Source Code Cross Referenced for ReqExclScorer.java in  » Net » lucene-connector » org » apache » lucene » search » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » lucene connector » org.apache.lucene.search 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.apache.lucene.search;
002:
003:        /**
004:         * Licensed to the Apache Software Foundation (ASF) under one or more
005:         * contributor license agreements.  See the NOTICE file distributed with
006:         * this work for additional information regarding copyright ownership.
007:         * The ASF licenses this file to You under the Apache License, Version 2.0
008:         * (the "License"); you may not use this file except in compliance with
009:         * the License.  You may obtain a copy of the License at
010:         *
011:         *     http://www.apache.org/licenses/LICENSE-2.0
012:         *
013:         * Unless required by applicable law or agreed to in writing, software
014:         * distributed under the License is distributed on an "AS IS" BASIS,
015:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016:         * See the License for the specific language governing permissions and
017:         * limitations under the License.
018:         */
019:
020:        import java.io.IOException;
021:
022:        /** A Scorer for queries with a required subscorer and an excluding (prohibited) subscorer.
023:         * <br>
024:         * This <code>Scorer</code> implements {@link Scorer#skipTo(int)},
025:         * and it uses the skipTo() on the given scorers.
026:         */
027:        public class ReqExclScorer extends Scorer {
028:            private Scorer reqScorer, exclScorer;
029:
030:            /** Construct a <code>ReqExclScorer</code>.
031:             * @param reqScorer The scorer that must match, except where
032:             * @param exclScorer indicates exclusion.
033:             */
034:            public ReqExclScorer(Scorer reqScorer, Scorer exclScorer) {
035:                super (null); // No similarity used.
036:                this .reqScorer = reqScorer;
037:                this .exclScorer = exclScorer;
038:            }
039:
040:            private boolean firstTime = true;
041:
042:            public boolean next() throws IOException {
043:                if (firstTime) {
044:                    if (!exclScorer.next()) {
045:                        exclScorer = null; // exhausted at start
046:                    }
047:                    firstTime = false;
048:                }
049:                if (reqScorer == null) {
050:                    return false;
051:                }
052:                if (!reqScorer.next()) {
053:                    reqScorer = null; // exhausted, nothing left
054:                    return false;
055:                }
056:                if (exclScorer == null) {
057:                    return true; // reqScorer.next() already returned true
058:                }
059:                return toNonExcluded();
060:            }
061:
062:            /** Advance to non excluded doc.
063:             * <br>On entry:
064:             * <ul>
065:             * <li>reqScorer != null,
066:             * <li>exclScorer != null,
067:             * <li>reqScorer was advanced once via next() or skipTo()
068:             *      and reqScorer.doc() may still be excluded.
069:             * </ul>
070:             * Advances reqScorer a non excluded required doc, if any.
071:             * @return true iff there is a non excluded required doc.
072:             */
073:            private boolean toNonExcluded() throws IOException {
074:                int exclDoc = exclScorer.doc();
075:                do {
076:                    int reqDoc = reqScorer.doc(); // may be excluded
077:                    if (reqDoc < exclDoc) {
078:                        return true; // reqScorer advanced to before exclScorer, ie. not excluded
079:                    } else if (reqDoc > exclDoc) {
080:                        if (!exclScorer.skipTo(reqDoc)) {
081:                            exclScorer = null; // exhausted, no more exclusions
082:                            return true;
083:                        }
084:                        exclDoc = exclScorer.doc();
085:                        if (exclDoc > reqDoc) {
086:                            return true; // not excluded
087:                        }
088:                    }
089:                } while (reqScorer.next());
090:                reqScorer = null; // exhausted, nothing left
091:                return false;
092:            }
093:
094:            public int doc() {
095:                return reqScorer.doc(); // reqScorer may be null when next() or skipTo() already return false
096:            }
097:
098:            /** Returns the score of the current document matching the query.
099:             * Initially invalid, until {@link #next()} is called the first time.
100:             * @return The score of the required scorer.
101:             */
102:            public float score() throws IOException {
103:                return reqScorer.score(); // reqScorer may be null when next() or skipTo() already return false
104:            }
105:
106:            /** Skips to the first match beyond the current whose document number is
107:             * greater than or equal to a given target.
108:             * <br>When this method is used the {@link #explain(int)} method should not be used.
109:             * @param target The target document number.
110:             * @return true iff there is such a match.
111:             */
112:            public boolean skipTo(int target) throws IOException {
113:                if (firstTime) {
114:                    firstTime = false;
115:                    if (!exclScorer.skipTo(target)) {
116:                        exclScorer = null; // exhausted
117:                    }
118:                }
119:                if (reqScorer == null) {
120:                    return false;
121:                }
122:                if (exclScorer == null) {
123:                    return reqScorer.skipTo(target);
124:                }
125:                if (!reqScorer.skipTo(target)) {
126:                    reqScorer = null;
127:                    return false;
128:                }
129:                return toNonExcluded();
130:            }
131:
132:            public Explanation explain(int doc) throws IOException {
133:                Explanation res = new Explanation();
134:                if (exclScorer.skipTo(doc) && (exclScorer.doc() == doc)) {
135:                    res.setDescription("excluded");
136:                } else {
137:                    res.setDescription("not excluded");
138:                    res.addDetail(reqScorer.explain(doc));
139:                }
140:                return res;
141:            }
142:        }
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