org.apache.solr.handler.dataimport.PlainTextEntityProcessor.java Source code

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Here is the source code for org.apache.solr.handler.dataimport.PlainTextEntityProcessor.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.solr.handler.dataimport;

import static org.apache.solr.handler.dataimport.DataImportHandlerException.SEVERE;
import static org.apache.solr.handler.dataimport.DataImportHandlerException.wrapAndThrow;
import static org.apache.solr.handler.dataimport.XPathEntityProcessor.URL;
import org.apache.commons.io.IOUtils;

import java.io.IOException;
import java.io.Reader;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.Map;

/**
 * <p>An implementation of {@link EntityProcessor} which reads data from a url/file and give out a row which contains one String
 * value. The name of the field is 'plainText'.
 *
 * @since solr 1.4
 */
public class PlainTextEntityProcessor extends EntityProcessorBase {
    private boolean ended = false;

    @Override
    public void init(Context context) {
        super.init(context);
        ended = false;
    }

    @Override
    public Map<String, Object> nextRow() {
        if (ended)
            return null;
        DataSource<Reader> ds = context.getDataSource();
        String url = context.replaceTokens(context.getEntityAttribute(URL));
        Reader r = null;
        try {
            r = ds.getData(url);
        } catch (Exception e) {
            wrapAndThrow(SEVERE, e, "Exception reading url : " + url);
        }
        StringWriter sw = new StringWriter();
        char[] buf = new char[1024];
        while (true) {
            int len = 0;
            try {
                len = r.read(buf);
            } catch (IOException e) {
                IOUtils.closeQuietly(r);
                wrapAndThrow(SEVERE, e, "Exception reading url : " + url);
            }
            if (len <= 0)
                break;
            sw.append(new String(buf, 0, len));
        }
        Map<String, Object> row = new HashMap<>();
        row.put(PLAIN_TEXT, sw.toString());
        ended = true;
        IOUtils.closeQuietly(r);
        return row;
    }

    public static final String PLAIN_TEXT = "plainText";
}