tools.vitruv.change.testutils.changevisualization.tree.decoder.echange.ReplaceChangeDecoder Maven / Gradle / Ivy

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Utilities for visualization changes on models

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package tools.vitruv.change.testutils.changevisualization.tree.decoder.echange;

import java.util.Map;

import tools.vitruv.change.atomic.EChange;

/**
 * Decoder for changes with a replace semantic
 * 
 * @author Andreas Loeffler
 */
public class ReplaceChangeDecoder extends AbstractChangeDecoder{
	
	/*
	 * The maximum length of value-Strings to display
	 */
	protected static final int MAX_LENGTH=40;

	/**
	 * Constructs a decoder for a given eChange class.
	 * This class has to use oldValue and newValue as the structural features holding the respective values
	 * 
	 * @param eClassName The eclassName
	 */
	public ReplaceChangeDecoder(String eClassName) {
		super(eClassName,new String[] {"oldValue","newValue","affectedFeature","affectedEObject"});
	}
	
	@Override
	protected String generateString(EChange eChange, Map structuralFeatures2values) {
		//At least oldValue or new Value must exist
		if(!structuralFeatures2values.containsKey("oldValue")&&!structuralFeatures2values.containsKey("newValue")) {
			return null;
		}

		//affectedFeature and affectedEObject both must exist
		if(!structuralFeatures2values.containsKey("affectedFeature")||!structuralFeatures2values.containsKey("affectedEObject")) {
			return null;
		}

		//Extract old/newValue		
		String oldValue=structuralFeatures2values.containsKey("oldValue")?structuralFeatures2values.get("oldValue").toString():"-";
		String newValue=structuralFeatures2values.containsKey("newValue")?structuralFeatures2values.get("newValue").toString():"-";
		
		if(oldValue.length()>MAX_LENGTH) {
			oldValue=oldValue.substring(0,MAX_LENGTH)+"...";
		}
		if(newValue.length()>MAX_LENGTH) {
			newValue=newValue.substring(0,MAX_LENGTH)+"...";
		}

		//Extract the entityName of the eObject
		String eObjectName=extractAffectedEObjectName(structuralFeatures2values);
		if(eObjectName==null) {
			eObjectName=NULL_STRING;
		}		

		//extract the name of the eAttribute
		String eAttributeName=extractAffectedFeatureName(structuralFeatures2values);		
		if(eAttributeName==null) {
			eAttributeName=NULL_STRING;
		}

		//Create the result string
		return "\""+eObjectName+"\" / \""+eAttributeName+"\" : \""+oldValue+"\" ==> \""+newValue+"\"";
	}	

}