/*
 * $Id: PDFResourceContext.java,v 1.5 2003/03/07 08:25:47 jeremias Exp $
 * ============================================================================
 *                    The Apache Software License, Version 1.1
 * ============================================================================
 * 
 * Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modifica-
 * tion, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * 3. The end-user documentation included with the redistribution, if any, must
 *    include the following acknowledgment: "This product includes software
 *    developed by the Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself, if
 *    and wherever such third-party acknowledgments normally appear.
 * 
 * 4. The names "FOP" and "Apache Software Foundation" must not be used to
 *    endorse or promote products derived from this software without prior
 *    written permission. For written permission, please contact
 *    apache@apache.org.
 * 
 * 5. Products derived from this software may not be called "Apache", nor may
 *    "Apache" appear in their name, without prior written permission of the
 *    Apache Software Foundation.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
 * DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ============================================================================
 * 
 * This software consists of voluntary contributions made by many individuals
 * on behalf of the Apache Software Foundation and was originally created by
 * James Tauber <jtauber@jtauber.com>. For more information on the Apache
 * Software Foundation, please see <http://www.apache.org/>.
 */ 
package org.apache.fop.pdf;

/**
 * The PDF resource context.
 *
 * There is one of these for every page in a PDF document. The object
 * specifies the dimensions of the page and references a /Resources
 * object, a contents stream and the page's parent in the page
 * hierarchy.
 *
 * Modified by Mark Lillywhite, mark-fop@inomial.com. The Parent
 * object was being referred to by reference, but all that we
 * ever used from the Parent was its PDF object ID, and according
 * to the memory profile this was causing OOM issues. So, we store
 * only the object ID of the parent, rather than the parent itself.
 */
public class PDFResourceContext extends PDFObject {

    /**
     * the page's /Resource object
     */
    protected PDFResources resources;

    /**
     * the list of annotation objects for this page
     */
    protected PDFAnnotList annotList;

    /**
     * Creates a new ResourceContext.
     * @param resources the /Resources object
     */
    public PDFResourceContext(PDFResources resources) {
        /* generic creation of object */
        super();

        /* set fields using parameters */
        //this.document = doc;
        this.resources = resources;
        this.annotList = null;
    }

    /**
     * Get the resources for this resource context.
     *
     * @return the resources in this resource context
     */
    public PDFResources getPDFResources() {
        return this.resources;
    }

    /**
     * set this page's annotation list
     *
     * @param annot a PDFAnnotList list of annotations
     */
    public void addAnnotation(PDFObject annot) {
        if (this.annotList == null) {
            this.annotList = getDocument().getFactory().makeAnnotList();
        }
        this.annotList.addAnnot(annot);
    }

    /**
     * Get the current annotations.
     *
     * @return the current annotation list
     */
    public PDFAnnotList getAnnotations() {
        return this.annotList;
    }

    /**
     * A a GState to this resource context.
     *
     * @param gstate the GState to add
     */
    public void addGState(PDFGState gstate) {
        getPDFResources().addGState(gstate);
    }

    /**
     * Add the shading to the current resource context.
     *
     * @param shading the shading to add
     */
    public void addShading(PDFShading shading) {
        getPDFResources().addShading(shading);
    }

}