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Jinja templating engine implemented in Java

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/**********************************************************************
 * Copyright (c) 2014 HubSpot Inc.
 *
 * 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.hubspot.jinjava.util;

import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.Map;

import com.google.common.collect.Iterators;

public final class ObjectIterator {

  private ObjectIterator() {}

  @SuppressWarnings("unchecked")
  public static ForLoop getLoop(Object obj) {
    if (obj == null) {
      return new ForLoop(Collections.emptyIterator(), 0);
    }
    // collection
    if (obj instanceof Collection) {
      Collection