/*
 * @(#)$Id: IntegerDerivedType.java,v 1.22 2002/10/08 22:01:27 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 org.relaxng.datatype.ValidationContext;
import com.sun.msv.datatype.SerializationContext;

/**
 * base class for types derived from integer.
 * 
 * @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
 */
abstract class IntegerDerivedType extends BuiltinAtomicType implements Comparator {
	
	protected IntegerDerivedType( String typeName ) {
		super(typeName);
	}
	
	public final int isFacetApplicable( String facetName ) {
		// TODO : should we allow scale facet, or not?
		if( facetName.equals(FACET_TOTALDIGITS)
		||	facetName.equals(FACET_PATTERN)
        ||  facetName.equals(FACET_WHITESPACE)
		||	facetName.equals(FACET_ENUMERATION)
		||	facetName.equals(FACET_MAXINCLUSIVE)
		||	facetName.equals(FACET_MININCLUSIVE)
		||	facetName.equals(FACET_MAXEXCLUSIVE)
		||	facetName.equals(FACET_MINEXCLUSIVE) )
			return APPLICABLE;
		else
			return NOT_ALLOWED;
	}
	
	protected final boolean checkFormat( String content, ValidationContext context ) {
		// integer-derived types always checks lexical format by trying to convert it to value object
		return _createValue(content,context)!=null;
	}
	
	public String convertToLexicalValue( Object value, SerializationContext context ) {
		if( value instanceof Number || value instanceof IntegerValueType )
			return value.toString();
		else
			throw new IllegalArgumentException("invalid value type:"+value.getClass().toString());
	}
	
	public final int compare( Object o1, Object o2 ) {
		// integer-derived type always uses Comparable object as its value type
		final int r = ((Comparable)o1).compareTo(o2);
		if(r<0)	return LESS;
		if(r>0)	return GREATER;
		return EQUAL;
	}

	/**
	 * removes leading optional '+' sign.
	 * 
	 * Several Java conversion functions (e.g., Long.parseLong)
	 * do not accept leading '+' sign.
	 */
	protected static String removeOptionalPlus(String s) {
		if(s.length()<=1 || s.charAt(0)!='+')	return s;
		
		s = s.substring(1);
		char ch = s.charAt(0);
		if('0'<=ch && ch<='9')	return s;
		if('.'==ch )	return s;
		
		throw new NumberFormatException();
	}
}