The slop is zero by default, requiring exact matches.*/
- public void setSlop(int s) { slop = s; }
+ public void setSlop(int s) {
+ if (s < 0) {
+ throw new IllegalArgumentException("slop value cannot be negative");
+ }
+ slop = s;
+ }
/** Returns the slop. See setSlop(). */
public int getSlop() { return slop; }
diff --git a/lucene/core/src/test/org/apache/lucene/search/TestMultiPhraseQuery.java b/lucene/core/src/test/org/apache/lucene/search/TestMultiPhraseQuery.java
index f9f56c0202e..392dc6b6c4e 100644
--- a/lucene/core/src/test/org/apache/lucene/search/TestMultiPhraseQuery.java
+++ b/lucene/core/src/test/org/apache/lucene/search/TestMultiPhraseQuery.java
@@ -568,4 +568,16 @@ public class TestMultiPhraseQuery extends LuceneTestCase {
return terms;
}
+ public void testNegativeSlop() throws Exception {
+ MultiPhraseQuery query = new MultiPhraseQuery();
+ query.add(new Term("field", "two"));
+ query.add(new Term("field", "one"));
+ try {
+ query.setSlop(-2);
+ fail("didn't get expected exception");
+ } catch (IllegalArgumentException expected) {
+ // expected exception
+ }
+ }
+
}
diff --git a/lucene/core/src/test/org/apache/lucene/search/TestPhraseQuery.java b/lucene/core/src/test/org/apache/lucene/search/TestPhraseQuery.java
index 0ec884bdd21..a2dbdadc2a9 100644
--- a/lucene/core/src/test/org/apache/lucene/search/TestPhraseQuery.java
+++ b/lucene/core/src/test/org/apache/lucene/search/TestPhraseQuery.java
@@ -678,4 +678,16 @@ public class TestPhraseQuery extends LuceneTestCase {
reader.close();
dir.close();
}
+
+ public void testNegativeSlop() throws Exception {
+ PhraseQuery query = new PhraseQuery();
+ query.add(new Term("field", "two"));
+ query.add(new Term("field", "one"));
+ try {
+ query.setSlop(-2);
+ fail("didn't get expected exception");
+ } catch (IllegalArgumentException expected) {
+ // expected exception
+ }
+ }
}
diff --git a/lucene/queryparser/src/java/org/apache/lucene/queryparser/simple/SimpleQueryParser.java b/lucene/queryparser/src/java/org/apache/lucene/queryparser/simple/SimpleQueryParser.java
index 908c1baf116..49d4c512cb9 100644
--- a/lucene/queryparser/src/java/org/apache/lucene/queryparser/simple/SimpleQueryParser.java
+++ b/lucene/queryparser/src/java/org/apache/lucene/queryparser/simple/SimpleQueryParser.java
@@ -21,10 +21,12 @@ import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
+import org.apache.lucene.search.FuzzyQuery;
import org.apache.lucene.search.MatchAllDocsQuery;
import org.apache.lucene.search.PrefixQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.util.QueryBuilder;
+import org.apache.lucene.util.automaton.LevenshteinAutomata;
import java.util.Collections;
import java.util.Map;
@@ -48,6 +50,8 @@ import java.util.Map;
*
'{@code (}' and '{@code )}' specifies precedence: token1 + (token2 | token3)
*
*
@@ -111,6 +115,11 @@ public class SimpleQueryParser extends QueryBuilder {
public static final int ESCAPE_OPERATOR = 1<<6;
/** Enables {@code WHITESPACE} operators: ' ' '\n' '\r' '\t' */
public static final int WHITESPACE_OPERATOR = 1<<7;
+ /** Enables {@code FUZZY} operators: (~) on single terms */
+ public static final int FUZZY_OPERATOR = 1<<8;
+ /** Enables {@code NEAR} operators: (~) on phrases */
+ public static final int NEAR_OPERATOR = 1<<9;
+
private BooleanClause.Occur defaultOperator = BooleanClause.Occur.SHOULD;
@@ -266,6 +275,7 @@ public class SimpleQueryParser extends QueryBuilder {
int start = ++state.index;
int copied = 0;
boolean escaped = false;
+ boolean hasSlop = false;
while (state.index < state.length) {
if (!escaped) {
@@ -279,10 +289,23 @@ public class SimpleQueryParser extends QueryBuilder {
continue;
} else if (state.data[state.index] == '"') {
- // this should be the end of the phrase
- // all characters found will used for
- // creating the phrase query
- break;
+ // if there are still characters after the closing ", check for a
