org.apache.nutch.indexer.solr.SolrMappingReader.java Source code

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Here is the source code for org.apache.nutch.indexer.solr.SolrMappingReader.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.nutch.indexer.solr;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.util.HashMap;
import java.util.Map;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.nutch.util.ObjectCache;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class SolrMappingReader {
    public static Log LOG = LogFactory.getLog(SolrMappingReader.class);

    /** The property name of the parse solr index mapping location */
    private static final String SS_FILE_MAPPING = "solrindex.mapping.file";

    private Configuration conf;

    private Map<String, String> keyMap = new HashMap<String, String>();
    private Map<String, String> copyMap = new HashMap<String, String>();
    private String uniqueKey = "id";

    public static synchronized SolrMappingReader getInstance(Configuration conf) {
        ObjectCache cache = ObjectCache.get(conf);
        SolrMappingReader instance = (SolrMappingReader) cache.getObject(SolrMappingReader.class.getName());
        if (instance == null) {
            instance = new SolrMappingReader(conf);
            cache.setObject(SolrMappingReader.class.getName(), instance);
        }
        return instance;
    }

    protected SolrMappingReader(Configuration conf) {
        this.conf = conf;
        parseMapping();
    }

    private void parseMapping() {
        InputStream ssInputStream = null;
        ssInputStream = conf.getConfResourceAsInputStream(conf.get(SS_FILE_MAPPING, "solrindex-mapping.xml"));
        InputSource inputSource = new InputSource(ssInputStream);
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse(inputSource);
            Element rootElement = document.getDocumentElement();
            NodeList fieldList = rootElement.getElementsByTagName("field");
            if (fieldList.getLength() > 0) {
                for (int i = 0; i < fieldList.getLength(); i++) {
                    Element element = (Element) fieldList.item(i);
                    LOG.info(
                            "source: " + element.getAttribute("source") + " dest: " + element.getAttribute("dest"));
                    keyMap.put(element.getAttribute("source"), element.getAttribute("dest"));
                }
            }
            NodeList copyFieldList = rootElement.getElementsByTagName("copyField");
            if (copyFieldList.getLength() > 0) {
                for (int i = 0; i < copyFieldList.getLength(); i++) {
                    Element element = (Element) copyFieldList.item(i);
                    LOG.info(
                            "source: " + element.getAttribute("source") + " dest: " + element.getAttribute("dest"));
                    copyMap.put(element.getAttribute("source"), element.getAttribute("dest"));
                }
            }
            NodeList uniqueKeyItem = rootElement.getElementsByTagName("uniqueKey");
            if (uniqueKeyItem.getLength() > 1) {
                LOG.warn("More than one unique key definitions found in solr index mapping, using default 'id'");
                uniqueKey = "id";
            } else if (uniqueKeyItem.getLength() == 0) {
                LOG.warn("No unique key definition found in solr index mapping using, default 'id'");
            } else {
                uniqueKey = uniqueKeyItem.item(0).getFirstChild().getNodeValue();
            }
        } catch (MalformedURLException e) {
            LOG.warn(e.toString());
        } catch (SAXException e) {
            LOG.warn(e.toString());
        } catch (IOException e) {
            LOG.warn(e.toString());
        } catch (ParserConfigurationException e) {
            LOG.warn(e.toString());
        }
    }

    public Map<String, String> getKeyMap() {
        return keyMap;
    }

    public Map<String, String> getCopyMap() {
        return copyMap;
    }

    public String getUniqueKey() {
        return uniqueKey;
    }

    public String hasCopy(String key) {
        if (copyMap.containsKey(key)) {
            key = (String) copyMap.get(key);
        }
        return key;
    }

    public String mapKey(String key) throws IOException {
        if (keyMap.containsKey(key)) {
            key = (String) keyMap.get(key);
        }
        return key;
    }

    public String mapCopyKey(String key) throws IOException {
        if (copyMap.containsKey(key)) {
            key = (String) copyMap.get(key);
        }
        return key;
    }
}