| /* |
| * Copyright (C) 2011 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.util.MathUtils; |
| |
| import java.text.CharacterIterator; |
| |
| /** {@hide} */ |
| public class CharSequenceIterator implements CharacterIterator { |
| private final CharSequence mValue; |
| |
| private final int mStart; |
| private final int mEnd; |
| private int mIndex; |
| |
| public CharSequenceIterator(CharSequence value) { |
| mValue = value; |
| mStart = 0; |
| mEnd = value.length(); |
| mIndex = 0; |
| } |
| |
| @Override |
| public Object clone() { |
| try { |
| return super.clone(); |
| } catch (CloneNotSupportedException e) { |
| throw new AssertionError(e); |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| public char current() { |
| if (mIndex == mEnd) { |
| return DONE; |
| } |
| return mValue.charAt(mIndex); |
| } |
| |
| /** {@inheritDoc} */ |
| public int getBeginIndex() { |
| return mStart; |
| } |
| |
| /** {@inheritDoc} */ |
| public int getEndIndex() { |
| return mEnd; |
| } |
| |
| /** {@inheritDoc} */ |
| public int getIndex() { |
| return mIndex; |
| } |
| |
| /** {@inheritDoc} */ |
| public char first() { |
| return setIndex(mStart); |
| } |
| |
| /** {@inheritDoc} */ |
| public char last() { |
| return setIndex(mEnd - 1); |
| } |
| |
| /** {@inheritDoc} */ |
| public char next() { |
| return setIndex(mIndex + 1); |
| } |
| |
| /** {@inheritDoc} */ |
| public char previous() { |
| return setIndex(mIndex - 1); |
| } |
| |
| /** {@inheritDoc} */ |
| public char setIndex(int index) { |
| mIndex = MathUtils.constrain(index, mStart, mEnd); |
| return current(); |
| } |
| } |