+ // tilde
+ if (state.length > (state.index + 1) &&
+ state.data[state.index+1] == '~' &&
+ (flags & NEAR_OPERATOR) != 0) {
+ state.index++;
+ // check for characters after the tilde
+ if (state.length > (state.index + 1)) {
+ hasSlop = true;
+ }
+ break;
+ } else {
+ // this should be the end of the phrase
+ // all characters found will used for
+ // creating the phrase query
+ break;
+ }
}
}
@@ -305,7 +328,12 @@ public class SimpleQueryParser extends QueryBuilder {
// a complete phrase has been found and is parsed through
// through the analyzer from the given field
String phrase = new String(state.buffer, 0, copied);
- Query branch = newPhraseQuery(phrase);
+ Query branch;
+ if (hasSlop) {
+ branch = newPhraseQuery(phrase, parseFuzziness(state));
+ } else {
+ branch = newPhraseQuery(phrase, 0);
+ }
buildQueryTree(state, branch);
++state.index;
@@ -316,6 +344,7 @@ public class SimpleQueryParser extends QueryBuilder {
int copied = 0;
boolean escaped = false;
boolean prefix = false;
+ boolean fuzzy = false;
while (state.index < state.length) {
if (!escaped) {
@@ -329,19 +358,14 @@ public class SimpleQueryParser extends QueryBuilder {
++state.index;
continue;
- } else if ((state.data[state.index] == '"' && (flags & PHRASE_OPERATOR) != 0)
- || (state.data[state.index] == '|' && (flags & OR_OPERATOR) != 0)
- || (state.data[state.index] == '+' && (flags & AND_OPERATOR) != 0)
- || (state.data[state.index] == '(' && (flags & PRECEDENCE_OPERATORS) != 0)
- || (state.data[state.index] == ')' && (flags & PRECEDENCE_OPERATORS) != 0)
- || ((state.data[state.index] == ' '
- || state.data[state.index] == '\t'
- || state.data[state.index] == '\n'
- || state.data[state.index] == '\r') && (flags & WHITESPACE_OPERATOR) != 0)) {
+ } else if (tokenFinished(state)) {
// this should be the end of the term
// all characters found will used for
// creating the term query
break;
+ } else if (copied > 0 && state.data[state.index] == '~' && (flags & FUZZY_OPERATOR) != 0) {
+ fuzzy = true;
+ break;
}
// wildcard tracks whether or not the last character
@@ -358,7 +382,17 @@ public class SimpleQueryParser extends QueryBuilder {
if (copied > 0) {
final Query branch;
- if (prefix) {
+ if (fuzzy && (flags & FUZZY_OPERATOR) != 0) {
+ String token = new String(state.buffer, 0, copied);
+ int fuzziness = parseFuzziness(state);
+ // edit distance has a maximum, limit to the maximum supported
+ fuzziness = Math.min(fuzziness, LevenshteinAutomata.MAXIMUM_SUPPORTED_DISTANCE);
+ if (fuzziness == 0) {
+ branch = newDefaultQuery(token);
+ } else {
+ branch = newFuzzyQuery(token, fuzziness);
+ }
+ } else if (prefix) {
// if a term is found with a closing '*' it is considered to be a prefix query
// and will have prefix added as an option
String token = new String(state.buffer, 0, copied - 1);
@@ -420,6 +454,60 @@ public class SimpleQueryParser extends QueryBuilder {
}
}
+ /**
+ * Helper parsing fuzziness from parsing state
+ * @return slop/edit distance, 0 in the case of non-parsing slop/edit string
+ */
+ private int parseFuzziness(State state) {
+ char slopText[] = new char[state.length];
+ int slopLength = 0;
+
+ if (state.data[state.index] == '~') {
+ while (state.index < state.length) {
+ state.index++;
+ // it's possible that the ~ was at the end, so check after incrementing
+ // to make sure we don't go out of bounds
+ if (state.index < state.length) {
+ if (tokenFinished(state)) {
+ break;
+ }
+ slopText[slopLength] = state.data[state.index];
+ slopLength++;
+ }
+ }
+ int fuzziness = 0;
+ try {
+ fuzziness = Integer.parseInt(new String(slopText, 0, slopLength));
+ } catch (NumberFormatException e) {
+ // swallow number format exceptions parsing fuzziness
+ }
+ // negative -> 0
+ if (fuzziness < 0) {
+ fuzziness = 0;
+ }
+ return fuzziness;
+ }
+ return 0;
+ }
+
+ /**
+ * Helper returning true if the state has reached the end of token.
