| /* |
| * $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); |
| } |
| |
| } |