com.mysema.query.JoinFlag Maven / Gradle / Ivy
/*
* Copyright 2011, Mysema Ltd
*
* 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 com.mysema.query;
import java.io.Serializable;
import javax.annotation.concurrent.Immutable;
import com.mysema.query.types.Expression;
import com.mysema.query.types.TemplateExpressionImpl;
/**
* JoinFlag defines a join related flag using an Expression instance
*
* @author tiwe
*
*/
@Immutable
public class JoinFlag implements Serializable{
public enum Position {
/**
* before the join
*/
START,
/**
* as a replacement for the join symbol
*/
OVERRIDE,
/**
* before the join target
*/
BEFORE_TARGET,
/**
* before the join condition
*/
BEFORE_CONDITION,
/**
* after the join
*/
END
}
private static final long serialVersionUID = -688265393547206465L;
private final Expression flag;
private final Position position;
public JoinFlag(String flag) {
this(TemplateExpressionImpl.create(Object.class, flag), Position.BEFORE_TARGET);
}
public JoinFlag(String flag, Position position) {
this(TemplateExpressionImpl.create(Object.class, flag), position);
}
public JoinFlag(Expression flag) {
this(flag, Position.BEFORE_TARGET);
}
public JoinFlag(Expression flag, Position position) {
this.flag = flag;
this.position = position;
}
@Override
public int hashCode() {
return flag.hashCode();
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
} else if (obj instanceof JoinFlag) {
return ((JoinFlag)obj).flag.equals(flag);
} else {
return false;
}
}
@Override
public String toString() {
return flag.toString();
}
public Expression getFlag() {
return flag;
}
public Position getPosition() {
return position;
}
}