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// Locator.java - SAX locator interface for document events.
// http://www.saxproject.org
// Written by David Megginson
// No warranty; no copyright -- use this as you will.

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 {@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 * @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




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