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/**
 * DataHelper.java
 * Created on Aug 21, 2013
 *
 * Copyright (c) 2013, 2014 Wind River Systems, Inc.
 *
 * The right to copy, distribute, modify, or otherwise make use
 * of this software may be licensed only pursuant to the terms
 * of an applicable Wind River license agreement.
 */
package org.eclipse.tcf.te.runtime.persistence.utils;

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

import org.eclipse.tcf.te.runtime.interfaces.properties.IPropertiesContainer;
import org.eclipse.tcf.te.runtime.persistence.PersistenceManager;
import org.eclipse.tcf.te.runtime.persistence.interfaces.IPersistenceDelegate;
import org.eclipse.tcf.te.runtime.properties.PropertiesContainer;

/**
 * Data helper for de/encoding.
 */
public class DataHelper {

	/**
	 * Encode a properties container to a string.
	 * @param data The properties container.
	 * @return String representing the properties container.
	 */
	public static final String encodePropertiesContainer(IPropertiesContainer data) {
		try {
			if (data != null && !data.isEmpty()) {
				IPersistenceDelegate delegate = PersistenceManager.getInstance().getDelegate(Map.class, String.class);
				return (String)delegate.write(data, String.class);
			}
		}
		catch (Exception e) {
		}
		return null;
	}

	private static final Map<String, IPropertiesContainer> cache = new LinkedHashMap<String, IPropertiesContainer>();

	/**
	 * Decode a string encoded properties container.
	 * @param encoded The string encoded properties container.
	 * @return Properties container.
	 */
	public static final IPropertiesContainer decodePropertiesContainer(String encoded) {
		if (encoded != null && encoded.trim().length() > 0) {
			IPropertiesContainer result = cache.remove(encoded);
			if (result == null) {
				try {
					IPersistenceDelegate delegate = PersistenceManager.getInstance().getDelegate(Map.class, String.class);
					result = (IPropertiesContainer)delegate.read(IPropertiesContainer.class, encoded);
				}
				catch (Exception e) {
				}

				if (cache.size() == 10) cache.remove(cache.keySet().toArray()[0]);
			}

			cache.put(encoded, result);

			return result;
		}
		return new PropertiesContainer();
	}

	/**
	 * Convert all keys of the map to lower case.
	 * @param list The list of maps to convert.
	 * @return List with new maps with lowercase keys.
	 */
	public static List<Map<String,Object>> keysToLowerCase(List<Map<String,Object>> list) {
		List<Map<String, Object>> paramListLowerCase = new ArrayList<Map<String,Object>>();
		for (Map<String, Object> map : list) {
			paramListLowerCase.add(keysToLowerCase(map));
		}
		return paramListLowerCase;
	}

	/**
	 * Convert all keys of the map to lower case.
	 * @param map The map to convert.
	 * @return New map with lowercase keys.
	 */
	@SuppressWarnings("unchecked")
	public static Map<String,Object> keysToLowerCase(Map<String,Object> map) {
		Map<String, Object> mapLowerCase = new HashMap<String, Object>();
		for (String key : map.keySet()) {
			Object value = map.get(key);
			if (value instanceof Map) {
				value = keysToLowerCase((Map<String,Object>)value);
			}
			else if (value instanceof List) {
				value = keysToLowerCase((List<Map<String,Object>>)value);
			}
			mapLowerCase.put(key.toLowerCase(), value);
		}
		return mapLowerCase;
	}
}

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