org.kalypso.commons.junit.FileAssert.java Source code

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Here is the source code for org.kalypso.commons.junit.FileAssert.java

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/*----------------    FILE HEADER KALYPSO ------------------------------------------
 *
 *  This file is part of kalypso.
 *  Copyright (C) 2004 by:
 * 
 *  Technical University Hamburg-Harburg (TUHH)
 *  Institute of River and coastal engineering
 *  Denickestrae 22
 *  21073 Hamburg, Germany
 *  http://www.tuhh.de/wb
 * 
 *  and
 *  
 *  Bjoernsen Consulting Engineers (BCE)
 *  Maria Trost 3
 *  56070 Koblenz, Germany
 *  http://www.bjoernsen.de
 * 
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 * 
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 * 
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 *  Contact:
 * 
 *  E-Mail:
 *  belger@bjoernsen.de
 *  schlienger@bjoernsen.de
 *  v.doemming@tuhh.de
 *   
 *  ---------------------------------------------------------------------------*/
package org.kalypso.commons.junit;

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.junit.Assert;

/**
 * Junit helper class for testing files.
 * 
 * @author Gernot Belger
 */
public class FileAssert extends Assert {
    /**
     * Asserts that the contents of two files is equal.
     */
    public static void assertFileContentEquals(final File expected, final File actual) {
        try {
            final List<String> actualLines = FileUtils.readLines(actual, (Charset) null);
            final List<String> expectedLines = FileUtils.readLines(expected, (Charset) null);

            final Iterator<String> actualIt = actualLines.iterator();
            final Iterator<String> expectedIt = expectedLines.iterator();

            int count = 0;
            while (expectedIt.hasNext() && actualIt.hasNext()) {
                count++;

                final Object expectedLine = expectedIt.next();
                final Object actualLine = actualIt.next();

                try {
                    Assert.assertEquals(expectedLine, actualLine);
                } catch (final AssertionError e) {
                    final String msg = String.format("Line %d: %s", count, e.getLocalizedMessage()); //$NON-NLS-1$
                    fail(msg);
                }
            }

            assertIteratorIsEmpty("Actual file is longer than expected: ", actualIt); //$NON-NLS-1$
            assertIteratorIsEmpty("Expected file is longer than actual: ", expectedIt); //$NON-NLS-1$
        } catch (final IOException e) {
            e.printStackTrace();
            Assert.fail("Failed to access file: " + e.getLocalizedMessage()); //$NON-NLS-1$
        }
    }

    private static void assertIteratorIsEmpty(final String msg, final Iterator<?> actualIt) {
        final String dumpActual = dumpIterator(actualIt);
        if (dumpActual != null)
            fail(msg + dumpActual);
    }

    private static String dumpIterator(final Iterator<?> iter) {
        if (!iter.hasNext())
            return null;

        final StringBuilder builder = new StringBuilder();
        while (iter.hasNext())
            builder.append(iter.next());
        return builder.toString();
    }

}