[2674] | 1 | /* |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one or more |
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| 3 | * contributor license agreements. See the NOTICE file distributed with |
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| 4 | * this work for additional information regarding copyright ownership. |
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| 5 | * The ASF licenses this file to You under the Apache License, Version 2.0 |
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| 6 | * (the "License"); you may not use this file except in compliance with |
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| 7 | * the License. You may obtain a copy of the License at |
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| 8 | * |
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| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 10 | * |
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| 11 | * Unless required by applicable law or agreed to in writing, software |
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| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 14 | * See the License for the specific language governing permissions and |
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| 15 | * limitations under the License. |
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| 16 | */ |
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| 17 | |
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| 18 | /* |
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| 19 | * $Id: ContentHandler.hpp 568078 2007-08-21 11:43:25Z amassari $ |
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| 20 | */ |
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| 21 | |
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| 22 | |
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| 23 | #ifndef CONTENTHANDLER_HPP |
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| 24 | #define CONTENTHANDLER_HPP |
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| 25 | |
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| 26 | #include <xercesc/util/XercesDefs.hpp> |
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| 27 | |
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| 28 | XERCES_CPP_NAMESPACE_BEGIN |
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| 29 | |
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| 30 | class Attributes; |
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| 31 | class Locator; |
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| 32 | |
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| 33 | /** |
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| 34 | * Receive notification of general document events. |
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| 35 | * |
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| 36 | * <p>This is the main interface that most SAX2 applications |
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| 37 | * implement: if the application needs to be informed of basic parsing |
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| 38 | * events, it implements this interface and registers an instance with |
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| 39 | * the SAX2 parser using the setDocumentHandler method. The parser |
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| 40 | * uses the instance to report basic document-related events like |
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| 41 | * the start and end of elements and character data.</p> |
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| 42 | * |
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| 43 | * <p>The order of events in this interface is very important, and |
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| 44 | * mirrors the order of information in the document itself. For |
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| 45 | * example, all of an element's content (character data, processing |
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| 46 | * instructions, and/or subelements) will appear, in order, between |
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| 47 | * the startElement event and the corresponding endElement event.</p> |
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| 48 | * |
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| 49 | * <p>Application writers who do not want to implement the entire |
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| 50 | * interface while can derive a class from Sax2HandlerBase, which implements |
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| 51 | * the default functionality; parser writers can instantiate |
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| 52 | * Sax2HandlerBase to obtain a default handler. The application can find |
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| 53 | * the location of any document event using the Locator interface |
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| 54 | * supplied by the Parser through the setDocumentLocator method.</p> |
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| 55 | * |
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| 56 | * @see Parser#setDocumentHandler |
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| 57 | * @see Locator#Locator |
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| 58 | * @see Sax2HandlerBase#Sax2HandlerBase |
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| 59 | */ |
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| 60 | |
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| 61 | class SAX2_EXPORT ContentHandler |
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| 62 | { |
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| 63 | public: |
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| 64 | /** @name Constructors and Destructor */ |
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| 65 | //@{ |
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| 66 | /** Default constructor */ |
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| 67 | ContentHandler() |
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| 68 | { |
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| 69 | } |
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| 70 | |
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| 71 | /** Destructor */ |
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| 72 | virtual ~ContentHandler() |
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| 73 | { |
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| 74 | } |
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| 75 | //@} |
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| 76 | |
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| 77 | /** @name The virtual document handler interface */ |
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| 78 | |
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| 79 | //@{ |
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| 80 | /** |
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| 81 | * Receive notification of character data. |
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| 82 | * |
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| 83 | * <p>The Parser will call this method to report each chunk of |
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| 84 | * character data. SAX parsers may return all contiguous character |
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| 85 | * data in a single chunk, or they may split it into several |
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| 86 | * chunks; however, all of the characters in any single event |
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| 87 | * must come from the same external entity, so that the Locator |
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| 88 | * provides useful information.</p> |
