/*
* Copyright 2009 Ralf Joachim, Ahmad Hassan
*
* Licensed 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.castor.cpa.persistence.sql.query.condition;
import java.util.Iterator;
import org.castor.cpa.persistence.sql.query.QueryConstants;
import org.castor.cpa.persistence.sql.query.Visitor;
/**
* Represents a list of conditions that are concatenated by an AND operator.
*
* @author <a href="mailto:ahmad DOT hassan AT gmail DOT com">Ahmad Hassan</a>
* @author <a href="mailto:ralf DOT joachim AT syscon DOT eu">Ralf Joachim</a>
* @version $Revision$ $Date: 2006-04-25 15:08:23 -0600 (Tue, 25 Apr 2006) $
*/
public final class AndCondition extends CompoundCondition {
//-----------------------------------------------------------------------------------
/**
* Default constructor for an empty AND condition.
*/
public AndCondition () {
super();
}
/**
* Constructor for a compound condition that concatenates the 2 given conditions with
* an AND operator.
*
* @param condition1 First condition.
* @param condition2 Second condition.
*/
public AndCondition(final Condition condition1, final Condition condition2) {
this();
append(condition1);
append(condition2);
}
/**
* Copy constructor to create a copy of given AND condition.
*
* @param condition AND condition to create a copy of.
*/
public AndCondition(final AndCondition condition) {
super(condition);
}
//-----------------------------------------------------------------------------------
@Override
protected void append(final Condition condition) {
if (condition instanceof AndCondition) {
AndCondition and = (AndCondition) condition;
for (Iterator<Condition> iter = and.iterator(); iter.hasNext(); ) {
super.append(iter.next());
}
} else {
super.append(condition);
}
}
//-----------------------------------------------------------------------------------
@Override
public Condition and(final Condition condition) {
append(condition);
return this;
}
@Override
public Condition not() {
Condition condition = new OrCondition();
for (Iterator<Condition> iter = iterator(); iter.hasNext(); ) {
condition.or(iter.next().not());
}
return condition;
}
//-----------------------------------------------------------------------------------
/**
* {@inheritDoc}
*/
public void accept (final Visitor visitor) { visitor.visit(this); }
//-----------------------------------------------------------------------------------
/**
* Method constructing query string.
*
* @return Constructed query string.
*/
public String toString() {
StringBuffer sb = new StringBuffer();
for (Iterator<Condition> iter = iterator(); iter.hasNext(); ) {
Condition condition = iter.next();
if (condition instanceof CompoundCondition) {
sb.append(QueryConstants.LPAREN);
sb.append(condition.toString());
sb.append(QueryConstants.RPAREN);
} else {
sb.append(condition.toString());
}
if (iter.hasNext()) {
sb.append(QueryConstants.SPACE);
sb.append(QueryConstants.AND);
sb.append(QueryConstants.SPACE);
}
}
return sb.toString();
}
//-----------------------------------------------------------------------------------
}