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/*
 * 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.jaxp.validation;

import javax.xml.transform.stream.StreamSource;

import org.apache.xerces.xni.XNIException;
import org.apache.xerces.xni.parser.XMLInputSource;
import org.apache.xerces.xni.parser.XMLParseException;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

/**
 * Static utility methods for the Validation API implementation.
 *
 * @author Kohsuke Kawaguchi ([email protected])
 * @version $Id: Util.java 447235 2006-09-18 05:01:44Z mrglavas $
 */
final class Util {
    
    /**
     * Creates a proper {@link XMLInputSource} from a {@link StreamSource}.
     *
     * @return always return non-null valid object.
     */
    public static final XMLInputSource toXMLInputSource( StreamSource in ) {
        if( in.getReader()!=null )
            return new XMLInputSource(
            in.getPublicId(), in.getSystemId(), in.getSystemId(),
            in.getReader(), null );
        if( in.getInputStream()!=null )
            return new XMLInputSource(
            in.getPublicId(), in.getSystemId(), in.getSystemId(),
            in.getInputStream(), null );
        
        return new XMLInputSource(
        in.getPublicId(), in.getSystemId(), in.getSystemId() );
    }
    
    /**
     * Reconstructs {@link SAXException} from XNIException.
     */
    public static SAXException toSAXException(XNIException e) {
        if(e instanceof XMLParseException)
            return toSAXParseException((XMLParseException)e);
        if( e.getException() instanceof SAXException )
            return (SAXException)e.getException();
        return new SAXException(e.getMessage(),e.getException());
    }
    
    public static SAXParseException toSAXParseException( XMLParseException e ) {
        if( e.getException() instanceof SAXParseException )
            return (SAXParseException)e.getException();
        return new SAXParseException( e.getMessage(),
        e.getPublicId(), e.getExpandedSystemId(),
        e.getLineNumber(), e.getColumnNumber(),
        e.getException() );
    }
    
} // Util