+ */
+ private boolean tokenFinished(State state) {
+ if ((state.data[state.index] == '"' && (flags & PHRASE_OPERATOR) != 0)
+ || (state.data[state.index] == '|' && (flags & OR_OPERATOR) != 0)
+ || (state.data[state.index] == '+' && (flags & AND_OPERATOR) != 0)
+ || (state.data[state.index] == '(' && (flags & PRECEDENCE_OPERATORS) != 0)
+ || (state.data[state.index] == ')' && (flags & PRECEDENCE_OPERATORS) != 0)
+ || ((state.data[state.index] == ' '
+ || state.data[state.index] == '\t'
+ || state.data[state.index] == '\n'
+ || state.data[state.index] == '\r') && (flags & WHITESPACE_OPERATOR) != 0)) {
+ return true;
+ }
+ return false;
+ }
+
/**
* Factory method to generate a standard query (no phrase or prefix operators).
*/
@@ -436,12 +524,27 @@ public class SimpleQueryParser extends QueryBuilder {
}
/**
- * Factory method to generate a phrase query.
+ * Factory method to generate a fuzzy query.
*/
- protected Query newPhraseQuery(String text) {
+ protected Query newFuzzyQuery(String text, int fuzziness) {
BooleanQuery bq = new BooleanQuery(true);
for (Map.Entry entry : weights.entrySet()) {
- Query q = createPhraseQuery(entry.getKey(), text);
+ Query q = new FuzzyQuery(new Term(entry.getKey(), text), fuzziness);
+ if (q != null) {
+ q.setBoost(entry.getValue());
+ bq.add(q, BooleanClause.Occur.SHOULD);
+ }
+ }
+ return simplify(bq);
+ }
+
+ /**
+ * Factory method to generate a phrase query with slop.
+ */
+ protected Query newPhraseQuery(String text, int slop) {
+ BooleanQuery bq = new BooleanQuery(true);
+ for (Map.Entry entry : weights.entrySet()) {
+ Query q = createPhraseQuery(entry.getKey(), text, slop);
if (q != null) {
q.setBoost(entry.getValue());
bq.add(q, BooleanClause.Occur.SHOULD);
diff --git a/lucene/queryparser/src/test/org/apache/lucene/queryparser/simple/TestSimpleQueryParser.java b/lucene/queryparser/src/test/org/apache/lucene/queryparser/simple/TestSimpleQueryParser.java
index 078defbfecc..c852a069296 100644
--- a/lucene/queryparser/src/test/org/apache/lucene/queryparser/simple/TestSimpleQueryParser.java
+++ b/lucene/queryparser/src/test/org/apache/lucene/queryparser/simple/TestSimpleQueryParser.java
@@ -27,6 +27,7 @@ import org.apache.lucene.analysis.MockTokenizer;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.BooleanClause.Occur;
import org.apache.lucene.search.BooleanQuery;
+import org.apache.lucene.search.FuzzyQuery;
import org.apache.lucene.search.MatchAllDocsQuery;
import org.apache.lucene.search.PhraseQuery;
import org.apache.lucene.search.PrefixQuery;
@@ -34,14 +35,17 @@ import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util._TestUtil;
+import org.apache.lucene.util.automaton.LevenshteinAutomata;
import static org.apache.lucene.queryparser.simple.SimpleQueryParser.AND_OPERATOR;
import static org.apache.lucene.queryparser.simple.SimpleQueryParser.ESCAPE_OPERATOR;
+import static org.apache.lucene.queryparser.simple.SimpleQueryParser.FUZZY_OPERATOR;
import static org.apache.lucene.queryparser.simple.SimpleQueryParser.NOT_OPERATOR;
import static org.apache.lucene.queryparser.simple.SimpleQueryParser.OR_OPERATOR;
import static org.apache.lucene.queryparser.simple.SimpleQueryParser.PHRASE_OPERATOR;
import static org.apache.lucene.queryparser.simple.SimpleQueryParser.PRECEDENCE_OPERATORS;
import static org.apache.lucene.queryparser.simple.SimpleQueryParser.PREFIX_OPERATOR;
+import static org.apache.lucene.queryparser.simple.SimpleQueryParser.NEAR_OPERATOR;
import static org.apache.lucene.queryparser.simple.SimpleQueryParser.WHITESPACE_OPERATOR;
/** Tests for {@link SimpleQueryParser} */
@@ -58,6 +62,18 @@ public class TestSimpleQueryParser extends LuceneTestCase {
return parser.parse(text);
}
+ /**
+ * helper to parse a query with whitespace+lowercase analyzer across "field",
+ * with default operator of MUST
+ */
+ private Query parse(String text, int flags) {
+ Analyzer analyzer = new MockAnalyzer(random());
