+++ /dev/null
-package org.apache.lucene.search;
-
-/**
- * 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.
- */
-
-import java.io.IOException;
-import java.text.Collator;
-
-import org.apache.lucene.index.IndexReader;
-import org.apache.lucene.index.Term;
-import org.apache.lucene.util.StringHelper;
-
-/**
- * Subclass of FilteredTermEnum for enumerating all terms that match the
- * specified range parameters.
- * <p>
- * Term enumerations are always ordered by Term.compareTo(). Each term in
- * the enumeration is greater than all that precede it.
- * @since 2.9
- */
-public class TermRangeTermEnum extends FilteredTermEnum {
-
- private Collator collator = null;
- private boolean endEnum = false;
- private String field;
- private String upperTermText;
- private String lowerTermText;
- private boolean includeLower;
- private boolean includeUpper;
-
- /**
- * Enumerates all terms greater/equal than <code>lowerTerm</code>
- * but less/equal than <code>upperTerm</code>.
- *
- * If an endpoint is null, it is said to be "open". Either or both
- * endpoints may be open. Open endpoints may not be exclusive
- * (you can't select all but the first or last term without
- * explicitly specifying the term to exclude.)
- *
- * @param reader
- * @param field
- * An interned field that holds both lower and upper terms.
- * @param lowerTermText
- * The term text at the lower end of the range
- * @param upperTermText
- * The term text at the upper end of the range
- * @param includeLower
- * If true, the <code>lowerTerm</code> is included in the range.
- * @param includeUpper
- * If true, the <code>upperTerm</code> is included in the range.
- * @param collator
- * The collator to use to collate index Terms, to determine their
- * membership in the range bounded by <code>lowerTerm</code> and
- * <code>upperTerm</code>.
- *
- * @throws IOException
- */
- public TermRangeTermEnum(IndexReader reader, String field, String lowerTermText, String upperTermText,
- boolean includeLower, boolean includeUpper, Collator collator) throws IOException {
- this.collator = collator;
- this.upperTermText = upperTermText;
- this.lowerTermText = lowerTermText;
- this.includeLower = includeLower;
- this.includeUpper = includeUpper;
- this.field = StringHelper.intern(field);
-
- // do a little bit of normalization...
- // open ended range queries should always be inclusive.
- if (this.lowerTermText == null) {
- this.lowerTermText = "";
- this.includeLower = true;
- }
-
- if (this.upperTermText == null) {
- this.includeUpper = true;
- }
-
- String startTermText = collator == null ? this.lowerTermText : "";
- setEnum(reader.terms(new Term(this.field, startTermText)));
- }
-
- @Override
- public float difference() {
- return 1.0f;
- }
-
- @Override
- protected boolean endEnum() {
- return endEnum;
- }
-
- @Override
- protected boolean termCompare(Term term) {
- if (collator == null) {
- // Use Unicode code point ordering
- boolean checkLower = false;
- if (!includeLower) // make adjustments to set to exclusive
- checkLower = true;
- if (term != null && term.field() == field) { // interned comparison
- if (!checkLower || null==lowerTermText || term.text().compareTo(lowerTermText) > 0) {
- checkLower = false;
- if (upperTermText != null) {
- int compare = upperTermText.compareTo(term.text());
- /*
- * if beyond the upper term, or is exclusive and this is equal to
- * the upper term, break out
- */
- if ((compare < 0) ||
- (!includeUpper && compare==0)) {
- endEnum = true;
- return false;
- }
- }
- return true;
- }
- } else {
- // break
- endEnum = true;
- return false;
- }
- return false;
- } else {
- if (term != null && term.field() == field) { // interned comparison
- if ((lowerTermText == null
- || (includeLower
- ? collator.compare(term.text(), lowerTermText) >= 0
- : collator.compare(term.text(), lowerTermText) > 0))
- && (upperTermText == null
- || (includeUpper
- ? collator.compare(term.text(), upperTermText) <= 0
- : collator.compare(term.text(), upperTermText) < 0))) {
- return true;
- }
- return false;
- }
- endEnum = true;
- return false;
- }
- }
-}
fnp / pylucene.git / blobdiff