Examples of java.io.PipedWriter

java.io.PipedWriter
PipedWriter is a class which places information on a communications pipe. When two threads want to pass data back and forth, one creates a piped writer and the other creates a piped reader. @see PipedReader

    /**
     * @tests java.io.PipedReader#PipedReader(java.io.PipedWriter)
     */
    public void test_ConstructorLjava_io_PipedWriter() throws IOException {
        // Test for method java.io.PipedReader(java.io.PipedWriter)
        preader = new PipedReader(new PipedWriter());
    }

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    /**
     * @tests java.io.PipedReader#read(char[], int, int)
     * Regression for HARMONY-387
     */
    public void test_read$CII_2() throws IOException{
        PipedWriter pw = new PipedWriter();
        PipedReader obj = null;
        try {
            obj = new PipedReader(pw);
            obj.read(new char[0], (int) 0, (int) -1);
            fail("IndexOutOfBoundsException expected");

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    /**
     * @tests java.io.PipedReader#read(char[], int, int)
     */
    public void test_read$CII_3() throws IOException {
        PipedWriter pw = new PipedWriter();
        PipedReader obj = null;
        try {
            obj = new PipedReader(pw);
            obj.read(new char[0], (int) -1, (int) 0);
            fail("IndexOutOfBoundsException expected");

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    /**
     * @tests java.io.PipedReader#read(char[], int, int)
     */
    public void test_read$CII_4() throws IOException {
        PipedWriter pw = new PipedWriter();
        PipedReader obj = null;
        try {
            obj = new PipedReader(pw);
            obj.read(new char[0], (int) -1, (int) -1);
            fail("IndexOutOfBoundsException expected");

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    /**
     * @tests java.io.PipedReader#read(char[], int, int)
     */
    public void test_read_$CII_IOException() throws IOException {
        PipedWriter pw = new PipedWriter();
        PipedReader pr = new PipedReader(pw);
        char[] buf = null;
        pr.close();
        try {
            pr.read(buf, 0, 10);
            fail("Should throws IOException"); //$NON-NLS-1$
        } catch (IOException e) {
            // expected
        } finally {
            pw = null;
            pr = null;
        }
        
        pr = new PipedReader();
        buf = null;
        pr.close();
        try {
            pr.read(buf, 0, 10);
            fail("Should throws IOException"); //$NON-NLS-1$
        } catch (IOException e) {
            // expected
        } finally {
            pr = null;
        }
        
        pw = new PipedWriter();
        pr = new PipedReader(pw);
        buf = new char[10];
        pr.close();
        try {
            pr.read(buf, -1, 0);
            fail("Should throws IOException"); //$NON-NLS-1$
        } catch (IOException e) {
            // expected
        } finally {
            pw = null;
            pr = null;
        }
        
        pw = new PipedWriter();
        pr = new PipedReader(pw);
        buf = new char[10];
        pr.close();
        try {
            pr.read(buf, 0, -1);
            fail("Should throws IOException"); //$NON-NLS-1$
        } catch (IOException e) {
            // expected
        } finally {
            pw = null;
            pr = null;
        }
        
        pw = new PipedWriter();
        pr = new PipedReader(pw);
        buf = new char[10];
        pr.close();
        try {
            pr.read(buf, 1, 10);
            fail("Should throws IOException"); //$NON-NLS-1$
        } catch (IOException e) {
            // expected
        } finally {
            pw = null;
            pr = null;
        }
        
        pw = new PipedWriter();
        pr = new PipedReader(pw);
        pr.close();
        try {
            pr.read(new char[0], -1, -1);
            fail("should throw IOException"); //$NON-NLS-1$
        } catch (IOException e) {
            // expected
        } finally {
            pw = null;
            pr = null;
        }
        
        pw = new PipedWriter();
        pr = new PipedReader(pw);
        pr.close();
        try {
            pr.read(null, 0, 1);
            fail("should throw IOException"); //$NON-NLS-1$
        } catch (IOException e) {
            // expected
        } finally {
            pw = null;
            pr = null;
        }
        
        pw = new PipedWriter();
        pr = new PipedReader(pw);
        try {
            pr.read(null, -1, 1);
            fail("should throw IndexOutOfBoundsException"); //$NON-NLS-1$
        } catch (IndexOutOfBoundsException e) {
            // expected
        } finally {
            pw = null;
            pr = null;
        }
        
        pw = new PipedWriter();
        pr = new PipedReader(pw);
        try {
            pr.read(null, 0, -1);
            fail("should throw NullPointerException"); //$NON-NLS-1$
        } catch (NullPointerException e) {
            // expected
        } finally {
            pw = null;
            pr = null;
        }
        
        pw = new PipedWriter();
        pr = new PipedReader(pw);
        try {
            pr.read(new char[10], 11, 0);
            fail("should throw IndexOutOfBoundsException"); //$NON-NLS-1$
        } catch (IndexOutOfBoundsException e) {
            // expected
        } finally {
            pw = null;
            pr = null;
        }
        
        pw = new PipedWriter();
        pr = new PipedReader(pw);
        try {
            pr.read(null, 1, 0);
            fail("should throw NullPointerException"); //$NON-NLS-1$
        } catch (NullPointerException e) {

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  static class PWriter implements Runnable {
    public PipedWriter pw;


    public PWriter(PipedReader reader) {
      try {
        pw = new PipedWriter(reader);
      } catch (Exception e) {
        System.out.println("Couldn't create writer");
      }
    }

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        System.out.println("Couldn't create writer");
      }
    }


    public PWriter() {
      pw = new PipedWriter();
    }

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    public void test_ConstructorLjava_io_PipedReader() throws Exception {
        // Test for method java.io.PipedWriter(java.io.PipedReader)
        char[] buf = new char[10];
        "HelloWorld".getChars(0, 10, buf, 0);
        PipedReader rd = new PipedReader();
        pw = new PipedWriter(rd);
        rdrThread = new Thread(reader = new PReader(rd), "Constructor(Reader)");
        rdrThread.start();
        pw.write(buf);
        pw.close();
        rdrThread.join(500);

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    public void test_close() throws Exception {
        // Test for method void java.io.PipedWriter.close()
        char[] buf = new char[10];
        "HelloWorld".getChars(0, 10, buf, 0);
        PipedReader rd = new PipedReader();
        pw = new PipedWriter(rd);
        reader = new PReader(rd);
        pw.close();
        try {
            pw.write(buf);
            fail("Should have thrown exception when attempting to write to closed writer.");

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    public void test_connectLjava_io_PipedReader() throws Exception {
        // Test for method void java.io.PipedWriter.connect(java.io.PipedReader)
        char[] buf = new char[10];
        "HelloWorld".getChars(0, 10, buf, 0);
        PipedReader rd = new PipedReader();
        pw = new PipedWriter();
        pw.connect(rd);
        rdrThread = new Thread(reader = new PReader(rd), "connect");
        rdrThread.start();
        pw.write(buf);
        pw.close();

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