| package org.apache.lucene.index; |
| |
| /* ==================================================================== |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2001 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Apache" and "Apache Software Foundation" and |
| * "Apache Lucene" must not be used to endorse or promote products |
| * derived from this software without prior written permission. For |
| * written permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * "Apache Lucene", nor may "Apache" appear in their name, without |
| * prior written permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| |
| /** |
| A Term represents a word from text. This is the unit of search. It is |
| composed of two elements, the text of the word, as a string, and the name of |
| the field that the text occured in, an interned string. |
| |
| Note that terms may represent more than words from text fields, but also |
| things like dates, email addresses, urls, etc. */ |
| |
| public final class Term { |
| String field; |
| String text; |
| |
| /** Constructs a Term with the given field and text. */ |
| public Term(String fld, String txt) { |
| this(fld, txt, true); |
| } |
| Term(String fld, String txt, boolean intern) { |
| field = intern ? fld.intern() : fld; // field names are interned |
| text = txt; // unless already known to be |
| } |
| |
| /** Returns the field of this term, an interned string. The field indicates |
| the part of a document which this term came from. */ |
| public final String field() { return field; } |
| |
| /** Returns the text of this term. In the case of words, this is simply the |
| text of the word. In the case of dates and other types, this is an |
| encoding of the object as a string. */ |
| public final String text() { return text; } |
| |
| /** Compares two terms, returning true iff they have the same |
| field and text. */ |
| public final boolean equals(Object o) { |
| if (o == null) |
| return false; |
| Term other = (Term)o; |
| return field == other.field && text.equals(other.text); |
| } |
| |
| /** Combines the hashCode() of the field and the text. */ |
| public final int hashCode() { |
| return field.hashCode() + text.hashCode(); |
| } |
| |
| /** Compares two terms, returning an integer which is less than zero iff this |
| term belongs after the argument, equal zero iff this term is equal to the |
| argument, and greater than zero iff this term belongs after the argument. |
| |
| The ordering of terms is first by field, then by text.*/ |
| public final int compareTo(Term other) { |
| if (field == other.field) // fields are interned |
| return text.compareTo(other.text); |
| else |
| return field.compareTo(other.field); |
| } |
| |
| /** Resets the field and text of a Term. */ |
| final void set(String fld, String txt) { |
| field = fld; |
| text = txt; |
| } |
| |
| public final String toString() { |
| return "Term<" + field + ":" + text + ">"; |
| } |
| } |