author | chegar |
Thu, 17 Oct 2019 20:54:25 +0100 | |
branch | datagramsocketimpl-branch |
changeset 58679 | 9c3209ff7550 |
parent 58678 | 9cf78a70fa4f |
parent 58247 | 3aef3bccfae3 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package org.xml.sax; |
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/** |
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* Receive notification of the logical content of a document. |
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* |
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* <p>This is the main interface that most SAX applications |
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* implement: if the application needs to be informed of basic parsing |
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* events, it implements this interface and registers an instance with |
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* the SAX parser using the {@link org.xml.sax.XMLReader#setContentHandler |
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* setContentHandler} method. The parser uses the instance to report |
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* basic document-related events like the start and end of elements |
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* and character data.</p> |
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* |
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* <p>The order of events in this interface is very important, and |
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* mirrors the order of information in the document itself. For |
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* example, all of an element's content (character data, processing |
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* instructions, and/or subelements) will appear, in order, between |
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* the startElement event and the corresponding endElement event.</p> |
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* |
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* <p>This interface is similar to the now-deprecated SAX 1.0 |
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* DocumentHandler interface, but it adds support for Namespaces |
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* and for reporting skipped entities (in non-validating XML |
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* processors).</p> |
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* |
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* <p>Implementors should note that there is also a |
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* <code>ContentHandler</code> class in the <code>java.net</code> |
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* package; that means that it's probably a bad idea to do</p> |
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* |
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* <pre>import java.net.*; |
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* import org.xml.sax.*; |
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* </pre> |
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* |
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* <p>In fact, "import ...*" is usually a sign of sloppy programming |
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* anyway, so the user should consider this a feature rather than a |
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* bug.</p> |
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* |
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* @since 1.4, SAX 2.0 |
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* @author David Megginson |
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* @see org.xml.sax.XMLReader |
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* @see org.xml.sax.DTDHandler |
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* @see org.xml.sax.ErrorHandler |
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*/ |
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public interface ContentHandler |
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{ |
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/** |
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* Receive an object for locating the origin of SAX document events. |
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* |
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* <p>SAX parsers are strongly encouraged (though not absolutely |
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* required) to supply a locator: if it does so, it must supply |
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* the locator to the application by invoking this method before |
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* invoking any of the other methods in the ContentHandler |
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* interface.</p> |
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* |
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* <p>The locator allows the application to determine the end |
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* position of any document-related event, even if the parser is |
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* not reporting an error. Typically, the application will |
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* use this information for reporting its own errors (such as |
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* character content that does not match an application's |
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* business rules). The information returned by the locator |
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* is probably not sufficient for use with a search engine.</p> |
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* |
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* <p>Note that the locator will return correct information only |
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* during the invocation SAX event callbacks after |
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* {@link #startDocument startDocument} returns and before |
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* {@link #endDocument endDocument} is called. The |
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* application should not attempt to use it at any other time.</p> |
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* |
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* @param locator an object that can return the location of |
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* any SAX document event |
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* @see org.xml.sax.Locator |
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*/ |
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public void setDocumentLocator (Locator locator); |
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/** |
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* Receive notification of the beginning of a document. |
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* |
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* <p>The SAX parser will invoke this method only once, before any |
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* other event callbacks (except for {@link #setDocumentLocator |
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* setDocumentLocator}).</p> |
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* |
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* @throws org.xml.sax.SAXException any SAX exception, possibly |
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* wrapping another exception |
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* @see #endDocument |
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*/ |
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public void startDocument () |
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throws SAXException; |
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/** |
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* Receives notification of the XML declaration. |
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* |
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* @implSpec |
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* The default implementation in the SAX API is to do nothing. |
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* |
