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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.mysema.commons.lang.Pair;
import com.querydsl.core.types.ConstructorExpression;
import com.querydsl.core.types.Expression;

/**
 * A pair of (Map) key and value
 *
 * @author sasa
 * @param  Map key type
 * @param  Map value type
 */
public final class QPair extends ConstructorExpression> {

  private static final long serialVersionUID = -1943990903548916056L;

  public static  QPair create(Expression key, Expression value) {
    return new QPair<>(key, value);
  }

  @SuppressWarnings({"unchecked"})
  public QPair(Expression key, Expression value) {
    super((Class) Pair.class, new Class[] {Object.class, Object.class}, key, value);
  }

  public boolean equals(Expression keyExpr, Expression valueExpr) {
    return getArgs().get(0).equals(keyExpr) && getArgs().get(1).equals(valueExpr);
  }

  public boolean equals(Expression keyExpr, Class valueType) {
    return getArgs().get(0).equals(keyExpr)
        && valueType.isAssignableFrom(getArgs().get(1).getType());
  }
}