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}