com.bizosys.hsearch.inpipe.ComputeTokens.java Source code

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Here is the source code for com.bizosys.hsearch.inpipe.ComputeTokens.java

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/*
* Copyright 2010 Bizosys Technologies Limited
*
* Licensed to the Bizosys Technologies Limited (Bizosys) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The Bizosys 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.bizosys.hsearch.inpipe;

import java.io.IOException;
import java.util.List;

import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import com.bizosys.oneline.ApplicationFault;
import com.bizosys.oneline.SystemFault;
import com.bizosys.oneline.conf.Configuration;
import com.bizosys.oneline.pipes.PipeIn;

import com.bizosys.hsearch.index.Doc;
import com.bizosys.hsearch.index.DocTerms;
import com.bizosys.hsearch.index.DocumentType;
import com.bizosys.hsearch.index.Term;
import com.bizosys.hsearch.index.TermStream;
import com.bizosys.hsearch.inpipe.util.ReaderType;

/**
 * Tokenize text content
 * @author karan
 *
 */
public class ComputeTokens implements PipeIn {

    public PipeIn getInstance() {
        return this;
    }

    public String getName() {
        return "ComputeTokens";
    }

    public void init(Configuration conf) {
    }

    public void visit(Object docObj, boolean multiWriter) throws SystemFault, ApplicationFault {

        if (null == docObj)
            throw new ApplicationFault("Null Document");
        Doc doc = (Doc) docObj;

        List<TermStream> streams = doc.terms.getTokenStreams();
        if (null != streams) {
            try {
                for (TermStream stream : streams) {
                    tokenize(doc, stream);
                    stream.stream.close();
                    stream = null;
                }
            } catch (IOException ex) {
                throw new SystemFault("ComputeTokens : Tokenize Failed.", ex);
            } finally {
                streams.clear();
                cleanReaders(doc);
            }
        }

        /**
         * Assign the document type to all the terms
         */
        Byte docTypeCode = null;
        if (null != doc.meta.docType)
            docTypeCode = DocumentType.getInstance().getTypeCode(doc.tenant, doc.meta.docType);
        if (null == docTypeCode)
            return;
        doc.terms.setDocumentTypeCode(docTypeCode);
    }

    private void tokenize(Doc doc, TermStream ts) throws SystemFault, ApplicationFault, IOException {
        if (null == ts)
            return;
        TokenStream stream = ts.stream;
        if (null == stream)
            return;

        DocTerms terms = doc.terms;
        if (null == doc.terms) {
            terms = new DocTerms();
            doc.terms = terms;
        }

        String token = null;
        int offset = 0;
        CharTermAttribute termA = (CharTermAttribute) stream.getAttribute(CharTermAttribute.class);
        OffsetAttribute offsetA = (OffsetAttribute) stream.getAttribute(OffsetAttribute.class);
        stream.reset();
        while (stream.incrementToken()) {
            token = termA.toString();
            offset = offsetA.startOffset();
            Term term = new Term(doc.tenant, token, ts.sighting, ts.type, offset);
            terms.getTermList().add(term);
        }
        stream.close();
    }

    public void commit(boolean arg0) {
    }

    private void cleanReaders(Doc doc) {
        if (null == doc.readers)
            return;
        for (ReaderType reader : doc.readers) {
            try {
                if (null != reader.reader)
                    reader.reader.close();
            } catch (IOException ex) {
                InpipeLog.l.warn("ComputeTokens:cleanReaders() reader closing failed", ex);
            }
        }
        doc.readers.clear();
        doc.readers = null;
    }

}