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PayPal SDK for integrating with the REST APIs
There is a newer version: 1.14.0
package com.paypal.base;

import com.paypal.base.rest.PayPalRESTException;

import java.util.*;
import java.util.Map.Entry;

/**
 * SDKUtil class holds utility methods for processing data transformation
 * 
 */
public final class SDKUtil {

	private SDKUtil() {
	}

	/**
	 * Constructs a Map from a {@link Properties} object by
	 * combining the default values. See {@link ConfigManager} for default
	 * values
	 * 
	 * @param properties
	 *            Input {@link Properties}
	 * @return Map
	 */
	public static Map constructMap(Properties properties) {
		Properties combinedProperties = ConfigManager.combineDefaultProperties(properties);
		Map propsMap = new HashMap();

		// Since the default properties are only searchable
		Enumeration keys = combinedProperties.propertyNames();
		while (keys.hasMoreElements()) {
			String key = keys.nextElement().toString().trim();
			String value = combinedProperties.getProperty(key).trim();
			propsMap.put(key, value);
		}
		return propsMap;
	}

	/**
	 * Combines some {@link Map} with default values. See {@link ConfigManager}
	 * for default values.
	 * 
	 * @param receivedMap
	 *            {@link Map} used to combine with Default {@link Map}
	 * @return Combined {@link Map}
	 */
	public static Map combineDefaultMap(Map receivedMap) {
		return combineMap(receivedMap, ConfigManager.getDefaultSDKMap());
	}

	public static Map combineMap(Map highMap, Map lowMap) {
		lowMap = lowMap != null ? lowMap : new HashMap();
		highMap = highMap != null ? highMap : new HashMap();
		lowMap.putAll(highMap);
		return lowMap;
	}

	/**
	 * Utility method to validate if the key exists in the provided map, and
	 * returns string value of the object
	 * 
	 * @param map
	 *            Map of String based key and values
	 * @param key
	 *            object to be found in the key
	 * @return String value of the key
	 * @throws PayPalRESTException
	 */
	public static String validateAndGet(Map map, String key) throws PayPalRESTException {
		if (map == null || key == null) {
			throw new PayPalRESTException("Map or Key cannot be null");
		}
		String value = map.get(key);
		if (value == null || value.equals("")) {
			for (Iterator> itemIter = map.entrySet().iterator(); itemIter.hasNext();) {
				Entry entry = itemIter.next();
				if (entry.getKey().equalsIgnoreCase(key)) {
					value = entry.getValue();
					break;
				}
			}

			if (value == null || value.equals("")) {
				throw new PayPalRESTException(key + " cannot be null");
			}
		}
		return value;
	}

}