org.gephi.layout.spi.LayoutBuilder Maven / Gradle / Ivy
/*
Copyright 2008-2010 Gephi
Authors : Helder Suzuki
Website : http://www.gephi.org
This file is part of Gephi.
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*/
package org.gephi.layout.spi;
/**
* A LayoutBuilder provides a specific {@link Layout} instance. The
* Builder pattern is more suitable for the Layout instantiation to allow
* simpler reusability of Layout's code.
*
* Only the LayoutBuilder of a given layout algorithm is exposed,
* this way, one can devise different layout algorithms (represented by their
* respective LayoutBuilder) that uses a same underlying Layout implementation,
* but that differs only by an aggregation, composition or a property that is
* set only during instantiation time.
*
* See ClockwiseRotate and CounterClockwiseRotate for
* a simple example of this pattern. Both are LayoutBuilders that instanciate
* Layouts with a different behaviour (the direction of rotation), but both uses
* the RotateLayout class. The only difference is the angle provided by the
* LayoutBuilder on the time of instantiation of the RotateLayout object.
*
* @author Helder Suzuki
*/
public interface LayoutBuilder {
/**
* The name of the behaviour of the Layout's provided by this Builder.
* @return the display neame of the layout algorithm
*/
public String getName();
/**
* User interface attributes (name, description, icon...) for all Layouts
* built by this builder.
* @return a LayoutUI instance
*/
public LayoutUI getUI();
/**
* Builds an instance of the Layout.
* @return a new Layout instance
*/
public Layout buildLayout();
}