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Java example source code file (AsciiStringCharacterTest.java)

This example Java source code file (AsciiStringCharacterTest.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

asciistring, asciistringcharactertest, asfdsf, charbuffer, charset, foo, nio, random, string, stringbuilder, test, util

The AsciiStringCharacterTest.java Java example source code

/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project 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 io.netty.util;

import org.junit.Assert;
import org.junit.Test;

import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.util.Random;

import static io.netty.util.AsciiString.contains;
import static io.netty.util.AsciiString.containsIgnoreCase;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;

/**
 * Test character encoding and case insensitivity for the {@link AsciiString} class
 */
public class AsciiStringCharacterTest {
    private static final Random r = new Random();

    @Test
    public void testGetBytesStringBuilder() {
        final StringBuilder b = new StringBuilder();
        for (int i = 0; i < 1 << 16; ++i) {
            b.append("eéaà");
        }
        final String bString = b.toString();
        final Charset[] charsets = CharsetUtil.values();
        for (int i = 0; i < charsets.length; ++i) {
            final Charset charset = charsets[i];
            byte[] expected = bString.getBytes(charset);
            byte[] actual = new AsciiString(b, charset).toByteArray();
            assertArrayEquals("failure for " + charset, expected, actual);
        }
    }

    @Test
    public void testGetBytesString() {
        final StringBuilder b = new StringBuilder();
        for (int i = 0; i < 1 << 16; ++i) {
            b.append("eéaà");
        }
        final String bString = b.toString();
        final Charset[] charsets = CharsetUtil.values();
        for (int i = 0; i < charsets.length; ++i) {
            final Charset charset = charsets[i];
            byte[] expected = bString.getBytes(charset);
            byte[] actual = new AsciiString(bString, charset).toByteArray();
            assertArrayEquals("failure for " + charset, expected, actual);
        }
    }

    @Test
    public void testGetBytesAsciiString() {
        final StringBuilder b = new StringBuilder();
        for (int i = 0; i < 1 << 16; ++i) {
            b.append("eéaà");
        }
        final String bString = b.toString();
        // The AsciiString class actually limits the Charset to ISO_8859_1
        byte[] expected = bString.getBytes(CharsetUtil.ISO_8859_1);
        byte[] actual = new AsciiString(bString).toByteArray();
        assertArrayEquals(expected, actual);
    }

    @Test
    public void testComparisonWithString() {
        String string = "shouldn't fail";
        AsciiString ascii = new AsciiString(string.toCharArray());
        Assert.assertEquals(string, ascii.toString());
    }

    @Test
    public void subSequenceTest() {
        byte[] init = {'t', 'h', 'i', 's', ' ', 'i', 's', ' ', 'a', ' ', 't', 'e', 's', 't' };
        AsciiString ascii = new AsciiString(init);
        final int start = 2;
        final int end = init.length;
        AsciiString sub1 = ascii.subSequence(start, end, false);
        AsciiString sub2 = ascii.subSequence(start, end, true);
        assertEquals(sub1.hashCode(), sub2.hashCode());
        assertEquals(sub1, sub2);
        for (int i = start; i < end; ++i) {
            assertEquals(init[i], sub1.byteAt(i - start));
        }
    }

    @Test
    public void testContains() {
        String[] falseLhs = {null, "a", "aa", "aaa" };
        String[] falseRhs = {null, "b", "ba", "baa" };
        for (int i = 0; i < falseLhs.length; ++i) {
            for (int j = 0; j < falseRhs.length; ++j) {
                assertContains(falseLhs[i], falseRhs[i], false, false);
            }
        }

        assertContains("", "", true, true);
        assertContains("AsfdsF", "", true, true);
        assertContains("", "b", false, false);
        assertContains("a", "a", true, true);
        assertContains("a", "b", false, false);
        assertContains("a", "A", false, true);
        String b = "xyz";
        String a = b;
        assertContains(a, b, true, true);

        a = "a" + b;
        assertContains(a, b, true, true);

        a = b + "a";
        assertContains(a, b, true, true);

        a = "a" + b + "a";
        assertContains(a, b, true, true);

        b = "xYz";
        a = "xyz";
        assertContains(a, b, false, true);

        b = "xYz";
        a = "xyzxxxXyZ" + b + "aaa";
        assertContains(a, b, true, true);

        b = "foOo";
        a = "fooofoO";
        assertContains(a, b, false, true);

        b = "Content-Equals: 10000";
        a = "content-equals: 1000";
        assertContains(a, b, false, false);
        a += "0";
        assertContains(a, b, false, true);
    }

    private static void assertContains(String a, String b, boolean caseSensitiveEquals, boolean caseInsenstaiveEquals) {
        assertEquals(caseSensitiveEquals, contains(a, b));
        assertEquals(caseInsenstaiveEquals, containsIgnoreCase(a, b));
    }

