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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.query.parser;
import com.yahoo.prelude.query.Item;
import com.yahoo.prelude.query.PhraseItem;
import com.yahoo.search.query.parser.ParserEnvironment;
/**
* Parser for queries of type phrase.
*
* @author Steinar Knutsen
*/
public class PhraseParser extends AbstractParser {
public PhraseParser(ParserEnvironment environment) {
super(environment);
}
@Override
protected Item parseItems() {
return forcedPhrase();
}
/**
* Ignores everything but words and numbers
*
* @return a phrase item if several words/numbers was found, a word item if only one was found
*/
private Item forcedPhrase() {
Item firstWord = null;
PhraseItem phrase = null;
while (tokens.hasNext()) {
Token token = tokens.next();
if (token.kind != Token.Kind.WORD && token.kind != Token.Kind.NUMBER) {
continue;
}
// Note, this depends on segment never creating AndItems when quoted
// (the second argument) is true.
Item newWord = segment(null, token, true);
if (firstWord == null) { // First pass
firstWord = newWord;
} else if (phrase == null) { // Second pass
phrase = new PhraseItem();
phrase.addItem(firstWord);
phrase.addItem(newWord);
} else { // Following passes
phrase.addItem(newWord);
}
}
if (phrase != null) {
return phrase;
} else {
return firstWord;
}
}
}
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