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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 creating a new array and possibly initializing the elements of the
 * new array.
 */
public class NewArrayExpression extends Expression {
  public final int dimension;
  public final Expression bound;
  public final List expressions;
  /**
   * Cache the hash code for the expression
   */
  private int hash;

  public NewArrayExpression(Type type, int dimension, Expression bound,
      List expressions) {
    super(ExpressionType.NewArrayInit, Types.arrayType(type, dimension));
    this.dimension = dimension;
    this.bound = bound;
    this.expressions = expressions;
  }

  @Override public Expression accept(Shuttle shuttle) {
    shuttle = shuttle.preVisit(this);
    List expressions =
        this.expressions == null
            ? null
            : Expressions.acceptExpressions(this.expressions, shuttle);
    Expression bound = Expressions.accept(this.bound, shuttle);
    return shuttle.visit(this, dimension, bound, expressions);
  }

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

  @Override void accept(ExpressionWriter writer, int lprec, int rprec) {
    writer.append("new ").append(Types.getComponentTypeN(type));
    for (int i = 0; i < dimension; i++) {
      if (i == 0 && bound != null) {
        writer.append('[').append(bound).append(']');
      } else {
        writer.append("[]");
      }
    }
    if (expressions != null) {
      writer.list(" {\n", ",\n", "}", expressions);
    }
  }

  @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;
    }

    NewArrayExpression that = (NewArrayExpression) o;

    if (dimension != that.dimension) {
      return false;
    }
    if (bound != null ? !bound.equals(that.bound) : that.bound != null) {
      return false;
    }
    if (expressions != null ? !expressions.equals(that.expressions) : that
        .expressions != null) {
      return false;
    }

    return true;
  }

  @Override public int hashCode() {
    int result = hash;
    if (result == 0) {
      result = Objects.hash(nodeType, type, dimension, bound, expressions);
      if (result == 0) {
        result = 1;
      }
      hash = result;
    }
    return result;
  }
}

// End NewArrayExpression.java