/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.xerces.xni;

/**
 * Location information.
 *
 * @author Andy Clark, IBM
 *
 * @version $Id: XMLLocator.java 447247 2006-09-18 05:23:52Z mrglavas $
 */
public interface XMLLocator {

    //
    // XMLLocator methods
    //
    
    /** Returns the public identifier. */
    public String getPublicId();
    
    /** Returns the literal system identifier. */
    public String getLiteralSystemId();
    
    /** Returns the base system identifier. */
    public String getBaseSystemId();
    
    /** Returns the expanded system identifier. */
    public String getExpandedSystemId();
    
    /** Returns the line number, or <code>-1</code> if no line number is available. */
    public int getLineNumber();
  
    /** Returns the column number, or <code>-1</code> if no column number is available. */
    public int getColumnNumber();
    
    /** Returns the character offset, or <code>-1</code> if no character offset is available. */
    public int getCharacterOffset();

    /** 
     * Returns the encoding of the current entity.  
     * Note that, for a given entity, this value can only be
     * considered final once the encoding declaration has been read (or once it
     * has been determined that there is no such declaration) since, no encoding
     * having been specified on the XMLInputSource, the parser
     * will make an initial "guess" which could be in error. 
     */
    public String getEncoding();
    
    /** 
     * Returns the XML version of the current entity. This will normally be the
     * value from the XML or text declaration or defaulted by the parser. Note that
     * that this value may be different than the version of the processing rules 
     * applied to the current entity. For instance, an XML 1.1 document may refer to
     * XML 1.0 entities. In such a case the rules of XML 1.1 are applied to the entire 
     * document. Also note that, for a given entity, this value can only be considered
     * final once the XML or text declaration has been read or once it has been
     * determined that there is no such declaration.
     */
    public String getXMLVersion();


} // interface XMLLocator
