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Provides a POJO centric model as per Spring Data interfaces to interact with Amazon SimpleDB, a non-relational datastore

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/*
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 * and open the template in the editor.
 */
package org.springframework.data.simpledb.attributeutil;

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

public final class AttributesKeySplitter {

	private AttributesKeySplitter() {
		/* utility class */
	}

	public static Map> splitNestedAttributeKeys(Map attributes) {
		final Map> nestedFieldAttributes = new HashMap>();

		for(final Map.Entry entry : attributes.entrySet()) {
			final String key = entry.getKey();

			if(key.contains(".")) {
				Map nestedFieldValues = new HashMap();
				int prefixIndex = key.indexOf('.');
				final String nestedFieldName = key.substring(0, prefixIndex);
				final String subField = key.substring(prefixIndex + 1);

				if(nestedFieldAttributes.containsKey(nestedFieldName)) {
					nestedFieldValues = nestedFieldAttributes.get(nestedFieldName);
				}

				nestedFieldValues.put(subField, entry.getValue());

				nestedFieldAttributes.put(nestedFieldName, nestedFieldValues);
			}
		}
		return nestedFieldAttributes;
	}

	public static Map splitSimpleAttributesKeys(Map attributes) {

		Map primitiveAttributes = new LinkedHashMap();

		for(final Map.Entry entry : attributes.entrySet()) {
			if(isSimpleKey(entry.getKey())) {
				primitiveAttributes.put(entry.getKey(), entry.getValue());
			}
		}

		return primitiveAttributes;

	}

	private static boolean isSimpleKey(final String key) {
		return !key.contains(".");
	}

}