    @Test
    public void testCaseSensitivity() {
        int i = 0;
        for (; i < 32; i++) {
            doCaseSensitivity(i);
        }
        final int min = i;
        final int max = 4000;
        final int len = r.nextInt((max - min) + 1) + min;
        doCaseSensitivity(len);
    }

    private static void doCaseSensitivity(int len) {
        // Build an upper case and lower case string
        final int upperA = 'A';
        final int upperZ = 'Z';
        final int upperToLower = (int) 'a' - upperA;
        byte[] lowerCaseBytes = new byte[len];
        StringBuilder upperCaseBuilder = new StringBuilder(len);
        for (int i = 0; i < len; ++i) {
            char upper = (char) (r.nextInt((upperZ - upperA) + 1) + upperA);
            upperCaseBuilder.append(upper);
            lowerCaseBytes[i] = (byte) (upper + upperToLower);
        }
        String upperCaseString = upperCaseBuilder.toString();
        String lowerCaseString = new String(lowerCaseBytes);
        AsciiString lowerCaseAscii = new AsciiString(lowerCaseBytes, false);
        AsciiString upperCaseAscii = new AsciiString(upperCaseString);
        final String errorString = "len: " + len;
        // Test upper case hash codes are equal
        final int upperCaseExpected = upperCaseAscii.hashCode();
        assertEquals(errorString, upperCaseExpected, AsciiString.hashCode(upperCaseBuilder));
        assertEquals(errorString, upperCaseExpected, AsciiString.hashCode(upperCaseString));
        assertEquals(errorString, upperCaseExpected, upperCaseAscii.hashCode());

        // Test lower case hash codes are equal
        final int lowerCaseExpected = lowerCaseAscii.hashCode();
        assertEquals(errorString, lowerCaseExpected, AsciiString.hashCode(lowerCaseAscii));
        assertEquals(errorString, lowerCaseExpected, AsciiString.hashCode(lowerCaseString));
        assertEquals(errorString, lowerCaseExpected, lowerCaseAscii.hashCode());

        // Test case insensitive hash codes are equal
        final int expectedCaseInsensitive = lowerCaseAscii.hashCode();
        assertEquals(errorString, expectedCaseInsensitive, AsciiString.hashCode(upperCaseBuilder));
        assertEquals(errorString, expectedCaseInsensitive, AsciiString.hashCode(upperCaseString));
        assertEquals(errorString, expectedCaseInsensitive, AsciiString.hashCode(lowerCaseString));
        assertEquals(errorString, expectedCaseInsensitive, AsciiString.hashCode(lowerCaseAscii));
        assertEquals(errorString, expectedCaseInsensitive, AsciiString.hashCode(upperCaseAscii));
        assertEquals(errorString, expectedCaseInsensitive, lowerCaseAscii.hashCode());
        assertEquals(errorString, expectedCaseInsensitive, upperCaseAscii.hashCode());

        // Test that opposite cases are equal
        assertEquals(errorString, lowerCaseAscii.hashCode(), AsciiString.hashCode(upperCaseString));
        assertEquals(errorString, upperCaseAscii.hashCode(), AsciiString.hashCode(lowerCaseString));
    }

    @Test
    public void caseInsensitiveHasherCharBuffer() {
        String s1 = new String("TRANSFER-ENCODING");
        char[] array = new char[128];
        final int offset = 100;
        for (int i = 0; i < s1.length(); ++i) {
            array[offset + i] = s1.charAt(i);
        }
        CharBuffer buffer = CharBuffer.wrap(array, offset, s1.length());
        assertEquals(AsciiString.hashCode(s1), AsciiString.hashCode(buffer));
    }

    @Test
    public void testBooleanUtilityMethods() {
        assertTrue(new AsciiString(new byte[] { 1 }).parseBoolean());
        assertFalse(AsciiString.EMPTY_STRING.parseBoolean());
        assertFalse(new AsciiString(new byte[] { 0 }).parseBoolean());
        assertTrue(new AsciiString(new byte[] { 5 }).parseBoolean());
        assertTrue(new AsciiString(new byte[] { 2, 0 }).parseBoolean());
    }

    @Test
    public void testEqualsIgnoreCase() {
        assertThat(AsciiString.contentEqualsIgnoreCase(null, null), is(true));
        assertThat(AsciiString.contentEqualsIgnoreCase(null, "foo"), is(false));
        assertThat(AsciiString.contentEqualsIgnoreCase("bar", null), is(false));
        assertThat(AsciiString.contentEqualsIgnoreCase("FoO", "fOo"), is(true));

        // Test variations (Ascii + String, Ascii + Ascii, String + Ascii)
        assertThat(AsciiString.contentEqualsIgnoreCase(new AsciiString("FoO"), "fOo"), is(true));
        assertThat(AsciiString.contentEqualsIgnoreCase(new AsciiString("FoO"), new AsciiString("fOo")), is(true));
        assertThat(AsciiString.contentEqualsIgnoreCase("FoO", new AsciiString("fOo")), is(true));

