| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.empire.dbms.postgresql; |
| |
| import java.util.Set; |
| |
| import org.apache.empire.commons.ObjectUtils; |
| import org.apache.empire.db.DBColumn; |
| import org.apache.empire.db.DBColumnExpr; |
| import org.apache.empire.db.DBCommand; |
| import org.apache.empire.db.DBDatabase; |
| import org.apache.empire.db.DBSQLBuilder; |
| import org.apache.empire.db.expr.compare.DBCompareExpr; |
| |
| /** |
| * PostgresAtAt |
| * create a Postgres @@ comparator |
| */ |
| public class PostgresAtAt extends DBCompareExpr |
| { |
| private final DBColumnExpr left; |
| private final DBColumnExpr right; |
| |
| public PostgresAtAt(DBColumnExpr left, DBColumnExpr right) |
| { |
| this.left = left; |
| this.right = right; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public DBDatabase getDatabase() |
| { |
| return this.left.getDatabase(); |
| } |
| |
| @Override |
| public void prepareCommand(DBCommand cmd) |
| { |
| /* nothing */ |
| } |
| |
| @Override |
| public DBCompareExpr copy(DBCommand newCmd) |
| { |
| return new PostgresAtAt(this.left, this.right); |
| } |
| |
| @Override |
| public boolean isMutuallyExclusive(DBCompareExpr other) |
| { |
| if (ObjectUtils.isWrapper(other)) |
| { // unwrap |
| other = ObjectUtils.unwrap(other); |
| } |
| if (other instanceof PostgresAtAt) |
| { // compare |
| PostgresAtAt otherAtAt = (PostgresAtAt)other; |
| return this.left.equals(otherAtAt.left) && |
| this.right.equals(otherAtAt.right); |
| } |
| return false; |
| } |
| |
| @Override |
| public void addReferencedColumns(Set<DBColumn> list) |
| { |
| // forward |
| this.left.addReferencedColumns(list); |
| this.right.addReferencedColumns(list); |
| } |
| |
| @Override |
| public void addSQL(DBSQLBuilder sql, long context) |
| { |
| this.left.addSQL(sql, context); |
| sql.append(" @@ "); |
| this.right.addSQL(sql, context); |
| } |
| } |