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* @param version the version string as in the input document, null if not |
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* specified |
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* @param encoding the encoding string as in the input document, null if not |
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* specified |
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* @param standalone the standalone string as in the input document, null if |
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* not specified |
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* |
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* @throws SAXException if the application wants to report an error or |
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* interrupt the parsing process |
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* |
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* @since 14 |
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*/ |
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default void declaration(String version, String encoding, String standalone) |
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throws SAXException |
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{ |
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//no op |
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} |
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/** |
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* Receive notification of the end of a document. |
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* |
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* <p> |
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* This method is invoked by the parser to signal it has reached the end of |
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* the document after successfully completing the parsing process. |
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* After the event, the parser will return the control to the application. |
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* |
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* @apiNote In case of a fatal error, the parser may choose to stop the |
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* parsing process with a {@link SAXException}, in which case, this method |
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* will never be called. Refer to |
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* {@link ErrorHandler#fatalError(org.xml.sax.SAXParseException)}. |
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* |
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* @throws org.xml.sax.SAXException any SAX exception, possibly |
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* wrapping another exception |
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* @see #startDocument |
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*/ |
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public void endDocument() |
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throws SAXException; |
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/** |
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* Begin the scope of a prefix-URI Namespace mapping. |
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* |
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* <p>The information from this event is not necessary for |
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* normal Namespace processing: the SAX XML reader will |
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* automatically replace prefixes for element and attribute |
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* names when the <code>http://xml.org/sax/features/namespaces</code> |
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* feature is <var>true</var> (the default).</p> |
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* |
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* <p>There are cases, however, when applications need to |
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* use prefixes in character data or in attribute values, |
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* where they cannot safely be expanded automatically; the |
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* start/endPrefixMapping event supplies the information |
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* to the application to expand prefixes in those contexts |
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* itself, if necessary.</p> |
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* |
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* <p>Note that start/endPrefixMapping events are not |
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* guaranteed to be properly nested relative to each other: |
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* all startPrefixMapping events will occur immediately before the |
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* corresponding {@link #startElement startElement} event, |
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* and all {@link #endPrefixMapping endPrefixMapping} |
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* events will occur immediately after the corresponding |
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* {@link #endElement endElement} event, |
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* but their order is not otherwise |
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* guaranteed.</p> |
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* |
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* <p>There should never be start/endPrefixMapping events for the |
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* "xml" prefix, since it is predeclared and immutable.</p> |
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* |
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* @param prefix the Namespace prefix being declared. |
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* An empty string is used for the default element namespace, |
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* which has no prefix. |
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* @param uri the Namespace URI the prefix is mapped to |
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* @throws org.xml.sax.SAXException the client may throw |
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* an exception during processing |
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* @see #endPrefixMapping |
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* @see #startElement |
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*/ |
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public void startPrefixMapping (String prefix, String uri) |
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throws SAXException; |
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/** |
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* End the scope of a prefix-URI mapping. |
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* |
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* <p>See {@link #startPrefixMapping startPrefixMapping} for |
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* details. These events will always occur immediately after the |
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* corresponding {@link #endElement endElement} event, but the order of |
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* {@link #endPrefixMapping endPrefixMapping} events is not otherwise |
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* guaranteed.</p> |
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* |
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* @param prefix the prefix that was being mapped. |
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* This is the empty string when a default mapping scope ends. |
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* @throws org.xml.sax.SAXException the client may throw |
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* an exception during processing |
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* @see #startPrefixMapping |
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* @see #endElement |
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*/ |
