com.googlecode.objectify.impl.conv.ArrayConverter Maven / Gradle / Ivy

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*** THIS VERSION UPLOADED FOR USE WITH CEDAR-COMMON, TO AVOID DEPENDENCIES ON GOOGLE CODE-BASED MAVEN REPOSITORIES. *** The simplest convenient interface to the Google App Engine datastore

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package com.googlecode.objectify.impl.conv;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Collection;

import com.google.appengine.api.datastore.Blob;


/**
 * Knows how to convert java arrays.  Note that each individual element must be
 * converted as well. 
 */
public class ArrayConverter implements Converter
{
	/** Need this to convert members */
	Conversions conversions;
	
	/** */
	public ArrayConverter(Conversions conv)
	{
		this.conversions = conv;
	}
	
	@Override
	public Object forDatastore(Object value, ConverterSaveContext ctx)
	{
		if (!value.getClass().isArray())
			return null;

		if (ctx.inEmbeddedCollection())
			throw new IllegalStateException("You cannot have arrays within @Embedded arrays or collections");
		
		if (value.getClass().getComponentType() == Byte.TYPE)
		{
			// Special case!  byte[] gets turned into Blob.
			return new Blob((byte[])value);
		}
		else
		{
			// The datastore cannot persist arrays, but it can persist ArrayList
			int length = Array.getLength(value);
			ArrayList