DomainParseFilter.java

/**
 * Licensed to DigitalPebble Ltd under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * DigitalPebble 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 com.digitalpebble.stormcrawler.parse.filter;

import java.util.HashMap;
import java.util.Map;

import org.w3c.dom.DocumentFragment;

import com.digitalpebble.stormcrawler.Constants;
import com.digitalpebble.stormcrawler.Metadata;
import com.digitalpebble.stormcrawler.parse.ParseFilter;
import com.digitalpebble.stormcrawler.parse.ParseResult;
import com.digitalpebble.stormcrawler.util.URLPartitioner;
import com.fasterxml.jackson.databind.JsonNode;

/** Adds domain (or host) to metadata - can be used later on for indexing **/
public class DomainParseFilter extends ParseFilter {

    private URLPartitioner partitioner;

    private String mdKey = "domain";

    public void configure(@SuppressWarnings("rawtypes") Map stormConf,
            JsonNode filterParams) {
        JsonNode node = filterParams.get("key");
        if (node != null && node.isTextual()) {
            mdKey = node.asText("domain");
        }

        String partitionMode = Constants.PARTITION_MODE_DOMAIN;

        node = filterParams.get("byHost");
        if (node != null && node.asBoolean()) {
            partitionMode = Constants.PARTITION_MODE_HOST;
        }

        partitioner = new URLPartitioner();
        Map config = new HashMap();
        config.put(Constants.PARTITION_MODEParamName, partitionMode);
        partitioner.configure(config);
    }

    @Override
    public void filter(String URL, byte[] content, DocumentFragment doc,
            ParseResult parse) {
        Metadata metadata = parse.get(URL).getMetadata();
        String value = partitioner.getPartition(URL, metadata);
        metadata.setValue(mdKey, value);
    }

}