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Java > Open Source Codes > com > sun > org > apache > xerces > internal > xni > parser > XMLDTDScanner


1 /*
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4  *
5  * Copyright (c) 2001, 2002 The Apache Software Foundation.
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25  * if and wherever such third-party acknowledgments normally appear.
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57
58 package com.sun.org.apache.xerces.internal.xni.parser;
59
60 import java.io.IOException JavaDoc;
61 import com.sun.org.apache.xerces.internal.xni.XNIException;
62
63 /**
64  * This interface defines a generic DTD scanner. This interface
65  * allows a scanner to be used interchangably in existing parser
66  * configurations.
67  * <p>
68  * If the parser configuration uses a DTD scanner that implements
69  * this interface, components should be able to query the scanner
70  * instance from the component manager using the following property
71  * identifier:
72  * <blockquote>
73  * "http://apache.org/xml/properties/internal/dtd-scanner"
74  * </blockquote>
75  *
76  * @author Andy Clark, IBM
77  *
78  * @version $Id: XMLDTDScanner.java,v 1.5 2002/11/19 01:41:38 twl Exp $
79  */
80 public interface XMLDTDScanner
81     extends XMLDTDSource, XMLDTDContentModelSource {
82
83     //
84 // XMLDTDScanner methods
85 //
86
87     /**
88      * Sets the input source.
89      *
90      * @param inputSource The input source or null.
91      *
92      * @throws IOException Thrown on i/o error.
93      */
94     public void setInputSource(XMLInputSource inputSource) throws IOException JavaDoc;
95
96     /**
97      * Scans the internal subset of the document.
98      *
99      * @param complete True if the scanner should scan the document
100      * completely, pushing all events to the registered
101      * document handler. A value of false indicates that
102      * that the scanner should only scan the next portion
103      * of the document and return. A scanner instance is
104      * permitted to completely scan a document if it does
105      * not support this "pull" scanning model.
106      * @param standalone True if the document was specified as standalone.
107      * This value is important for verifying certain
108      * well-formedness constraints.
109      * @param hasExternalDTD True if the document has an external DTD.
110      * This allows the scanner to properly notify
111      * the handler of the end of the DTD in the
112      * absence of an external subset.
113      *
114      * @return True if there is more to scan, false otherwise.
115      */
116     public boolean scanDTDInternalSubset(boolean complete, boolean standalone,
117                                          boolean hasExternalSubset)
118         throws IOException JavaDoc, XNIException;
119
120     /**
121      * Scans the external subset of the document.
122      *
123      * @param complete True if the scanner should scan the document
124      * completely, pushing all events to the registered
125      * document handler. A value of false indicates that
126      * that the scanner should only scan the next portion
127      * of the document and return. A scanner instance is
128      * permitted to completely scan a document if it does
129      * not support this "pull" scanning model.
130      *
131      * @return True if there is more to scan, false otherwise.
132      */
133     public boolean scanDTDExternalSubset(boolean complete)
134         throws IOException JavaDoc, XNIException;
135
136 } // interface XMLDTDScanner
137
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