com.lowagie.rups.model.ObjectLoader Maven / Gradle / Ivy

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/*
 * $Id: ObjectLoader.java 3117 2008-01-31 05:53:22Z xlv $
 *
 * Copyright 2007 Bruno Lowagie.
 *
 * 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; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

package com.lowagie.rups.model;

import com.lowagie.text.pdf.PdfReader;
import java.util.Observable;

/**
 * Loads the necessary iText PDF objects in Background.
 */
public class ObjectLoader extends BackgroundTask {

    /**
     * This is the object that will forward the updates to the observers.
     */
    protected Observable observable;
    /**
     * iText's PdfReader object.
     */
    protected PdfReader reader;
    /**
     * The factory that can provide PDF objects.
     */
    protected IndirectObjectFactory objects;
    /**
     * The factory that can provide tree nodes.
     */
    protected TreeNodeFactory nodes;

    /**
     * Creates a new ObjectLoader.
     *
     * @param observable the object that will forward the changes.
     * @param reader     the PdfReader from which the objects will be read.
     */
    public ObjectLoader(Observable observable, PdfReader reader) {
        this.observable = observable;
        this.reader = reader;
        start();
    }

    /**
     * Getter for the PdfReader object.
     *
     * @return a reader object
     */
    public PdfReader getReader() {
        return reader;
    }

    /**
     * Getter for the object factory.
     *
     * @return an indirect object factory
     */
    public IndirectObjectFactory getObjects() {
        return objects;
    }

    /**
     * Getter for the tree node factory.
     *
     * @return a tree node factory
     */
    public TreeNodeFactory getNodes() {
        return nodes;
    }

    /**
     * @see com.lowagie.rups.model.BackgroundTask#doTask()
     */
    @Override
    public void doTask() {
        ProgressDialog progress = new ProgressDialog(null, "Reading PDF file");
        objects = new IndirectObjectFactory(reader);
        int n = objects.getXRefMaximum();
        progress.setMessage("Reading the Cross-Reference table");
        progress.setTotal(n);
        while (objects.storeNextObject()) {
            progress.setValue(objects.getCurrent());
        }
        progress.setTotal(0);
        nodes = new TreeNodeFactory(objects);
        progress.setMessage("Updating GUI");
        observable.notifyObservers(this);
        progress.dispose();
    }
}