws IOException
*/
public final static void replaceExpectedResultFile(final String document, final Class clazz,
final String file) throws IOException
{
String filename = clazz.getPackage().getName();
filename = filename.replace('.', '/');
filename += "/" + file;
final URL url = clazz.getClassLoader().getResource(filename);
filename = url.getFile();
filename = filename.replaceAll("/target/test-classes/", "/src/test/java/");
PrintWriter out = new PrintWriter(new FileOutputStream(filename));
out.print(document);
out.close();
}
/**
* Compare the output generated by Wicket ("document") with the a previously generated file
* which contains the expected result.
*
* @param document
* Current output
* @param file
* Expected output
* @param clazz
* Used to load the file (relative to clazz package)
* @param failWithAssert
* @return true, if equal
* @throws IOException
*/
public static final boolean validatePage(String document, final Class clazz,
final String file, boolean failWithAssert) throws IOException
{
Args.notNull(document, "document");
String filename = clazz.getPackage().getName();
filename = filename.replace('.', '/');
filename += "/" + file;
InputStream in = clazz.getClassLoader().getResourceAsStream(filename);
if (in == null)
{
throw new IOException("File not found: " + filename);
}
String reference = Streams.readString(in, ENCODING);
// replace all line endings with unix style line ending
reference = reference.replaceAll("\n\r", "\n");
reference = reference.replaceAll("\r\n", "\n");
// replace all line endings with unix style line ending
document = document.replaceAll("\n\r", "\n");
document = document.replaceAll("\r\n", "\n");
boolean equals = compareMarkup(document, reference);
if (equals == false)
{
// Change the condition to true, if you want to make the new output
// the reference output for future tests. That is, it is regarded as
// correct. It'll replace the current reference files. Thus change
// it only for one test-run.
// -Dwicket.replace.expected.results=true
if (Boolean.getBoolean("wicket.replace.expected.results"))
{
in.close();
in = null;
replaceExpectedResultFile(document, clazz, file);
return true;
}
log.error("File name: " + file);
/* */
log.error("===================");
log.error(reference);
log.error("===================");
log.error(document);
log.error("===================");
/* */
String[] test1 = StringList.tokenize(reference, "\n").toArray();
String[] test2 = StringList.tokenize(document, "\n").toArray();
Diff df = new Diff(test1);
try
{
df.diff(test2);
}
catch (DifferentiationFailedException e)
{
throw new RuntimeException(e);
}
// System.out.println(r.toString());
if (failWithAssert)
{
Assert.assertEquals(filename, reference, document);
}
}
return equals;
}
/**
* @param a
* String a
* @param b
* String b
* @return True if the two strings have the same markup tags
*/
private static boolean compareMarkup(final String a, final String b)
{
try
{
// Parse a and b into markup and compare
final MarkupStream amarkup = new MarkupStream(new MarkupParser(a).parse());
final MarkupStream bmarkup = new MarkupStream(new MarkupParser(b).parse());
return amarkup.equalTo(bmarkup);
}
catch (IOException e)
{
log.error(e.getMessage(), e);
}
catch (ResourceStreamNotFoundException e)
{
log.error(e.getMessage(), e);
}
return false;
}
}