src/org/apache/fop/fo/pagination/RepeatablePageMasterReference.java


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/*
 * $Id$
 * Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
 * For details on use and redistribution please refer to the
 * LICENSE file included with these sources.
 */

package org.apache.fop.fo.pagination;

import org.apache.fop.fo.*;
import org.apache.fop.apps.FOPException;

import org.xml.sax.Attributes;

/**
 * A repeatable-page-master-reference formatting object.
 * This handles a reference with a specified number of repeating
 * instances of the referenced page master (may have no limit).
 */
public class RepeatablePageMasterReference extends PageMasterReference
    implements SubSequenceSpecifier {

    private static final int INFINITE = -1;

    private PageSequenceMaster pageSequenceMaster;

    private int maximumRepeats;
    private int numberConsumed = 0;

    public RepeatablePageMasterReference(FONode parent) {
        super(parent);
    }

    public void handleAttrs(Attributes attlist) throws FOPException {
        super.handleAttrs(attlist);

        String mr = getProperty("maximum-repeats").getString();
        if (mr.equals("no-limit")) {
            this.maximumRepeats = INFINITE;
        } else {
            try {
                this.maximumRepeats = Integer.parseInt(mr);
                if (this.maximumRepeats < 0) {
                    getLogger().debug("negative maximum-repeats: "
                                      + this.maximumRepeats);
                    this.maximumRepeats = 0;
                }
            } catch (NumberFormatException nfe) {
                throw new FOPException("Invalid number for "
                                       + "'maximum-repeats' property");
            }
        }
    }

    public String getNextPageMasterName(boolean isOddPage,
                                        boolean isFirstPage,
                                        boolean isEmptyPage) {
        if (maximumRepeats != INFINITE) {
            if (numberConsumed < maximumRepeats) {
                numberConsumed++;
            } else {
                return null;
            }
        }
        return getMasterName();
    }

    public void reset() {
        this.numberConsumed = 0;
    }

}