deepdiff.unitprocessor.BinaryCompareDiffUnitProcessor Maven / Gradle / Ivy

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/*
 * Copyright 2011 DeepDiff Contributors
 *
 * 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 deepdiff.unitprocessor;

import java.io.IOException;
import java.io.InputStream;

import org.apache.log4j.Logger;

import deepdiff.core.DiffPoint;
import deepdiff.core.DiffPointProcessor;
import deepdiff.core.DiffScope;
import deepdiff.core.DiffUnit;
import deepdiff.core.DiffUnitProcessor;

/**
 * A DiffUnitProcessor that performs binary file comparisons on DiffUnits.
 */
public class BinaryCompareDiffUnitProcessor implements DiffUnitProcessor {
    private static final Logger log = Logger.getLogger(BinaryCompareDiffUnitProcessor.class);

    /**
     * Performs a binary file comparison on diffUnit, and passes any {@link DiffPoint}s
     * found to processor
     * 
     * @param diffUnit the unit to process
     * @param processor the processor to pass differences to
     * 
     * @return null (no child scopes needed)
     */
    public DiffScope processDiffUnit(DiffUnit diffUnit, DiffPointProcessor processor) {
        InputStream is1 = null;
        InputStream is2 = null;
        try {
            is1 = diffUnit.getLeftInputStream();
            is2 = diffUnit.getRightInputStream();
            int b1 = is1.read();
            int b2 = is2.read();
            while (b1 != -1 && b2 != -1) {
                if (b1 != b2) {
                    DiffPoint diffPoint = new DiffPoint(diffUnit, "Binary file difference");
                    processor.processDiffPoint(diffPoint);
                    break;
                }
                b1 = is1.read();
                b2 = is2.read();
            }
            if (b1 != b2) {
                DiffPoint diffPoint = new DiffPoint(diffUnit, "Binary file difference");
                processor.processDiffPoint(diffPoint);
            }
        } catch (IOException ioe) {
            log.error("Failure performing binary comparison on " + diffUnit.getScopedPath(), ioe);
        } finally {
            if (is1 != null) {
                try {
                    is1.close();
                } catch (Exception ex) {
                    // Ignore exception on close
                }
            }
            if (is2 != null) {
                try {
                    is2.close();
                } catch (Exception ex) {
                    // Ignore exception on close
                }
            }
        }
        return null; // No child scopes needed
    }
}