001/* 002 * $Id: FilteredRenderListener.java 4784 2011-03-15 08:33:00Z blowagie $ 003 * 004 * This file is part of the iText (R) project. 005 * Copyright (c) 1998-2011 1T3XT BVBA 006 * Authors: Kevin Day, Bruno Lowagie, Paulo Soares, et al. 007 * 008 * This program is free software; you can redistribute it and/or modify 009 * it under the terms of the GNU Affero General Public License version 3 010 * as published by the Free Software Foundation with the addition of the 011 * following permission added to Section 15 as permitted in Section 7(a): 012 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT, 013 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS. 014 * 015 * This program is distributed in the hope that it will be useful, but 016 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 017 * or FITNESS FOR A PARTICULAR PURPOSE. 018 * See the GNU Affero General Public License for more details. 019 * You should have received a copy of the GNU Affero General Public License 020 * along with this program; if not, see http://www.gnu.org/licenses or write to 021 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 022 * Boston, MA, 02110-1301 USA, or download the license from the following URL: 023 * http://itextpdf.com/terms-of-use/ 024 * 025 * The interactive user interfaces in modified source and object code versions 026 * of this program must display Appropriate Legal Notices, as required under 027 * Section 5 of the GNU Affero General Public License. 028 * 029 * In accordance with Section 7(b) of the GNU Affero General Public License, 030 * a covered work must retain the producer line in every PDF that is created 031 * or manipulated using iText. 032 * 033 * You can be released from the requirements of the license by purchasing 034 * a commercial license. Buying such a license is mandatory as soon as you 035 * develop commercial activities involving the iText software without 036 * disclosing the source code of your own applications. 037 * These activities include: offering paid services to customers as an ASP, 038 * serving PDFs on the fly in a web application, shipping iText with a closed 039 * source product. 040 * 041 * For more information, please contact iText Software Corp. at this 042 * address: sales@itextpdf.com 043 */ 044package com.itextpdf.text.pdf.parser; 045 046/** 047 * A text render listener that filters text operations before passing them on to a delegate 048 * @since 5.0.1 049 */ 050 051public class FilteredRenderListener implements RenderListener { 052 053 /** The delegate that will receive the text render operation if the filters all pass */ 054 private final RenderListener delegate; 055 /** The filters to be applied */ 056 private final RenderFilter[] filters; 057 058 /** 059 * Construction 060 * @param delegate the delegate {@link RenderListener} that will receive filtered text operations 061 * @param filters the filter(s) to apply 062 */ 063 public FilteredRenderListener(RenderListener delegate, RenderFilter... filters) { 064 this.delegate = delegate; 065 this.filters = filters; 066 } 067 068 /** 069 * Applies filters, then delegates to the delegate if all filters pass 070 * @param renderInfo contains info to render text 071 * @see com.itextpdf.text.pdf.parser.RenderListener#renderText(com.itextpdf.text.pdf.parser.TextRenderInfo) 072 */ 073 public void renderText(TextRenderInfo renderInfo) { 074 for (RenderFilter filter : filters) { 075 if (!filter.allowText(renderInfo)) 076 return; 077 } 078 delegate.renderText(renderInfo); 079 } 080 081 /** 082 * This class delegates this call 083 * @see com.itextpdf.text.pdf.parser.RenderListener#beginTextBlock() 084 */ 085 public void beginTextBlock() { 086 delegate.beginTextBlock(); 087 } 088 089 /** 090 * This class delegates this call 091 * @see com.itextpdf.text.pdf.parser.RenderListener#endTextBlock() 092 */ 093 public void endTextBlock() { 094 delegate.endTextBlock(); 095 } 096 097 /** 098 * Applies filters, then delegates to the delegate if all filters pass 099 * @see com.itextpdf.text.pdf.parser.RenderListener#renderImage(com.itextpdf.text.pdf.parser.ImageRenderInfo) 100 * @since 5.0.1 101 */ 102 public void renderImage(ImageRenderInfo renderInfo) { 103 for (RenderFilter filter : filters) { 104 if (!filter.allowImage(renderInfo)) 105 return; 106 } 107 delegate.renderImage(renderInfo); 108 } 109 110}