com.querydsl.core.JoinFlag Maven / Gradle / Ivy
/*
* Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
*
* 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.querydsl.core;
import com.querydsl.core.annotations.Immutable;
import com.querydsl.core.types.Expression;
import com.querydsl.core.types.ExpressionUtils;
import java.io.Serializable;
/**
* {@code JoinFlag} defines a join related flag using an Expression instance
*
* {@code JoinFlag} instances can be used in Querydsl modules which serialize queries to String
* form.
*
* @author tiwe
*/
@Immutable
public class JoinFlag implements Serializable {
/** The different {@code JoinFlag} positions */
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;
/**
* Create a new instance using the given flag
*
*
The used position is before the target.
*
* @param flag flag in String form
*/
public JoinFlag(String flag) {
this(ExpressionUtils.template(Object.class, flag), Position.BEFORE_TARGET);
}
/**
* Create a new instance using the given flag and position.
*
* @param flag flag in String form
* @param position position of the flag in the join
*/
public JoinFlag(String flag, Position position) {
this(ExpressionUtils.template(Object.class, flag), position);
}
/**
* Create a new instance using the given flag
*
*
The used position is before the target.
*
* @param flag flag in Expression form
*/
public JoinFlag(Expression flag) {
this(flag, Position.BEFORE_TARGET);
}
/**
* Create a new instance using the given flag and position
*
* @param flag flag in Expression form
* @param position position of the flag in the join
*/
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;
}
}