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| 89 | * |
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| 90 | * <p>The application must not attempt to read from the array |
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| 91 | * outside of the specified range.</p> |
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| 92 | * |
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| 93 | * <p>Note that some parsers will report whitespace using the |
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| 94 | * ignorableWhitespace() method rather than this one (validating |
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| 95 | * parsers must do so).</p> |
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| 96 | * |
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| 97 | * @param chars The characters from the XML document. |
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| 98 | * @param length The number of characters to read from the array. |
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| 99 | * @exception SAXException Any SAX exception, possibly |
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| 100 | * wrapping another exception. |
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| 101 | * @see #ignorableWhitespace |
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| 102 | * @see Locator#Locator |
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| 103 | */ |
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| 104 | virtual void characters |
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| 105 | ( |
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| 106 | const XMLCh* const chars |
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| 107 | , const unsigned int length |
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| 108 | ) = 0; |
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| 109 | |
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| 110 | /** |
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| 111 | * Receive notification of the end of a document. |
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| 112 | * |
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| 113 | * <p>The SAX parser will invoke this method only once, and it will |
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| 114 | * be the last method invoked during the parse. The parser shall |
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| 115 | * not invoke this method until it has either abandoned parsing |
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| 116 | * (because of an unrecoverable error) or reached the end of |
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| 117 | * input.</p> |
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| 118 | * |
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| 119 | * @exception SAXException Any SAX exception, possibly |
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| 120 | * wrapping another exception. |
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| 121 | */ |
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| 122 | virtual void endDocument () = 0; |
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| 123 | |
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| 124 | /** |
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| 125 | * Receive notification of the end of an element. |
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| 126 | * |
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| 127 | * <p>The SAX parser will invoke this method at the end of every |
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| 128 | * element in the XML document; there will be a corresponding |
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| 129 | * startElement() event for every endElement() event (even when the |
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| 130 | * element is empty).</p> |
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| 131 | * |
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| 132 | * @param uri The URI of the asscioated namespace for this element |
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| 133 | * @param localname The local part of the element name |
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| 134 | * @param qname The QName of this element |
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| 135 | * @exception SAXException Any SAX exception, possibly |
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| 136 | * wrapping another exception. |
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| 137 | */ |
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| 138 | virtual void endElement |
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| 139 | ( |
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| 140 | const XMLCh* const uri, |
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| 141 | const XMLCh* const localname, |
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| 142 | const XMLCh* const qname |
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| 143 | ) = 0; |
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| 144 | |
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| 145 | /** |
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| 146 | * Receive notification of ignorable whitespace in element content. |
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| 147 | * |
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| 148 | * <p>Validating Parsers must use this method to report each chunk |
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| 149 | * of ignorable whitespace (see the W3C XML 1.0 recommendation, |
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| 150 | * section 2.10): non-validating parsers may also use this method |
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| 151 | * if they are capable of parsing and using content models.</p> |
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| 152 | * |
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| 153 | * <p>SAX parsers may return all contiguous whitespace in a single |
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| 154 | * chunk, or they may split it into several chunks; however, all of |
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| 155 | * the characters in any single event must come from the same |
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| 156 | * external entity, so that the Locator provides useful |
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| 157 | * information.</p> |
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| 158 | * |
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| 159 | * <p>The application must not attempt to read from the array |
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| 160 | * outside of the specified range.</p> |
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| 161 | * |
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| 162 | * @param chars The characters from the XML document. |
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| 163 | * @param length The number of characters to read from the array. |
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| 164 | * @exception SAXException Any SAX exception, possibly |
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| 165 | * wrapping another exception. |
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| 166 | * @see #characters |
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| 167 | */ |
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| 168 | virtual void ignorableWhitespace |
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| 169 | ( |
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| 170 | const XMLCh* const chars |
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| 171 | , const unsigned int length |
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| 172 | ) = 0; |
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| 173 | |
