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


001:        package org.apache.lucene.index;
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:        /**
021:         A Term represents a word from text.  This is the unit of search.  It is
022:         composed of two elements, the text of the word, as a string, and the name of
023:         the field that the text occured in, an interned string.
024:
025:         Note that terms may represent more than words from text fields, but also
026:         things like dates, email addresses, urls, etc.  */
027:
028:        public final class Term implements  Comparable, java.io.Serializable {
029:            String field;
030:            String text;
031:
032:            /** Constructs a Term with the given field and text.
033:             * <p>Note that a null field or null text value results in undefined
034:             * behavior for most Lucene APIs that accept a Term parameter. */
035:            public Term(String fld, String txt) {
036:                this (fld, txt, true);
037:            }
038:
039:            Term(String fld, String txt, boolean intern) {
040:                field = intern ? fld.intern() : fld; // field names are interned
041:                text = txt; // unless already known to be
042:            }
043:
044:            /** Returns the field of this term, an interned string.   The field indicates
045:              the part of a document which this term came from. */
046:            public final String field() {
047:                return field;
048:            }
049:
050:            /** Returns the text of this term.  In the case of words, this is simply the
051:              text of the word.  In the case of dates and other types, this is an
052:              encoding of the object as a string.  */
053:            public final String text() {
054:                return text;
055:            }
056:
057:            /**
058:             * Optimized construction of new Terms by reusing same field as this Term
059:             * - avoids field.intern() overhead 
060:             * @param text The text of the new term (field is implicitly same as this Term instance)
061:             * @return A new Term
062:             */
063:            public Term createTerm(String text) {
064:                return new Term(field, text, false);
065:            }
066:
067:            /** Compares two terms, returning true iff they have the same
068:                field and text. */
069:            public final boolean equals(Object o) {
070:                if (o == this )
071:                    return true;
072:                if (o == null)
073:                    return false;
074:                if (!(o instanceof  Term))
075:                    return false;
076:                Term other = (Term) o;
077:                return field == other.field && text.equals(other.text);
078:            }
079:
080:            /** Combines the hashCode() of the field and the text. */
081:            public final int hashCode() {
082:                return field.hashCode() + text.hashCode();
083:            }
084:
085:            public int compareTo(Object other) {
086:                return compareTo((Term) other);
087:            }
088:
089:            /** Compares two terms, returning a negative integer if this
090:              term belongs before the argument, zero if this term is equal to the
091:              argument, and a positive integer if this term belongs after the argument.
092:
093:              The ordering of terms is first by field, then by text.*/
094:            public final int compareTo(Term other) {
095:                if (field == other.field) // fields are interned
096:                    return text.compareTo(other.text);
097:                else
098:                    return field.compareTo(other.field);
099:            }
100:
101:            /** Resets the field and text of a Term. */
102:            final void set(String fld, String txt) {
103:                field = fld;
104:                text = txt;
105:            }
106:
107:            public final String toString() {
108:                return field + ":" + text;
109:            }
110:
111:            private void readObject(java.io.ObjectInputStream in)
112:                    throws java.io.IOException, ClassNotFoundException {
113:                in.defaultReadObject();
114:                field = field.intern();
115:            }
116:        }
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