/*
* 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.commons.compress.utils;
import java.io.ByteArrayInputStream;
import java.io.FilterInputStream;
import java.io.InputStream;
import java.io.IOException;
import org.junit.Assert;
import org.junit.Test;
public class IOUtilsTest {
private interface StreamWrapper {
InputStream wrap(InputStream toWrap);
}
@Test
public void skipUsingSkip() throws Exception {
skip(new StreamWrapper() {
public InputStream wrap(InputStream toWrap) {
return toWrap;
}
});
}
@Test
public void skipUsingRead() throws Exception {
skip(new StreamWrapper() {
public InputStream wrap(InputStream toWrap) {
return new FilterInputStream(toWrap) {
public long skip(long s) {
return 0;
}
};
}
});
}
@Test
public void skipUsingSkipAndRead() throws Exception {
skip(new StreamWrapper() {
public InputStream wrap(final InputStream toWrap) {
return new FilterInputStream(toWrap) {
boolean skipped;
public long skip(long s) throws IOException {
if (!skipped) {
toWrap.skip(5);
skipped = true;
return 5;
}
return 0;
}
};
}
});
}
private void skip(StreamWrapper wrapper) throws Exception {
ByteArrayInputStream in = new ByteArrayInputStream(new byte[] {
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
});
InputStream sut = wrapper.wrap(in);
Assert.assertEquals(10, IOUtils.skip(sut, 10));
Assert.assertEquals(11, sut.read());
}
}