xref: /libcore/harmony-tests/src/test/java/org/apache/harmony/tests/java/io/PushbackReaderTest.java

/*
 *  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.harmony.tests.java.io;

import java.io.CharArrayReader;
import java.io.FilterReader;
import java.io.IOException;
import java.io.PushbackReader;
import java.io.Reader;
import java.io.StringReader;

public class PushbackReaderTest extends junit.framework.TestCase {

    PushbackReader pbr;

    String pbString = "Hello World";

    /**
     * java.io.PushbackReader#PushbackReader(java.io.Reader)
     */
    public void test_ConstructorLjava_io_Reader() {
        // Test for method java.io.PushbackReader(java.io.Reader)
        try {
            pbr.close();
            pbr = new PushbackReader(new StringReader(pbString));
            char buf[] = new char[5];
            pbr.read(buf, 0, 5);
            pbr.unread(buf);
        } catch (IOException e) {
            // Correct
            return;
        }
        fail("Created reader with buffer larger than 1");
    }

    /**
     * java.io.PushbackReader#PushbackReader(java.io.Reader, int)
     */
    public void test_ConstructorLjava_io_ReaderI() {
        // Test for method java.io.PushbackReader(java.io.Reader, int)
        assertTrue("Used to test", true);
    }

    /**
     * java.io.PushbackReader#close()
     */
    public void test_close() {
        // Test for method void java.io.PushbackReader.close()
        try {
            pbr.close();
            pbr.read();
        } catch (Exception e) {
            return;
        }
        fail("Failed to throw exception reading from closed reader");
    }

    /**
     * java.io.PushbackReader#mark(int)
     */
    public void test_markI() {
        try {
            pbr.mark(3);
        } catch (IOException e) {
            // correct
            return;
        }
        fail("mark failed to throw expected IOException");
    }

    /**
     * java.io.PushbackReader#markSupported()
     */
    public void test_markSupported() {
        // Test for method boolean java.io.PushbackReader.markSupported()
        assertTrue("markSupported returned true", !pbr.markSupported());
    }

    /**
     * java.io.PushbackReader#read()
     */
    public void test_read() {
        // Test for method int java.io.PushbackReader.read()
        try {
            char c;
            pbr.read();
            c = (char) pbr.read();
            assertTrue("Failed to read char: " + c, c == pbString.charAt(1));
            Reader reader = new PushbackReader(new CharArrayReader(
                    new char[] { '\u8765' }));
            assertTrue("Wrong double byte character", reader.read() == '\u8765');
        } catch (IOException e) {
            fail("IOException during read test : " + e.getMessage());
        }
    }

    /**
     * java.io.PushbackReader#read(char[], int, int)
     */
    public void test_read$CII() {
        // Test for method int java.io.PushbackReader.read(char [], int, int)
        try {
            char[] c = new char[5];
            pbr.read(c, 0, 5);
            assertTrue("Failed to read chars", new String(c).equals(pbString
                    .substring(0, 5)));
        } catch (IOException e) {
            fail("IOException during read test : " + e.getMessage());
        }
    }

    public void test_read_$CII_Exception() throws IOException {
        pbr = new PushbackReader(new StringReader(pbString), 10);

        char[] charArray = new char[10];

        try {
            pbr.read(null, 1, 0);
            fail();
        } catch (NullPointerException expected) {
        }
        try {
            pbr.read(charArray, 0, -1);
            fail();
        } catch (IndexOutOfBoundsException expected) {
        }
        try {
            pbr.read(charArray, -1, 0);
            fail();
        } catch (IndexOutOfBoundsException expected) {
        }

        pbr.read(charArray, 0, 0);
        pbr.read(charArray, 0, charArray.length);
        pbr.read(charArray, charArray.length, 0);

        try {
            pbr.read(charArray, charArray.length + 1, 0);
            fail();
        } catch (IndexOutOfBoundsException expected) {
        }
        try {
            pbr.read(charArray, 0, charArray.length + 1);
            fail();
        } catch (IndexOutOfBoundsException expected) {
        }

        // Can't read from a closed PushbackReader.
        pbr.close();
        try {
            pbr.read(charArray, 0, 1);
            fail();
        } catch (IOException expected) {
        }
    }

    /**
     * java.io.PushbackReader#ready()
     */
    public void test_ready() {
        // Test for method boolean java.io.PushbackReader.ready()
        try {
            char[] c = new char[11];
            if (c.length > 0)
                ;// use c to avoid warning msg
            assertTrue("Ready stream returned false to ready()", pbr.ready());
        } catch (IOException e) {
            fail("IOException during ready() test : " + e.getMessage());
        }
    }

    /**
     * java.io.PushbackReader#reset()
     */
    public void test_reset() {
        try {
            pbr.reset();
        } catch (IOException e) {
            // correct
            return;
        }
        fail("mark failed to throw expected IOException");
    }

    /**
     * java.io.PushbackReader#unread(char[])
     */
    public void test_unread$C() {
        // Test for method void java.io.PushbackReader.unread(char [])
        try {
            char[] c = new char[5];
            pbr.read(c, 0, 5);
            pbr.unread(c);
            pbr.read(c, 0, 5);
            assertTrue("Failed to unread chars", new String(c).equals(pbString
                    .substring(0, 5)));
        } catch (IOException e) {
            fail("IOException during read test : " + e.getMessage());
        }
    }