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public void endPrefixMapping (String prefix) |
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throws SAXException; |
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/** |
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* Receive notification of the beginning of an element. |
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* |
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* <p>The Parser will invoke this method at the beginning of every |
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* element in the XML document; there will be a corresponding |
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* {@link #endElement endElement} event for every startElement event |
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* (even when the element is empty). All of the element's content will be |
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* reported, in order, before the corresponding endElement |
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* event.</p> |
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* |
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* <p>This event allows up to three name components for each |
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* element:</p> |
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* |
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* <ol> |
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* <li>the Namespace URI;</li> |
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* <li>the local name; and</li> |
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* <li>the qualified (prefixed) name.</li> |
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* </ol> |
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* |
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* <p>Any or all of these may be provided, depending on the |
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* values of the <var>http://xml.org/sax/features/namespaces</var> |
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* and the <var>http://xml.org/sax/features/namespace-prefixes</var> |
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* properties:</p> |
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* |
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* <ul> |
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* <li>the Namespace URI and local name are required when |
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* the namespaces property is <var>true</var> (the default), and are |
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* optional when the namespaces property is <var>false</var> (if one is |
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* specified, both must be);</li> |
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* <li>the qualified name is required when the namespace-prefixes property |
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* is <var>true</var>, and is optional when the namespace-prefixes property |
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* is <var>false</var> (the default).</li> |
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* </ul> |
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* |
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* <p>Note that the attribute list provided will contain only |
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* attributes with explicit values (specified or defaulted): |
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* #IMPLIED attributes will be omitted. The attribute list |
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* will contain attributes used for Namespace declarations |
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* (xmlns* attributes) only if the |
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* <code>http://xml.org/sax/features/namespace-prefixes</code> |
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* property is true (it is false by default, and support for a |
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* true value is optional).</p> |
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* |
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* <p>Like {@link #characters characters()}, attribute values may have |
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* characters that need more than one <code>char</code> value. </p> |
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* |
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* @param uri the Namespace URI, or the empty string if the |
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* element has no Namespace URI or if Namespace |
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* processing is not being performed |
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* @param localName the local name (without prefix), or the |
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* empty string if Namespace processing is not being |
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* performed |
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* @param qName the qualified name (with prefix), or the |
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* empty string if qualified names are not available |
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* @param atts the attributes attached to the element. If |
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* there are no attributes, it shall be an empty |
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* Attributes object. The value of this object after |
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* startElement returns is undefined |
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* @throws org.xml.sax.SAXException any SAX exception, possibly |
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* wrapping another exception |
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* @see #endElement |
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* @see org.xml.sax.Attributes |
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* @see org.xml.sax.helpers.AttributesImpl |
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*/ |
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public void startElement (String uri, String localName, |
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String qName, Attributes atts) |
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throws SAXException; |
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/** |
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* Receive notification of the end of an element. |
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* |
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* <p>The SAX parser will invoke this method at the end of every |
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* element in the XML document; there will be a corresponding |
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* {@link #startElement startElement} event for every endElement |
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* event (even when the element is empty).</p> |
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* |
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* <p>For information on the names, see startElement.</p> |
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* |
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* @param uri the Namespace URI, or the empty string if the |
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* element has no Namespace URI or if Namespace |
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* processing is not being performed |
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* @param localName the local name (without prefix), or the |
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* empty string if Namespace processing is not being |
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* performed |
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* @param qName the qualified XML name (with prefix), or the |
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* empty string if qualified names are not available |
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* @throws org.xml.sax.SAXException any SAX exception, possibly |
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* wrapping another exception |
