org.apache.empire.db.expr.compare.DBCompareExpr Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
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* 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.empire.db.expr.compare;
import org.apache.empire.db.DBColumnExpr;
import org.apache.empire.db.DBCommand;
import org.apache.empire.db.DBExpr;
import org.apache.empire.db.DBRowSet;
/**
* This class is a common base class for all SQL filter constraints classes
*
*
*/
public abstract class DBCompareExpr extends DBExpr
{
// *Deprecated* private static final long serialVersionUID = 1L;
public abstract boolean isMutuallyExclusive(DBCompareExpr other);
public abstract boolean isConstraintOn(DBColumnExpr colExpr);
/**
* Creates a new DBCompareAndOrExpr object.
*
* @param expr the right part of the AND expression
* @return the and compare expression
*/
public DBCompareAndOrExpr and(DBCompareExpr expr)
{
// " AND "
return new DBCompareAndOrExpr(this, expr, false);
}
/**
* Create a new DBCompareAndOrExpr object.
* @param expr the right part of the OR expression
* @return the or compare expression
*/
public DBCompareAndOrExpr or(DBCompareExpr expr)
{
// " OR "
return new DBCompareAndOrExpr(this, expr, true);
}
/**
* Creates a sql-expression for the not() function.
*
* @return the new DBCompareColExpr object
*/
public DBCompareExpr not()
{
return new DBCompareNotExpr(this);
}
/**
* Returns the underlying rowset containing this column
* For functions involving none or more than one physical column this function return the first one
* @return a column used for this expression
*/
public abstract DBRowSet getRowSet();
/**
* internally used for preapred statement generation
* @param cmd
*/
public abstract void prepareCommand(DBCommand cmd);
/**
* internally used for command cloning
* @param newCmd the new command object
*/
public abstract DBCompareExpr copy(DBCommand newCmd);
}