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Java example source code file (BitFieldTest.java)

This example Java source code file (BitFieldTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bitfield, bitfieldtest, test

The BitFieldTest.java Java example source code

/*
 * 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.commons.lang3;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import org.junit.Test;

/**
 * Class to test BitField functionality
 */
public class BitFieldTest  {

    private static final BitField bf_multi  = new BitField(0x3F80);
    private static final BitField bf_single = new BitField(0x4000);
    private static final BitField bf_zero = new BitField(0);

    /**
     * test the getValue() method
     */
    @Test
    public void testGetValue() {
        assertEquals(bf_multi.getValue(-1), 127);
        assertEquals(bf_multi.getValue(0), 0);
        assertEquals(bf_single.getValue(-1), 1);
        assertEquals(bf_single.getValue(0), 0);
        assertEquals(bf_zero.getValue(-1), 0);
        assertEquals(bf_zero.getValue(0), 0);
    }

    /**
     * test the getShortValue() method
     */
    @Test
    public void testGetShortValue() {
        assertEquals(bf_multi.getShortValue((short) - 1), (short) 127);
        assertEquals(bf_multi.getShortValue((short) 0), (short) 0);
        assertEquals(bf_single.getShortValue((short) - 1), (short) 1);
        assertEquals(bf_single.getShortValue((short) 0), (short) 0);
        assertEquals(bf_zero.getShortValue((short) -1), (short) 0);
        assertEquals(bf_zero.getShortValue((short) 0), (short) 0);
    }

    /**
     * test the getRawValue() method
     */
    @Test
    public void testGetRawValue() {
        assertEquals(bf_multi.getRawValue(-1), 0x3F80);
        assertEquals(bf_multi.getRawValue(0), 0);
        assertEquals(bf_single.getRawValue(-1), 0x4000);
        assertEquals(bf_single.getRawValue(0), 0);
        assertEquals(bf_zero.getRawValue(-1), 0);
        assertEquals(bf_zero.getRawValue(0), 0);
    }

    /**
     * test the getShortRawValue() method
     */
    @Test
    public void testGetShortRawValue() {
        assertEquals(bf_multi.getShortRawValue((short) - 1), (short) 0x3F80);
        assertEquals(bf_multi.getShortRawValue((short) 0), (short) 0);
        assertEquals(bf_single.getShortRawValue((short) - 1), (short) 0x4000);
        assertEquals(bf_single.getShortRawValue((short) 0), (short) 0);
        assertEquals(bf_zero.getShortRawValue((short) -1), (short) 0);
        assertEquals(bf_zero.getShortRawValue((short) 0), (short) 0);
    }

    /**
     * test the isSet() method
     */
    @Test
    public void testIsSet() {
        assertTrue(!bf_multi.isSet(0));
        assertTrue(!bf_zero.isSet(0));
        for (int j = 0x80; j <= 0x3F80; j += 0x80) {
            assertTrue(bf_multi.isSet(j));
        }
        for (int j = 0x80; j <= 0x3F80; j += 0x80) {
            assertTrue(!bf_zero.isSet(j));
        }
        assertTrue(!bf_single.isSet(0));
        assertTrue(bf_single.isSet(0x4000));
    }

    /**
     * test the isAllSet() method
     */
    @Test
    public void testIsAllSet() {
        for (int j = 0; j < 0x3F80; j += 0x80) {
            assertTrue(!bf_multi.isAllSet(j));
            assertTrue(bf_zero.isAllSet(j));
        }
        assertTrue(bf_multi.isAllSet(0x3F80));
        assertTrue(!bf_single.isAllSet(0));
        assertTrue(bf_single.isAllSet(0x4000));
    }

    /**
     * test the setValue() method
     */
    @Test
    public void testSetValue() {
        for (int j = 0; j < 128; j++) {
            assertEquals(bf_multi.getValue(bf_multi.setValue(0, j)), j);
            assertEquals(bf_multi.setValue(0, j), j << 7);
        }
        for (int j = 0; j < 128; j++) {
          assertEquals(bf_zero.getValue(bf_zero.setValue(0, j)), 0);
          assertEquals(bf_zero.setValue(0, j), 0);
      }

        // verify that excess bits are stripped off
        assertEquals(bf_multi.setValue(0x3f80, 128), 0);
        for (int j = 0; j < 2; j++) {
            assertEquals(bf_single.getValue(bf_single.setValue(0, j)), j);
            assertEquals(bf_single.setValue(0, j), j << 14);
        }

        // verify that excess bits are stripped off
        assertEquals(bf_single.setValue(0x4000, 2), 0);
    }

    /**
     * test the setShortValue() method
     */
    @Test
    public void testSetShortValue() {
        for (int j = 0; j < 128; j++) {
            assertEquals(bf_multi.getShortValue(bf_multi.setShortValue((short) 0, (short) j)), (short) j);
            assertEquals(bf_multi.setShortValue((short) 0, (short) j), (short) (j << 7));
        }
        for (int j = 0; j < 128; j++) {
            assertEquals(bf_zero.getShortValue(bf_zero.setShortValue((short) 0, (short) j)), (short) 0);
            assertEquals(bf_zero.setShortValue((short) 0, (short) j), (short) 0);
        }

