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// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
package jodd.util;
/**
* Simple {@code CharSequence} wrapper of the char array.
*/
public class CharArraySequence implements CharSequence {
public static final CharSequence EMPTY = CharArraySequence.of();
private final char[] buffer;
private final int off, len;
/**
* Static constructor that creates a char sequence using provided char array.
*/
public static CharArraySequence of(final char... value) {
return new CharArraySequence(value);
}
public static CharArraySequence of(final char[] value, final int offset, final int len) {
return new CharArraySequence(value, offset, len);
}
/**
* Static constructor that creates a char sequence by making a copy of provided char array.
*/
public static CharArraySequence from(final char[] value, final int offset, final int len) {
final char[] buffer = new char[value.length];
System.arraycopy(value, offset, buffer, 0, len);
return new CharArraySequence(buffer);
}
public CharArraySequence(final char[] value) {
buffer = value;
off = 0;
len = value.length;
}
public CharArraySequence(final char[] value, final int offset, final int length) {
if ((offset | length | offset + length | value.length - offset - length) < 0) {
throw new IndexOutOfBoundsException();
}
buffer = value;
off = offset;
len = length;
}
/**
* Ctor without the bounds check.
*/
private CharArraySequence(final int offset, final int length, final char[] value) {
off = offset;
len = length;
buffer = value;
}
@Override
public int length() { return len; }
@Override
public String toString() { return String.valueOf(buffer, off, len); }
@Override
public char charAt(final int index) {
//if ((index | len - index - 1) < 0) {
if (index < 0) {
throw new IndexOutOfBoundsException();
}
return buffer[off + index];
}
@Override
public CharSequence subSequence(final int start, final int end) {
final int count = end - start;
final int rem = len - end;
if ((start | end | count | rem) < 0) {
throw new IndexOutOfBoundsException();
}
if ((start | rem) == 0) {
return this;
}
return new CharArraySequence(off + start, count, buffer);
}
}
