android-platform-libcore/luni/src/test/java/org/apache/harmony/luni/tests/java/io/BufferedReaderTest.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.luni.tests.java.io;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.CharArrayReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PipedReader;
import java.io.Reader;
import java.io.StringReader;

import junit.framework.TestCase;
import tests.support.Support_StringReader;

public class BufferedReaderTest extends TestCase {

	BufferedReader br;

	String testString = "Test_All_Tests\nTest_java_io_BufferedInputStream\nTest_java_io_BufferedOutputStream\nTest_java_io_ByteArrayInputStream\nTest_java_io_ByteArrayOutputStream\nTest_java_io_DataInputStream\nTest_java_io_File\nTest_java_io_FileDescriptor\nTest_java_io_FileInputStream\nTest_java_io_FileNotFoundException\nTest_java_io_FileOutputStream\nTest_java_io_FilterInputStream\nTest_java_io_FilterOutputStream\nTest_java_io_InputStream\nTest_java_io_IOException\nTest_java_io_OutputStream\nTest_java_io_PrintStream\nTest_java_io_RandomAccessFile\nTest_java_io_SyncFailedException\nTest_java_lang_AbstractMethodError\nTest_java_lang_ArithmeticException\nTest_java_lang_ArrayIndexOutOfBoundsException\nTest_java_lang_ArrayStoreException\nTest_java_lang_Boolean\nTest_java_lang_Byte\nTest_java_lang_Character\nTest_java_lang_Class\nTest_java_lang_ClassCastException\nTest_java_lang_ClassCircularityError\nTest_java_lang_ClassFormatError\nTest_java_lang_ClassLoader\nTest_java_lang_ClassNotFoundException\nTest_java_lang_CloneNotSupportedException\nTest_java_lang_Double\nTest_java_lang_Error\nTest_java_lang_Exception\nTest_java_lang_ExceptionInInitializerError\nTest_java_lang_Float\nTest_java_lang_IllegalAccessError\nTest_java_lang_IllegalAccessException\nTest_java_lang_IllegalArgumentException\nTest_java_lang_IllegalMonitorStateException\nTest_java_lang_IllegalThreadStateException\nTest_java_lang_IncompatibleClassChangeError\nTest_java_lang_IndexOutOfBoundsException\nTest_java_lang_InstantiationError\nTest_java_lang_InstantiationException\nTest_java_lang_Integer\nTest_java_lang_InternalError\nTest_java_lang_InterruptedException\nTest_java_lang_LinkageError\nTest_java_lang_Long\nTest_java_lang_Math\nTest_java_lang_NegativeArraySizeException\nTest_java_lang_NoClassDefFoundError\nTest_java_lang_NoSuchFieldError\nTest_java_lang_NoSuchMethodError\nTest_java_lang_NullPointerException\nTest_java_lang_Number\nTest_java_lang_NumberFormatException\nTest_java_lang_Object\nTest_java_lang_OutOfMemoryError\nTest_java_lang_RuntimeException\nTest_java_lang_SecurityManager\nTest_java_lang_Short\nTest_java_lang_StackOverflowError\nTest_java_lang_String\nTest_java_lang_StringBuffer\nTest_java_lang_StringIndexOutOfBoundsException\nTest_java_lang_System\nTest_java_lang_Thread\nTest_java_lang_ThreadDeath\nTest_java_lang_ThreadGroup\nTest_java_lang_Throwable\nTest_java_lang_UnknownError\nTest_java_lang_UnsatisfiedLinkError\nTest_java_lang_VerifyError\nTest_java_lang_VirtualMachineError\nTest_java_lang_vm_Image\nTest_java_lang_vm_MemorySegment\nTest_java_lang_vm_ROMStoreException\nTest_java_lang_vm_VM\nTest_java_lang_Void\nTest_java_net_BindException\nTest_java_net_ConnectException\nTest_java_net_DatagramPacket\nTest_java_net_DatagramSocket\nTest_java_net_DatagramSocketImpl\nTest_java_net_InetAddress\nTest_java_net_NoRouteToHostException\nTest_java_net_PlainDatagramSocketImpl\nTest_java_net_PlainSocketImpl\nTest_java_net_Socket\nTest_java_net_SocketException\nTest_java_net_SocketImpl\nTest_java_net_SocketInputStream\nTest_java_net_SocketOutputStream\nTest_java_net_UnknownHostException\nTest_java_util_ArrayEnumerator\nTest_java_util_Date\nTest_java_util_EventObject\nTest_java_util_HashEnumerator\nTest_java_util_Hashtable\nTest_java_util_Properties\nTest_java_util_ResourceBundle\nTest_java_util_tm\nTest_java_util_Vector\n";

