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package com.sun.enterprise.deployment.node;

import java.util.Map;
import javax.persistence.PersistenceContextType;
import org.w3c.dom.Node;

import com.sun.enterprise.deployment.Descriptor;
import com.sun.enterprise.deployment.InjectionTarget;
import com.sun.enterprise.deployment.EntityManagerReferenceDescriptor;
import com.sun.enterprise.deployment.xml.EjbTagNames;
import com.sun.enterprise.deployment.xml.TagNames;

/**
 * This node handles all persistence-context-ref xml tag elements
 * 
 * @author  Shing Wai Chan
 * @version 
 */
public class EntityManagerReferenceNode extends DeploymentDescriptorNode {
    private static final String TRANSACTION = "Transaction";
    private static final String EXTENDED = "Extended";

    // Holds property name during name/value processing.
    private String propertyName = null;

    public EntityManagerReferenceNode() {
        super();
        registerElementHandler(new XMLElement(TagNames.INJECTION_TARGET), 
                                InjectionTargetNode.class, "addInjectionTarget");                          
    }

    
    /**
     * all sub-implementation of this class can use a dispatch table to map
     * xml element to method name on the descriptor class for setting
     * the element value. 
     *  
     * @return the map with the element name as a key, the setter method as
     *         a value
     */    
    protected Map getDispatchTable() {
        // no need to be synchronized for now
        Map table = super.getDispatchTable();
        table.put(TagNames.PERSISTENCE_CONTEXT_REF_NAME, "setName");
        table.put(TagNames.PERSISTENCE_UNIT_NAME, "setUnitName");        
        return table;
    }
    
    /**
     * receives notiification of the value for a particular tag
     * 
     * @param element the xml element
     * @param value it's associated value
     */    
    public void setElementValue(XMLElement element, String value) {
        if (TagNames.PERSISTENCE_CONTEXT_TYPE.equals(element.getQName())) {
            EntityManagerReferenceDescriptor entityMgrReferenceDescriptor =
                (EntityManagerReferenceDescriptor)getDescriptor();
            PersistenceContextType contextType = null;
            if (EXTENDED.equals(value)) {
                contextType = PersistenceContextType.EXTENDED;
            } else if (TRANSACTION.equals(value)) {
                contextType = PersistenceContextType.TRANSACTION;
            } else {
                throw new IllegalArgumentException(localStrings.getLocalString(
                "enterprise.deployment.node.invalidvalue",
                "Invalid value for a tag under {0} : {1}",
                new Object[] {TagNames.PERSISTENCE_CONTEXT_TYPE, value}));
            }

            entityMgrReferenceDescriptor.setPersistenceContextType(contextType);

        } else if (TagNames.NAME_VALUE_PAIR_NAME.equals(element.getQName())) {
            propertyName = value;
        } else if (TagNames.NAME_VALUE_PAIR_VALUE.equals(element.getQName())) {
            EntityManagerReferenceDescriptor entityMgrReferenceDescriptor =
                (EntityManagerReferenceDescriptor)getDescriptor();
            entityMgrReferenceDescriptor.addProperty(propertyName, value);
            propertyName = null;
        } else {
            super.setElementValue(element, value);
        }
    }    

    /**
     * write the descriptor class to a DOM tree and return it
     *
     * @param parent node in the DOM tree 
     * @param node name for the root element of this xml fragment      
     * @param the descriptor to write
     * @return the DOM tree top node
     */
    public Node writeDescriptor(Node parent, String nodeName, EntityManagerReferenceDescriptor descriptor) {    
        Node entityMgrRefNode = appendChild(parent, nodeName);
        writeLocalizedDescriptions(entityMgrRefNode, descriptor);
        
        appendTextChild(entityMgrRefNode, TagNames.PERSISTENCE_CONTEXT_REF_NAME, descriptor.getName());      
        appendTextChild(entityMgrRefNode, TagNames.PERSISTENCE_UNIT_NAME, descriptor.getUnitName());      
        PersistenceContextType contextType = descriptor.getPersistenceContextType();
        String contextTypeString = (contextType != null &&
            PersistenceContextType.EXTENDED.equals(contextType)) ?
            EXTENDED : TRANSACTION;
        appendTextChild(entityMgrRefNode, TagNames.PERSISTENCE_CONTEXT_TYPE,
            contextTypeString);

        for(Map.Entry<String, String> property : 
                descriptor.getProperties().entrySet()) {
            Node propertyNode = appendChild(entityMgrRefNode, 
                                            TagNames.PERSISTENCE_PROPERTY);
            appendTextChild(propertyNode, TagNames.NAME_VALUE_PAIR_NAME,
                            property.getKey());
            appendTextChild(propertyNode, TagNames.NAME_VALUE_PAIR_VALUE,
                            property.getValue());
        }

        if( descriptor.isInjectable() ) {
            InjectionTargetNode ijNode = new InjectionTargetNode();
            for (InjectionTarget target : descriptor.getInjectionTargets()) {
                ijNode.writeDescriptor(entityMgrRefNode, TagNames.INJECTION_TARGET, target);
            }
        }
            
        return entityMgrRefNode;
    }
}