Source Code Cross Referenced for CharArrayBuffer.java in  » Net » httpcomponents-core-4.0-beta1 » org » apache » http » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » httpcomponents core 4.0 beta1 » org.apache.http.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $HeadURL: https://svn.apache.org/repos/asf/httpcomponents/httpcore/tags/4.0-beta1/module-main/src/main/java/org/apache/http/util/CharArrayBuffer.java $
003:         * $Revision: 496070 $
004:         * $Date: 2007-01-14 13:18:34 +0100 (Sun, 14 Jan 2007) $
005:         *
006:         * ====================================================================
007:         * Licensed to the Apache Software Foundation (ASF) under one
008:         * or more contributor license agreements.  See the NOTICE file
009:         * distributed with this work for additional information
010:         * regarding copyright ownership.  The ASF licenses this file
011:         * to you under the Apache License, Version 2.0 (the
012:         * "License"); you may not use this file except in compliance
013:         * with the License.  You may obtain a copy of the License at
014:         *
015:         *   http://www.apache.org/licenses/LICENSE-2.0
016:         *
017:         * Unless required by applicable law or agreed to in writing,
018:         * software distributed under the License is distributed on an
019:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
020:         * KIND, either express or implied.  See the License for the
021:         * specific language governing permissions and limitations
022:         * under the License.
023:         * ====================================================================
024:         *
025:         * This software consists of voluntary contributions made by many
026:         * individuals on behalf of the Apache Software Foundation.  For more
027:         * information on the Apache Software Foundation, please see
028:         * <http://www.apache.org/>.
029:         *
030:         */
031:
032:        package org.apache.http.util;
033:
034:        import org.apache.http.protocol.HTTP;
035:
036:        /**
037:         * A resizable char array.
038:         *
039:         * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
040:         * 
041:         * @version $Revision: 496070 $
042:         * 
043:         * @since 4.0
044:         */
045:        public final class CharArrayBuffer {
046:
047:            private char[] buffer;
048:            private int len;
049:
050:            public CharArrayBuffer(int capacity) {
051:                super ();
052:                if (capacity < 0) {
053:                    throw new IllegalArgumentException(
054:                            "Buffer capacity may not be negative");
055:                }
056:                this .buffer = new char[capacity];
057:            }
058:
059:            private void expand(int newlen) {
060:                char newbuffer[] = new char[Math.max(this .buffer.length << 1,
061:                        newlen)];
062:                System.arraycopy(this .buffer, 0, newbuffer, 0, this .len);
063:                this .buffer = newbuffer;
064:            }
065:
066:            public void append(final char[] b, int off, int len) {
067:                if (b == null) {
068:                    return;
069:                }
070:                if ((off < 0) || (off > b.length) || (len < 0)
071:                        || ((off + len) < 0) || ((off + len) > b.length)) {
072:                    throw new IndexOutOfBoundsException();
073:                }
074:                if (len == 0) {
075:                    return;
076:                }
077:                int newlen = this .len + len;
078:                if (newlen > this .buffer.length) {
079:                    expand(newlen);
080:                }
081:                System.arraycopy(b, off, this .buffer, this .len, len);
082:                this .len = newlen;
083:            }
084:
085:            public void append(String str) {
086:                if (str == null) {
087:                    str = "null";
088:                }
089:                int strlen = str.length();
090:                int newlen = this .len + strlen;
091:                if (newlen > this .buffer.length) {
092:                    expand(newlen);
093:                }
094:                str.getChars(0, strlen, this .buffer, this .len);
095:                this .len = newlen;
096:            }
097:
098:            public void append(final CharArrayBuffer b, int off, int len) {
099:                if (b == null) {
100:                    return;
101:                }
102:                append(b.buffer, off, len);
103:            }
104:
105:            public void append(final CharArrayBuffer b) {
106:                if (b == null) {
107:                    return;
108:                }
109:                append(b.buffer, 0, b.len);
110:            }
111:
112:            public void append(char ch) {
113:                int newlen = this .len + 1;
114:                if (newlen > this .buffer.length) {
115:                    expand(newlen);
116:                }
117:                this .buffer[this .len] = ch;
118:                this .len = newlen;
119:            }
120:
121:            public void append(final byte[] b, int off, int len) {
122:                if (b == null) {
123:                    return;
124:                }