        /**
         * The spec says that BufferedReader.readLine() considers only "\r", "\n"
         * and "\r\n" to be line separators. We must not permit additional separator
         * characters.
        */
        public void test_readLine_IgnoresEbcdic85Characters() throws IOException {
            assertLines("A\u0085B", "A\u0085B");
        }

        public void test_readLine_Separators() throws IOException {
            assertLines("A\nB\nC", "A", "B", "C");
            assertLines("A\rB\rC", "A", "B", "C");
            assertLines("A\r\nB\r\nC", "A", "B", "C");
            assertLines("A\n\rB\n\rC", "A", "", "B", "", "C");
            assertLines("A\n\nB\n\nC", "A", "", "B", "", "C");
            assertLines("A\r\rB\r\rC", "A", "", "B", "", "C");
            assertLines("A\n\n", "A", "");
            assertLines("A\n\r", "A", "");
            assertLines("A\r\r", "A", "");
            assertLines("A\r\n", "A");
            assertLines("A\r\n\r\n", "A", "");
        }

        private void assertLines(String in, String... lines) throws IOException {
            BufferedReader bufferedReader
                = new BufferedReader(new Support_StringReader(in));
            for (String line : lines) {
                assertEquals(line, bufferedReader.readLine());
            }
            assertNull(bufferedReader.readLine());
        }

	/**
	 * @tests java.io.BufferedReader#BufferedReader(java.io.Reader)
	 */
	public void test_ConstructorLjava_io_Reader() {
		// Test for method java.io.BufferedReader(java.io.Reader)
		assertTrue("Used in tests", true);
	}

	/**
	 * @tests java.io.BufferedReader#BufferedReader(java.io.Reader, int)
	 */
	public void test_ConstructorLjava_io_ReaderI() {
		// Test for method java.io.BufferedReader(java.io.Reader, int)
		assertTrue("Used in tests", true);
	}

	/**
	 * @tests java.io.BufferedReader#close()
	 */
	public void test_close() {
		// Test for method void java.io.BufferedReader.close()
		try {
			br = new BufferedReader(new Support_StringReader(testString));
			br.close();
			br.read();
			fail("Read on closed stream");
		} catch (IOException x) {
			return;
		}
	}

	/**
	 * @tests java.io.BufferedReader#mark(int)
	 */
	public void test_markI() throws IOException {
		// Test for method void java.io.BufferedReader.mark(int)
		char[] buf = null;
		br = new BufferedReader(new Support_StringReader(testString));
		br.skip(500);
		br.mark(1000);
		br.skip(250);
		br.reset();
		buf = new char[testString.length()];
		br.read(buf, 0, 500);
		assertTrue("Failed to set mark properly", testString.substring(500,
				1000).equals(new String(buf, 0, 500)));

		try {
			br = new BufferedReader(new Support_StringReader(testString), 800);
			br.skip(500);
			br.mark(250);
			br.read(buf, 0, 1000);
			br.reset();
			fail("Failed to invalidate mark properly");
		} catch (IOException x) {
		    // Expected
		}

		char[] chars = new char[256];
		for (int i = 0; i < 256; i++)
			chars[i] = (char) i;
		Reader in = new BufferedReader(new Support_StringReader(new String(
				chars)), 12);

		in.skip(6);
		in.mark(14);
		in.read(new char[14], 0, 14);
		in.reset();
		assertTrue("Wrong chars", in.read() == (char) 6
				&& in.read() == (char) 7);

		in = new BufferedReader(new Support_StringReader(new String(chars)), 12);
		in.skip(6);
		in.mark(8);
		in.skip(7);
		in.reset();
		assertTrue("Wrong chars 2", in.read() == (char) 6
				&& in.read() == (char) 7);
		
