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Standard interfaces implemented throughout the library.

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/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2011, Open Source Geospatial Foundation (OSGeo)
 *    (C) 2008, Open Geospatial Consortium Inc.
 *
 *    All Rights Reserved. http://www.opengis.org/legal/
 */
package org.opengis.style;

import javax.swing.Icon;
import org.opengis.annotation.Extension;
import org.opengis.annotation.XmlElement;
import org.opengis.metadata.citation.OnLineResource;

/**
 * The alternative to a WellKnownName is an external mark format. The MarkIndex allows an individual
 * mark in a mark archive to be selected. An example format for an external mark archive would be a
 * TrueType font file, with MarkIndex being used to select an individual glyph from that file.
 *
 * @version Symbology Encoding
 *     Implementation Specification 1.1.0
 * @author Open Geospatial Consortium
 * @author Johann Sorel (Geomatys)
 * @since GeoAPI 2.2
 */
public interface ExternalMark {

    /**
     * Returns on online resource defined by an URI.
     *
     * Both OnlineResource and InlineContent can't be null and both can't be set at the same
     * time.
     *
     * @return OnlineResource or null
     */
    @XmlElement("OnlineResource")
    OnLineResource getOnlineResource();

    /**
     * Returns on inline content.
     *
     * Both OnlineResource and InlineContent can't be null and both can't be set at the same
     * time.
     *
     * @return InlineContent or null
     */
    @XmlElement("InlineContent")
    Icon getInlineContent();

    /**
     * Returns the mime type of the onlineResource/InlineContent
     *
     * @return mime type
     */
    @XmlElement("Format")
    String getFormat();

    /**
     * Returns an integer value that can used for accessing a particular Font character in a TTF
     * file or a catalog for example.
     *
     * @return integer
     */
    @XmlElement("MarkIndex")
    int getMarkIndex();

    /**
     * calls the visit method of a StyleVisitor
     *
     * @param visitor the style visitor
     */
    @Extension
    Object accept(StyleVisitor visitor, Object extraData);
}