/*
* @(#)$Id: DataState.java 1566 2003-06-09 20:37:49Z kk122374 $
*
* 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.trex.ng;
import org.relaxng.datatype.DatatypeBuilder;
import org.relaxng.datatype.DatatypeException;
import com.sun.msv.datatype.ErrorDatatypeLibrary;
import com.sun.msv.grammar.Expression;
import com.sun.msv.reader.ExpressionOwner;
import com.sun.msv.reader.ExpressionState;
import com.sun.msv.reader.State;
import com.sun.msv.util.StartTagInfo;
import com.sun.msv.util.StringPair;
/**
* parses <data> pattern.
*
* @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
*/
public class DataState extends ExpressionState implements ExpressionOwner {
protected State createChildState( StartTagInfo tag ) {
final RELAXNGReader reader = (RELAXNGReader)this.reader;
if( tag.localName.equals("except") )
return reader.getStateFactory().dataExcept(this,tag);
if( tag.localName.equals("param") )
return reader.getStateFactory().dataParam(this,tag);
return null;
}
/** type incubator object to be used to create a type. */
protected DatatypeBuilder typeBuilder;
/** the name of the base type. */
protected StringPair baseTypeName;
protected void startSelf() {
final RELAXNGReader reader = (RELAXNGReader)this.reader;
super.startSelf();
final String localName = startTag.getCollapsedAttribute("type");
if( localName==null ) {
reader.reportError( RELAXNGReader.ERR_MISSING_ATTRIBUTE, "data", "type" );
} else {
// create a type incubator
baseTypeName = new StringPair( reader.datatypeLibURI, localName );
try {
typeBuilder = reader.getCurrentDatatypeLibrary().createDatatypeBuilder(localName);
} catch( DatatypeException dte ) {
reader.reportError( RELAXNGReader.ERR_UNDEFINED_DATATYPE_1, localName, dte.getMessage() );
}
}
if( typeBuilder==null ) {
// if an error is encountered, then typeIncubator field is left null.
// In that case, set a dummy implementation so that the successive param
// statements are happy.
typeBuilder = ErrorDatatypeLibrary.theInstance;
}
}
/** the 'except' clause. Null if nothing was specified */
protected Expression except = null;
public void onEndChild( Expression child ) {
final RELAXNGReader reader = (RELAXNGReader)this.reader;
// this method receives the 'except' clause, if any.
if( except!=null )
reader.reportError( RELAXNGReader.ERR_MULTIPLE_EXCEPT );
except = child;
}
protected Expression makeExpression() {
final RELAXNGReader reader = (RELAXNGReader)this.reader;
try {
if( except==null ) except=Expression.nullSet;
return reader.pool.createData(
typeBuilder.createDatatype(), baseTypeName, except );
} catch( DatatypeException dte ) {
reader.reportError( RELAXNGReader.ERR_INVALID_PARAMETERS, dte.getMessage() );
// recover by returning something.
return Expression.nullSet;
}
}
}