/*
 * 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.pdfbox.filter;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;
import java.util.Random;

import junit.framework.TestCase;

import org.apache.pdfbox.cos.COSDictionary;


/**
 * This will test all of the filters in the PDFBox system.
 */
public class TestFilters extends TestCase
{

    /**
     * This will test all of the filters in the system.
     *
     * @throws IOException If there is an exception while encoding.
     */
    public void testFilters() throws IOException
    {
        byte[] original = new byte[12345];
        new Random( 1234567890 ).nextBytes( original );

        FilterManager manager = new FilterManager();
        for( Filter filter : manager.getFilters() )
        {
            // Skip filters that don't currently support roundtripping
            if( filter instanceof DCTFilter ||
                  filter instanceof CCITTFaxDecodeFilter ||
                  filter instanceof JPXFilter ||
                  filter instanceof JBIG2Filter ||
                  filter instanceof RunLengthDecodeFilter )
            {
                continue;
            }

            ByteArrayOutputStream encoded = new ByteArrayOutputStream();
            filter.encode(
                    new ByteArrayInputStream( original ),
                    encoded, new COSDictionary(), 0 );

            ByteArrayOutputStream decoded = new ByteArrayOutputStream();
            filter.decode(
                    new ByteArrayInputStream( encoded.toByteArray() ),
                    decoded, new COSDictionary(), 0 );

            assertTrue(
                    "Data that is encoded and then decoded through "
                    + filter.getClass() + " does not match the original data",
                    Arrays.equals( original, decoded.toByteArray() ) );
        }
    }

}