Source Code Cross Referenced for SqlEnum.java in  » Database-ORM » Torque » org » apache » torque » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database ORM » Torque » org.apache.torque.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.apache.torque.util;
002:
003:        /*
004:         * Licensed to the Apache Software Foundation (ASF) under one
005:         * or more contributor license agreements.  See the NOTICE file
006:         * distributed with this work for additional information
007:         * regarding copyright ownership.  The ASF licenses this file
008:         * to you under the Apache License, Version 2.0 (the
009:         * "License"); you may not use this file except in compliance
010:         * with the License.  You may obtain a copy of the License at
011:         *
012:         *   http://www.apache.org/licenses/LICENSE-2.0
013:         *
014:         * Unless required by applicable law or agreed to in writing,
015:         * software distributed under the License is distributed on an
016:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017:         * KIND, either express or implied.  See the License for the
018:         * specific language governing permissions and limitations
019:         * under the License.
020:         */
021:
022:        /**
023:         * A typesafe enum of SQL string fragments.  Used by Criteria and SqlExpression
024:         * to build queries.  Criteria also makes most of the constants available
025:         * in order to specify a criterion.
026:         *
027:         * @author <a href="mailto:jmcnally@collab.net"></a>
028:         * @author <a href="mailto:fischer@seitenbau.de">Thomas Fischer</a>
029:         * @version $Id: SqlEnum.java 473821 2006-11-11 22:37:25Z tv $
030:         * @since 3.0
031:         */
032:        public class SqlEnum implements  java.io.Serializable {
033:            /**
034:             * Serial version
035:             */
036:            private static final long serialVersionUID = 5963149836513364800L;
037:
038:            private final String s;
039:
040:            private SqlEnum(String s) {
041:                this .s = s;
042:            }
043:
044:            public final String toString() {
045:                return s;
046:            }
047:
048:            public static final SqlEnum EQUAL = new SqlEnum("=");
049:            public static final SqlEnum NOT_EQUAL = new SqlEnum("<>");
050:            public static final SqlEnum ALT_NOT_EQUAL = new SqlEnum("!=");
051:            public static final SqlEnum GREATER_THAN = new SqlEnum(">");
052:            public static final SqlEnum LESS_THAN = new SqlEnum("<");
053:            public static final SqlEnum GREATER_EQUAL = new SqlEnum(">=");
054:            public static final SqlEnum LESS_EQUAL = new SqlEnum("<=");
055:            public static final SqlEnum LIKE = new SqlEnum(" LIKE ");
056:            public static final SqlEnum NOT_LIKE = new SqlEnum(" NOT LIKE ");
057:            public static final SqlEnum ILIKE = new SqlEnum(" ILIKE ");
058:            public static final SqlEnum NOT_ILIKE = new SqlEnum(" NOT ILIKE ");
059:            public static final SqlEnum IN = new SqlEnum(" IN ");
060:            public static final SqlEnum NOT_IN = new SqlEnum(" NOT IN ");
061:            public static final SqlEnum CUSTOM = new SqlEnum("CUSTOM");
062:            public static final SqlEnum JOIN = new SqlEnum("JOIN");
063:            public static final SqlEnum DISTINCT = new SqlEnum("DISTINCT ");
064:            public static final SqlEnum ALL = new SqlEnum("ALL ");
065:            public static final SqlEnum ASC = new SqlEnum("ASC");
066:            public static final SqlEnum DESC = new SqlEnum("DESC");
067:            public static final SqlEnum ISNULL = new SqlEnum(" IS NULL ");
068:            public static final SqlEnum ISNOTNULL = new SqlEnum(" IS NOT NULL ");
069:            public static final SqlEnum CURRENT_DATE = new SqlEnum(
070:                    "CURRENT_DATE");
071:            public static final SqlEnum CURRENT_TIME = new SqlEnum(
072:                    "CURRENT_TIME");
073:            public static final SqlEnum LEFT_JOIN = new SqlEnum(" LEFT JOIN ");
074:            public static final SqlEnum RIGHT_JOIN = new SqlEnum(" RIGHT JOIN ");
075:            public static final SqlEnum INNER_JOIN = new SqlEnum(" INNER JOIN ");
076:            public static final SqlEnum ON = new SqlEnum(" ON ");
077:            public static final SqlEnum AS = new SqlEnum(" AS ");
078:            public static final SqlEnum ESCAPE = new SqlEnum(" ESCAPE ");
079:
080:            /**
081:             * returns whether o is the same SqlEnum as this object.
082:             * Two SqlEnums are considered equal if they contain the same String.
083:             * @param o the object to compare the SqlEnum with.
084:             */
085:            public boolean equals(Object o) {
086:                if (o == null) {
087:                    return false;
088:                }
089:
090:                if (!(o instanceof  SqlEnum)) {
091:                    return false;
092:                }
093:
094:                SqlEnum otherEnum = (SqlEnum) o;
095:
096:                // both null: true
097:                // other null, this not null: false
098:                // else compare
099:                return (otherEnum.s == null) ? (s == null) : otherEnum.s
100:                        .equals(s);
101:            }
102:
103:            /**
104:             * returns a hashcode for this object which is consistent with equals()
105:             */
106:            public int hashCode() {
107:                return (s == null) ? 0 : s.hashCode();
108:            }
109:        }
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