package org.geotools.styling.builder;

import org.geotools.Builder;
import org.geotools.factory.CommonFactoryFinder;
import org.geotools.styling.Extent;
import org.geotools.styling.StyleFactory;

/**
 * 
 *
 * @source $URL$
 */
public class ExtentBuilder<P> implements Builder<Extent> {
    private StyleFactory sf = CommonFactoryFinder.getStyleFactory(null);

    private P parent;

    boolean unset = true; // current value is null

    private String name;

    private String value;

    public ExtentBuilder() {
        this(null);
    }

    public ExtentBuilder(P parent) {
        this.parent = parent;
        reset();
    }

    public Extent build() {
        if (unset) {
            return null;
        }
        Extent extent = sf.createExtent(name, value);
        return extent;
    }

    public P end() {
        return parent;
    }

    public ExtentBuilder<P> reset() {
        this.name = null;
        this.value = null;
        unset = false;
        return this;
    }

    public ExtentBuilder<P> reset(Extent extent) {
        if (extent == null) {
            return reset();
        }
        this.value = extent.getValue();
        this.name = extent.getName();
        unset = false;
        return this;
    }

    public ExtentBuilder<P> unset() {
        this.name = null;
        this.value = null;
        unset = true;
        return this;
    }

}