/**
* 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.tika;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.tika.utils.RereadableInputStream;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class TestRereadableInputStream {
private final int TEST_SIZE = 3;
private final int MEMORY_THRESHOLD = 1;
private final int NUM_PASSES = 4;
@Test
public void test() throws IOException {
InputStream is = createTestInputStream();
RereadableInputStream ris = new RereadableInputStream(is,
MEMORY_THRESHOLD, true, true);
try {
for (int pass = 0; pass < NUM_PASSES; pass++) {
for (int byteNum = 0; byteNum < TEST_SIZE; byteNum++) {
int byteRead = ris.read();
assertEquals("Pass = " + pass + ", byte num should be "
+ byteNum + " but is " + byteRead + ".", byteNum,
byteRead);
}
ris.rewind();
}
} finally {
// The RereadableInputStream should close the original input
// stream (if it hasn't already).
ris.close();
}
}
/**
* Test that the constructor's readToEndOfStreamOnFirstRewind parameter
* correctly determines the behavior.
*
* @throws IOException
*/
@Test
public void testRewind() throws IOException {
doTestRewind(true);
doTestRewind(false);
}
private void doTestRewind(boolean readToEndOnRewind) throws IOException {
RereadableInputStream ris = null;
try {
InputStream s1 = createTestInputStream();
ris = new RereadableInputStream(s1, 5, readToEndOnRewind, true);
ris.read();
assertEquals(1, ris.getSize());
ris.rewind();
boolean moreBytesWereRead = (ris.getSize() > 1);
assertEquals(readToEndOnRewind, moreBytesWereRead);
} finally {
if (ris != null) {
ris.close();
}
}
}
private TestInputStream createTestInputStream() throws IOException {
return new TestInputStream(
new BufferedInputStream(
new FileInputStream(createTestFile())));
}
private File createTestFile() throws IOException {
File testfile = File.createTempFile("TIKA_ris_test", ".tmp");
testfile.deleteOnExit();
FileOutputStream fos = new FileOutputStream(testfile);
for (int i = 0; i < TEST_SIZE; i++) {
fos.write(i);
}
fos.close();
return testfile;
}
@Test
public void testCloseBehavior() throws IOException {
doACloseBehaviorTest(true);
doACloseBehaviorTest(false);
}
private void doACloseBehaviorTest(boolean wantToClose) throws IOException {
TestInputStream tis = createTestInputStream();
RereadableInputStream ris =
new RereadableInputStream(tis, 5, true, wantToClose);
ris.close();
assertEquals(wantToClose, tis.isClosed());
if (! tis.isClosed()) {
tis.close();
}
}
/**
* Adds isClosed() to a BufferedInputStream.
*/
class TestInputStream extends BufferedInputStream {
private boolean closed;
public TestInputStream(InputStream inputStream) {
super(inputStream);
}
public void close() throws IOException {
super.close();
closed = true;
}
public boolean isClosed() {
return closed;
}
}
}