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/*
* Copyright (C) 2016 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.annotation.NonNull;
import java.text.CharacterIterator;
/**
* An implementation of {@link java.text.CharacterIterator} that iterates over a given CharSequence.
* {@hide}
*/
public class CharSequenceCharacterIterator implements CharacterIterator {
private final int mBeginIndex, mEndIndex;
private int mIndex;
private final CharSequence mCharSeq;
/**
* Constructs the iterator given a CharSequence and a range. The position of the iterator index
* is set to the beginning of the range.
*/
public CharSequenceCharacterIterator(@NonNull CharSequence text, int start, int end) {
mCharSeq = text;
mBeginIndex = mIndex = start;
mEndIndex = end;
}
public char first() {
mIndex = mBeginIndex;
return current();
}
public char last() {
if (mBeginIndex == mEndIndex) {
mIndex = mEndIndex;
return DONE;
} else {
mIndex = mEndIndex - 1;
return mCharSeq.charAt(mIndex);
}
}
public char current() {
return (mIndex == mEndIndex) ? DONE : mCharSeq.charAt(mIndex);
}
public char next() {
mIndex++;
if (mIndex >= mEndIndex) {
mIndex = mEndIndex;
return DONE;
} else {
return mCharSeq.charAt(mIndex);
}
}
public char previous() {
if (mIndex <= mBeginIndex) {
return DONE;
} else {
mIndex--;
return mCharSeq.charAt(mIndex);
}
}
public char setIndex(int position) {
if (mBeginIndex <= position && position <= mEndIndex) {
mIndex = position;
return current();
} else {
throw new IllegalArgumentException("invalid position");
}
}
public int getBeginIndex() {
return mBeginIndex;
}
public int getEndIndex() {
return mEndIndex;
}
public int getIndex() {
return mIndex;
}
public Object clone() {
try {
return super.clone();
} catch (CloneNotSupportedException e) {
throw new InternalError();
}
}
}
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