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*/ |
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public void endElement (String uri, String localName, |
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String qName) |
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throws SAXException; |
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/** |
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* Receive notification of character data. |
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* |
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* <p>The Parser will call this method to report each chunk of |
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* character data. SAX parsers may return all contiguous character |
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* data in a single chunk, or they may split it into several |
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* chunks; however, all of the characters in any single event |
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* must come from the same external entity so that the Locator |
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* provides useful information.</p> |
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* |
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* <p>The application must not attempt to read from the array |
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* outside of the specified range.</p> |
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* |
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* <p>Individual characters may consist of more than one Java |
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* <code>char</code> value. There are two important cases where this |
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* happens, because characters can't be represented in just sixteen bits. |
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* In one case, characters are represented in a <em>Surrogate Pair</em>, |
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* using two special Unicode values. Such characters are in the so-called |
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* "Astral Planes", with a code point above U+FFFF. A second case involves |
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* composite characters, such as a base character combining with one or |
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* more accent characters. </p> |
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* |
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* <p> Your code should not assume that algorithms using |
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* <code>char</code>-at-a-time idioms will be working in character |
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* units; in some cases they will split characters. This is relevant |
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* wherever XML permits arbitrary characters, such as attribute values, |
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* processing instruction data, and comments as well as in data reported |
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* from this method. It's also generally relevant whenever Java code |
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* manipulates internationalized text; the issue isn't unique to XML.</p> |
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* |
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* <p>Note that some parsers will report whitespace in element |
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* content using the {@link #ignorableWhitespace ignorableWhitespace} |
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* method rather than this one (validating parsers <em>must</em> |
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* do so).</p> |
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* |
|
353 |
* @param ch the characters from the XML document |
|
354 |
* @param start the start position in the array |
|
355 |
* @param length the number of characters to read from the array |
|
356 |
* @throws org.xml.sax.SAXException any SAX exception, possibly |
|
357 |
* wrapping another exception |
|
358 |
* @see #ignorableWhitespace |
|
359 |
* @see org.xml.sax.Locator |
|
360 |
*/ |
|
361 |
public void characters (char ch[], int start, int length) |
|
362 |
throws SAXException; |
|
363 |
||
364 |
||
365 |
/** |
|
366 |
* Receive notification of ignorable whitespace in element content. |
|
367 |
* |
|
368 |
* <p>Validating Parsers must use this method to report each chunk |
|
369 |
* of whitespace in element content (see the W3C XML 1.0 |
|
370 |
* recommendation, section 2.10): non-validating parsers may also |
|
371 |
* use this method if they are capable of parsing and using |
|
372 |
* content models.</p> |
|
373 |
* |
|
374 |
* <p>SAX parsers may return all contiguous whitespace in a single |
|
375 |
* chunk, or they may split it into several chunks; however, all of |
|
376 |
* the characters in any single event must come from the same |
|
377 |
* external entity, so that the Locator provides useful |
|
378 |
* information.</p> |
|
379 |
* |
|
380 |
* <p>The application must not attempt to read from the array |
|
381 |
* outside of the specified range.</p> |
|
382 |
* |
|
383 |
* @param ch the characters from the XML document |
|
384 |
* @param start the start position in the array |
|
385 |
* @param length the number of characters to read from the array |
|
386 |
* @throws org.xml.sax.SAXException any SAX exception, possibly |
|
387 |
* wrapping another exception |
|
388 |
* @see #characters |
|
389 |
*/ |
|
390 |
public void ignorableWhitespace (char ch[], int start, int length) |
|
391 |
throws SAXException; |
|
392 |
||
393 |
||
394 |
/** |
|
395 |
* Receive notification of a processing instruction. |
|
396 |
* |
|
397 |
* <p>The Parser will invoke this method once for each processing |
|
398 |
* instruction found: note that processing instructions may occur |
|
399 |
* before or after the main document element.</p> |
|
400 |
* |
|
401 |
* <p>A SAX parser must never report an XML declaration (XML 1.0, |
|
402 |
* section 2.8) or a text declaration (XML 1.0, section 4.3.1) |
|
403 |
* using this method.</p> |
|
404 |
* |
|
405 |
* <p>Like {@link #characters characters()}, processing instruction |
|
406 |
* data may have characters that need more than one <code>char</code> |
|
407 |
* value. </p> |
|
408 |
* |
|
409 |
* @param target the processing instruction target |
|
410 |
* @param data the processing instruction data, or null if |
|
411 |
* none was supplied. The data does not include any |
|
412 |
* whitespace separating it from the target |
|
413 |
* @throws org.xml.sax.SAXException any SAX exception, possibly |
|
414 |
* wrapping another exception |
|
415 |
*/ |
|
416 |
public void processingInstruction (String target, String data) |
|
417 |
throws SAXException; |
|
418 |
||
419 |
||
420 |
/** |
|
421 |
* Receive notification of a skipped entity. |
|
422 |
* This is not called for entity references within markup constructs |
|
423 |
* such as element start tags or markup declarations. (The XML |
|
424 |
* recommendation requires reporting skipped external entities. |
|
425 |
* SAX also reports internal entity expansion/non-expansion, except |
|
426 |
* within markup constructs.) |
|
427 |
* |
|
428 |
* <p>The Parser will invoke this method each time the entity is |
|
429 |
* skipped. Non-validating processors may skip entities if they |
|
430 |
* have not seen the declarations (because, for example, the |
|
431 |
* entity was declared in an external DTD subset). All processors |
|
432 |
* may skip external entities, depending on the values of the |
|
433 |
* <code>http://xml.org/sax/features/external-general-entities</code> |
|
434 |
* and the |
|
435 |
* <code>http://xml.org/sax/features/external-parameter-entities</code> |
|
436 |
* properties.</p> |
|
437 |
* |
|
438 |
* @param name the name of the skipped entity. If it is a |
|
439 |
* parameter entity, the name will begin with '%', and if |
|
440 |
* it is the external DTD subset, it will be the string |
|
441 |
* "[dtd]" |
|
442 |
* @throws org.xml.sax.SAXException any SAX exception, possibly |
|
443 |
* wrapping another exception |
|
444 |
*/ |
|
445 |
public void skippedEntity (String name) |
|
446 |
throws SAXException; |
|
447 |
} |
|
448 |
||
449 |
// end of ContentHandler.java |