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Calcite APIs for LINQ (Language-Integrated Query) in Java
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you 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 org.apache.calcite.linq4j.tree;

import java.lang.reflect.Type;
import java.util.List;
import java.util.Objects;

/**
 * Represents a constructor call.
 *
 * If {@link #memberDeclarations} is not null (even if empty) represents
 * an anonymous class.
 */
public class NewExpression extends Expression {
  public final Type type;
  public final List arguments;
  public final List memberDeclarations;
  /**
   * Cache the hash code for the expression
   */
  private int hash;

  public NewExpression(Type type, List arguments,
      List memberDeclarations) {
    super(ExpressionType.New, type);
    this.type = type;
    this.arguments = arguments;
    this.memberDeclarations = memberDeclarations;
  }

  @Override public Expression accept(Shuttle shuttle) {
    shuttle = shuttle.preVisit(this);
    final List arguments = Expressions.acceptExpressions(
        this.arguments, shuttle);
    final List memberDeclarations =
        Expressions.acceptMemberDeclarations(this.memberDeclarations, shuttle);
    return shuttle.visit(this, arguments, memberDeclarations);
  }

  public  R accept(Visitor visitor) {
    return visitor.visit(this);
  }

  @Override void accept(ExpressionWriter writer, int lprec, int rprec) {
    writer.append("new ").append(type).list("(\n", ",\n", ")", arguments);
    if (memberDeclarations != null) {
      writer.list("{\n", "", "}", memberDeclarations);
    }
  }

  @Override public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    if (!super.equals(o)) {
      return false;
    }

    NewExpression that = (NewExpression) o;

    if (arguments != null ? !arguments.equals(that.arguments)
        : that.arguments != null) {
      return false;
    }
    if (memberDeclarations
        != null ? !memberDeclarations.equals(that.memberDeclarations)
        : that.memberDeclarations != null) {
      return false;
    }
    if (!type.equals(that.type)) {
      return false;
    }

    return true;
  }

  @Override public int hashCode() {
    int result = hash;
    if (result == 0) {
      result = Objects.hash(nodeType, super.type, type, arguments,
          memberDeclarations);
      if (result == 0) {
        result = 1;
      }
      hash = result;
    }
    return result;
  }
}

// End NewExpression.java