        BufferedReader br = new BufferedReader(new StringReader("01234"), 2);
        br.mark(3);
        char[] carray = new char[3];
        int result = br.read(carray);
        assertEquals(3, result);
        assertEquals("Assert 0:", '0', carray[0]);
        assertEquals("Assert 1:", '1', carray[1]);
        assertEquals("Assert 2:", '2', carray[2]);
        assertEquals("Assert 3:", '3', br.read());

        br = new BufferedReader(new StringReader("01234"), 2);
        br.mark(3);
        carray = new char[4];
        result = br.read(carray);
        assertEquals("Assert 4:", 4, result);
        assertEquals("Assert 5:", '0', carray[0]);
        assertEquals("Assert 6:", '1', carray[1]);
        assertEquals("Assert 7:", '2', carray[2]);
        assertEquals("Assert 8:", '3', carray[3]);
        assertEquals("Assert 9:", '4', br.read());
        assertEquals("Assert 10:", -1, br.read());

        BufferedReader reader = new BufferedReader(new StringReader("01234"));
        reader.mark(Integer.MAX_VALUE);
        reader.read();
        reader.close();
	}

	/**
	 * @tests java.io.BufferedReader#markSupported()
	 */
	public void test_markSupported() {
		// Test for method boolean java.io.BufferedReader.markSupported()
		br = new BufferedReader(new Support_StringReader(testString));
		assertTrue("markSupported returned false", br.markSupported());
	}

	/**
	 * @tests java.io.BufferedReader#read()
	 */
	public void test_read() throws IOException {
		// Test for method int java.io.BufferedReader.read()
		try {
			br = new BufferedReader(new Support_StringReader(testString));
			int r = br.read();
			assertTrue("Char read improperly", testString.charAt(0) == r);
			br = new BufferedReader(new Support_StringReader(new String(
					new char[] { '\u8765' })));
			assertTrue("Wrong double byte character", br.read() == '\u8765');
		} catch (java.io.IOException e) {
			fail("Exception during read test");
		}

		char[] chars = new char[256];
		for (int i = 0; i < 256; i++)
			chars[i] = (char) i;
		Reader in = new BufferedReader(new Support_StringReader(new String(
				chars)), 12);
		try {
			assertEquals("Wrong initial char", 0, in.read()); // Fill the
			// buffer
			char[] buf = new char[14];
			in.read(buf, 0, 14); // Read greater than the buffer
			assertTrue("Wrong block read data", new String(buf)
					.equals(new String(chars, 1, 14)));
			assertEquals("Wrong chars", 15, in.read()); // Check next byte
		} catch (IOException e) {
			fail("Exception during read test 2:" + e);
		}
		
		// regression test for HARMONY-841
		assertTrue(new BufferedReader(new CharArrayReader(new char[5], 1, 0), 2).read() == -1);
	}

	/**
	 * @tests java.io.BufferedReader#read(char[], int, int)
	 */
	public void test_read$CII() throws Exception{
		char[] ca = new char[2];
		BufferedReader toRet = new BufferedReader(new InputStreamReader(
				new ByteArrayInputStream(new byte[0])));
		
		/* Null buffer should throw NPE even when len == 0 */
		try {
			toRet.read(null, 1, 0);
			fail("null buffer reading zero bytes should throw NPE");
		} catch (NullPointerException e) {
			//expected
		}
		
		try {
			toRet.close();
		} catch (IOException e) {
			fail("unexpected 1: " + e);
		}
		
		try {
			toRet.read(null, 1, 0);
			fail("null buffer reading zero bytes on closed stream should throw IOException");
		} catch (IOException e) {
			//expected
		}

		/* Closed reader should throw IOException reading zero bytes */
		try {
			toRet.read(ca, 0, 0);
			fail("Reading zero bytes on a closed reader should not work");
		} catch (IOException e) {
			// expected
		}

		/*
		 * Closed reader should throw IOException in preference to index out of
		 * bounds
		 */
		try {
			// Read should throw IOException before
			// ArrayIndexOutOfBoundException
			toRet.read(ca, 1, 5);
			fail("IOException should have been thrown");
		} catch (IOException e) {
			// expected
		}

