org.carrot2.source.pubmed.PubMedSearchHandler.java Source code

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Here is the source code for org.carrot2.source.pubmed.PubMedSearchHandler.java

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/*
 * Carrot2 project.
 *
 * Copyright (C) 2002-2012, Dawid Weiss, Stanisaw Osiski.
 * All rights reserved.
 *
 * Refer to the full license file "carrot2.LICENSE"
 * in the root folder of the repository checkout or at:
 * http://www.carrot2.org/carrot2.LICENSE
 */

package org.carrot2.source.pubmed;

import java.util.List;

import org.xml.sax.*;

import com.google.common.collect.Lists;

/**
 * A SAX content handler that collects PubMed IDs.
 */
class PubMedSearchHandler implements ContentHandler {
    /** Collects IDs of PubMed entries to retrieve */
    private List<String> pubMedPrimaryIds;

    /** For locating/storing IDs */
    private StringBuffer id;
    private boolean handlingId;

    public List<String> getPubMedPrimaryIds() {
        return pubMedPrimaryIds;
    }

    public void startDocument() throws SAXException {
        pubMedPrimaryIds = Lists.newArrayListWithExpectedSize(100);
        handlingId = false;
        id = new StringBuffer();
    }

    public void startElement(String namespaceURI, String localName, String qName, Attributes atts)
            throws SAXException {
        handlingId = "Id".equals(localName);
        id.setLength(0);
    }

    public void endElement(String namespaceURI, String localName, String qName) throws SAXException {
        if (handlingId) {
            pubMedPrimaryIds.add(id.toString());
            handlingId = false;
        }
    }

    public void characters(char[] ch, int start, int length) throws SAXException {
        if (handlingId) {
            id.append(ch, start, length);
        }
    }

    public void endDocument() throws SAXException {
    }

    public void endPrefixMapping(String prefix) throws SAXException {
    }

    public void ignorableWhitespace(char[] ch, int start, int length) throws SAXException {
    }

    public void processingInstruction(String target, String data) throws SAXException {
    }

    public void setDocumentLocator(Locator locator) {
    }

    public void skippedEntity(String name) throws SAXException {
    }

    public void startPrefixMapping(String prefix, String uri) throws SAXException {
    }
}