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core module for querydsl

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/*
 * 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.group;

import com.querydsl.core.types.Expression;
import com.querydsl.core.types.ExpressionUtils;
import com.querydsl.core.types.Ops;
import com.querydsl.core.types.Path;
import com.querydsl.core.types.Visitor;
import com.querydsl.core.types.dsl.DslExpression;
import com.querydsl.core.types.dsl.Expressions;

/**
 * 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 alias expression
   */
  public DslExpression as(Path alias) {
    return Expressions.dslOperation(getType(), Ops.ALIAS, this, alias);
  }

  /**
   * Create an alias for the expression
   *
   * @return alias expression
   */
  public DslExpression as(String alias) {
    return as(ExpressionUtils.path(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();
  }
}