        // Test variations (Ascii + String, Ascii + Ascii, String + Ascii)
        assertThat(AsciiString.contentEqualsIgnoreCase(new AsciiString("FoO"), "bAr"), is(false));
        assertThat(AsciiString.contentEqualsIgnoreCase(new AsciiString("FoO"), new AsciiString("bAr")), is(false));
        assertThat(AsciiString.contentEqualsIgnoreCase("FoO", new AsciiString("bAr")), is(false));
    }

    @Test
    public void testIndexOfIgnoreCase() {
        assertEquals(-1, AsciiString.indexOfIgnoreCase(null, "abc", 1));
        assertEquals(-1, AsciiString.indexOfIgnoreCase("abc", null, 1));
        assertEquals(0, AsciiString.indexOfIgnoreCase("", "", 0));
        assertEquals(0, AsciiString.indexOfIgnoreCase("aabaabaa", "A", 0));
        assertEquals(2, AsciiString.indexOfIgnoreCase("aabaabaa", "B", 0));
        assertEquals(1, AsciiString.indexOfIgnoreCase("aabaabaa", "AB", 0));
        assertEquals(5, AsciiString.indexOfIgnoreCase("aabaabaa", "B", 3));
        assertEquals(-1, AsciiString.indexOfIgnoreCase("aabaabaa", "B", 9));
        assertEquals(2, AsciiString.indexOfIgnoreCase("aabaabaa", "B", -1));
        assertEquals(2, AsciiString.indexOfIgnoreCase("aabaabaa", "", 2));
        assertEquals(-1, AsciiString.indexOfIgnoreCase("abc", "", 9));
        assertEquals(0, AsciiString.indexOfIgnoreCase("ãabaabaa", "Ã", 0));
    }

    @Test
    public void testIndexOfIgnoreCaseAscii() {
        assertEquals(-1, AsciiString.indexOfIgnoreCaseAscii(null, "abc", 1));
        assertEquals(-1, AsciiString.indexOfIgnoreCaseAscii("abc", null, 1));
        assertEquals(0, AsciiString.indexOfIgnoreCaseAscii("", "", 0));
        assertEquals(0, AsciiString.indexOfIgnoreCaseAscii("aabaabaa", "A", 0));
        assertEquals(2, AsciiString.indexOfIgnoreCaseAscii("aabaabaa", "B", 0));
        assertEquals(1, AsciiString.indexOfIgnoreCaseAscii("aabaabaa", "AB", 0));
        assertEquals(5, AsciiString.indexOfIgnoreCaseAscii("aabaabaa", "B", 3));
        assertEquals(-1, AsciiString.indexOfIgnoreCaseAscii("aabaabaa", "B", 9));
        assertEquals(2, AsciiString.indexOfIgnoreCaseAscii("aabaabaa", "B", -1));
        assertEquals(2, AsciiString.indexOfIgnoreCaseAscii("aabaabaa", "", 2));
        assertEquals(-1, AsciiString.indexOfIgnoreCaseAscii("abc", "", 9));
    }

    @Test
    public void testTrim() {
        assertEquals("", AsciiString.EMPTY_STRING.trim().toString());
        assertEquals("abc", new AsciiString("  abc").trim().toString());
        assertEquals("abc", new AsciiString("abc  ").trim().toString());
        assertEquals("abc", new AsciiString("  abc  ").trim().toString());
    }

    @Test
    public void testIndexOfChar() {
        assertEquals(-1, AsciiString.indexOf(null, 'a', 0));
        assertEquals(-1, AsciiString.of("").indexOf('a', 0));
        assertEquals(-1, AsciiString.of("abc").indexOf('d', 0));
        assertEquals(-1, AsciiString.of("aabaabaa").indexOf('A', 0));
        assertEquals(0, AsciiString.of("aabaabaa").indexOf('a', 0));
        assertEquals(1, AsciiString.of("aabaabaa").indexOf('a', 1));
        assertEquals(3, AsciiString.of("aabaabaa").indexOf('a', 2));
        assertEquals(3, AsciiString.of("aabdabaa").indexOf('d', 1));
    }

    @Test
    public void testStaticIndexOfChar() {
        assertEquals(-1, AsciiString.indexOf(null, 'a', 0));
        assertEquals(-1, AsciiString.indexOf("", 'a', 0));
        assertEquals(-1, AsciiString.indexOf("abc", 'd', 0));
        assertEquals(-1, AsciiString.indexOf("aabaabaa", 'A', 0));
        assertEquals(0, AsciiString.indexOf("aabaabaa", 'a', 0));
        assertEquals(1, AsciiString.indexOf("aabaabaa", 'a', 1));
        assertEquals(3, AsciiString.indexOf("aabaabaa", 'a', 2));
        assertEquals(3, AsciiString.indexOf("aabdabaa", 'd', 1));
    }
}

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