		// Test to ensure that a drained stream returns 0 at EOF
		toRet = new BufferedReader(new InputStreamReader(
				new ByteArrayInputStream(new byte[2])));
		try {
			assertEquals("Emptying the reader should return two bytes", 2,
					toRet.read(ca, 0, 2));
			assertEquals("EOF on a reader should be -1", -1, toRet.read(ca, 0,
					2));
			assertEquals("Reading zero bytes at EOF should work", 0, toRet
					.read(ca, 0, 0));
		} catch (IOException ex) {
			fail("Unexpected IOException : " + ex.getLocalizedMessage());
		}

		// Test for method int java.io.BufferedReader.read(char [], int, int)
		try {
			char[] buf = new char[testString.length()];
			br = new BufferedReader(new Support_StringReader(testString));
			br.read(buf, 50, 500);
			assertTrue("Chars read improperly", new String(buf, 50, 500)
					.equals(testString.substring(0, 500)));
		} catch (java.io.IOException e) {
			fail("Exception during read test");
		}

		BufferedReader bufin = new BufferedReader(new Reader() {
			int size = 2, pos = 0;

			char[] contents = new char[size];

			public int read() throws IOException {
				if (pos >= size)
					throw new IOException("Read past end of data");
				return contents[pos++];
			}

			public int read(char[] buf, int off, int len) throws IOException {
				if (pos >= size)
					throw new IOException("Read past end of data");
				int toRead = len;
				if (toRead > (size - pos))
					toRead = size - pos;
				System.arraycopy(contents, pos, buf, off, toRead);
				pos += toRead;
				return toRead;
			}

			public boolean ready() throws IOException {
				return size - pos > 0;
			}

			public void close() throws IOException {
			}
		});
		try {
			bufin.read();
			int result = bufin.read(new char[2], 0, 2);
			assertTrue("Incorrect result: " + result, result == 1);
		} catch (IOException e) {
			fail("Unexpected: " + e);
		}

        //regression for HARMONY-831
        try{
            new BufferedReader(new PipedReader(), 9).read(new char[] {}, 7, 0);
            fail("should throw IndexOutOfBoundsException");
        }catch(IndexOutOfBoundsException e){
        }

        // Regression for HARMONY-54
        char[] ch = {};
        BufferedReader reader = new BufferedReader(new CharArrayReader(ch));
        try {
            // Check exception thrown when the reader is open.
            reader.read(null, 1, 0);
            fail("Assert 0: NullPointerException expected");
        } catch (NullPointerException e) {
            // Expected
        }

        // Now check IOException is thrown in preference to
        // NullPointerexception when the reader is closed.
        reader.close();
        try {
            reader.read(null, 1, 0);
            fail("Assert 1: IOException expected");
        } catch (IOException e) {
            // Expected
        }

        try {
            // And check that the IOException is thrown before
            // ArrayIndexOutOfBoundException
            reader.read(ch, 0, 42);
            fail("Assert 2: IOException expected");
        } catch (IOException e) {
            // expected
        }
	}

	/**
	 * @tests java.io.BufferedReader#read(char[], int, int)
	 */
	public void test_read_$CII_Exception() throws IOException {
		br = new BufferedReader(new Support_StringReader(testString));
		char[] nullCharArray = null;
		char[] charArray = testString.toCharArray();
		
		try {
			br.read(nullCharArray, -1, -1);
			fail("should throw IndexOutOfBoundsException");
		} catch (IndexOutOfBoundsException e) {
			// expected
		}
		
		try {
			br.read(nullCharArray, -1, 0);
			fail("should throw IndexOutOfBoundsException");
		} catch (IndexOutOfBoundsException e) {
			// expected
		}

		try {
			br.read(nullCharArray, 0, -1);
			fail("should throw NullPointerException");
		} catch (NullPointerException e) {
			// expected
		}

		try {
			br.read(nullCharArray, 0, 0);
			fail("should throw NullPointerException");
		} catch (NullPointerException e) {
			// expected
		}
		
		try {
			br.read(nullCharArray, 0, 1);
			fail("should throw NullPointerException");
		} catch (NullPointerException e) {
			// expected
		}
		
		try {
			br.read(charArray, -1, -1);
			fail("should throw IndexOutOfBoundsException");
		} catch (IndexOutOfBoundsException e) {
			// expected
		}

		try {
			br.read(charArray, -1, 0);
			fail("should throw IndexOutOfBoundsException");
		} catch (IndexOutOfBoundsException e) {
			// expected
		}

