Examples with PositionedStoreStream org.apache.derby.impl.jdbc.PositionedStoreStream used on opensource projects

Example 6 with PositionedStoreStream

use of org.apache.derby.impl.jdbc.PositionedStoreStream in project derby by apache.

the class PositionedStoreStreamTest method testSimpleReadSequence.

/**
 * Executes a simple read sequence against the lower case modern latin
 * alphabet, which involves some repositioning.
 */
public void testSimpleReadSequence() throws IOException, StandardException {
    InputStream in = new LoopingAlphabetStream(26);
    PositionedStoreStream pss = new PositionedStoreStream(in);
    assertEquals('a', pss.read());
    pss.reposition(9);
    assertEquals('j', pss.read());
    pss.reposition(10);
    assertEquals('k', pss.read());
    pss.reposition(9);
    assertEquals('j', pss.read());
    pss.reposition(25);
    assertEquals('z', pss.read());
    assertEquals(-1, pss.read());
    pss.reposition(1);
    assertEquals('b', pss.read());
    pss.reposition(1);
    assertEquals('b', pss.read());
}

Example 7 with PositionedStoreStream

use of org.apache.derby.impl.jdbc.PositionedStoreStream in project derby by apache.

the class PositionedStoreStreamTest method testPositionAfterEOFReadArray.

/**
 * Verifies that reading after EOF doesn't change the position.
 */
public void testPositionAfterEOFReadArray() throws IOException, StandardException {
    InputStream in = new LoopingAlphabetStream(10);
    PositionedStoreStream pss = new PositionedStoreStream(in);
    assertEquals(0, pss.getPosition());
    byte[] two = new byte[2];
    for (int i = 0; i < 10; i += 2) {
        assertEquals(2, pss.read(two, 0, 2));
        assertEquals(i + 2, pss.getPosition());
    }
    assertEquals(10, pss.getPosition());
    assertEquals(-1, pss.read(two, 0, 2));
    assertEquals(10, pss.getPosition());
    assertEquals(-1, pss.read(two, 0, 2));
    assertEquals(0, pss.skip(21));
    assertEquals(-1, pss.read());
    assertEquals(10, pss.getPosition());
    pss.resetStream();
    assertEquals(0, pss.getPosition());
}

Example 8 with PositionedStoreStream

use of org.apache.derby.impl.jdbc.PositionedStoreStream in project derby by apache.

the class PositionedStoreStreamTest method testRepositionForwards.

public void testRepositionForwards() throws IOException, StandardException {
    final long length = 20L;
    InputStream in = new LoopingAlphabetStream(length);
    PositionedStoreStream pss = new PositionedStoreStream(in);
    assertEquals(0, pss.getPosition());
    // Position forwards one by one.
    for (int i = 0; i < length; i++) {
        InputStream inComp = new LoopingAlphabetStream(length);
        pss.reposition(i);
        inComp.skip(i);
        assertEquals(inComp.read(), pss.read());
    }
    // Position forwards two by two.
    for (int i = 1; i < length; i += 2) {
        InputStream inComp = new LoopingAlphabetStream(length);
        pss.reposition(i);
        inComp.skip(i);
        assertEquals(inComp.read(), pss.read());
    }
}