TestCompositeReader.java

/*
 * Copyright (C) 2011 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.exoplatform.commons.utils;

import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;

import org.exoplatform.component.test.AbstractGateInTest;
import org.gatein.common.io.IOTools;

/**
 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
 */
public class TestCompositeReader extends AbstractGateInTest {

    private static class MyReader extends StringReader {

        boolean closed = false;

        private MyReader(String s) {
            super(s);
        }

        @Override
        public void close() {
            closed = true;
            super.close();
        }
    }

    public void testMono() {
        MyReader r = new MyReader("foo");
        CompositeReader reader = new CompositeReader(r);
        assertEquals(reader, "foo");
        assertTrue(r.closed);
    }

    public void testPair() {
        MyReader r1 = new MyReader("foo");
        MyReader r2 = new MyReader("bar");
        CompositeReader reader = new CompositeReader(r1, r2);
        assertEquals(reader, "foobar");
        assertTrue(r1.closed);
        assertTrue(r2.closed);
    }

    public void testEmpty() {
        MyReader r1 = new MyReader("");
        MyReader r2 = new MyReader("bar");
        CompositeReader reader = new CompositeReader(r1, r2);
        assertEquals(reader, "bar");

        r1 = new MyReader("foo");
        r2 = new MyReader("");
        reader = new CompositeReader(r1, r2);
        assertEquals(reader, "foo");
    }

    public void testClose() throws IOException {
        MyReader r1 = new MyReader("foo");
        MyReader r2 = new MyReader("bar");
        MyReader r3 = new MyReader("juu");
        CompositeReader reader = new CompositeReader(r1, r2, r3);
        reader.read(new char[4], 0, 4);
        assertTrue(r1.closed);
        assertFalse(r2.closed);
        assertFalse(r3.closed);
        reader.close();
        assertTrue(r1.closed);
        assertTrue(r2.closed);
        assertTrue(r3.closed);
    }

    private void assertEquals(Reader reader, String expected) {
        try {
            StringWriter writer = new StringWriter();
            IOTools.copy(reader, writer);
            String test = writer.toString();
            assertEquals(expected, test);
        } catch (IOException e) {
            fail(e);
        }
    }

}