geode-core/src/main/java/org/apache/geode/cache/query/internal/parse/ASTIteratorDef.java

/*
 * 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.geode.cache.query.internal.parse;

import antlr.Token;

import org.apache.geode.cache.query.internal.QCompiler;
import org.apache.geode.internal.Assert;

public class ASTIteratorDef extends GemFireAST {
  private static final long serialVersionUID = -736956634497535951L;

  public ASTIteratorDef() {}


  public ASTIteratorDef(Token t) {
    super(t);
  }

  @Override
  public void compile(QCompiler compiler) {
    // children are colln expr, id, and type.
    // the id and/or type may be missing.

    GemFireAST child = (GemFireAST) getFirstChild();
    child.compile(compiler); // the colln expr

    GemFireAST nextChild = (GemFireAST) child.getNextSibling();
    if (nextChild == null) {
      // push two nulls for id and type
      compiler.pushNull();
      compiler.pushNull();
    } else {
      if (nextChild instanceof ASTType) {
        // push a null for the id
        compiler.pushNull(); // id
        nextChild.compile(compiler); // the type
        nextChild = (GemFireAST) nextChild.getNextSibling();
        Assert.assertTrue(nextChild == null);
      } else {
        nextChild.compile(compiler); // the id
        nextChild = (GemFireAST) nextChild.getNextSibling();
        if (nextChild == null) { // no type
          compiler.pushNull(); // type
        } else {
          Assert.assertTrue(nextChild instanceof ASTType);
          nextChild.compile(compiler); // must be the type
          Assert.assertTrue(nextChild.getNextSibling() == null);
        }
      }
    }

    compiler.iteratorDef();
  }


}