org.apereo.portal.portlet.container.cache.LimitingTeeOutputStreamTest.java Source code

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Here is the source code for org.apereo.portal.portlet.container.cache.LimitingTeeOutputStreamTest.java

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/**
 * Licensed to Apereo under one or more contributor license
 * agreements. See the NOTICE file distributed with this work
 * for additional information regarding copyright ownership.
 * Apereo 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 the following location:
 *
 *   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.apereo.portal.portlet.container.cache;

import static junit.framework.Assert.assertFalse;
import static junit.framework.Assert.assertTrue;
import static org.junit.Assert.assertArrayEquals;

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

import org.apache.commons.io.output.NullOutputStream;
import org.junit.Test;

import com.google.common.base.Function;

/**
 * Tests for {@link LimitingTeeOutputStream}.
 * 
 * @author Nicholas Blair
 *
 */
public class LimitingTeeOutputStreamTest {

    @Test
    public void testControl() throws IOException {
        final byte[] content = "<p>Simple content</p>".getBytes();
        ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
        LimitingTeeOutputStream stream = new LimitingTeeOutputStream(content.length,
                NullOutputStream.NULL_OUTPUT_STREAM, byteStream);
        stream.write(content);

        assertFalse(stream.isLimitReached());
        assertArrayEquals(content, byteStream.toByteArray());
    }

    @Test
    public void testContentExceedsThreshold() throws IOException {
        final byte[] content = "<p>Simple content</p>".getBytes();
        ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
        LimitingTeeOutputStream stream = new LimitingTeeOutputStream(content.length - 1,
                NullOutputStream.NULL_OUTPUT_STREAM, byteStream);
        stream.write(content);

        assertTrue(stream.isLimitReached());
        assertArrayEquals(new byte[0], byteStream.toByteArray());
        // try to write more and see no results
        stream.write("a".getBytes());
        assertArrayEquals(new byte[0], byteStream.toByteArray());
    }

    @Test
    public void testContentExceedsClearBuffer() throws IOException {
        final byte[] content = "<p>Simple content</p>".getBytes();
        final ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
        LimitingTeeOutputStream stream = new LimitingTeeOutputStream(content.length - 1,
                NullOutputStream.NULL_OUTPUT_STREAM, byteStream, new Function<LimitingTeeOutputStream, Object>() {
                    @Override
                    public Object apply(LimitingTeeOutputStream input) {
                        byteStream.reset();
                        return null;
                    }
                });
        // write the first few chars
        stream.write(content, 0, 5);
        // verify content successfully buffered
        assertFalse(stream.isLimitReached());
        final byte[] subContent = Arrays.copyOf(content, 5);
        assertArrayEquals(subContent, byteStream.toByteArray());

        // now write the remainder 
        stream.write(content, 5, content.length);

        assertTrue(stream.isLimitReached());
        assertArrayEquals(new byte[0], byteStream.toByteArray());
        // try to write more and see no results
        stream.write("a".getBytes());
        assertArrayEquals(new byte[0], byteStream.toByteArray());
    }

    @Test
    public void testContentExceedsResetBuffer() throws IOException {
        final byte[] content = "<p>Simple content</p>".getBytes();
        ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
        LimitingTeeOutputStream stream = new LimitingTeeOutputStream(content.length - 1,
                NullOutputStream.NULL_OUTPUT_STREAM, byteStream);
        stream.write(content);

        assertTrue(stream.isLimitReached());
        assertArrayEquals(new byte[0], byteStream.toByteArray());

        stream.resetByteCount();

        // try to write more and see results
        stream.write("a".getBytes());
        assertArrayEquals("a".getBytes(), byteStream.toByteArray());
    }
}