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package oracle.toplink.essentials.internal.ejb.cmp3.xml.columns;

import org.w3c.dom.Node;

import oracle.toplink.essentials.internal.ejb.cmp3.xml.XMLHelper;
import oracle.toplink.essentials.internal.ejb.cmp3.xml.XMLConstants;

import oracle.toplink.essentials.internal.ejb.cmp3.metadata.columns.MetadataDiscriminatorColumn;

/**
 * Object to hold onto an xml discriminator column metadata.
 * 
 * @author Guy Pelletier
 * @since TopLink EJB 3.0 Reference Implementation
 */
public class XMLDiscriminatorColumn extends MetadataDiscriminatorColumn {
    protected Node m_node;
    protected XMLHelper m_helper;
    
    /**
     * INTERNAL:
     */
    public XMLDiscriminatorColumn(Node node, XMLHelper helper) {
        m_node = node;
        m_helper = helper;
    }
    
    /**
     * INTERNAL:
     */
    public String getColumnDefinition() {
        return m_helper.getNodeValue(m_node, XMLConstants.ATT_COLUMN_DEFINITION, DEFAULT_COLUMN_DEFINITION);
    }
    
    /**
     * INTERNAL:
     */
    public String getDiscriminatorType() {
        return m_helper.getNodeValue(m_node, XMLConstants.ATT_DISCRIMINATOR_TYPE, DEFAULT_DISCRIMINATOR_TYPE);
    }
    
    /**
     * INTERNAL:
     */
    public int getLength() {
        return m_helper.getNodeValue(m_node, XMLConstants.ATT_LENGTH, DEFAULT_LENGTH);
    }
    
    /**
     * INTERNAL:
     */
    public String getName() {
        return m_helper.getNodeValue(m_node, XMLConstants.ATT_NAME);
    }
}
