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package org.xml.sax;
Interface for associating a SAX event with a document location.
If a SAX parser provides location information to the SAX application, it does so by implementing this interface and then passing an instance to the application using the content handler's
setDocumentLocator method. The application can use the object to obtain the location of any other SAX event in the XML source document.
Note that the results returned by the object will be valid only
during the scope of each callback method: the application
will receive unpredictable results if it attempts to use the
locator at any other time, or after parsing completes.
SAX parsers are not required to supply a locator, but they are very strongly encouraged to do so. If the parser supplies a locator, it must do so before reporting any other document events. If no locator has been set by the time the application receives the startDocument event, the application should assume that a locator is not available.
Author: David Megginson See Also: Since: 1.4, SAX 1.0
/**
* Interface for associating a SAX event with a document location.
*
* <p>If a SAX parser provides location information to the SAX
* application, it does so by implementing this interface and then
* passing an instance to the application using the content
* handler's {@link org.xml.sax.ContentHandler#setDocumentLocator
* setDocumentLocator} method. The application can use the
* object to obtain the location of any other SAX event
* in the XML source document.</p>
*
* <p>Note that the results returned by the object will be valid only
* during the scope of each callback method: the application
* will receive unpredictable results if it attempts to use the
* locator at any other time, or after parsing completes.</p>
*
* <p>SAX parsers are not required to supply a locator, but they are
* very strongly encouraged to do so. If the parser supplies a
* locator, it must do so before reporting any other document events.
* If no locator has been set by the time the application receives
* the {@link org.xml.sax.ContentHandler#startDocument startDocument}
* event, the application should assume that a locator is not
* available.</p>
*
* @since 1.4, SAX 1.0
* @author David Megginson
* @see org.xml.sax.ContentHandler#setDocumentLocator
*/
public interface Locator {
Return the public identifier for the current document event.
The return value is the public identifier of the document
entity or of the external parsed entity in which the markup
triggering the event appears.
See Also: Returns: A string containing the public identifier, or
null if none is available.
/**
* Return the public identifier for the current document event.
*
* <p>The return value is the public identifier of the document
* entity or of the external parsed entity in which the markup
* triggering the event appears.</p>
*
* @return A string containing the public identifier, or
* null if none is available.
* @see #getSystemId
*/
public abstract String getPublicId ();
Return the system identifier for the current document event.
The return value is the system identifier of the document
entity or of the external parsed entity in which the markup
triggering the event appears.
If the system identifier is a URL, the parser must resolve it
fully before passing it to the application. For example, a file
name must always be provided as a file:... URL, and other
kinds of relative URI are also resolved against their bases.
See Also: Returns: A string containing the system identifier, or null
if none is available.
/**
* Return the system identifier for the current document event.
*
* <p>The return value is the system identifier of the document
* entity or of the external parsed entity in which the markup
* triggering the event appears.</p>
*
* <p>If the system identifier is a URL, the parser must resolve it
* fully before passing it to the application. For example, a file
* name must always be provided as a <em>file:...</em> URL, and other
* kinds of relative URI are also resolved against their bases.</p>
*
* @return A string containing the system identifier, or null
* if none is available.
* @see #getPublicId
*/
public abstract String getSystemId ();
Return the line number where the current document event ends.
Lines are delimited by line ends, which are defined in
the XML specification.
Warning: The return value from the method
is intended only as an approximation for the sake of diagnostics;
it is not intended to provide sufficient information
to edit the character content of the original XML document.
In some cases, these "line" numbers match what would be displayed
as columns, and in others they may not match the source text
due to internal entity expansion.
The return value is an approximation of the line number
in the document entity or external parsed entity where the
markup triggering the event appears.
If possible, the SAX driver should provide the line position
of the first character after the text associated with the document
event. The first line is line 1.
See Also: Returns: The line number, or -1 if none is available.
/**
* Return the line number where the current document event ends.
* Lines are delimited by line ends, which are defined in
* the XML specification.
*
* <p><strong>Warning:</strong> The return value from the method
* is intended only as an approximation for the sake of diagnostics;
* it is not intended to provide sufficient information
* to edit the character content of the original XML document.
* In some cases, these "line" numbers match what would be displayed
* as columns, and in others they may not match the source text
* due to internal entity expansion. </p>
*
* <p>The return value is an approximation of the line number
* in the document entity or external parsed entity where the
* markup triggering the event appears.</p>
*
* <p>If possible, the SAX driver should provide the line position
* of the first character after the text associated with the document
* event. The first line is line 1.</p>
*
* @return The line number, or -1 if none is available.
* @see #getColumnNumber
*/
public abstract int getLineNumber ();
Return the column number where the current document event ends.
This is one-based number of Java char values since
the last line end.
Warning: The return value from the method
is intended only as an approximation for the sake of diagnostics;
it is not intended to provide sufficient information
to edit the character content of the original XML document.
For example, when lines contain combining character sequences, wide
characters, surrogate pairs, or bi-directional text, the value may
not correspond to the column in a text editor's display.
The return value is an approximation of the column number
in the document entity or external parsed entity where the
markup triggering the event appears.
If possible, the SAX driver should provide the line position
of the first character after the text associated with the document
event. The first column in each line is column 1.
See Also: Returns: The column number, or -1 if none is available.
/**
* Return the column number where the current document event ends.
* This is one-based number of Java <code>char</code> values since
* the last line end.
*
* <p><strong>Warning:</strong> The return value from the method
* is intended only as an approximation for the sake of diagnostics;
* it is not intended to provide sufficient information
* to edit the character content of the original XML document.
* For example, when lines contain combining character sequences, wide
* characters, surrogate pairs, or bi-directional text, the value may
* not correspond to the column in a text editor's display. </p>
*
* <p>The return value is an approximation of the column number
* in the document entity or external parsed entity where the
* markup triggering the event appears.</p>
*
* <p>If possible, the SAX driver should provide the line position
* of the first character after the text associated with the document
* event. The first column in each line is column 1.</p>
*
* @return The column number, or -1 if none is available.
* @see #getLineNumber
*/
public abstract int getColumnNumber ();
}
// end of Locator.java