/*
 * @(#)$Id: EnumerationFacet.java,v 1.19 2002/06/24 19:57:28 kk122374 Exp $
 *
 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */
package com.sun.msv.datatype.xsd;

import java.util.Set;
import java.util.Vector;
import org.relaxng.datatype.DatatypeException;
import org.relaxng.datatype.ValidationContext;

/**
 * "enumeration" facets validator.
 * 
 * @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
 */
public class EnumerationFacet extends DataTypeWithValueConstraintFacet {
	protected EnumerationFacet( String nsUri, String typeName, XSDatatypeImpl baseType, TypeIncubator facets )
		throws DatatypeException {
		super(nsUri,typeName,baseType,FACET_ENUMERATION,facets);
		values = new java.util.HashSet( facets.getVector(FACET_ENUMERATION) );
	}
	
	/** set of valid values */
	public final Set values;

	public Object _createValue( String literal, ValidationContext context ) {
		Object o = baseType._createValue(literal,context);
		if(o==null || !values.contains(o))		return null;
		return o;
	}
	
	protected void diagnoseByFacet(String content, ValidationContext context) throws DatatypeException {
		if( _createValue(content,context)!=null )	return;
		
		// TODO: guess which item the user was trying to specify
		
		if( values.size()<=4 ) {
			// if choices are small in number, include them into error messages.
			Object[] members = values.toArray();
			String r="";
			
			if( members[0] instanceof String
			||  members[0] instanceof Number ) {
				// this will cover 80% of the use case.
				r += "\""+members[0].toString()+"\"";
				for( int i=1; i<members.length; i++ )
					r+= "/\""+members[i].toString()+"\"";
				
				r = "("+r+")";	// oh, don't tell me I should use StringBuffer.
				
				throw new DatatypeException( DatatypeException.UNKNOWN,
					localize(ERR_ENUMERATION_WITH_ARG, r) );
			}
		}
		throw new DatatypeException( DatatypeException.UNKNOWN,
			localize(ERR_ENUMERATION) );
	}

}