		br.read(charArray, 0, 0);
        br.read(charArray, 0, charArray.length);
        br.read(charArray, charArray.length, 0);
		
		try {
			br.read(charArray, charArray.length + 1, 0);
			fail("should throw IndexOutOfBoundsException");
		} catch (IndexOutOfBoundsException e) {
			//expected
		}
		
		try {
			br.read(charArray, charArray.length + 1, 1);
			fail("should throw IndexOutOfBoundsException");
		} catch (IndexOutOfBoundsException e) {
			//expected
		}

		br.close();

		try {
			br.read(nullCharArray, -1, -1);
			fail("should throw IOException");
		} catch (IOException e) {
			// expected
		}

		try {
			br.read(charArray, -1, 0);
			fail("should throw IOException");
		} catch (IOException e) {
			// expected
		}

		try {
			br.read(charArray, 0, -1);
			fail("should throw IOException");
		} catch (IOException e) {
			// expected
		}
	}
	/**
	 * @tests java.io.BufferedReader#readLine()
	 */
	public void test_readLine() {
		// Test for method java.lang.String java.io.BufferedReader.readLine()
		try {
			br = new BufferedReader(new Support_StringReader(testString));
			String r = br.readLine();
			assertEquals("readLine returned incorrect string", "Test_All_Tests", r
					);
		} catch (java.io.IOException e) {
			fail("Exception during readLine test");
		}
	}

	/**
	 * @tests java.io.BufferedReader#ready()
	 */
	public void test_ready() {
		// Test for method boolean java.io.BufferedReader.ready()
		try {
			br = new BufferedReader(new Support_StringReader(testString));
			assertTrue("ready returned false", br.ready());
		} catch (java.io.IOException e) {
			fail("Exception during ready test" + e.toString());
		}
	}

	/**
	 * @tests java.io.BufferedReader#reset()
	 */
	public void test_reset() {
		// Test for method void java.io.BufferedReader.reset()
		try {
			br = new BufferedReader(new Support_StringReader(testString));
			br.skip(500);
			br.mark(900);
			br.skip(500);
			br.reset();
			char[] buf = new char[testString.length()];
			br.read(buf, 0, 500);
			assertTrue("Failed to reset properly", testString.substring(500,
					1000).equals(new String(buf, 0, 500)));
		} catch (java.io.IOException e) {
			fail("Exception during reset test");
		}
		try {
			br = new BufferedReader(new Support_StringReader(testString));
			br.skip(500);
			br.reset();
			fail("Reset succeeded on unmarked stream");
		} catch (IOException x) {
			return;

		}
	}

    public void test_reset_IOException() throws Exception {
        int[] expected = new int[] { '1', '2', '3', '4', '5', '6', '7', '8',
                '9', '0', -1 };
        br = new BufferedReader(new Support_StringReader("1234567890"), 9);
        br.mark(9);
        for (int i = 0; i < 11; i++) {
            assertEquals(expected[i], br.read());
        }
        try {
            br.reset();
            fail("should throw IOException");
        } catch (IOException e) {
            // Expected
        }
        for (int i = 0; i < 11; i++) {
            assertEquals(-1, br.read());
        }

        br = new BufferedReader(new Support_StringReader("1234567890"));
        br.mark(10);
        for (int i = 0; i < 10; i++) {
            assertEquals(expected[i], br.read());
        }
        br.reset();
        for (int i = 0; i < 11; i++) {
            assertEquals(expected[i], br.read());
        }
    }

	/**
	 * @tests java.io.BufferedReader#skip(long)
	 */
	public void test_skipJ() {
		// Test for method long java.io.BufferedReader.skip(long)
		try {
			br = new BufferedReader(new Support_StringReader(testString));
			br.skip(500);
			char[] buf = new char[testString.length()];
			br.read(buf, 0, 500);
			assertTrue("Failed to set skip properly", testString.substring(500,
					1000).equals(new String(buf, 0, 500)));
		} catch (java.io.IOException e) {
			fail("Exception during skip test");
		}

	}

	/**
	 * Sets up the fixture, for example, open a network connection. This method
	 * is called before a test is executed.
	 */
	protected void setUp() {
	}

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