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* Licensed Materials - Property of IBM
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*
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*******************************************************************************/

package org.eclipse.epf.authoring.ui.properties;

import java.util.List;

import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.epf.library.edit.util.DescriptorPropUtil;
import org.eclipse.epf.library.edit.util.LibraryEditUtil;
import org.eclipse.epf.library.edit.util.ProcessUtil;
import org.eclipse.epf.uma.Descriptor;
import org.eclipse.epf.uma.MethodElement;
import org.eclipse.epf.uma.TaskDescriptor;

/**
 * 
 * @author achen
 *
 */
public class MoveDescriptorCommand extends RemoveDescriptorCommand {
	private Descriptor desc;
	private List items;
	private List methodElements;
	private int toFeature;
	private DescriptorPropUtil propUtil = DescriptorPropUtil.getDesciptorPropUtil();
	
	public MoveDescriptorCommand(Descriptor desc, List items, int fromFeature, int toFeature) {
		super(desc, items, fromFeature, false);
		
		this.desc = desc;
		this.items = items;
		methodElements = ProcessUtil.getAssociatedElementList(items);
		this.toFeature = toFeature;
	}
	
	public void execute() {
		redo();
	}

	public void redo() {
		super.redo();		
		EStructuralFeature feature = desc.eClass().getEStructuralFeature(toFeature);		
		Object value = desc.eGet(feature);
		if (value instanceof List) {
			List listValue = (List) value;
			listValue.addAll(methodElements);
		}
		
		Descriptor parent = propUtil.getGreenParentDescriptor(desc);
		if ((parent != null) && (parent instanceof TaskDescriptor)) {
			TaskDescriptor greenParent = (TaskDescriptor)parent;
			EReference ref = (EReference) greenParent.eClass().getEStructuralFeature(getFeatureID());
			EReference eRef = LibraryEditUtil.getInstance().getExcludeFeature(ref);
			List<MethodElement> parentExecludeList = (List<MethodElement>) greenParent.eGet(eRef);
			for (MethodElement elem : (List<MethodElement>) methodElements) {
				propUtil.removeGreenRefDelta(desc, elem, eRef, false);
				if (parentExecludeList != null && ! parentExecludeList.contains(elem)) {
					propUtil.addGreenRefDelta(desc, elem, eRef, true);
				}				
			}
		}
	}
	
	public void undo() {
		super.undo();		
		EStructuralFeature feature = desc.eClass().getEStructuralFeature(toFeature);		
		Object value = desc.eGet(feature);
		if (value instanceof List) {
			List listValue = (List) value;
			listValue.removeAll(methodElements);
		}
		
		Descriptor parent = propUtil.getGreenParentDescriptor(desc);
		if ((parent != null) && (parent instanceof TaskDescriptor)) {
			TaskDescriptor greenParent = (TaskDescriptor)parent;
			EReference ref = (EReference) greenParent.eClass().getEStructuralFeature(getFeatureID());
			EReference eRef = LibraryEditUtil.getInstance().getExcludeFeature(ref);
			List<MethodElement> parentExecludeList = (List<MethodElement>) greenParent.eGet(eRef);
			for (MethodElement elem : (List<MethodElement>) methodElements) {
				propUtil.addGreenRefDelta(desc, elem, eRef, false);
				if (parentExecludeList != null && ! parentExecludeList.contains(elem)) {
					propUtil.removeGreenRefDelta(desc, elem, eRef, true);
				}				
			}
		}
	}

}