/*
 * Copyright 2005 The Apache Software Foundation.
 * 
 * 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 com.sun.org.apache.xerces.internal.jaxp.validation;

import javax.xml.transform.stream.StreamSource;

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

/**
 * <p>Static utility methods for the Validation API implementation.</p>
 *
 * @author Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
 * @version $Id: Util.java,v 1.2.6.1 2005/09/01 14:16:37 sunithareddy Exp $
 */
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