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A thundr module enabling thundr for use on GAE (Google App Engine)

There is a newer version: 3.0.0

/*
 * This file is a component of thundr, a software library from 3wks.
 * Read more: http://3wks.github.io/thundr/
 * Copyright (C) 2015 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.search.gae.mediator;

import java.math.BigDecimal;
import java.math.RoundingMode;

import com.google.appengine.api.search.Field.Builder;
import com.google.appengine.api.search.checkers.SearchApiLimits;
import com.threewks.thundr.transformer.TransformerManager;

public class BigDecimalFieldMediator implements FieldMediator {
	private static final BigDecimal Min = new BigDecimal(SearchApiLimits.MINIMUM_NUMBER_VALUE);
	private static final BigDecimal Max = new BigDecimal(SearchApiLimits.MAXIMUM_NUMBER_VALUE);

	private int shift;
	private int scale;

	public BigDecimalFieldMediator() {
		this(3, 3);
	}

	public BigDecimalFieldMediator(int shift, int scale) {
		this.shift = shift;
		this.scale = scale;
	}

	@SuppressWarnings("unchecked")
	@Override
	public  BigDecimal normalise(TransformerManager transformerManager, In value) {
		Class valueClass = (Class) value.getClass();
		BigDecimal bigDecimalValue = transformerManager.transform(valueClass, BigDecimal.class, value);
		bigDecimalValue = bigDecimalValue.movePointLeft(shift).setScale(shift + scale, RoundingMode.DOWN);
		bigDecimalValue = bigDecimalValue.min(Max).max(Min);
		return bigDecimalValue;
	}

	@Override
	public void setValue(Builder builder, BigDecimal value) {
		builder.setNumber(value.doubleValue());
	}

	@Override
	public String stringify(BigDecimal value) {
		return Double.valueOf(value.doubleValue()).toString();
	}

	@Override
	public Class getTargetType() {
		return BigDecimal.class;
	}

}