/*
* Copyright 2000-2016 JetBrains s.r.o.
*
* 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 com.intellij.util.text;
import org.jetbrains.annotations.NotNull;
public class SingleCharSequence implements CharSequence {
private final char myCh;
public SingleCharSequence(char ch) {
myCh = ch;
}
@Override
public int length() {
return 1;
}
@Override
public char charAt(int index) {
if (index != 0) {
throw new IndexOutOfBoundsException("Index out of bounds: " + index);
}
return myCh;
}
@Override
public CharSequence subSequence(int start, int end) {
if (start == 0 && end == 1) return this;
if (start < 0) throw new IndexOutOfBoundsException("Start index out of range:" + start);
if (end > 1 || end < 0) throw new IndexOutOfBoundsException("End index out of range:" + end);
if (start > end) throw new IndexOutOfBoundsException("Start index should be less or equal to end index:" + start + " - " + end);
return "";
}
@Override
@NotNull
public String toString() {
return String.valueOf(myCh);
}
}