Copies the codepoints in a CharSequence to an int array - Android java.lang

Android examples for java.lang:String

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Description

Copies the codepoints in a CharSequence to an int array

Demo Code

/*/*from  www  . j  a  v  a  2  s  .  co  m*/
 * Copyright (C) 2012 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.
 */
 
import android.text.TextUtils;
import java.util.Arrays;

public class Main{

    /**
     * Copies the codepoints in a CharSequence to an int array.
     *
     * This method assumes there is enough space in the array to store the code points. The size
     * can be measured with Character#codePointCount(CharSequence, int, int) before passing to this
     * method. If the int array is too small, an ArrayIndexOutOfBoundsException will be thrown.
     * Also, this method makes no effort to be thread-safe. Do not modify the CharSequence while
     * this method is running, or the behavior is undefined.
     * This method can optionally downcase code points before copying them, but it pays no attention
     * to locale while doing so.
     *
     * @param destination the int array.
     * @param charSequence the CharSequence.
     * @param startIndex the start index inside the string in java chars, inclusive.
     * @param endIndex the end index inside the string in java chars, exclusive.
     * @param downCase if this is true, code points will be downcased before being copied.
     * @return the number of copied code points.
     */
    public static int copyCodePointsAndReturnCodePointCount(
            final int[] destination, final CharSequence charSequence,
            final int startIndex, final int endIndex, final boolean downCase) {
        int destIndex = 0;
        for (int index = startIndex; index < endIndex; index = Character
                .offsetByCodePoints(charSequence, index, 1)) {
            final int codePoint = Character
                    .codePointAt(charSequence, index);
            // TODO: stop using this, as it's not aware of the locale and does not always do
            // the right thing.
            destination[destIndex] = downCase ? Character
                    .toLowerCase(codePoint) : codePoint;
            destIndex++;
        }
        return destIndex;
    }

}

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