/*
 * $Id: PdfDestination.java,v 1.22 2002/06/20 13:28:22 blowagie Exp $
 * $Name:  $
 *
 * Copyright 1999, 2000, 2001, 2002 Bruno Lowagie
 *
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 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
 * Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library 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.
 *
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */

package com.lowagie.text.pdf;

/**
 * A <CODE>PdfColor</CODE> defines a Color (it's a <CODE>PdfArray</CODE> containing 3 values).
 *
 * @see		PdfDictionary
 */

public class PdfDestination extends PdfArray {
    
    // public static final member-variables
    
/** This is a possible destination type */
    public static final int XYZ = 0;
    
/** This is a possible destination type */
    public static final int FIT = 1;
    
/** This is a possible destination type */
    public static final int FITH = 2;
    
/** This is a possible destination type */
    public static final int FITV = 3;
    
/** This is a possible destination type */
    public static final int FITR = 4;
    
/** This is a possible destination type */
    public static final int FITB = 5;
    
/** This is a possible destination type */
    public static final int FITBH = 6;
    
/** This is a possible destination type */
    public static final int FITBV = 7;
    
    // member variables
    
/** Is the indirect reference to a page already added? */
    private boolean status = false;
    
    // constructors
    
/**
 * Constructs a new <CODE>PdfDestination</CODE>.
 * <P>
 * If <VAR>type</VAR> equals <VAR>FITB</VAR>, the bounding box of a page
 * will fit the window of the Reader. Otherwise the type will be set to
 * <VAR>FIT</VAR> so that the entire page will fit to the window.
 *
 * @param		type		The destination type
 */
    
    public PdfDestination(int type) {
        super();
        if (type == FITB) {
            add(PdfName.FITB);
        }
        else {
            add(PdfName.FIT);
        }
    }
    
/**
 * Constructs a new <CODE>PdfDestination</CODE>.
 * <P>
 * If <VAR>type</VAR> equals <VAR>FITBH</VAR> / <VAR>FITBV</VAR>,
 * the width / height of the bounding box of a page will fit the window
 * of the Reader. The parameter will specify the y / x coordinate of the
 * top / left edge of the window. If the <VAR>type</VAR> equals <VAR>FITH</VAR>
 * or <VAR>FITV</VAR> the width / height of the entire page will fit
 * the window and the parameter will specify the y / x coordinate of the
 * top / left edge. In all other cases the type will be set to <VAR>FITH</VAR>.
 *
 * @param		type		the destination type
 * @param		parameter	a parameter to combined with the destination type
 */
    
    public PdfDestination(int type, float parameter) {
        super(new PdfNumber(parameter));
        switch(type) {
            default:
                addFirst(PdfName.FITH);
                break;
            case FITV:
                addFirst(PdfName.FITV);
                break;
            case FITBH:
                addFirst(PdfName.FITBH);
                break;
            case FITBV:
                addFirst(PdfName.FITBV);
        }
    }
    
/** Constructs a new <CODE>PdfDestination</CODE>.
 * <P>
 * Display the page, with the coordinates (left, top) positioned
 * at the top-left corner of the window and the contents of the page magnified
 * by the factor zoom. A negative value for any of the parameters left or top, or a
 * zoom value of 0 specifies that the current value of that parameter is to be retained unchanged.
 * @param type must be a <VAR>PdfDestination.XYZ</VAR>
 * @param left the left value. Negative to place a null
 * @param top the top value. Negative to place a null
 * @param zoom The zoom factor. A value of 0 keeps the current value
 */
    
    public PdfDestination(int type, float left, float top, float zoom) {
        super(PdfName.XYZ);
        if (left < 0)
            add(PdfNull.PDFNULL);
        else
            add(new PdfNumber(left));
        if (top < 0)
            add(PdfNull.PDFNULL);
        else
            add(new PdfNumber(top));
        add(new PdfNumber(zoom));
    }
    
/** Constructs a new <CODE>PdfDestination</CODE>.
 * <P>
 * Display the page, with its contents magnified just enough
 * to fit the rectangle specified by the coordinates left, bottom, right, and top
 * entirely within the window both horizontally and vertically. If the required
 * horizontal and vertical magnification factors are different, use the smaller of
 * the two, centering the rectangle within the window in the other dimension.
 *
 * @param type must be PdfDestination.FITR
 * @param left a parameter
 * @param bottom a parameter
 * @param right a parameter
 * @param top a parameter
 * @since iText0.38
 */
    
    public PdfDestination(int type, float left, float bottom, float right, float top) {
        super(PdfName.FITR);
        add(new PdfNumber(left));
        add(new PdfNumber(bottom));
        add(new PdfNumber(right));
        add(new PdfNumber(top));
    }
    
    // methods
    
/**
 * Checks if an indirect reference to a page has been added.
 *
 * @return	<CODE>true</CODE> or <CODE>false</CODE>
 */
    
    public boolean hasPage() {
        return status;
    }
    
/** Adds the indirect reference of the destination page.
 *
 * @param page	an indirect reference
 * @return true if the page reference was added
 */
    
    public boolean addPage(PdfIndirectReference page) {
        if (!status) {
            addFirst(page);
            status = true;
            return true;
        }
        return false;
    }
}