Position.java

/*
 * Position.java July 2006
 *
 * Copyright (C) 2006, Niall Gallagher <niallg@users.sf.net>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
 * implied. See the License for the specific language governing 
 * permissions and limitations under the License.
 */

package org.simpleframework.xml.stream;

/**
 * The <code>Position</code> object is used to acquire the position
 * of the read cursor within the XML file. This allows exceptions to
 * be thrown with the line number so that the XML can be debugged. 
 * 
 * @author Niall Gallagher
 */ 
public interface Position {

   /**
    * This is the actual line number within the read XML document. 
    * The line number allows any problems within the source XML
    * document to be debugged if it does not match the schema. 
    * This will return -1 if the line number cannot be determined.
    *
    * @return this returns the line number of an XML event 
    */        
   int getLine();

   /**
    * This provides a textual description of the position the 
    * read cursor is at within the XML document. This allows the
    * position to be embedded within the exception thrown.
    *
    * @return this returns a textual description of the position
    */ 
   String toString();   
}