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Hibernate Search backend which has indexing operations forwarded to Elasticsearch
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/*
 * Hibernate Search, full-text search for your domain model
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.search.elasticsearch.impl;

import java.util.Calendar;
import java.util.Date;

import org.hibernate.search.elasticsearch.client.impl.URLEncodedString;
import org.hibernate.search.elasticsearch.util.impl.ElasticsearchDateHelper;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;

/**
 * Builder used to make the Gson API chainable.
 *
 * @author Guillaume Smet
 */
public class JsonBuilder {

	private JsonBuilder() {
	}

	public static JsonBuilder.Array array() {
		return new JsonBuilder.Array();
	}

	public static JsonBuilder.Array array(JsonArray jsonArray) {
		return new JsonBuilder.Array( jsonArray );
	}

	public static JsonBuilder.Object object() {
		return new JsonBuilder.Object();
	}

	public static JsonBuilder.Object object(JsonObject jsonObject) {
		return new JsonBuilder.Object( jsonObject );
	}

	/**
	 * An interface for reusable objects that append data to a JSON object.
	 * Eases the use of conditional statements within this chainable API.
	 * @author Yoann Rodiere
	 */
	public interface JsonAppender {
		void append(T appendable);
	}

	public static class Array {
		private JsonArray jsonArray = new JsonArray();

		private Array() {
		}

		private Array(JsonArray jsonArray) {
			this.jsonArray = jsonArray;
		}

		public Array add(JsonElement element) {
			jsonArray.add( element );
			return this;
		}

		public Array add(JsonBuilder.Array element) {
			jsonArray.add( element.build() );
			return this;
		}

		public Array add(JsonBuilder.Object element) {
			jsonArray.add( element.build() );
			return this;
		}

		public Array append(JsonAppender appender) {
			appender.append( this );
			return this;
		}

		public JsonArray build() {
			return jsonArray;
		}

		@Override
		public String toString() {
			return jsonArray.toString();
		}

		public int size() {
			return jsonArray.size();
		}
	}

	public static class Object {
		private JsonObject jsonObject = new JsonObject();

		private Object() {
		}

		private Object(JsonObject jsonObject) {
			this.jsonObject = jsonObject;
		}

		public JsonBuilder.Object add( String property, JsonElement element) {
			jsonObject.add( property, element );
			return this;
		}

		public JsonBuilder.Object add( String property, JsonBuilder.Array element) {
			jsonObject.add( property, element.build() );
			return this;
		}

		public JsonBuilder.Object add( String property, JsonBuilder.Object element) {
			jsonObject.add( property, element.build() );
			return this;
		}

		public JsonBuilder.Object addProperty(String property, java.lang.Object value) {
			if ( value instanceof String || value == null ) {
				jsonObject.addProperty( property, (String) value );
			}
			if ( value instanceof URLEncodedString ) {
				addProperty( property, (URLEncodedString) value );
			}
			else if ( value instanceof Number ) {
				jsonObject.addProperty( property, (Number) value );
			}
			else if ( value instanceof Boolean ) {
				jsonObject.addProperty( property, (Boolean) value );
			}
			else if ( value instanceof Character ) {
				jsonObject.addProperty( property, (Character) value );
			}
			else if ( value instanceof Date ) {
				jsonObject.addProperty( property, ElasticsearchDateHelper.dateToString( (Date) value ) );
			}
			else if ( value instanceof Calendar ) {
				jsonObject.addProperty( property, ElasticsearchDateHelper.calendarToString( (Calendar) value ) );
			}
			return this;
		}

		public JsonBuilder.Object addProperty(String property, Boolean value) {
			jsonObject.addProperty( property, value );
			return this;
		}

		public JsonBuilder.Object addProperty(String property, Number value) {
			jsonObject.addProperty( property, value );
			return this;
		}

		public JsonBuilder.Object addProperty(String property, Character value) {
			jsonObject.addProperty( property, value );
			return this;
		}

		public JsonBuilder.Object addProperty(String property, String value) {
			jsonObject.addProperty( property, value );
			return this;
		}

		public JsonBuilder.Object addProperty(String property, URLEncodedString value) {
			jsonObject.addProperty( property, value.original );
			return this;
		}

		public Object append(JsonAppender appender) {
			appender.append( this );
			return this;
		}

		public JsonObject build() {
			return jsonObject;
		}

		@Override
		public String toString() {
			return jsonObject.toString();
		}

	}

}