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Nyla Solutions Global Java API provides support for basic application utilities (application configuration, data encryption, debugger and text processing).
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package nyla.solutions.global.patterns.reflection;

import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import nyla.solutions.global.operations.ClassPath;
import nyla.solutions.global.patterns.search.ReLookup;
import nyla.solutions.global.util.Config;

/**
 * 
 * @author Gregory Green
 *
 */
public class ObjectClassSizer
{
	/**
	 * Construct object with a default object 
	 * class size map.
	 * 
	 * 		this.defaultTypeSizes = new HashMap, Long>();
		this.defaultTypeSizes.put(String.class, Long.valueOf(defaultStringSizeBytes));  //100 KB
		this.defaultTypeSizes.put(boolean.class,Long.valueOf(1));
		this.defaultTypeSizes.put(Boolean.class,Long.valueOf(2));
		this.defaultTypeSizes.put(byte.class,Long.valueOf(1));
		this.defaultTypeSizes.put(Byte.class,Long.valueOf(2));
		this.defaultTypeSizes.put(char.class, Long.valueOf(2));
		this.defaultTypeSizes.put(Character.class, Long.valueOf(4));
		this.defaultTypeSizes.put( short.class,Long.valueOf(2));
		this.defaultTypeSizes.put( Short.class,Long.valueOf(4));
		this.defaultTypeSizes.put( int.class,Long.valueOf(4));
		this.defaultTypeSizes.put( Integer.class,Long.valueOf(8));
		this.defaultTypeSizes.put(long.class, Long.valueOf(8));
		this.defaultTypeSizes.put(Long.class, Long.valueOf(18));
		this.defaultTypeSizes.put(float.class, Long.valueOf(4));
		this.defaultTypeSizes.put(Float.class, Long.valueOf(8));
		this.defaultTypeSizes.put(double.class, Long.valueOf(8));
		this.defaultTypeSizes.put(Double.class, Long.valueOf(16));
        this.defaultTypeSizes.put(Void.class, Long.valueOf(0));
        this.defaultTypeSizes.put(BigDecimal.class, Long.valueOf(32));
        this.defaultTypeSizes.put(BigInteger.class, Long.valueOf(56));
	 */
	public ObjectClassSizer()
	{
		this.defaultTypeSizes = new HashMap, Long>();
		//this.defaultTypeSizes.put(String.class, Long.valueOf(defaultStringSizeBytes));  //100 KB
		this.defaultTypeSizes.put(boolean.class,Long.valueOf(1));
		this.defaultTypeSizes.put(Boolean.class,Long.valueOf(2));
		this.defaultTypeSizes.put(byte.class,Long.valueOf(1));
		this.defaultTypeSizes.put(Byte.class,Long.valueOf(2));
		this.defaultTypeSizes.put(char.class, Long.valueOf(2));
		this.defaultTypeSizes.put(Character.class, Long.valueOf(4));
		this.defaultTypeSizes.put( short.class,Long.valueOf(2));
		this.defaultTypeSizes.put( Short.class,Long.valueOf(4));
		this.defaultTypeSizes.put( int.class,Long.valueOf(4));
		this.defaultTypeSizes.put( Integer.class,Long.valueOf(8));
		this.defaultTypeSizes.put(long.class, Long.valueOf(8));
		this.defaultTypeSizes.put(Long.class, Long.valueOf(18));
		this.defaultTypeSizes.put(float.class, Long.valueOf(4));
		this.defaultTypeSizes.put(Float.class, Long.valueOf(8));
		this.defaultTypeSizes.put(double.class, Long.valueOf(8));
		this.defaultTypeSizes.put(Double.class, Long.valueOf(16));
		this.defaultTypeSizes.put(Date.class, Long.valueOf(32));
        this.defaultTypeSizes.put(Void.class, Long.valueOf(0));
        this.defaultTypeSizes.put(BigDecimal.class, Long.valueOf(32));
        this.defaultTypeSizes.put(BigInteger.class, Long.valueOf(56));

	}// --------------------------------------------------------
	/**
	 * 
	 * @param aClass the class to estimate
	 * @return
	 */
    public long sizeInBytes(Class aClass)
    { 	    	
    	 if(!String.class.equals(aClass) && ClassPath.isPrimitive(aClass) )
         {
              
         	Long sizeLong = this.defaultTypeSizes.get(aClass);
         	return sizeLong.longValue();
         }
    	 
    	 
    	 //test if is enum
    	 if(aClass.isEnum())
    	 {
    		Object[] enumConstants =  aClass.getEnumConstants();
    		long enumEntyrSize = defaultTypeSizes.get(int.class).longValue();
    		
    		if(enumConstants == null || enumConstants.length == 0)
    			return enumEntyrSize;
    		else
    			return enumEntyrSize * enumConstants.length + 1;
    		
    	 }
    	 
    	 //check if in default type size
    	 Long defaultTypeSize = defaultTypeSizes.get(aClass);
    	 
    	 if(defaultTypeSize != null)
    		 return defaultTypeSize.longValue();

        Field fields[] = aClass.getDeclaredFields();
        Field arr[] = fields;
        int len = arr.length;
        long totalSize = 0;
        
        for(int i = 0; i < len; i++)
        {
            Field field = arr[i];
            
            //check if field name has a default size
            String fieldName = field.getName();
           //check if field name has a size
            
            Long fieldNameLengthBytes = fieldDefaultSizes.get(fieldName);
            
            Class fieldClass  = field.getType();
            
            if(fieldNameLengthBytes != null)
            {
            	//Total by field name
            	totalSize += fieldNameLengthBytes.longValue();
            }
            else if(String.class.equals(fieldClass) || char[].class.equals(fieldClass))
            {
            	totalSize += defaultStringSizeBytes;
            	
            }
            else if(ClassPath.isPrimitive(fieldClass) )
            {
                 
            	Long sizeLong = this.defaultTypeSizes.get(fieldClass);
            	totalSize +=  sizeLong.longValue();
            }
            else
            {
            	//nested call
            	totalSize += sizeInBytes(field.getType());   	
            } 
            
        }

        return totalSize;
    }// --------------------------------------------------------
    
    
    /**
	 * @return the defaultStringSizeBytes
	 */
	public int getDefaultStringSizeBytes() {
		return defaultStringSizeBytes;
	}
	/**
	 * @param defaultStringSizeBytes the defaultStringSizeBytes to set
	 */
	public void setDefaultStringSizeBytes(int defaultStringSizeBytes) {
		this.defaultStringSizeBytes = defaultStringSizeBytes;
	}
	/**
	 * @return the fieldDefaultSizes
	 */
	public ReLookup getFieldDefaultSizes() {
		return fieldDefaultSizes;
	}
	/**
	 * @param fieldDefaultSizes the fieldDefaultSizes to set
	 */
	public void setFieldDefaultSizes(ReLookup fieldDefaultSizes) {
		this.fieldDefaultSizes = fieldDefaultSizes;
	}
	/**
	 * @return the defaultTypeSizes
	 */
	public Map, Long> getDefaultTypeSizes() {
		return defaultTypeSizes;
	}
	/**
	 * @param defaultTypeSizes the defaultTypeSizes to set
	 */
	public void setDefaultTypeSizes(Map, Long> defaultTypeSizes) {
		this.defaultTypeSizes = defaultTypeSizes;
	}


	private int defaultStringSizeBytes = Config.getPropertyInteger(ObjectClassSizer.class,"defaultStringSizeBytes", 1000).intValue();
    
    private ReLookup fieldDefaultSizes = new ReLookup();
    private Map,Long> defaultTypeSizes;
}