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package com.sun.org.apache.xerces.internal.impl;

import java.io.IOException;

import com.sun.org.apache.xerces.internal.xni.XNIException;
import com.sun.org.apache.xerces.internal.xni.grammars.XMLDTDDescription;
import com.sun.org.apache.xerces.internal.xni.parser.XMLEntityResolver;
import com.sun.org.apache.xerces.internal.xni.parser.XMLInputSource;


This interface extends XMLEntityResolver providing
a method to resolve external subsets for documents which do not
explicitly provide one. The application can register an object that
implements this interface with the parser configuration. If registered,
it will be queried to locate an external subset when none is provided,
even for documents that do not contain DOCTYPE declarations. If the
registered external subset resolver does not provide an external subset
for a given document, it should return null.


Author:Michael Glavassevich, IBM
@xerces.internal
/**
 * <p>This interface extends <code>XMLEntityResolver</code> providing
 * a method to resolve external subsets for documents which do not
 * explicitly provide one. The application can register an object that
 * implements this interface with the parser configuration. If registered,
 * it will be queried to locate an external subset when none is provided,
 * even for documents that do not contain DOCTYPE declarations. If the
 * registered external subset resolver does not provide an external subset
 * for a given document, it should return <code>null</code>.</p>
 *
 * @xerces.internal
 *
 * @author Michael Glavassevich, IBM
 *
 */
public interface ExternalSubsetResolver
    extends XMLEntityResolver {

    //
    // ExternalSubsetResolver methods
    //

    
Locates an external subset for documents which do not explicitly
provide one. If no external subset is provided, this method should
return null.


Params:
  • grammarDescription – a description of the DTD
Throws:
  • XNIException – Thrown on general error.
  • IOException –  Thrown if resolved entity stream cannot be
                     opened or some other i/o error occurs.
/**
     * <p>Locates an external subset for documents which do not explicitly
     * provide one. If no external subset is provided, this method should
     * return <code>null</code>.</p>
     *
     * @param grammarDescription a description of the DTD
     *
     * @throws XNIException Thrown on general error.
     * @throws IOException  Thrown if resolved entity stream cannot be
     *                      opened or some other i/o error occurs.
     */
    public XMLInputSource getExternalSubset(XMLDTDDescription grammarDescription)
        throws XNIException, IOException;

} // interface ExternalSubsetResolver