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package com.googlecode.objectify.impl.translate.opt;

import com.google.cloud.datastore.LongValue;
import com.google.cloud.datastore.Value;
import com.google.cloud.datastore.ValueType;
import com.googlecode.objectify.impl.translate.SimpleTranslatorFactory;

import java.math.BigDecimal;

/**
 * 

This a simple strategy for storing BigDecimal in the datastore. BigDecimalLongConverter multiplies * by a fixed factor and stores the result as a Long. This is appropriate for monetary and other (relatively) * small values with fixed decimal precision.

* *

This is one possible strategy and not appropriate for all uses of BigDecimal - especially very large * values which cannot fit in a Long. For this reason, the converter is not installed by default. You can * Install this converter at the same time you perform registration:

* *
ObjectifyService.factory().getTranslators().add(new BigDecimalLongTranslatorFactory());
* *

The default factor of 1,000 is good for currency, which usually has 0-3 digits of precision past * the decimal point. But you can pick any other factor appropriate to your application.

* *

All custom translators must be registered *before* entity classes are registered.

* * @author Jeff Schnitzer */ public class BigDecimalLongTranslatorFactory extends SimpleTranslatorFactory { /** Default factor is 1000, which gives you three digits of precision past the decimal point */ public static final long DEFAULT_FACTOR = 1000; /** */ private BigDecimal factor; /** * Construct this converter with the default factor (1000), which can store three points of * precision past the decimal point. */ public BigDecimalLongTranslatorFactory() { this(DEFAULT_FACTOR); } /** * Construct this with an arbitrary factor. Powers of ten are highly recommended if you want to * be able to interpret the numbers in the datastore viewer. * * @param factor number multiplied by before storage and divided by on retrieval. */ public BigDecimalLongTranslatorFactory(long factor) { super(BigDecimal.class, ValueType.LONG); this.factor = new BigDecimal(factor); } @Override protected BigDecimal toPojo(final Value value) { return new BigDecimal(value.get()).divide(factor); } @Override protected Value toDatastore(final BigDecimal value) { return LongValue.of(value.multiply(factor).longValueExact()); } }




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