Android example source code file (StaticLayoutBidiTest.java)

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

Java - Android tags/keywords

alef, android, bet, bidi, dalet, gimel, req_dl, req_dr, req_l, req_r, sp, staticlayoutbiditest, string, stringbuilder, test, testcase, util, utilities, utils

The StaticLayoutBidiTest.java Android example source code

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed 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 android.text;

import android.test.suitebuilder.annotation.SmallTest;
import android.util.Log;

import junit.framework.TestCase;

/**
 * Tests StaticLayout bidi implementation.
 */
public class StaticLayoutBidiTest extends TestCase {
    
    public static final int REQ_DL = 2; // Layout.DIR_REQUEST_DEFAULT_LTR;
    public static final int REQ_DR = -2; // Layout.DIR_REQUEST_DEFAULT_RTL;
    public static final int REQ_L = 1; // Layout.DIR_REQUEST_LTR;
    public static final int REQ_R = -1; // Layout.DIR_REQUEST_RTL;
    public static final int L = Layout.DIR_LEFT_TO_RIGHT;
    public static final int R = Layout.DIR_RIGHT_TO_LEFT;
    
    public static final String SP = " ";
    public static final String ALEF = "\u05d0";
    public static final String BET = "\u05d1";
    public static final String GIMEL = "\u05d2";
    public static final String DALET = "\u05d3";
    
    //@SmallTest
    public void testAllLtr() {
        expectBidi(REQ_DL, "a test", "000000", L);
    }
    
    //@SmallTest
    public void testLtrRtl() {
        expectBidi(REQ_DL, "abc " + ALEF + BET + GIMEL, "0000111", L);
    }
    
    //@SmallTest
    public void testAllRtl() {
        expectBidi(REQ_DL, ALEF + SP + ALEF + BET + GIMEL + DALET, "111111", R);
    }
    
    //@SmallTest
    public void testRtlLtr() {
        expectBidi(REQ_DL,  ALEF + BET + GIMEL + " abc", "1111000", R);
    }
    
    //@SmallTest
    public void testRAllLtr() {
        expectBidi(REQ_R, "a test", "000000", R);
    }
    
    //@SmallTest
    public void testRLtrRtl() {
        expectBidi(REQ_R, "abc " + ALEF + BET + GIMEL, "0001111", R);
    }
    
    //@SmallTest
    public void testLAllRtl() {
        expectBidi(REQ_L, ALEF + SP + ALEF + BET + GIMEL + DALET, "111111", L);
    }
    
    //@SmallTest
    public void testLRtlLtr() {
        expectBidi(REQ_L,  ALEF + BET + GIMEL + " abc", "1110000", L);
    }
    
    private void expectBidi(int dir, String text, 
            String expectedLevels, int expectedDir) {
        char[] chs = text.toCharArray();
        int n = chs.length;
        byte[] chInfo = new byte[n];
        
        int resultDir = StaticLayout.bidi(dir, chs, chInfo, n, false);
        
        {
            StringBuilder sb = new StringBuilder("info:");
            for (int i = 0; i < n; ++i) {
                sb.append(" ").append(String.valueOf(chInfo[i]));
            }
            Log.i("BIDI", sb.toString());
        }
        
        char[] resultLevelChars = new char[n];
        for (int i = 0; i < n; ++i) {
            resultLevelChars[i] = (char)('0' + chInfo[i]);
        }
        String resultLevels = new String(resultLevelChars);
        assertEquals("direction", expectedDir, resultDir);
        assertEquals("levels", expectedLevels, resultLevels);
    }
    
    //@SmallTest
    public void testNativeBidi() {
        // native bidi returns levels, not simply directions
        expectNativeBidi(REQ_DL,  ALEF + BET + GIMEL + " abc", "1111222", R);
    }
    
    private void expectNativeBidi(int dir, String text, 
            String expectedLevels, int expectedDir) {
        char[] chs = text.toCharArray();
        int n = chs.length;
        byte[] chInfo = new byte[n];
        
        int resultDir = AndroidBidi.bidi(dir, chs, chInfo, n, false);
        
        {
            StringBuilder sb = new StringBuilder("info:");
            for (int i = 0; i < n; ++i) {
                sb.append(" ").append(String.valueOf(chInfo[i]));
            }
            Log.i("BIDI", sb.toString());
        }
        
        char[] resultLevelChars = new char[n];
        for (int i = 0; i < n; ++i) {
            resultLevelChars[i] = (char)('0' + chInfo[i]);
        }
        String resultLevels = new String(resultLevelChars);
        assertEquals("direction", expectedDir, resultDir);
        assertEquals("levels", expectedLevels, resultLevels);
    }
}