/*
* 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 char array and implements CharSequence interface
*
*
* @author Lari Hotari
* @since 2.3.10
*
*/
class CharArrayCharSequence implements CharSequence, CharArrayAccessible {
private final char[] chars;
private final int count;
private final int start;
CharArrayCharSequence(char[] chars, int start, int count) {
if (start + count > chars.length)
throw new StringIndexOutOfBoundsException(start);
this.chars = chars;
this.start = start;
this.count = count;
}
public char charAt(int index) {
if ((index < 0) || (index + start >= chars.length))
throw new StringIndexOutOfBoundsException(index);
return chars[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 CharArrayCharSequence(chars, this.start + start, end - start);
}
@Override
public String toString() {
return new String(chars, start, count);
}
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");
System.arraycopy(chars, start + srcBegin, dst, dstBegin, srcEnd - srcBegin);
}
}