+ SimpleQueryParser parser = new SimpleQueryParser(analyzer,
+ Collections.singletonMap("field", 1f), flags);
+ parser.setDefaultOperator(Occur.MUST);
+ return parser.parse(text);
+ }
+
/** test a simple term */
public void testTerm() throws Exception {
Query expected = new TermQuery(new Term("field", "foobar"));
@@ -65,6 +81,24 @@ public class TestSimpleQueryParser extends LuceneTestCase {
assertEquals(expected, parse("foobar"));
}
+ /** test a fuzzy query */
+ public void testFuzzy() throws Exception {
+ Query regular = new TermQuery(new Term("field", "foobar"));
+ Query expected = new FuzzyQuery(new Term("field", "foobar"), 2);
+
+ assertEquals(expected, parse("foobar~2"));
+ assertEquals(regular, parse("foobar~"));
+ assertEquals(regular, parse("foobar~a"));
+ assertEquals(regular, parse("foobar~1a"));
+
+ BooleanQuery bool = new BooleanQuery();
+ FuzzyQuery fuzzy = new FuzzyQuery(new Term("field", "foo"), LevenshteinAutomata.MAXIMUM_SUPPORTED_DISTANCE);
+ bool.add(fuzzy, Occur.MUST);
+ bool.add(new TermQuery(new Term("field", "bar")), Occur.MUST);
+
+ assertEquals(bool, parse("foo~" + LevenshteinAutomata.MAXIMUM_SUPPORTED_DISTANCE + 1 + " bar"));
+ }
+
/** test a simple phrase */
public void testPhrase() throws Exception {
PhraseQuery expected = new PhraseQuery();
@@ -74,6 +108,43 @@ public class TestSimpleQueryParser extends LuceneTestCase {
assertEquals(expected, parse("\"foo bar\""));
}
+ /** test a simple phrase with various slop settings */
+ public void testPhraseWithSlop() throws Exception {
+ PhraseQuery expectedWithSlop = new PhraseQuery();
+ expectedWithSlop.add(new Term("field", "foo"));
+ expectedWithSlop.add(new Term("field", "bar"));
+ expectedWithSlop.setSlop(2);
+
+ assertEquals(expectedWithSlop, parse("\"foo bar\"~2"));
+
+ PhraseQuery expectedWithMultiDigitSlop = new PhraseQuery();
+ expectedWithMultiDigitSlop.add(new Term("field", "foo"));
+ expectedWithMultiDigitSlop.add(new Term("field", "bar"));
+ expectedWithMultiDigitSlop.setSlop(10);
+
+ assertEquals(expectedWithMultiDigitSlop, parse("\"foo bar\"~10"));
+
+ PhraseQuery expectedNoSlop = new PhraseQuery();
+ expectedNoSlop.add(new Term("field", "foo"));
+ expectedNoSlop.add(new Term("field", "bar"));
+
+ assertEquals("Ignore trailing tilde with no slop", expectedNoSlop, parse("\"foo bar\"~"));
+ assertEquals("Ignore non-numeric trailing slop", expectedNoSlop, parse("\"foo bar\"~a"));
+ assertEquals("Ignore non-numeric trailing slop", expectedNoSlop, parse("\"foo bar\"~1a"));
+ assertEquals("Ignore negative trailing slop", expectedNoSlop, parse("\"foo bar\"~-1"));
+
+ PhraseQuery pq = new PhraseQuery();
+ pq.add(new Term("field", "foo"));
+ pq.add(new Term("field", "bar"));
+ pq.setSlop(12);
+
+ BooleanQuery expectedBoolean = new BooleanQuery();
+ expectedBoolean.add(pq, Occur.MUST);
+ expectedBoolean.add(new TermQuery(new Term("field", "baz")), Occur.MUST);
+
+ assertEquals(expectedBoolean, parse("\"foo bar\"~12 baz"));
+ }
+
/** test a simple prefix */
public void testPrefix() throws Exception {
PrefixQuery expected = new PrefixQuery(new Term("field", "foobar"));
@@ -533,17 +604,33 @@ public class TestSimpleQueryParser extends LuceneTestCase {
assertEquals(expected, parseKeyword("\t\tfoo foo foo", ~WHITESPACE_OPERATOR));
}
+ public void testDisableFuzziness() {
+ Query expected = new TermQuery(new Term("field", "foo~1"));
+ assertEquals(expected, parseKeyword("foo~1", ~FUZZY_OPERATOR));
+ }
+
+ public void testDisableSlop() {
+ PhraseQuery expectedPhrase = new PhraseQuery();
+ expectedPhrase.add(new Term("field", "foo"));
+ expectedPhrase.add(new Term("field", "bar"));
+
+ BooleanQuery expected = new BooleanQuery();
+ expected.add(expectedPhrase, Occur.MUST);
+ expected.add(new TermQuery(new Term("field", "~2")), Occur.MUST);
+ assertEquals(expected, parse("\"foo bar\"~2", ~NEAR_OPERATOR));
+ }
+
// we aren't supposed to barf on any input...