    /**
     * java.io.PushbackReader#skip(long)
     */
    public void test_skip$J() {
        char chars[] = new char[] { 'h', 'e', 'l', 'l', 'o' };
        for (int i = 0; i < 3; i++) {
            Reader reader, reader2;
            switch (i) {
                case 0:
                    reader = new StringReader(new String(chars));
                    reader2 = new StringReader(new String(chars));
                    break;
                case 1:
                    reader = new FilterReader(new StringReader(new String(chars))) {
                    };
                    reader2 = new FilterReader(new StringReader(new String(chars))) {
                    };
                    break;
                default:
                    reader = new CharArrayReader(chars);
                    reader2 = new CharArrayReader(chars);
            }
            PushbackReader pReader = new PushbackReader(reader, 2);
            PushbackReader pReader2 = new PushbackReader(reader2, 2);
            boolean skipped = false;
            long numSkipped = 0;
            try {
                numSkipped = pReader2.skip(3);
                pReader2.unread('a');
                pReader2.unread('b');
                numSkipped += pReader2.skip(10);
                numSkipped += pReader2.skip(10);
                numSkipped += pReader2.skip(10);
                numSkipped += pReader2.skip(10);
                numSkipped += pReader2.skip(10);
                numSkipped += pReader2.skip(10);
                assertEquals("Did not skip correct number of characters",
                        7, numSkipped);
                numSkipped = 0;
                numSkipped += pReader.skip(2);
                pReader.unread('i');
                numSkipped += pReader.skip(2);
                numSkipped += pReader.skip(0);
                skipped = true;
                numSkipped += pReader.skip(-1);
                fail("Failed to throw "
                        + new IllegalArgumentException().getClass().getName());
            } catch (IllegalArgumentException e) {
                assertTrue("Failed to skip characters" + e, skipped);
            } catch (IOException e) {
                fail("Failed to skip characters" + e);
            }
            try {
                numSkipped += pReader.skip(1);
                numSkipped += pReader.skip(1);
                numSkipped += pReader.skip(1);
                assertEquals("Failed to skip all characters", 6, numSkipped);
                long nextSkipped = pReader.skip(1);
                assertEquals("skipped empty reader", 0, nextSkipped);
            } catch (IOException e) {
                fail("Failed to skip more characters" + e);
            }
        }
    }

    /**
     * java.io.PushbackReader#unread(char[], int, int)
     */
    public void test_unread$CII() {
        // Test for method void java.io.PushbackReader.unread(char [], int, int)
        try {
            char[] c = new char[5];
            pbr.read(c, 0, 5);
            pbr.unread(c, 0, 2);
            pbr.read(c, 0, 5);
            assertTrue("Failed to unread chars", new String(c).equals(pbString
                    .substring(0, 2)
                    + pbString.substring(5, 8)));
        } catch (IOException e) {
            fail("IOException during unread test : " + e.getMessage());
        }
    }

    /**
     * java.io.PushbackReader#unread(char[], int, int)
     */
    public void test_unread_$CII_NullPointerException() throws IOException {
        //a pushback reader with one character buffer
        pbr = new PushbackReader(new StringReader(pbString));

        try {
            pbr.unread(null, 0, 1);
            fail("should throw NullPointerException");
        } catch (NullPointerException e) {
            // expected
        }
    }

    /**
     * java.io.PushbackReader#unread(char[], int, int)
     */
    public void test_unread_$CII_Exception_InsufficientBuffer() throws IOException {
        //a pushback reader with one character buffer
        pbr = new PushbackReader(new StringReader(pbString));

        //if count > buffer's size , should throw IOException
        try {
            pbr.unread(new char[pbString.length()], 0, 2);
            fail("should throw IOException");
        } catch (IOException e) {
            // expected
        }
    }

    /**
     * java.io.PushbackReader#unread(char[], int, int)
     */
    public void test_unread_$CII_ArrayIndexOutOfBoundsException() throws IOException {
        //a pushback reader with one character buffer
        pbr = new PushbackReader(new StringReader(pbString));

        try {
            pbr.unread(new char[pbString.length()], -1, -1);
            fail("should throw ArrayIndexOutOfBoundsException");
        } catch (ArrayIndexOutOfBoundsException e) {
            // expected
        }
    }

    /**
     * java.io.PushbackReader#unread(int)
     */
    public void test_unreadI() {
        // Test for method void java.io.PushbackReader.unread(int)

        try {
            int c;
            pbr.read();
            c = pbr.read();
            pbr.unread(c);
            assertTrue("Failed to unread char", pbr.read() == c);
        } catch (IOException e) {
            fail("IOException during unread test : " + e.getMessage());
        }
    }

    /**
     * Sets up the fixture, for example, open a network connection. This method
     * is called before a test is executed.
     */
    protected void setUp() {
        pbr = new PushbackReader(new StringReader(pbString), 10);
    }

    /**
     * Tears down the fixture, for example, close a network connection. This
     * method is called after a test is executed.
     */
    protected void tearDown() {
        try {
            pbr.close();
        } catch (IOException e) {
        }
    }
}