/*
 * $Id: UnresolvedPageNumber.java,v 1.7 2003/03/05 16:45:43 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.area.inline;

import org.apache.fop.area.PageViewport;
import org.apache.fop.area.Resolveable;

import java.util.List;

/**
 * Unresolveable page number area.
 * This is a word area that resolves itself to a page number
 * from an id reference.
 */
public class UnresolvedPageNumber extends Word implements Resolveable {
    private boolean resolved = false;
    private String pageRefId;

    /**
     * Create a new unresolveable page number.
     *
     * @param id the id reference for resolving this
     */
    public UnresolvedPageNumber(String id) {
        pageRefId = id;
        word = "?";
    }

    /**
     * Get the id references for this area.
     *
     * @return the id reference for this unresolved page number
     */
    public String[] getIDs() {
        return new String[] {pageRefId};
    }

    /**
     * Resolve this page number reference.
     * This resolves the reference by getting the page number
     * string from the first page in the list of pages that apply
     * for the id reference. The word string is then set to the
     * page number string.
     *
     * @param id the id reference being resolved
     * @param pages the list of pages for the id reference
     */
    public void resolve(String id, List pages) {
        resolved = true;
        if (pages != null) {
            PageViewport page = (PageViewport)pages.get(0);
            String str = page.getPageNumber();
            word = str;

            /**@todo Update IPD ??? */
        }
    }

    /**
     * Check if this is resolved.
     *
     * @return true when this has been resolved
     */
    public boolean isResolved() {
       return resolved;
    }
}