public void testRandomQueries() throws Exception {
for (int i = 0; i < 1000; i++) {
String query = _TestUtil.randomUnicodeString(random());
parse(query); // no exception
- parseKeyword(query, _TestUtil.nextInt(random(), 0, 256)); // no exception
+ parseKeyword(query, _TestUtil.nextInt(random(), 0, 1024)); // no exception
}
}
public void testRandomQueries2() throws Exception {
- char chars[] = new char[] { 'a', '1', '|', '&', ' ', '(', ')', '"', '-' };
+ char chars[] = new char[] { 'a', '1', '|', '&', ' ', '(', ')', '"', '-', '~'};
StringBuilder sb = new StringBuilder();
for (int i = 0; i < 1000; i++) {
sb.setLength(0);
@@ -552,7 +639,7 @@ public class TestSimpleQueryParser extends LuceneTestCase {
sb.append(chars[random().nextInt(chars.length)]);
}
parse(sb.toString()); // no exception
- parseKeyword(sb.toString(), _TestUtil.nextInt(random(), 0, 256)); // no exception
+ parseKeyword(sb.toString(), _TestUtil.nextInt(random(), 0, 1024)); // no exception
}
}
}
\ No newline at end of file
diff --git a/solr/core/src/java/org/apache/solr/search/SimpleQParserPlugin.java b/solr/core/src/java/org/apache/solr/search/SimpleQParserPlugin.java
index cc75ace4bf2..db8b822804a 100644
--- a/solr/core/src/java/org/apache/solr/search/SimpleQParserPlugin.java
+++ b/solr/core/src/java/org/apache/solr/search/SimpleQParserPlugin.java
@@ -18,11 +18,9 @@ package org.apache.solr.search;
*/
import org.apache.lucene.analysis.Analyzer;
-import org.apache.lucene.index.Term;
import org.apache.lucene.queryparser.simple.SimpleQueryParser;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
-import org.apache.lucene.search.PrefixQuery;
import org.apache.lucene.search.Query;
import org.apache.solr.common.params.CommonParams;
import org.apache.solr.common.params.SimpleParams;
@@ -73,36 +71,21 @@ public class SimpleQParserPlugin extends QParserPlugin {
/** The name that can be used to specify this plugin should be used to parse the query. */
public static String NAME = "simple";
- /** Enables {@code AND} operator (+) */
- private static final String AND_OPERATOR = "AND";
- /** Enables {@code NOT} operator (-) */
- private static final String NOT_OPERATOR = "NOT";
- /** Enables {@code OR} operator (|) */
- private static final String OR_OPERATOR = "OR";
- /** Enables {@code PREFIX} operator (*) */
- private static final String PREFIX_OPERATOR = "PREFIX";
- /** Enables {@code PHRASE} operator (") */
- private static final String PHRASE_OPERATOR = "PHRASE";
- /** Enables {@code PRECEDENCE} operators: {@code (} and {@code )} */
- private static final String PRECEDENCE_OPERATORS = "PRECEDENCE";
- /** Enables {@code ESCAPE} operator (\) */
- private static final String ESCAPE_OPERATOR = "ESCAPE";
- /** Enables {@code WHITESPACE} operators: ' ' '\n' '\r' '\t' */
- private static final String WHITESPACE_OPERATOR = "WHITESPACE";
-
/** Map of string operators to their int counterparts in SimpleQueryParser. */
private static final Map OPERATORS = new HashMap();
/* Setup the map of possible operators. */