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| 174 | /** |
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| 175 | * Receive notification of a processing instruction. |
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| 176 | * |
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| 177 | * <p>The Parser will invoke this method once for each processing |
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| 178 | * instruction found: note that processing instructions may occur |
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| 179 | * before or after the main document element.</p> |
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| 180 | * |
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| 181 | * <p>A SAX parser should never report an XML declaration (XML 1.0, |
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| 182 | * section 2.8) or a text declaration (XML 1.0, section 4.3.1) |
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| 183 | * using this method.</p> |
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| 184 | * |
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| 185 | * @param target The processing instruction target. |
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| 186 | * @param data The processing instruction data, or null if |
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| 187 | * none was supplied. |
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| 188 | * @exception SAXException Any SAX exception, possibly |
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| 189 | * wrapping another exception. |
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| 190 | */ |
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| 191 | virtual void processingInstruction |
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| 192 | ( |
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| 193 | const XMLCh* const target |
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| 194 | , const XMLCh* const data |
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| 195 | ) = 0; |
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| 196 | |
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| 197 | /** |
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| 198 | * Receive an object for locating the origin of SAX document events. |
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| 199 | * |
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| 200 | * SAX parsers are strongly encouraged (though not absolutely |
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| 201 | * required) to supply a locator: if it does so, it must supply |
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| 202 | * the locator to the application by invoking this method before |
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| 203 | * invoking any of the other methods in the DocumentHandler |
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| 204 | * interface. |
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| 205 | * |
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| 206 | * The locator allows the application to determine the end |
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| 207 | * position of any document-related event, even if the parser is |
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| 208 | * not reporting an error. Typically, the application will |
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| 209 | * use this information for reporting its own errors (such as |
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| 210 | * character content that does not match an application's |
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| 211 | * business rules). The information returned by the locator |
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| 212 | * is probably not sufficient for use with a search engine. |
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| 213 | * |
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| 214 | * Note that the locator will return correct information only |
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| 215 | * during the invocation of the events in this interface. The |
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| 216 | * application should not attempt to use it at any other time. |
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| 217 | * |
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| 218 | * @param locator An object that can return the location of |
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| 219 | * any SAX document event. The object is only |
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| 220 | * 'on loan' to the client code and they are not |
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| 221 | * to attempt to delete or modify it in any way! |
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| 222 | * |
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| 223 | * @see Locator#Locator |
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| 224 | */ |
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| 225 | virtual void setDocumentLocator(const Locator* const locator) = 0; |
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| 226 | |
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| 227 | /** |
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| 228 | * Receive notification of the beginning of a document. |
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| 229 | * |
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| 230 | * <p>The SAX parser will invoke this method only once, before any |
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| 231 | * other methods in this interface or in DTDHandler (except for |
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| 232 | * setDocumentLocator).</p> |
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| 233 | * |
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| 234 | * @exception SAXException Any SAX exception, possibly |
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| 235 | * wrapping another exception. |
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| 236 | */ |
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| 237 | virtual void startDocument() = 0; |
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| 238 | |
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| 239 | /** |
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| 240 | * Receive notification of the beginning of an element. |
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| 241 | * |
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| 242 | * <p>The Parser will invoke this method at the beginning of every |
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| 243 | * element in the XML document; there will be a corresponding |
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| 244 | * endElement() event for every startElement() event (even when the |
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| 245 | * element is empty). All of the element's content will be |
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| 246 | * reported, in order, before the corresponding endElement() |
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| 247 | * event.</p> |
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| 248 | * |
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| 249 | * <p>Note that the attribute list provided will |
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| 250 | * contain only attributes with explicit values (specified or |
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| 251 | * defaulted): #IMPLIED attributes will be omitted.</p> |
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| 252 | * |
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| 253 | * @param uri The URI of the asscioated namespace for this element |