125:                if ((off < 0) || (off > b.length) || (len < 0)
126:                        || ((off + len) < 0) || ((off + len) > b.length)) {
127:                    throw new IndexOutOfBoundsException();
128:                }
129:                if (len == 0) {
130:                    return;
131:                }
132:                int oldlen = this .len;
133:                int newlen = oldlen + len;
134:                if (newlen > this .buffer.length) {
135:                    expand(newlen);
136:                }
137:                for (int i1 = off, i2 = oldlen; i2 < newlen; i1++, i2++) {
138:                    int ch = b[i1];
139:                    if (ch < 0) {
140:                        ch = 256 + ch;
141:                    }
142:                    this .buffer[i2] = (char) ch;
143:                }
144:                this .len = newlen;
145:            }
146:
147:            public void append(final ByteArrayBuffer b, int off, int len) {
148:                if (b == null) {
149:                    return;
150:                }
151:                append(b.buffer(), off, len);
152:            }
153:
154:            public void append(final Object obj) {
155:                append(String.valueOf(obj));
156:            }
157:
158:            public void clear() {
159:                this .len = 0;
160:            }
161:
162:            public char[] toCharArray() {
163:                char[] b = new char[this .len];
164:                if (this .len > 0) {
165:                    System.arraycopy(this .buffer, 0, b, 0, this .len);
166:                }
167:                return b;
168:            }
169:
170:            public char charAt(int i) {
171:                return this .buffer[i];
172:            }
173:
174:            public char[] buffer() {
175:                return this .buffer;
176:            }
177:
178:            public int capacity() {
179:                return this .buffer.length;
180:            }
181:
182:            public int length() {
183:                return this .len;
184:            }
185:
186:            public void ensureCapacity(int required) {
187:                int available = this .buffer.length - this .len;
188:                if (required > available) {
189:                    expand(this .len + required);
190:                }
191:            }
192:
193:            public void setLength(int len) {
194:                if (len < 0 || len > this .buffer.length) {
195:                    throw new IndexOutOfBoundsException();
196:                }
197:                this .len = len;
198:            }
199:
200:            public boolean isEmpty() {
201:                return this .len == 0;
202:            }
203:
204:            public boolean isFull() {
205:                return this .len == this .buffer.length;
206:            }
207:
208:            public int indexOf(int ch, int beginIndex, int endIndex) {
209:                if (beginIndex < 0) {
210:                    beginIndex = 0;
211:                }
212:                if (endIndex > this .len) {
213:                    endIndex = this .len;
214:                }
215:                if (beginIndex > endIndex) {
216:                    return -1;
217:                }
218:                for (int i = beginIndex; i < endIndex; i++) {
219:                    if (this .buffer[i] == ch) {
220:                        return i;
221:                    }
222:                }
223:                return -1;
224:            }
225:
226:            public int indexOf(int ch) {
227:                return indexOf(ch, 0, this .len);
228:            }
229:
230:            public String substring(int beginIndex, int endIndex) {
231:                if (beginIndex < 0) {
232:                    throw new IndexOutOfBoundsException();
233:                }
234:                if (endIndex > this .len) {
235:                    throw new IndexOutOfBoundsException();
236:                }
237:                if (beginIndex > endIndex) {
238:                    throw new IndexOutOfBoundsException();
239:                }
240:                return new String(this .buffer, beginIndex, endIndex
241:                        - beginIndex);
242:            }
243:
244:            public String substringTrimmed(int beginIndex, int endIndex) {
245:                if (beginIndex < 0) {
246:                    throw new IndexOutOfBoundsException();
247:                }
248:                if (endIndex > this .len) {
249:                    throw new IndexOutOfBoundsException();
250:                }
251:                if (beginIndex > endIndex) {
252:                    throw new IndexOutOfBoundsException();
253:                }
254:                while (beginIndex < endIndex
255:                        && HTTP.isWhitespace(this .buffer[beginIndex])) {
256:                    beginIndex++;
257:                }
258:                while (endIndex > beginIndex
259:                        && HTTP.isWhitespace(this .buffer[endIndex - 1])) {
260:                    endIndex--;
261:                }
262:                return new String(this .buffer, beginIndex, endIndex
263:                        - beginIndex);
264:            }
265:
266:            public String toString() {
267:                return new String(this .buffer, 0, this.len);
268:            }
269:
270:        }
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