element.java

一个java操作pdf文件的开发包,很好用的.

/*
 * $Id: Element.java,v 1.31 2002/06/20 13:30:24 blowagie Exp $
 * $Name:  $
 *
 * Copyright 1999, 2000, 2001, 2002 by Bruno Lowagie.
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * 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.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or 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.
 *
 * 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;

import java.util.ArrayList;

/**
 * Interface for a text element.
 * <P>
 * Remark: I looked at the interface javax.swing.text.Element, but
 * I decided to write my own text-classes for two reasons:
 * <OL>
 * <LI>The javax.swing.text-classes may be very generic, I think
 * they are overkill: they are to heavy for what they have to do.
 * <LI>A lot of people using iText (formerly known as rugPdf), still use JDK1.1.x.
 * I try to keep the Java2 requirements limited to the Collection classes
 * (I think they're really great). However, if I use the javax.swing.text
 * classes, it will become very difficult to downgrade rugPdf.
 * </OL>
 *
 * @see		Anchor
 * @see		Cell
 * @see		Chapter
 * @see		Chunk
 * @see		Gif
 * @see		Graphic
 * @see		Header
 * @see		Image
 * @see		Jpeg
 * @see		List
 * @see		ListItem
 * @see		Meta
 * @see		Paragraph
 * @see		Phrase
 * @see		Rectangle
 * @see		Row
 * @see		Section
 * @see		Table
 */

public interface Element {
    
    // static membervariables (meta information)
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int	HEADER = 0;
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int TITLE = 1;
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int SUBJECT = 2;
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int KEYWORDS = 3;
    
/** This is a possible type of <CODE>Element</CIDE>. */
    public static final int AUTHOR = 4;
    
/** This is a possible type of <CODE>Element</CIDE>. */
    public static final int PRODUCER = 5;
    
/** This is a possible type of <CODE>Element</CIDE>. */
    public static final int CREATIONDATE = 6;
    
/** This is a possible type of <CODE>Element</CIDE>. */
    public static final int CREATOR = 7;
    
    // static membervariables (content)
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int CHUNK = 10;
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int PHRASE = 11;
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int PARAGRAPH = 12;
    
/** This is a possible type of <CODE>Element</CODE> */
    public static final int SECTION = 13;
    
/** This is a possible type of <CODE>Element</CODE> */
    public static final int LIST = 14;
    
/** This is a possible type of <CODE>Element</CODE> */
    public static final int LISTITEM = 15;
    
/** This is a possible type of <CODE>Element</CODE> */
    public static final int CHAPTER = 16;
    
/** This is a possible type of <CODE>Element</CODE> */
    public static final int ANCHOR = 17;
    
    // static membervariables (tables)
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int CELL = 20;
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int ROW = 21;
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int TABLE = 22;
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int PTABLE = 23;
    
    // static membervariables (annotations)
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int ANNOTATION = 29;
    
    // static membervariables (geometric figures)
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int RECTANGLE = 30;
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int GIF = 31;
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int JPEG = 32;
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int PNG = 33;
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int IMGRAW = 34;
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int IMGTEMPLATE = 35;
    
/** This is a possible type of <CODE>Element</CODE>. */
    public static final int GRAPHIC = 39;
    
    // static membervariables (alignment)
       
/**
 * A possible value for paragraph alignment.  This
 * specifies that the text is aligned to the left
 * indent and extra whitespace should be placed on
 * the right.
 */
    public static final int ALIGN_UNDEFINED = -1;
    
/**
 * A possible value for paragraph alignment.  This
 * specifies that the text is aligned to the left
 * indent and extra whitespace should be placed on
 * the right.
 */
    public static final int ALIGN_LEFT = 0;
    
/**
 * A possible value for paragraph alignment.  This
 * specifies that the text is aligned to the center
 * and extra whitespace should be placed equally on
 * the left and right.
 */
    public static final int ALIGN_CENTER = 1;
    
/**
 * A possible value for paragraph alignment.  This
 * specifies that the text is aligned to the right
 * indent and extra whitespace should be placed on
 * the left.
 */
    public static final int ALIGN_RIGHT = 2;
    
/**
 * A possible value for paragraph alignment.  This
 * specifies that extra whitespace should be spread
 * out through the rows of the paragraph with the
 * text lined up with the left and right indent
 * except on the last line which should be aligned
 * to the left.
 */
    public static final int ALIGN_JUSTIFIED = 3;
    
/**
 * A possible value for vertical alignment.
 */
    
    public static final int ALIGN_TOP = 4;
    
/**
 * A possible value for vertical alignment.
 */
    
    public static final int ALIGN_MIDDLE = 5;
    
/**
 * A possible value for vertical alignment.
 */
    
    public static final int ALIGN_BOTTOM = 6;
    
/**
 * A possible value for vertical alignment.
 */
    public static final int ALIGN_BASELINE = 7;

    // static member variables for CCITT compression
    
    /** Pure two-dimensional encoding (Group 4)
     */    
    public static final int CCITTG4 = 0x100;
    /** Pure one-dimensional encoding (Group 3, 1-D)
     */    
    public static final int CCITTG3_1D = 0x101;
    /** Mixed one- and two-dimensional encoding (Group 3, 2-D)
     */    
    public static final int CCITTG3_2D = 0x102;    
    /** A flag indicating whether 1-bits are to be interpreted as black pixels
     *  and 0-bits as white pixels,
     */    
    public static final int CCITT_BLACKIS1 = 1;
    /** A flag indicating whether the filter expects extra 0-bits before each
     *  encoded line so that the line begins on a byte boundary.
     */
    public static final int CCITT_ENCODEDBYTEALIGN = 2;
    /** A flag indicating whether end-of-line bit patterns are required to be
     *  present in the encoding.
     */    
    public static final int CCITT_ENDOFLINE = 4;
    /** A flag indicating whether the filter expects the encoded data to be
     *  terminated by an end-of-block pattern, overriding the Rows
     *  parameter. The use of this flag will set the key /EndOfBlock to false.
     */    
    public static final int CCITT_ENDOFBLOCK = 8;
    
    
    // methods
    
/**
 * Processes the element by adding it (or the different parts) to an
 * <CODE>ElementListener</CODE>.
 *
 * @param	listener	an <CODE>ElementListener</CODE>
 * @return	<CODE>true</CODE> if the element was processed successfully
 */
    
    public boolean process(ElementListener listener);
    
/**
 * Gets the type of the text element.
 *
 * @return	a type
 */
    
    public int type();
    
/**
 * Gets all the chunks in this element.
 *
 * @return	an <CODE>ArrayList</CODE>
 */
    
    public ArrayList getChunks();
    
/**
 * Gets the content of the text element.
 *
 * @return	a type
 */
    
    public String toString();
}