/*
* Copyright 2014 the original author or authors.
*
* 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 org.grails.charsequences;
/**
* Wraps a part of a String and implements the CharSequence interface
*
*
* @author Lari Hotari
* @since 2.3.10
*
*/
class SubCharSequence implements CharSequence, CharArrayAccessible {
private final CharSequence str;
private final int count;
private final int start;
SubCharSequence(CharSequence str, int start, int count) {
if (start + count > str.length())
throw new StringIndexOutOfBoundsException(start);
this.str = str;
this.start = start;
this.count = count;
}
public char charAt(int index) {
if ((index < 0) || (index + start >= str.length()))
throw new StringIndexOutOfBoundsException(index);
return str.charAt(index + start);
}
public int length() {
return count;
}
public CharSequence subSequence(int start, int end) {
if (start < 0)
throw new StringIndexOutOfBoundsException(start);
if (end > count)
throw new StringIndexOutOfBoundsException(end);
if (start > end)
throw new StringIndexOutOfBoundsException(end - start);
if (start == 0 && end == count) {
return this;
}
return new SubCharSequence(str, this.start + start, end - start);
}
@Override
public String toString() {
return str.subSequence(start, start + count).toString();
}
public void getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin) {
if (srcBegin < 0)
throw new StringIndexOutOfBoundsException(srcBegin);
if ((srcEnd < 0) || (srcEnd > start+count))
throw new StringIndexOutOfBoundsException(srcEnd);
if (srcBegin > srcEnd)
throw new StringIndexOutOfBoundsException("srcBegin > srcEnd");
CharSequences.getChars(str, start + srcBegin, start + srcEnd, dst, dstBegin);
}
}