IndexAllArticlesJob.java

/**
 * Copyright 1999-2009 The Pegadi Team
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.pegadi.server.index;

import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.pegadi.index.IndexJob;
import org.pegadi.index.JobContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.helpers.XMLReaderFactory;

import javax.sql.DataSource;
import java.io.IOException;
import java.io.StringReader;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class IndexAllArticlesJob implements IndexJob {
    private DataSource dataSource;

    private Logger log = LoggerFactory.getLogger(getClass());

    public void executeJob(JobContext jobContext) {
        int count = 0;

        Connection c = null;
        try {
            XMLReader reader = XMLReaderFactory.createXMLReader();
            final StringBuffer text = new StringBuffer();
            ContentHandler handler = new DefaultHandler() {
                boolean isInText = false;

                public void startElement(String string, String string1, String string2, Attributes attributes) throws SAXException {
                    if(string1.equals("text")) {
                        isInText = true;
                    }
                }

                public void characters(char[] chars, int i, int i1) throws SAXException {
                    if(isInText) {
                        text.append(chars, i , i1);
                    }
                }

                public void endElement(String string, String string1, String string2) throws SAXException {
                    if(string1.equals("text")) {
                        isInText = false;
                    }
                }
            };
            reader.setContentHandler(handler);

            c = dataSource.getConnection();
            PreparedStatement p = c.prepareStatement("SELECT id, text from article");
            ResultSet rs = p.executeQuery();
            while(rs.next()) {
                String  id = rs.getString(1);
                String xml = rs.getString(2);
                text.setLength(0);
                try {
                    if(xml != null && xml.startsWith("<?")) {
                        reader.parse(new InputSource(new StringReader(xml)));
                    }
                } catch (IOException e) {
                    log.error("parsing of article " + id +" failed");
                } catch (SAXException e) {
                    log.error("parsing of article " + id +" failed");
                }
                Document d = new Document();
                d.add(Field.Keyword("id", id));
                d.add(Field.Text("content", new StringReader(text.toString())));
                try {
                    jobContext.getIndexWriter().addDocument(d);
                } catch (IOException e) {
                    log.error("Failed adding article " + id +" to index");
                }
                if(count++ % 100 == 0) {
                    log.info("Indexed " + count +" articles");
                }
            }
        } catch (SQLException e) {
            log.error("Sql error", e);
        } catch (SAXException e) {
            log.error("Parse error", e);
        } finally {
            if(c != null) {
                try {
                    c.close();
                } catch (SQLException e) {
                    log.error("sql error", e);
                }
            }
        }
    }

    public boolean isRecreateJob() {
        return true;
    }

    public void setDataSource(DataSource dataSource) {
        this.dataSource = dataSource;
    }
}