/*
* $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/util/CharArrayBuffer.java $
* $Revision: 496070 $
* $Date: 2007-01-14 04:18:34 -0800 (Sun, 14 Jan 2007) $
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.http.util;
import org.apache.http.protocol.HTTP;
/**
* A resizable char array.
*
* @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
*
* @version $Revision: 496070 $
*
* @since 4.0
*/
public final class CharArrayBuffer {
private char[] buffer;
private int len;
public CharArrayBuffer(int capacity) {
super();
if (capacity < 0) {
throw new IllegalArgumentException("Buffer capacity may not be negative");
}
this.buffer = new char[capacity];
}
private void expand(int newlen) {
char newbuffer[] = new char[Math.max(this.buffer.length << 1, newlen)];
System.arraycopy(this.buffer, 0, newbuffer, 0, this.len);
this.buffer = newbuffer;
}
public void append(final char[] b, int off, int len) {
if (b == null) {
return;
}
if ((off < 0) || (off > b.length) || (len < 0) ||
((off + len) < 0) || ((off + len) > b.length)) {
throw new IndexOutOfBoundsException();
}
if (len == 0) {
return;
}
int newlen = this.len + len;
if (newlen > this.buffer.length) {
expand(newlen);
}
System.arraycopy(b, off, this.buffer, this.len, len);
this.len = newlen;
}
public void append(String str) {
if (str == null) {
str = "null";
}
int strlen = str.length();
int newlen = this.len + strlen;
if (newlen > this.buffer.length) {
expand(newlen);
}
str.getChars(0, strlen, this.buffer, this.len);
this.len = newlen;
}
public void append(final CharArrayBuffer b, int off, int len) {
if (b == null) {
return;
}
append(b.buffer, off, len);
}
public void append(final CharArrayBuffer b) {
if (b == null) {
return;
}
append(b.buffer,0, b.len);
}
public void append(char ch) {
int newlen = this.len + 1;
if (newlen > this.buffer.length) {
expand(newlen);
}
this.buffer[this.len] = ch;
this.len = newlen;
}
public void append(final byte[] b, int off, int len) {
if (b == null) {
return;
}
if ((off < 0) || (off > b.length) || (len < 0) ||
((off + len) < 0) || ((off + len) > b.length)) {
throw new IndexOutOfBoundsException();
}
if (len == 0) {
return;
}
int oldlen = this.len;
int newlen = oldlen + len;
if (newlen > this.buffer.length) {
expand(newlen);
}
for (int i1 = off, i2 = oldlen; i2 < newlen; i1++, i2++) {
int ch = b[i1];
if (ch < 0) {
ch = 256 + ch;
}
this.buffer[i2] = (char) ch;
}
this.len = newlen;
}
public void append(final ByteArrayBuffer b, int off, int len) {
if (b == null) {
return;
}
append(b.buffer(), off, len);
}
public void append(final Object obj) {
append(String.valueOf(obj));
}
public void clear() {
this.len = 0;
}
public char[] toCharArray() {
char[] b = new char[this.len];
if (this.len > 0) {
System.arraycopy(this.buffer, 0, b, 0, this.len);
}
return b;
}
public char charAt(int i) {
return this.buffer[i];
}
public char[] buffer() {
return this.buffer;
}
public int capacity() {
return this.buffer.length;
}
public int length() {
return this.len;
}
public void ensureCapacity(int required) {
int available = this.buffer.length - this.len;
if (required > available) {
expand(this.len + required);
}
}
public void setLength(int len) {
if (len < 0 || len > this.buffer.length) {
throw new IndexOutOfBoundsException();
}
this.len = len;
}
public boolean isEmpty() {
return this.len == 0;
}
public boolean isFull() {
return this.len == this.buffer.length;
}
public int indexOf(int ch, int beginIndex, int endIndex) {
if (beginIndex < 0) {
beginIndex = 0;
}
if (endIndex > this.len) {
endIndex = this.len;
}
if (beginIndex > endIndex) {
return -1;
}
for (int i = beginIndex; i < endIndex; i++) {
if (this.buffer[i] == ch) {
return i;
}
}
return -1;
}
public int indexOf(int ch) {
return indexOf(ch, 0, this.len);
}
public String substring(int beginIndex, int endIndex) {
if (beginIndex < 0) {
throw new IndexOutOfBoundsException();
}
if (endIndex > this.len) {
throw new IndexOutOfBoundsException();
}
if (beginIndex > endIndex) {
throw new IndexOutOfBoundsException();
}
return new String(this.buffer, beginIndex, endIndex - beginIndex);
}
public String substringTrimmed(int beginIndex, int endIndex) {
if (beginIndex < 0) {
throw new IndexOutOfBoundsException();
}
if (endIndex > this.len) {
throw new IndexOutOfBoundsException();
}
if (beginIndex > endIndex) {
throw new IndexOutOfBoundsException();
}
while (beginIndex < endIndex && HTTP.isWhitespace(this.buffer[beginIndex])) {
beginIndex++;
}
while (endIndex > beginIndex && HTTP.isWhitespace(this.buffer[endIndex - 1])) {
endIndex--;
}
return new String(this.buffer, beginIndex, endIndex - beginIndex);
}
public String toString() {
return new String(this.buffer, 0, this.len);
}
}