/*
Copyright 2008-2010 Gephi
Authors : Mathieu Bastian <mathieu.bastian@gephi.org>
Website : http://www.gephi.org
This file is part of Gephi.
DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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*/
package org.gephi.ranking.api;
/**
* Transformers role is to transform nodes/edges numerical attributes
* to visual signs (e.g. color or sizes). It uses a normalized real number
* between zero and one to output a meaningful value.
* <p>
* Transformers can be applied to a subset of values using lower/bound filter
* values.
* <p>
* Default transformers implemented in the RankingPlugin:
* <ul><li><b>RENDERABLE_COLOR:</b> Sets node/edge color</li>
* <li><b>RENDERABLE_SIZE:</b> Sets node/edge size. For edges, the size is the weight.</li>
* <li><b>LABEL_COLOR:</b> Sets label color.</li>
* <li><b>LABEL_SIZE:</b> Sets label size. Note this is a multiplier.</li>
*
* @see Ranking
* @author Mathieu Bastian
*/
public interface Transformer<Target> {
public static final String RENDERABLE_COLOR = "renderable_color";
public static final String RENDERABLE_SIZE = "renderable_size";
public static final String LABEL_COLOR = "label_color";
public static final String LABEL_SIZE = "label_size";
/**
* Sets the lower filter bound. Values lower than this value won't be
* transformed. By default the bound is set to zero, so no filtering.
* @param lowerBound the lower bound filter value
*/
public void setLowerBound(float lowerBound);
/**
* Sets the upper filter bound. Values upper than this value won't be
* transformed. By default the bound is set to one, so no filtering.
* @param upperBound the upper bound filter value
*/
public void setUpperBound(float upperBound);
/**
* Returns the lower bound filter value. By default it's set to zero, so
* filtering is disabled.
* @return the lower bound filter value
*/
public float getLowerBound();
/**
* Returns the upper bound filter value. By default it's set to one, so
* filtering is disabled.
* @return the upper bound filter value
*/
public float getUpperBound();
/**
* Returns <code>true</code> if <code>value</code> is within the lower and
* the upper bound. Typically, this is called before <code>transform()</code>
* to know if a value can be processed. By default, this always returns <code>
* true</code>, as lower bound is set ot zero and upper bound to one.
* @param value the value to test if in bounds
* @return <code>true</code> if value superior or equal to lowerBound and
* value inferior or equal to upperBound, <code>false</code> otherwise
*
*/
public boolean isInBounds(float value);
/**
* Transforms <code>target</code> with <code>normalizedValue</code> between
* zero and one. The method also returns the transformed value, like the color
* for instance for a color transformer.
* @param target the object to transform
* @param normalizedValue the ranking normalized value
* @return the transformed value, or <code>null</code>
*/
public Object transform(Target target, float normalizedValue);
}