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// RelativeValueProvider.java
package org.eclipse.stem.definitions.adapters.relativevalue;
/*******************************************************************************
* Copyright (c) 2006 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
import java.util.List;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.edit.provider.IItemPropertyDescriptor;
import org.eclipse.emf.edit.provider.ItemPropertyDescriptor;
/**
* This interface is implemented by classes that have properties and can map the
* value of the property to a value between 0.0 (zero) and 1.0 (one), inclusive.
*/
public interface RelativeValueProvider {
/**
* @return the properties of the provider
*/
List<IItemPropertyDescriptor> getProperties();
/**
* Determine the relative (0.0 to 1.0) value of the property as compared to
* the other properties.
*
* @param property
* the property whose relative value is to be determined
* @return relative (0.0-1.0) value of the property as compared to the other
* properties.
*/
double getRelativeValue(final ItemPropertyDescriptor property);
/**
* Determine the relative (0.0 to 1.0) value of the property as compared to
* the other properties.
*
* @param feature
* feature of the property whose relative value is to be
* determined
* @return relative (0.0-1.0) value of the property as compared to the other
* properties.
*/
double getRelativeValue(final EStructuralFeature feature);
/**
* This method returns the denominator or scale used to convert to relative
* values in the range 0-1. For example, in an Epidemic Compartment model
* the state values are normalized by population.
* It is required whenever we need to switch between relative and absolute values
* or can be used to create a label showing the maximum scale for any relative value.
* @return the denominator or scale used to normalize the relative value
*/
double getDenominator(final EStructuralFeature feature) ;
}// RelativeValueProvider
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