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The main module contains the GeoTools public interfaces that are used by other GeoTools modules (and GeoTools applications). Where possible we make use industry standard terms as provided by OGC and ISO standards. The formal GeoTools public api consists of gt-metadata, jts and the gt-main module. The main module contains the default implementations that are available provided to other GeoTools modules using our factory system. Factories are obtained from an appropriate FactoryFinder, giving applications a chance configure the factory used using the Factory Hints facilities. FilterFactory ff = CommonFactoryFinder.getFilterFactory(); Expression expr = ff.add( expression1, expression2 ); If you find yourself using implementation specific classes chances are you doing it wrong: Expression expr = new AddImpl( expression1, expressiom2 );

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/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 */
package org.geotools.styling;

// J2SE dependencies
// import java.util.logging.Logger;
// OpenGIS dependencies

import java.util.ArrayList;
import java.util.List;
import org.geotools.util.Utilities;
import org.opengis.filter.FilterFactory;
import org.opengis.filter.expression.Expression;
import org.opengis.style.StyleVisitor;
import org.opengis.util.Cloneable;

/**
 * Provides a Java representation of the Font element of an SLD.
 *
 * @author Ian Turton, CCG
 * @version $Id$
 */
public class FontImpl implements Font, Cloneable {
    /** The logger for the default core module. */

    // private static final Logger LOGGER =
    // org.geotools.util.logging.Logging.getLogger(FontImpl.class);
    private final List fontFamily = new ArrayList();

    private Expression fontSize = null;
    private Expression fontStyle = null;
    private Expression fontWeight = null;

    /** Creates a new instance of DefaultFont */
    protected FontImpl() {}

    public List getFamily() {
        return fontFamily;
    }

    public Expression getSize() {
        return fontSize;
    }

    public void setSize(Expression size) {
        this.fontSize = size;
    }

    public Expression getStyle() {
        return fontStyle;
    }

    public void setStyle(Expression style) {
        fontStyle = style;
    }

    public Expression getWeight() {
        return fontWeight;
    }

    public void setWeight(Expression weight) {
        fontWeight = weight;
    }

    /**
     * Creates a clone of the font.
     *
     * @see Cloneable#clone()
     */
    public Object clone() {
        try {
            // all the members are immutable expression
            // super.clone() is enough.
            return super.clone();
        } catch (CloneNotSupportedException e) {
            throw new RuntimeException("This should not happen", e);
        }
    }

    /**
     * Generates the hashcode for the font.
     *
     * @return the hash code.
     */
    public int hashCode() {
        final int PRIME = 1000003;
        int result = 0;

        if (fontFamily != null) {
            result = (PRIME * result) + fontFamily.hashCode();
        }

        if (fontSize != null) {
            result = (PRIME * result) + fontSize.hashCode();
        }

        if (fontStyle != null) {
            result = (PRIME * result) + fontStyle.hashCode();
        }

        if (fontWeight != null) {
            result = (PRIME * result) + fontWeight.hashCode();
        }

        return result;
    }

    /**
     * Compares this font with another for equality. Two fonts are equal if their family, style,
     * weight and size are equal.
     *
     * @return True if this and oth are equal.
     */
    public boolean equals(Object oth) {
        if (this == oth) {
            return true;
        }

        if (oth == null) {
            return false;
        }

        if (oth instanceof FontImpl) {
            FontImpl other = (FontImpl) oth;

            return Utilities.equals(this.fontFamily, other.fontFamily)
                    && Utilities.equals(this.fontSize, other.fontSize)
                    && Utilities.equals(this.fontStyle, other.fontStyle)
                    && Utilities.equals(this.fontWeight, other.fontWeight);
        }

        return false;
    }

    /** Utility method to capture the default font in one place. */
    static Font createDefault(FilterFactory filterFactory) {
        Font font = new FontImpl();
        try {
            font.setSize(filterFactory.literal(Integer.valueOf(10)));
            font.setStyle(filterFactory.literal("normal"));
            font.setWeight(filterFactory.literal("normal"));
            font.getFamily().add(filterFactory.literal("Serif"));
        } catch (org.geotools.filter.IllegalFilterException ife) {
            throw new RuntimeException("Error creating default", ife);
        }
        return font;
    }

    public Object accept(StyleVisitor visitor, Object data) {
        return visitor.visit(this, data);
    }

    static FontImpl cast(org.opengis.style.Font font) {
        if (font == null) {
            return null;
        } else if (font instanceof FontImpl) {
            return (FontImpl) font;
        } else {
            FontImpl copy = new FontImpl();
            copy.getFamily().addAll(font.getFamily());
            copy.setSize(font.getSize());
            copy.setStyle(font.getStyle());
            copy.setWeight(font.getWeight());
            return copy;
        }
    }
}