Source Code Cross Referenced for XMLString.java in  » 6.0-JDK-Modules » sjsxp » com » sun » xml » stream » xerces » xni » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » sjsxp » com.sun.xml.stream.xerces.xni 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * The Apache Software License, Version 1.1
003:         *
004:         *
005:         * Copyright (c) 2000-2002 The Apache Software Foundation.  All rights 
006:         * reserved.
007:         *
008:         * Redistribution and use in source and binary forms, with or without
009:         * modification, are permitted provided that the following conditions
010:         * are met:
011:         *
012:         * 1. Redistributions of source code must retain the above copyright
013:         *    notice, this list of conditions and the following disclaimer. 
014:         *
015:         * 2. Redistributions in binary form must reproduce the above copyright
016:         *    notice, this list of conditions and the following disclaimer in
017:         *    the documentation and/or other materials provided with the
018:         *    distribution.
019:         *
020:         * 3. The end-user documentation included with the redistribution,
021:         *    if any, must include the following acknowledgment:  
022:         *       "This product includes software developed by the
023:         *        Apache Software Foundation (http://www.apache.org/)."
024:         *    Alternately, this acknowledgment may appear in the software itself,
025:         *    if and wherever such third-party acknowledgments normally appear.
026:         *
027:         * 4. The names "Xerces" and "Apache Software Foundation" must
028:         *    not be used to endorse or promote products derived from this
029:         *    software without prior written permission. For written 
030:         *    permission, please contact apache@apache.org.
031:         *
032:         * 5. Products derived from this software may not be called "Apache",
033:         *    nor may "Apache" appear in their name, without prior written
034:         *    permission of the Apache Software Foundation.
035:         *
036:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
037:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
038:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
039:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
040:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
041:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
042:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
043:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
044:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
045:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
046:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
047:         * SUCH DAMAGE.
048:         * ====================================================================
049:         *
050:         * This software consists of voluntary contributions made by many
051:         * individuals on behalf of the Apache Software Foundation and was
052:         * originally based on software copyright (c) 1999, International
053:         * Business Machines, Inc., http://www.apache.org.  For more
054:         * information on the Apache Software Foundation, please see
055:         * <http://www.apache.org/>.
056:         */
057:
058:        package com.sun.xml.stream.xerces.xni;
059:
060:        /**
061:         * This class is used as a structure to pass text contained in the underlying
062:         * character buffer of the scanner. The offset and length fields allow the
063:         * buffer to be re-used without creating new character arrays.
064:         * <p>
065:         * <strong>Note:</strong> Methods that are passed an XMLString structure
066:         * should consider the contents read-only and not make any modifications
067:         * to the contents of the buffer. The method receiving this structure
068:         * should also not modify the offset and length if this structure (or
069:         * the values of this structure) are passed to another method.
070:         * <p>
071:         * <strong>Note:</strong> Methods that are passed an XMLString structure
072:         * are required to copy the information out of the buffer if it is to be
073:         * saved for use beyond the scope of the method. The contents of the 
074:         * structure are volatile and the contents of the character buffer cannot
075:         * be assured once the method that is passed this structure returns.
076:         * Therefore, methods passed this structure should not save any reference
077:         * to the structure or the character array contained in the structure.
078:         *
079:         * @author Eric Ye, IBM
080:         * @author Andy Clark, IBM
081:         *
082:         * @version $Id: XMLString.java,v 1.2 2006/04/01 06:01:45 jeffsuttor Exp $
083:         */
084:        public class XMLString {
085:
086:            //
087:            // Data
088:            //
089:
090:            /** The character array. */
091:            public char[] ch;
092:
093:            /** The offset into the character array. */
094:            public int offset;
095:
096:            /** The length of characters from the offset. */
097:            public int length;
098:
099:            //
100:            // Constructors
101:            //
102:
103:            /** Default constructor. */
104:            public XMLString() {
105:            } // <init>()
106:
107:            /**
108:             * Constructs an XMLString structure preset with the specified
109:             * values.
110:             * 
111:             * @param ch     The character array.
112:             * @param offset The offset into the character array.
113:             * @param length The length of characters from the offset.
114:             */
115:            public XMLString(char[] ch, int offset, int length) {
116:                setValues(ch, offset, length);
117:            } // <init>(char[],int,int)
118:
119:            /**
120:             * Constructs an XMLString structure with copies of the values in
121:             * the given structure.
122:             * <p>
123:             * <strong>Note:</strong> This does not copy the character array;
124:             * only the reference to the array is copied.
125:             *
126:             * @param string The XMLString to copy.
127:             */
128:            public XMLString(XMLString string) {
129:                setValues(string);
130:            } // <init>(XMLString)
131:
132:            //
133:            // Public methods
134:            //
135:
136:            /**
137:             * Initializes the contents of the XMLString structure with the
138:             * specified values.
139:             * 
140:             * @param ch     The character array.
141:             * @param offset The offset into the character array.
142:             * @param length The length of characters from the offset.
143:             */
144:            public void setValues(char[] ch, int offset, int length) {
145:                this .ch = ch;
146:                this .offset = offset;
147:                this .length = length;
148:            } // setValues(char[],int,int)
149:
150:            /**
151:             * Initializes the contents of the XMLString structure with copies
152:             * of the given string structure.
153:             * <p>
154:             * <strong>Note:</strong> This does not copy the character array;
155:             * only the reference to the array is copied.
156:             * 
157:             * @param s
158:             */
159:            public void setValues(XMLString s) {
160:                setValues(s.ch, s.offset, s.length);
161:            } // setValues(XMLString)
162:
163:            /** Resets all of the values to their defaults. */
164:            public void clear() {
165:                this .ch = null;
166:                this .offset = 0;
167:                this .length = -1;
168:            } // clear()
169:
170:            /**
171:             * Returns true if the contents of this XMLString structure and
172:             * the specified array are equal.
173:             * 
174:             * @param ch     The character array.
175:             * @param offset The offset into the character array.
176:             * @param length The length of characters from the offset.
177:             */
178:            public boolean equals(char[] ch, int offset, int length) {
179:                if (ch == null) {
180:                    return false;
181:                }
182:                if (this .length != length) {
183:                    return false;
184:                }
185:
186:                for (int i = 0; i < length; i++) {
187:                    if (this .ch[this .offset + i] != ch[offset + i]) {
188:                        return false;
189:                    }
190:                }
191:                return true;
192:            } // equals(char[],int,int):boolean
193:
194:            /**
195:             * Returns true if the contents of this XMLString structure and
196:             * the specified string are equal.
197:             * 
198:             * @param s The string to compare.
199:             */
200:            public boolean equals(String s) {
201:                if (s == null) {
202:                    return false;
203:                }
204:                if (length != s.length()) {
205:                    return false;
206:                }
207:
208:                // is this faster than call s.toCharArray first and compare the 
209:                // two arrays directly, which will possibly involve creating a
210:                // new char array object.
211:                for (int i = 0; i < length; i++) {
212:                    if (ch[offset + i] != s.charAt(i)) {
213:                        return false;
214:                    }
215:                }
216:
217:                return true;
218:            } // equals(String):boolean
219:
220:            //
221:            // Object methods
222:            //
223:
224:            /** Returns a string representation of this object. */
225:            public String toString() {
226:                return length > 0 ? new String(ch, offset, length) : "";
227:            } // toString():String
228:
229:        } // class XMLString
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