static {
- OPERATORS.put(AND_OPERATOR, SimpleQueryParser.AND_OPERATOR);
- OPERATORS.put(NOT_OPERATOR, SimpleQueryParser.NOT_OPERATOR);
- OPERATORS.put(OR_OPERATOR, SimpleQueryParser.OR_OPERATOR);
- OPERATORS.put(PREFIX_OPERATOR, SimpleQueryParser.PREFIX_OPERATOR);
- OPERATORS.put(PHRASE_OPERATOR, SimpleQueryParser.PHRASE_OPERATOR);
- OPERATORS.put(PRECEDENCE_OPERATORS, SimpleQueryParser.PRECEDENCE_OPERATORS);
- OPERATORS.put(ESCAPE_OPERATOR, SimpleQueryParser.ESCAPE_OPERATOR);
- OPERATORS.put(WHITESPACE_OPERATOR, SimpleQueryParser.WHITESPACE_OPERATOR);
+ OPERATORS.put(SimpleParams.AND_OPERATOR, SimpleQueryParser.AND_OPERATOR);
+ OPERATORS.put(SimpleParams.NOT_OPERATOR, SimpleQueryParser.NOT_OPERATOR);
+ OPERATORS.put(SimpleParams.OR_OPERATOR, SimpleQueryParser.OR_OPERATOR);
+ OPERATORS.put(SimpleParams.PREFIX_OPERATOR, SimpleQueryParser.PREFIX_OPERATOR);
+ OPERATORS.put(SimpleParams.PHRASE_OPERATOR, SimpleQueryParser.PHRASE_OPERATOR);
+ OPERATORS.put(SimpleParams.PRECEDENCE_OPERATORS, SimpleQueryParser.PRECEDENCE_OPERATORS);
+ OPERATORS.put(SimpleParams.ESCAPE_OPERATOR, SimpleQueryParser.ESCAPE_OPERATOR);
+ OPERATORS.put(SimpleParams.WHITESPACE_OPERATOR, SimpleQueryParser.WHITESPACE_OPERATOR);
+ OPERATORS.put(SimpleParams.FUZZY_OPERATOR, SimpleQueryParser.FUZZY_OPERATOR);
+ OPERATORS.put(SimpleParams.NEAR_OPERATOR, SimpleQueryParser.NEAR_OPERATOR);
}
/** No initialization is necessary so this method is empty. */
diff --git a/solr/solrj/src/java/org/apache/solr/common/params/SimpleParams.java b/solr/solrj/src/java/org/apache/solr/common/params/SimpleParams.java
index 1fd89030f30..e7704027b5e 100644
--- a/solr/solrj/src/java/org/apache/solr/common/params/SimpleParams.java
+++ b/solr/solrj/src/java/org/apache/solr/common/params/SimpleParams.java
@@ -26,4 +26,25 @@ public interface SimpleParams {
/** Override the currently enabled/disabled query operators. */
public static String QO = "q.operators";
+
+ /** Enables {@code AND} operator (+) */
+ public static final String AND_OPERATOR = "AND";
+ /** Enables {@code NOT} operator (-) */
+ public static final String NOT_OPERATOR = "NOT";
+ /** Enables {@code OR} operator (|) */
+ public static final String OR_OPERATOR = "OR";
+ /** Enables {@code PREFIX} operator (*) */
+ public static final String PREFIX_OPERATOR = "PREFIX";
+ /** Enables {@code PHRASE} operator (") */
+ public static final String PHRASE_OPERATOR = "PHRASE";
+ /** Enables {@code PRECEDENCE} operators: {@code (} and {@code )} */
+ public static final String PRECEDENCE_OPERATORS = "PRECEDENCE";
+ /** Enables {@code ESCAPE} operator (\) */
+ public static final String ESCAPE_OPERATOR = "ESCAPE";
+ /** Enables {@code WHITESPACE} operators: ' ' '\n' '\r' '\t' */
+ public static final String WHITESPACE_OPERATOR = "WHITESPACE";
+ /** Enables {@code FUZZY} operator (~) */
+ public static final String FUZZY_OPERATOR = "FUZZY";
+ /** Enables {@code NEAR} operator (~) */
+ public static final String NEAR_OPERATOR = "NEAR";
}