/*
* @(#)$Id: AttributeState.java,v 1.22 2002/10/06 18:07:06 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.reader.xmlschema;
import com.sun.msv.datatype.xsd.XSDatatype;
import com.sun.msv.grammar.Expression;
import com.sun.msv.grammar.ReferenceContainer;
import com.sun.msv.grammar.AttributeExp;
import com.sun.msv.grammar.SimpleNameClass;
import com.sun.msv.grammar.xmlschema.AttributeDeclExp;
import com.sun.msv.grammar.xmlschema.XMLSchemaSchema;
import com.sun.msv.grammar.relax.NoneType;
import com.sun.msv.util.StartTagInfo;
import com.sun.msv.util.StringPair;
import com.sun.msv.reader.State;
import com.sun.msv.reader.ExpressionWithChildState;
import com.sun.msv.reader.datatype.TypeOwner;
import com.sun.msv.reader.datatype.xsd.XSDatatypeExp;
import com.sun.msv.reader.datatype.xsd.XSTypeIncubator;
import com.sun.msv.reader.datatype.xsd.XSTypeOwner;
import org.xml.sax.Locator;
import org.relaxng.datatype.DatatypeException;
/**
* used to parse <attribute > element.
*
* @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
*/
public class AttributeState extends ExpressionWithChildState implements XSTypeOwner {
protected State createChildState( StartTagInfo tag ) {
if( tag.localName.equals("simpleType") )
return ((XMLSchemaReader)reader).sfactory.simpleType(this,tag);
return super.createChildState(tag);
}
protected Expression initialExpression() {
final XMLSchemaReader reader = (XMLSchemaReader)this.reader;
if( startTag.containsAttribute("ref") ) {
if( isGlobal() ) {
reader.reportError( reader.ERR_DISALLOWED_ATTRIBUTE,
startTag.qName, "ref" );
return Expression.epsilon;
}
// this tag has @ref.
Expression exp = reader.resolveQNameRef(
startTag, "ref",
new XMLSchemaReader.RefResolver() {
public ReferenceContainer get( XMLSchemaSchema g ) {
return g.attributeDecls;
}
} );
if( exp==null ) return Expression.epsilon; // couldn't resolve QName.
return exp;
}
final String typeAttr = startTag.getAttribute("type");
if( typeAttr==null )
// return null to indicate that no type definition is given.
return null;
// if <attribute> element has @type, then
// it shall be used as content type.
return reader.resolveXSDatatype( typeAttr );
}
protected Expression defaultExpression() {
// if no type definition is given, assume ur-type.
return Expression.anyString;
}
protected Expression castExpression( Expression halfCastedExpression, Expression newChildExpression ) {
if( halfCastedExpression!=null )
// only one child is allowed.
// recover by ignoring previously found child expressions.
reader.reportError( reader.ERR_MORE_THAN_ONE_CHILD_EXPRESSION );
return newChildExpression;
}
protected Expression annealExpression(Expression contentType) {
final XMLSchemaReader reader = (XMLSchemaReader)this.reader;
final String fixed = startTag.getAttribute("fixed");
final String name = startTag.getAttribute("name");
final String use = startTag.getAttribute("use");
Expression exp;
if( startTag.containsAttribute("ref") ) {
if( fixed!=null )
reader.reportWarning( reader.ERR_UNIMPLEMENTED_FEATURE,
"<attribute> element with both 'ref' and 'fixed' attributes" );
exp = contentType;
} else {
// TODO: form attribute is prohibited in several occasions.
String targetNamespace;
// @name is mandatory
if( name==null ) {
reader.reportError( reader.ERR_MISSING_ATTRIBUTE,
"attribute","name");
return Expression.nullSet;
}
if( isGlobal() ) targetNamespace = reader.currentSchema.targetNamespace;
else
// in local attribute declaration,
// targetNamespace is affected by @form and schema's @attributeFormDefault.
targetNamespace = reader.resolveNamespaceOfAttributeDecl(
startTag.getAttribute("form") );
if( fixed!=null ) {
if(contentType instanceof XSDatatypeExp ) {
// we know that the attribute value is of XSDatatypeExp
final XSDatatypeExp baseType = (XSDatatypeExp)contentType;
try {
XSTypeIncubator inc = baseType.createIncubator();
inc.addFacet("enumeration",fixed,reader);
contentType = inc.derive(null,null);
} catch( DatatypeException e ) {
reader.reportError( e, reader.ERR_BAD_TYPE, e.getMessage() );
return Expression.nullSet;
}
} else {
// this is strange, as the type of the attribute
// must be a simple type in theory.
// but I'm not sure if we receive XSDatatypeExp as
// the content type --- it maybe some ReferenceExp,
// for example. So just degrade and assume token here.
// I know this is a sloppy work
contentType = reader.pool.createValue(
com.sun.msv.datatype.xsd.TokenType.theInstance,
new StringPair("","token"), // emulate RELAX NG built-in "token" type
fixed );
}
}
if( "prohibited".equals(use) )
// use='prohibited' is implemented through NoneType
contentType = reader.pool.createData( NoneType.theInstance );
exp = reader.pool.createAttribute(
new SimpleNameClass( targetNamespace, name ),
contentType );
}
if( isGlobal() ) {
// register this expression as a global attribtue declaration.
AttributeDeclExp decl = reader.currentSchema.attributeDecls.getOrCreate(name);
if(decl.exp!=null)
reader.reportError(
new Locator[]{this.location,reader.getDeclaredLocationOf(decl)},
reader.ERR_DUPLICATE_ATTRIBUTE_DEFINITION,
new Object[]{name} );
reader.setDeclaredLocationOf(decl);
if( exp instanceof AttributeExp )
decl.set( (AttributeExp)exp );
else {
// sometimes, because of the error recovery,
// exp can be something other than an AttributeExp.
if( !reader.controller.hadError() ) throw new Error();
}
// TODO: @use is prohibited in global
} else {
// handle @use
if( "optional".equals(use) || use==null || "prohibited".equals(use) )
exp = reader.pool.createOptional(exp);
else
if( !"required".equals(use) )
reader.reportError( reader.ERR_BAD_ATTRIBUTE_VALUE, "use", use );
// recover by assuming "required" (i.e., do nothing)
}
return exp;
}
public String getTargetNamespaceUri() {
final XMLSchemaReader reader = (XMLSchemaReader)this.reader;
return reader.currentSchema.targetNamespace;
}
public void onEndChild( XSDatatypeExp type ) {
super.onEndChild(type);
}
protected boolean isGlobal() {
return parentState instanceof GlobalDeclState;
}
}