package org.jbpm.compiler.xml.processes;

import java.util.HashSet;

import org.drools.core.process.core.datatype.DataType;
import org.drools.core.xml.BaseAbstractHandler;
import org.drools.core.xml.ExtensibleXmlParser;
import org.drools.core.xml.Handler;
import org.jbpm.process.core.ValueObject;
import org.w3c.dom.Element;
import org.w3c.dom.Text;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

public class ValueHandler extends BaseAbstractHandler implements Handler {
	
    public ValueHandler() {
        if ( (this.validParents == null) && (this.validPeers == null) ) {
            this.validParents = new HashSet<Class<?>>();
            this.validParents.add( ValueObject.class );

            this.validPeers = new HashSet<Class<?>>();         
            this.validPeers.add( null );            

            this.allowNesting = false;
        }
    }
    

    
    public Object start(final String uri,
                        final String localName,
                        final Attributes attrs,
                        final ExtensibleXmlParser parser) throws SAXException {
        parser.startElementBuilder( localName,
                                    attrs );
        return null;
    }    
    
    public Object end(final String uri,
                      final String localName,
                      final ExtensibleXmlParser parser) throws SAXException {
        final Element element = parser.endElementBuilder();
        ValueObject valueObject = (ValueObject) parser.getParent();
        String text = ((Text)element.getChildNodes().item( 0 )).getWholeText();
        if (text != null) {
            text.trim();
            if ("".equals(text)) {
                text = null;
            }
        }
        Object value = restoreValue(text, valueObject.getType(), parser);
        valueObject.setValue(value);
        return null;
    }
    
    private Object restoreValue(String text, DataType dataType, ExtensibleXmlParser parser) throws SAXException {
        if (text == null || "".equals(text)) {
            return null;
        }
        if (dataType == null) {
            throw new SAXParseException(
                "Null datatype", parser.getLocator());
        }
        return dataType.readValue(text);
    }

    public Class<?> generateNodeFor() {
        return null;
    }

}
