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A thundr module for supporting metrics in big query
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/*
 * This file is a component of thundr, a software library from 3wks.
 * Read more: http://www.3wks.com.au/thundr
 * Copyright (C) 2014 3wks, 
 *
 * 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.threewks.thundr.bigmetrics.field;

import java.util.LinkedHashMap;
import java.util.Map;

import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

import com.atomicleopard.expressive.Expressive;
import com.threewks.thundr.bigmetrics.bigquery.BigQueryType;

/**
 * This {@link FieldProcessor} denormalises the date so that as well as being stored as a timestamp,
 * individual components of the date are also stored.
 */
public class DateTimeFieldProcessor implements FieldProcessor {
	public static final DateTimeFormatter TimestampFormat = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss.SSS").withZoneUTC();
	private Map namedFormatters = new LinkedHashMap<>();

	public DateTimeFieldProcessor() {
		namedFormatters.put("year", DateTimeFormat.forPattern("yyyy").withZoneUTC());
		namedFormatters.put("month", DateTimeFormat.forPattern("MM").withZoneUTC());
		namedFormatters.put("day", DateTimeFormat.forPattern("dd").withZoneUTC());
		namedFormatters.put("weekday", DateTimeFormat.forPattern("e").withZoneUTC());
		namedFormatters.put("hour", DateTimeFormat.forPattern("HH").withZoneUTC());
		namedFormatters.put("minute", DateTimeFormat.forPattern("mm").withZoneUTC());
		namedFormatters.put("second", DateTimeFormat.forPattern("ss").withZoneUTC());
		namedFormatters.put("millis", DateTimeFormat.forPattern("SSS").withZoneUTC());
		namedFormatters.put("zone", DateTimeFormat.forPattern("ZZ").withZoneUTC());
	}

	@Override
	public Map process(String name, BigQueryType type, DateTime data) {
		Map denormalised = new LinkedHashMap<>();
		denormalised.put(name, data == null ? null : TimestampFormat.print(data));
		for (Map.Entry formatter : namedFormatters.entrySet()) {
			denormalised.put(name + "_" + formatter.getKey(), data == null ? null : formatter.getValue().print(data));
		}
		return denormalised;
	}

	@Override
	public Map fields(String name, BigQueryType type) {
		// @formatter:off
		return Expressive.map(
				name,			BigQueryType.Timestamp,
				name+ "_year",	BigQueryType.Integer,
				name+ "_month",	BigQueryType.Integer,
				name+ "_day", 	BigQueryType.Integer,
				name+ "_weekday",BigQueryType.Integer,
				name+ "_hour", 	BigQueryType.Integer,
				name+ "_minute",BigQueryType.Integer,
				name+ "_second",BigQueryType.Integer,
				name+ "_millis",BigQueryType.Integer,
				name+ "_zone", 	BigQueryType.String
		);
		// @formatter:on
	}

}