com.mysema.query.group.AbstractGroupExpression 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.group;
import com.mysema.query.types.Expression;
import com.mysema.query.types.Ops;
import com.mysema.query.types.Path;
import com.mysema.query.types.PathImpl;
import com.mysema.query.types.Visitor;
import com.mysema.query.types.expr.DslExpression;
import com.mysema.query.types.expr.DslOperation;
/**
* A base class for GroupExpressions
* @author sasa
*
* @param
* @param
*/
public abstract class AbstractGroupExpression implements GroupExpression {
private static final long serialVersionUID = 1509709546966783160L;
private final Class type;
private final Expression expr;
@SuppressWarnings("unchecked")
public AbstractGroupExpression(Class type, Expression expr) {
this.type = (Class)type;
this.expr = expr;
}
/**
* Create an alias for the expression
*
* @return
*/
@SuppressWarnings("unchecked")
public DslExpression as(Path alias) {
return DslOperation.create((Class)getType(), Ops.ALIAS, this, alias);
}
/**
* Create an alias for the expression
*
* @return
*/
public DslExpression as(String alias) {
return as(new PathImpl(getType(), alias));
}
@Override
public Expression getExpression() {
return expr;
}
@Override
public R accept(Visitor v, C context) {
return expr.accept(v, context);
}
@Override
public boolean equals(Object o) {
if (o != null && getClass().equals(o.getClass())) {
return ((GroupExpression)o).getExpression().equals(expr);
} else {
return false;
}
}
@Override
public Class getType() {
return type;
}
@Override
public int hashCode() {
return expr.hashCode();
}
@Override
public String toString() {
return expr.toString();
}
}