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/*
 * $Id: XRefTable.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.view.itext;

import com.lowagie.rups.controller.PdfReaderController;
import com.lowagie.rups.model.IndirectObjectFactory;
import com.lowagie.rups.model.ObjectLoader;
import com.lowagie.rups.view.models.JTableAutoModel;
import com.lowagie.rups.view.models.JTableAutoModelInterface;
import com.lowagie.text.pdf.PdfNull;
import com.lowagie.text.pdf.PdfObject;
import java.util.Observable;
import java.util.Observer;
import javax.swing.JTable;
import javax.swing.event.ListSelectionEvent;
import javax.swing.table.TableColumn;

/**
 * A JTable that shows the indirect objects of a PDF xref table.
 */
public class XRefTable extends JTable implements JTableAutoModelInterface, Observer {

    /**
     * A serial version UID.
     */
    private static final long serialVersionUID = -382184619041375537L;
    /**
     * The factory that can produce all the indirect objects.
     */
    protected IndirectObjectFactory objects;
    /**
     * The renderer that will render an object when selected in the table.
     */
    protected PdfReaderController controller;

    /**
     * Creates a JTable visualizing xref table.
     *
     * @param controller The renderer that will render an object when selected in the table.
     */
    public XRefTable(PdfReaderController controller) {
        super();
        this.controller = controller;
    }

    /**
     * @see java.util.Observer#update(java.util.Observable, java.lang.Object)
     */
    public void update(Observable observable, Object obj) {
        if (obj == null) {
            objects = null;
            repaint();
            return;
        }
        if (observable instanceof PdfReaderController
                && obj instanceof ObjectLoader) {
            ObjectLoader loader = (ObjectLoader) obj;
            objects = loader.getObjects();
            setModel(new JTableAutoModel(this));
            TableColumn col = getColumnModel().getColumn(0);
            col.setPreferredWidth(5);
        }
    }

    /**
     * @see javax.swing.JTable#getColumnCount()
     */
    public int getColumnCount() {
        return 2;
    }

    /**
     * @see javax.swing.JTable#getRowCount()
     */
    public int getRowCount() {
        if (objects == null) {
            return 0;
        }
        return objects.size();
    }

    /**
     * @see javax.swing.JTable#getValueAt(int, int)
     */
    public Object getValueAt(int rowIndex, int columnIndex) {
        switch (columnIndex) {
            case 0:
                return getObjectReferenceByRow(rowIndex);
            case 1:
                return getObjectDescriptionByRow(rowIndex);
            default:
                return null;
        }
    }

    /**
     * Gets the reference number of an indirect object based on the row index.
     *
     * @param rowIndex a row number
     * @return a reference number
     */
    protected int getObjectReferenceByRow(int rowIndex) {
        return objects.getRefByIndex(rowIndex);
    }

    /**
     * Gets the object that is shown in a row.
     *
     * @param rowIndex the row number containing the object
     * @return a PDF object
     */
    protected String getObjectDescriptionByRow(int rowIndex) {
        PdfObject object = objects.getObjectByIndex(rowIndex);
        if (object instanceof PdfNull) {
            return "Indirect object";
        }
        return object.toString();
    }

    /**
     * @see javax.swing.JTable#getColumnName(int)
     */
    public String getColumnName(int columnIndex) {
        switch (columnIndex) {
            case 0:
                return "Number";
            case 1:
                return "Object";
            default:
                return null;
        }
    }

    /**
     * Gets the object that is shown in a row.
     *
     * @param rowIndex the row number containing the object
     * @return a PDF object
     */
    protected PdfObject getObjectByRow(int rowIndex) {
        return objects.loadObjectByReference(getObjectReferenceByRow(rowIndex));
    }

    /**
     * Selects a row containing information about an indirect object.
     *
     * @param ref the reference number of the indirect object
     */
    public void selectRowByReference(int ref) {
        int row = objects.getIndexByRef(ref);
        setRowSelectionInterval(row, row);
        scrollRectToVisible(getCellRect(row, 1, true));
        valueChanged(null);
    }

    /**
     * @see javax.swing.JTable#valueChanged(javax.swing.event.ListSelectionEvent)
     */
    @Override
    public void valueChanged(ListSelectionEvent evt) {
        if (evt != null) {
            super.valueChanged(evt);
        }
        if (controller != null && objects != null) {
            controller.render(getObjectByRow(this.getSelectedRow()));
            controller.selectNode(getObjectReferenceByRow(getSelectedRow()));
        }
    }

}