/**
 * 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:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>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 com.google.common.base.Function;
import java.io.IOException;
import org.apache.commons.io.output.NullWriter;
import org.apache.commons.io.output.StringBuilderWriter;
import org.junit.Assert;
import org.junit.Test;
/**
 * Tests for {@link LimitingTeeWriter}.
 */
public class LimitingTeeWriterTest {

    @Test
    public void testControl() throws IOException {
        final String content = "<p>Simple content</p>";
        StringBuilderWriter stringWriter = new StringBuilderWriter();
        LimitingTeeWriter writer =
                new LimitingTeeWriter(content.length(), NullWriter.NULL_WRITER, stringWriter);
        writer.write(content);

        Assert.assertFalse(writer.isLimitReached());
        Assert.assertEquals(content, stringWriter.toString());
    }

    @Test
    public void testContentExceedsThreshold() throws IOException {
        final String content = "<p>Simple content</p>";
        StringBuilderWriter stringWriter = new StringBuilderWriter();
        LimitingTeeWriter writer =
                new LimitingTeeWriter(content.length() - 1, NullWriter.NULL_WRITER, stringWriter);
        writer.write(content);

        Assert.assertTrue(writer.isLimitReached());
        Assert.assertEquals("", stringWriter.toString());
        // try to write more and see no results
        writer.write("a");
        Assert.assertEquals("", stringWriter.toString());
    }

    @Test
    public void testContentExceedsClearBuffer() throws IOException {
        final String content = "<p>Simple content</p>";
        final StringBuilderWriter stringWriter = new StringBuilderWriter();
        LimitingTeeWriter writer =
                new LimitingTeeWriter(
                        content.length() - 1,
                        NullWriter.NULL_WRITER,
                        stringWriter,
                        new Function<LimitingTeeWriter, Object>() {
                            @Override
                            public Object apply(LimitingTeeWriter input) {
                                final StringBuilder builder = stringWriter.getBuilder();
                                builder.delete(0, builder.length());
                                return null;
                            }
                        });
        // write the first few chars
        writer.write(content.substring(0, 5));
        // verify content successfully buffered
        Assert.assertFalse(writer.isLimitReached());
        Assert.assertEquals(content.substring(0, 5), stringWriter.toString());

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

        Assert.assertTrue(writer.isLimitReached());
        Assert.assertEquals("", stringWriter.toString());
        // try to write more and see no results
        writer.write("a");
        Assert.assertEquals("", stringWriter.toString());
    }

    @Test
    public void testContentExceedsResetBuffer() throws IOException {
        final String content = "<p>Simple content</p>";
        StringBuilderWriter stringWriter = new StringBuilderWriter();
        LimitingTeeWriter writer =
                new LimitingTeeWriter(content.length() - 1, NullWriter.NULL_WRITER, stringWriter);
        writer.write(content);

        Assert.assertTrue(writer.isLimitReached());
        Assert.assertEquals("", stringWriter.toString());

        writer.resetByteCount();

        // try to write more and see results
        writer.write("a");
        Assert.assertEquals("a", stringWriter.toString());
    }
}