QnameType.java

/*
 * @(#)$Id: QnameType.java,v 1.29 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;

/**
 * "QName" type.
 * 
 * type of the value object is {@link QnameValueType}.
 * See http://www.w3.org/TR/xmlschema-2/#QName for the spec.
 * 
 * @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
 */
public class QnameType extends BuiltinAtomicType implements Discrete {
	public static final QnameType theInstance = new QnameType();
	private QnameType() { super("QName"); }
	
	final public XSDatatype getBaseType() {
		return SimpleURType.theInstance;
	}
	
	/**
	 * QName type always returns true. That is, QName is a context-dependent type.
	 */
	public boolean isContextDependent() {
		return true;
	}

	private static String getNamespaceURI( String content, ValidationContext context ) {
		return context.resolveNamespacePrefix( content.substring(0, content.indexOf(':')) );
	}
	
	protected boolean checkFormat( String value, ValidationContext context ) {
		// [6] QName ::= (Prefix ':')? LocalPart
		// [7] Prefix ::= NCName
		// [8] LocalPart ::= NCName

		final int first = value.indexOf(':');

		// no Prefix, only check LocalPart
		if(first <= 0)		return XmlNames.isUnqualifiedName(value);

		// Prefix exists, check everything
		final int	last = value.lastIndexOf(':');
		if (last != first)	return false;

		final String prefix = value.substring (0, first);
		return XmlNames.isUnqualifiedName(prefix)
			&& XmlNames.isUnqualifiedName(value.substring (first + 1))
			&& context.resolveNamespacePrefix(prefix)!=null;
	}
	
	public Object _createValue( String value, ValidationContext context ) {
		String uri,localPart;
		// [6] QName ::= (Prefix ':')? LocalPart
		// [7] Prefix ::= NCName
		// [8] LocalPart ::= NCName

		final int first = value.indexOf(':');

		if(first <= 0)
		{// no Prefix, only check LocalPart
			if(!XmlNames.isUnqualifiedName(value))	return null;
			uri = context.resolveNamespacePrefix("");
			localPart = value;
		} else {
			// Prefix exists, check everything
			final int	last = value.lastIndexOf (':');
			if (last != first)	return null;
			
			final String prefix = value.substring(0, first);
			localPart = value.substring(first + 1);
			
			if(!XmlNames.isUnqualifiedName(prefix)
			|| !XmlNames.isUnqualifiedName(localPart) )
				return null;
			
			uri = context.resolveNamespacePrefix(prefix);
		}
		
		if(uri==null)	return null;
		
		return new QnameValueType(uri,localPart);
	}
	
	public final int isFacetApplicable( String facetName ) {
		if( facetName.equals(FACET_PATTERN)
		||	facetName.equals(FACET_ENUMERATION)
        ||  facetName.equals(FACET_WHITESPACE)
		||	facetName.equals(FACET_LENGTH)
		||	facetName.equals(FACET_MAXLENGTH)
		||	facetName.equals(FACET_MINLENGTH)
		)
			return APPLICABLE;
		else
			return NOT_ALLOWED;
	}
	
	public final int countLength( Object value ) {
		QnameValueType v = (QnameValueType)value;
		
		// the spec does not define what is the unit of length.
		// TODO: check the update of the spec and modify this if necessary.
		return	UnicodeUtil.countLength( v.namespaceURI )+
				UnicodeUtil.countLength( v.localPart );
	}

	
	public String convertToLexicalValue( Object o, SerializationContext context ) {
		if(!( o instanceof QnameValueType ))
			throw new UnsupportedOperationException();
		
		QnameValueType v = (QnameValueType)o;
		
		return serialize(v.namespaceURI,v.localPart,context);
	}

	public String serializeJavaObject( Object value, SerializationContext context ) {
		if(!(value instanceof String[]))	throw new IllegalArgumentException();
		String[] input = (String[])value;
		if( input.length!=2 )				throw new IllegalArgumentException();
		
		return serialize(input[0],input[1],context);
	}
	
	private String serialize( String uri, String local, SerializationContext context ) {
		String prefix = context.getNamespacePrefix(uri);
		if(prefix==null)	return local;
		else				return prefix+":"+local;
	}
	
	public Object _createJavaObject( String literal, ValidationContext context ) {
		QnameValueType v = (QnameValueType)createValue(literal,context);
		if(v==null)		return null;
		// return String[2]
		else			return new String[]{v.namespaceURI,v.localPart};
	}

	public Class getJavaObjectType() {
		return String[].class;
	}
}