org.mariotaku.twidere.util.CodePointArray.java Source code

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Here is the source code for org.mariotaku.twidere.util.CodePointArray.java

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/*
 *                 Twidere - Twitter client for Android
 *
 *  Copyright (C) 2012-2015 Mariotaku Lee <mariotaku.lee@gmail.com>
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.mariotaku.twidere.util;

import android.support.annotation.NonNull;

import org.apache.commons.lang3.ArrayUtils;

/**
 * Created by mariotaku on 15/11/4.
 */
public final class CodePointArray {

    private final int[] codePoints;
    private final int length;

    CodePointArray(int[] codePoints, int length) {
        this.codePoints = codePoints;
        this.length = length;
    }

    public CodePointArray(@NonNull final CharSequence cs) {
        final int inputLength = cs.length();
        codePoints = new int[inputLength];
        int codePointsLength = 0;
        for (int offset = 0; offset < inputLength;) {
            final int codePoint = Character.codePointAt(cs, offset);
            codePoints[codePointsLength++] = codePoint;
            offset += Character.charCount(codePoint);
        }
        this.length = codePointsLength;
    }

    public int get(int pos) {
        return codePoints[pos];
    }

    public int length() {
        return length;
    }

    public int indexOfText(int codePoint, int start) {
        int index = 0;
        for (int i = 0; i < length; i++) {
            final int current = codePoints[i];
            if (current == codePoint && i >= start)
                return index;
            index += Character.charCount(current);
        }
        return -1;
    }

    @NonNull
    public String substring(int start, int end) {
        final StringBuilder sb = new StringBuilder();
        for (int i = start; i < end; i++) {
            sb.appendCodePoint(codePoints[i]);
        }
        return sb.toString();
    }

    @NonNull
    public CodePointArray subCodePointArray(int start, int end) {
        return new CodePointArray(ArrayUtils.subarray(codePoints, start, end), end - start);
    }

    public int[] subarray(int start, int end) {
        return ArrayUtils.subarray(codePoints, start, end);
    }

    @Override
    public String toString() {
        return substring(0, length);
    }

    public int charCount(int start, int end) {
        int count = 0;
        for (int i = start; i < end; i++) {
            count += Character.charCount(codePoints[i]);
        }
        return count;
    }
}