Source Code Cross Referenced for SpanFirstQuery.java in  » Net » lucene-connector » org » apache » lucene » search » spans » 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.spans 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.apache.lucene.search.spans;
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:        import java.util.Collection;
023:        import java.util.Set;
024:
025:        import org.apache.lucene.index.IndexReader;
026:        import org.apache.lucene.search.Query;
027:        import org.apache.lucene.util.ToStringUtils;
028:
029:        /** Matches spans near the beginning of a field. */
030:        public class SpanFirstQuery extends SpanQuery {
031:            private SpanQuery match;
032:            private int end;
033:
034:            /** Construct a SpanFirstQuery matching spans in <code>match</code> whose end
035:             * position is less than or equal to <code>end</code>. */
036:            public SpanFirstQuery(SpanQuery match, int end) {
037:                this .match = match;
038:                this .end = end;
039:            }
040:
041:            /** Return the SpanQuery whose matches are filtered. */
042:            public SpanQuery getMatch() {
043:                return match;
044:            }
045:
046:            /** Return the maximum end position permitted in a match. */
047:            public int getEnd() {
048:                return end;
049:            }
050:
051:            public String getField() {
052:                return match.getField();
053:            }
054:
055:            /** Returns a collection of all terms matched by this query.
056:             * @deprecated use extractTerms instead
057:             * @see #extractTerms(Set)
058:             */
059:            public Collection getTerms() {
060:                return match.getTerms();
061:            }
062:
063:            public String toString(String field) {
064:                StringBuffer buffer = new StringBuffer();
065:                buffer.append("spanFirst(");
066:                buffer.append(match.toString(field));
067:                buffer.append(", ");
068:                buffer.append(end);
069:                buffer.append(")");
070:                buffer.append(ToStringUtils.boost(getBoost()));
071:                return buffer.toString();
072:            }
073:
074:            public void extractTerms(Set terms) {
075:                match.extractTerms(terms);
076:            }
077:
078:            public Spans getSpans(final IndexReader reader) throws IOException {
079:                return new Spans() {
080:                    private Spans spans = match.getSpans(reader);
081:
082:                    public boolean next() throws IOException {
083:                        while (spans.next()) { // scan to next match
084:                            if (end() <= end)
085:                                return true;
086:                        }
087:                        return false;
088:                    }
089:
090:                    public boolean skipTo(int target) throws IOException {
091:                        if (!spans.skipTo(target))
092:                            return false;
093:
094:                        if (spans.end() <= end) // there is a match
095:                            return true;
096:
097:                        return next(); // scan to next match
098:                    }
099:
100:                    public int doc() {
101:                        return spans.doc();
102:                    }
103:
104:                    public int start() {
105:                        return spans.start();
106:                    }
107:
108:                    public int end() {
109:                        return spans.end();
110:                    }
111:
112:                    public String toString() {
113:                        return "spans(" + SpanFirstQuery.this .toString() + ")";
114:                    }
115:
116:                };
117:            }
118:
119:            public Query rewrite(IndexReader reader) throws IOException {
120:                SpanFirstQuery clone = null;
121:
122:                SpanQuery rewritten = (SpanQuery) match.rewrite(reader);
123:                if (rewritten != match) {
124:                    clone = (SpanFirstQuery) this .clone();
125:                    clone.match = rewritten;
126:                }
127:
128:                if (clone != null) {
129:                    return clone; // some clauses rewrote
130:                } else {
131:                    return this ; // no clauses rewrote
132:                }
133:            }
134:
135:            public boolean equals(Object o) {
136:                if (this  == o)
137:                    return true;
138:                if (!(o instanceof  SpanFirstQuery))
139:                    return false;
140:
141:                SpanFirstQuery other = (SpanFirstQuery) o;
142:                return this .end == other.end && this .match.equals(other.match)
143:                        && this .getBoost() == other.getBoost();
144:            }
145:
146:            public int hashCode() {
147:                int h = match.hashCode();
148:                h ^= (h << 8) | (h >>> 25); // reversible
149:                h ^= Float.floatToRawIntBits(getBoost()) ^ end;
150:                return h;
151:            }
152:
153:        }
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