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Port of jsonata.js to Java to enable rules for JSON content

There is a newer version: 2.5.1

/**
 * (c) Copyright 2018, 2019 IBM Corporation
 * 1 New Orchard Road, 
 * Armonk, New York, 10504-1722
 * United States
 * +1 914 499 1900
 * support: Nathaniel Mills [email protected]
 *
 * 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.api.jsonata4java;

import java.util.List;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.JsonNodeFactory;
import com.fasterxml.jackson.databind.node.ObjectNode;

public class Sequence {
	ArrayNode _array = JsonNodeFactory.instance.arrayNode();
	boolean _sequence = true;
	boolean _keepSingleton = false;
	int _length = 0;

	public Sequence() {
	}

	protected Sequence(List arg) {
		this();
		if (arg != null && arg.size() == 1) {
			push(arg.get(0));
		}
	}

	public int push(JsonNode obj) {
		_array.add(obj);
		_length = _array.size();
		return _length;
	}

	public void keepSingleton(boolean keepSingleton) {
		_keepSingleton = keepSingleton;
	}

	public void sequence(boolean sequence) {
		_sequence = sequence;
	}

	public void setSize(int size) {
		_array = JsonNodeFactory.instance.arrayNode(size);
		_length = 0;
	}

	public void put(int index, JsonNode obj) {
		_array.set(index, obj);
	}

	public static void main(String[] args) {
	}

	public String toString() {
		ObjectNode obj = JsonNodeFactory.instance.objectNode();
		ArrayNode array = JsonNodeFactory.instance.arrayNode();
		array.addAll(_array);
		obj.set("array", array);
		obj.put("sequence", _sequence);
		obj.put("length", _length);
		obj.put("keepSingleton", _keepSingleton);
		return obj.toString();
	}
}