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| 254 | * @param localname The local part of the element name |
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| 255 | * @param qname The QName of this element |
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| 256 | * @param attrs The attributes attached to the element, if any. |
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| 257 | * @exception SAXException Any SAX exception, possibly |
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| 258 | * wrapping another exception. |
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| 259 | * @see #endElement |
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| 260 | * @see Attributes#Attributes |
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| 261 | */ |
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| 262 | virtual void startElement |
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| 263 | ( |
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| 264 | const XMLCh* const uri, |
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| 265 | const XMLCh* const localname, |
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| 266 | const XMLCh* const qname, |
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| 267 | const Attributes& attrs |
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| 268 | ) = 0; |
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| 269 | |
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| 270 | /** |
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| 271 | * Receive notification of the start of an namespace prefix mapping. |
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| 272 | * |
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| 273 | * <p>By default, do nothing. Application writers may override this |
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| 274 | * method in a subclass to take specific actions at the start of |
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| 275 | * each namespace prefix mapping.</p> |
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| 276 | * |
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| 277 | * @param prefix The namespace prefix used |
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| 278 | * @param uri The namespace URI used. |
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| 279 | * @exception SAXException Any SAX exception, possibly |
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| 280 | * wrapping another exception. |
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| 281 | */ |
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| 282 | virtual void startPrefixMapping |
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| 283 | ( |
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| 284 | const XMLCh* const prefix, |
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| 285 | const XMLCh* const uri |
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| 286 | ) = 0 ; |
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| 287 | |
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| 288 | /** |
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| 289 | * Receive notification of the end of an namespace prefix mapping. |
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| 290 | * |
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| 291 | * <p>By default, do nothing. Application writers may override this |
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| 292 | * method in a subclass to take specific actions at the end of |
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| 293 | * each namespace prefix mapping.</p> |
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| 294 | * |
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| 295 | * @param prefix The namespace prefix used |
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| 296 | * @exception SAXException Any SAX exception, possibly |
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| 297 | * wrapping another exception. |
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| 298 | */ |
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| 299 | virtual void endPrefixMapping |
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| 300 | ( |
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| 301 | const XMLCh* const prefix |
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| 302 | ) = 0 ; |
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| 303 | |
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| 304 | /** |
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| 305 | * Receive notification of a skipped entity |
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| 306 | * |
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| 307 | * <p>The parser will invoke this method once for each entity |
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| 308 | * skipped. All processors may skip external entities, |
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| 309 | * depending on the values of the features:<br> |
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| 310 | * http://xml.org/sax/features/external-general-entities<br> |
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| 311 | * http://xml.org/sax/features/external-parameter-entities</p> |
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| 312 | * |
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| 313 | * <p>Note: Xerces (specifically) never skips any entities, regardless |
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| 314 | * of the above features. This function is never called in the |
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| 315 | * Xerces implementation of SAX2.</p> |
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| 316 | * |
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| 317 | * <p>Introduced with SAX2</p> |
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| 318 | * |
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| 319 | * @param name The name of the skipped entity. If it is a parameter entity, |
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| 320 | * the name will begin with %, and if it is the external DTD subset, |
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| 321 | * it will be the string [dtd]. |
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| 322 | * @exception SAXException Any SAX exception, possibly |
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| 323 | * wrapping another exception. |
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| 324 | */ |
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| 325 | virtual void skippedEntity |
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| 326 | ( |
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| 327 | const XMLCh* const name |
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| 328 | ) = 0 ; |
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| 329 | |
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| 330 | //@} |
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| 331 | private : |
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| 332 | /* Unimplemented Constructors and operators */ |
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| 333 | /* Copy constructor */ |
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| 334 | ContentHandler(const ContentHandler&); |
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| 335 | /** Assignment operator */ |
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| 336 | ContentHandler& operator=(const ContentHandler&); |
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| 337 | }; |
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| 338 | |
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| 339 | XERCES_CPP_NAMESPACE_END |
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| 340 | |
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| 341 | #endif |
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