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// SAX locator interface for document events.
// http://www.saxproject.org
// No warranty; no copyright -- use this as you will.
// $Id: Locator.java,v 1.8 2002/01/30 21:13:47 dbrownell Exp $
package org.xml.sax;
/**
* Interface for associating a SAX event with a document location.
*
*
* This module, both source code and documentation, is in the
* Public Domain, and comes with NO WARRANTY.
* See http://www.saxproject.org
* for further information.
*
*
* 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.
*
* 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 {@link org.xml.sax.ContentHandler#startDocument startDocument}
* event, the application should assume that a locator is not
* available.
*
* @since SAX 1.0
* @author David Megginson
* @version 2.0.1 (sax2r2)
* @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.
*
* @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.
*
* @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.
*
* @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.
*
* @return The column number, or -1 if none is available.
* @see #getLineNumber
*/
public abstract int getColumnNumber ();
}
// end of Locator.java