        // verify that excess bits are stripped off
        assertEquals(bf_multi.setShortValue((short) 0x3f80, (short) 128), (short) 0);
        for (int j = 0; j < 2; j++) {
            assertEquals(bf_single.getShortValue(bf_single.setShortValue((short) 0, (short) j)), (short) j);
            assertEquals(bf_single.setShortValue((short) 0, (short) j), (short) (j << 14));
        }

        // verify that excess bits are stripped off
        assertEquals(bf_single.setShortValue((short) 0x4000, (short) 2), (short) 0);
    }

    @Test
    public void testByte() {
        assertEquals(0, new BitField(0).setByteBoolean((byte) 0, true));
        assertEquals(1, new BitField(1).setByteBoolean((byte) 0, true));
        assertEquals(2, new BitField(2).setByteBoolean((byte) 0, true));
        assertEquals(4, new BitField(4).setByteBoolean((byte) 0, true));
        assertEquals(8, new BitField(8).setByteBoolean((byte) 0, true));
        assertEquals(16, new BitField(16).setByteBoolean((byte) 0, true));
        assertEquals(32, new BitField(32).setByteBoolean((byte) 0, true));
        assertEquals(64, new BitField(64).setByteBoolean((byte) 0, true));
        assertEquals(-128, new BitField(128).setByteBoolean((byte) 0, true));
        assertEquals(1, new BitField(0).setByteBoolean((byte) 1, false));
        assertEquals(0, new BitField(1).setByteBoolean((byte) 1, false));
        assertEquals(0, new BitField(2).setByteBoolean((byte) 2, false));
        assertEquals(0, new BitField(4).setByteBoolean((byte) 4, false));
        assertEquals(0, new BitField(8).setByteBoolean((byte) 8, false));
        assertEquals(0, new BitField(16).setByteBoolean((byte) 16, false));
        assertEquals(0, new BitField(32).setByteBoolean((byte) 32, false));
        assertEquals(0, new BitField(64).setByteBoolean((byte) 64, false));
        assertEquals(0, new BitField(128).setByteBoolean((byte) 128, false));
        assertEquals(-2, new BitField(1).setByteBoolean((byte) 255, false));
        final byte clearedBit = new BitField(0x40).setByteBoolean((byte) - 63, false);

        assertFalse(new BitField(0x40).isSet(clearedBit));
    }

    /**
     * test the clear() method
     */
    @Test
    public void testClear() {
        assertEquals(bf_multi.clear(-1), 0xFFFFC07F);
        assertEquals(bf_single.clear(-1), 0xFFFFBFFF);
        assertEquals(bf_zero.clear(-1), 0xFFFFFFFF);
    }

    /**
     * test the clearShort() method
     */
    @Test
    public void testClearShort() {
        assertEquals(bf_multi.clearShort((short) - 1), (short) 0xC07F);
        assertEquals(bf_single.clearShort((short) - 1), (short) 0xBFFF);
        assertEquals(bf_zero.clearShort((short) -1), (short) 0xFFFF);
    }

    /**
     * test the set() method
     */
    @Test
    public void testSet() {
        assertEquals(bf_multi.set(0), 0x3F80);
        assertEquals(bf_single.set(0), 0x4000);
        assertEquals(bf_zero.set(0), 0);
    }

    /**
     * test the setShort() method
     */
    @Test
    public void testSetShort() {
        assertEquals(bf_multi.setShort((short) 0), (short) 0x3F80);
        assertEquals(bf_single.setShort((short) 0), (short) 0x4000);
        assertEquals(bf_zero.setShort((short) 0), (short) 0);
    }

    /**
     * test the setBoolean() method
     */
    @Test
    public void testSetBoolean() {
        assertEquals(bf_multi.set(0), bf_multi.setBoolean(0, true));
        assertEquals(bf_single.set(0), bf_single.setBoolean(0, true));
        assertEquals(bf_zero.set(0), bf_zero.setBoolean(0, true));
        assertEquals(bf_multi.clear(-1), bf_multi.setBoolean(-1, false));
        assertEquals(bf_single.clear(-1), bf_single.setBoolean(-1, false));
        assertEquals(bf_zero.clear(-1), bf_zero.setBoolean(-1, false));
    }

    /**
     * test the setShortBoolean() method
     */
    @Test
    public void testSetShortBoolean() {
        assertEquals(bf_multi.setShort((short) 0), bf_multi.setShortBoolean((short) 0, true));
        assertEquals(bf_single.setShort((short) 0), bf_single.setShortBoolean((short) 0, true));
        assertEquals(bf_zero.setShort((short) 0), bf_zero.setShortBoolean((short) 0, true));
        assertEquals(bf_multi.clearShort((short) - 1), bf_multi.setShortBoolean((short) - 1, false));
        assertEquals(bf_single.clearShort((short) - 1), bf_single.setShortBoolean((short) - 1, false));
        assertEquals(bf_zero.clearShort((short) -1), bf_zero.setShortBoolean((short) -1, false));
    }

}

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