[Issue #31] (Team4) Keyword Operator #85
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,97 @@ | ||
| package edu.uci.ics.textdb.dataflow.common; | ||
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import edu.uci.ics.textdb.api.common.Attribute; | ||
| import edu.uci.ics.textdb.common.utils.Utils; | ||
| import org.apache.lucene.analysis.Analyzer; | ||
| import org.apache.lucene.queryparser.classic.MultiFieldQueryParser; | ||
| import org.apache.lucene.queryparser.classic.ParseException; | ||
| import org.apache.lucene.search.BooleanClause; | ||
| import org.apache.lucene.search.BooleanQuery; | ||
| import org.apache.lucene.search.Query; | ||
| import edu.uci.ics.textdb.api.common.IPredicate; | ||
| import edu.uci.ics.textdb.api.common.ITuple; | ||
| import edu.uci.ics.textdb.common.exception.DataFlowException; | ||
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| /** | ||
| * @author prakul | ||
| * | ||
| */ | ||
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| /** | ||
| * This class handles creation of predicate for querying using Keyword Matcher | ||
| */ | ||
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There was a problem hiding this comment. Add high-level comments to explain the purpose of this class. |
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| public class KeywordPredicate implements IPredicate{ | ||
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| private final List<Attribute> attributeList; | ||
| private final String[] fields; | ||
| private final String query; | ||
| private final Query queryObject; | ||
| private ArrayList<String> tokens; | ||
| private Analyzer analyzer; | ||
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| public KeywordPredicate(String query, List<Attribute> attributeList, Analyzer analyzer ) throws DataFlowException{ | ||
| try { | ||
| this.query = query; | ||
| this.attributeList = attributeList; | ||
| String[] temp = new String[attributeList.size()]; | ||
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| for(int i=0; i < attributeList.size(); i++){ | ||
| temp[i] = attributeList.get(i).getFieldName(); | ||
| } | ||
| this.fields = temp; | ||
| this.tokens = Utils.tokenizeQuery(analyzer, this.query); | ||
| this.analyzer = analyzer; | ||
| this.queryObject = createQueryObject(); | ||
| } catch (Exception e) { | ||
| e.printStackTrace(); | ||
| throw new DataFlowException(e.getMessage(), e); | ||
| } | ||
| } | ||
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| @Override | ||
| public boolean satisfy(ITuple tuple) { | ||
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| //This method is necessary for the interface implementation, and it's really not used. | ||
| return true; | ||
| } | ||
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| /** | ||
| * Creates a Query object as a boolean Query on all attributes. | ||
| * Example: For creating a query like | ||
| * (TestConstants.DESCRIPTION + ":lin" + " AND " + TestConstants.LAST_NAME + ":lin") | ||
| * we provide a list of AttributeFields (Description, Last_name) to search on and a query string (lin) | ||
| * | ||
| * TODO #88:BooleanQuery() is deprecated. In future a better solution could be worked out in Query builder layer | ||
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| * @return QueryObject | ||
| * @throws ParseException | ||
| */ | ||
| private Query createQueryObject() throws ParseException { | ||
|
There was a problem hiding this comment. Use an example to explain the purpose of this function. |
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| BooleanQuery booleanQuery = new BooleanQuery(); | ||
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There was a problem hiding this comment. My Intellij IDE shows that "BooleanQuery" is deprecated. |
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| MultiFieldQueryParser parser = new MultiFieldQueryParser(this.fields, this.analyzer); | ||
| for(String searchToken: this.tokens){ | ||
| Query termQuery = parser.parse(searchToken); | ||
| booleanQuery.add(termQuery, BooleanClause.Occur.MUST); | ||
| } | ||
| return booleanQuery; | ||
| } | ||
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| public String getQuery(){ | ||
| return query; | ||
| } | ||
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| public List<Attribute> getAttributeList() { | ||
| return attributeList; | ||
| } | ||
| public Query getQueryObject(){return this.queryObject;} | ||
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| public ArrayList<String> getTokens(){return this.tokens;} | ||
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| public Analyzer getAnalyzer(){ | ||
| return analyzer; | ||
| } | ||
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| } | ||
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Use an example to explain this function.
Does it really "modifies schema"?
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@sandeepreddy602 Please take a look
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It doesn't modifiy the schema.. Will change the comments.
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@sandeepreddy602 and @prakul : was the comment modified accordingly?