org.asqatasun.crawler.util.HeritrixAttributeValueModifierAndEraser.java Source code

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Here is the source code for org.asqatasun.crawler.util.HeritrixAttributeValueModifierAndEraser.java

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/*
 * Asqatasun - Automated webpage assessment
 * Copyright (C) 2008-2015  Asqatasun.org
 *
 * This file is part of Asqatasun.
 *
 * Asqatasun is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Contact us by mail: asqatasun AT asqatasun DOT org
 */
package org.asqatasun.crawler.util;

import javax.xml.xpath.XPathExpressionException;
import org.apache.commons.lang3.StringUtils;
import org.apache.log4j.Logger;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

/**
 *
 * @author jkowalczyk
 */
public class HeritrixAttributeValueModifierAndEraser extends DefaultHeritrixConfigurationModifier {

    private static final Logger LOGGER = Logger.getLogger(HeritrixAttributeValueModifierAndEraser.class);
    private static final String DEFAULT_ATTRIBUTE_NAME = "value";

    public HeritrixAttributeValueModifierAndEraser() {
        super();
    }

    @Override
    public Document modifyDocument(Document document, String value) {
        try {
            Node parentNode = getNodeFromXpath(document);
            NamedNodeMap attr = parentNode.getAttributes();
            Node nodeAttr = attr.getNamedItem(DEFAULT_ATTRIBUTE_NAME);
            if (StringUtils.isNotEmpty(value)) {
                nodeAttr.setTextContent(value);
                if (LOGGER.isDebugEnabled()) {
                    LOGGER.debug("Update " + getAttributeValue() + " attribute of bean " + getIdBeanParent()
                            + " with value " + value);
                }
            } else {
                if (LOGGER.isDebugEnabled()) {
                    LOGGER.debug("Delete " + getAttributeValue() + " attribute of bean " + getIdBeanParent()
                            + " because of null or empty value ");
                }
                parentNode.getParentNode().removeChild(parentNode);
            }
        } catch (XPathExpressionException ex) {
            Logger.getLogger(HeritrixParameterValueModifier.class.getName()).warn(ex);
        }
        return document;
    }

}