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jpa4azure, implements a subset of the JPA specification using Azure Storage for pesisting beans. see http://jpa4azure.codeplex.com for more information.

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package com.windowsazure.samples;

import java.util.Date;
import java.util.Iterator;
import java.util.Vector;

import com.windowsazure.samples.Property;


public final class PropertyCollection implements Iterable> {

	public PropertyCollection() {
		properties = new Vector>();
	}
	
	public PropertyCollection(String partitionKey, String rowKey) {
		this(partitionKey, rowKey, new Date());
	}
	
	public PropertyCollection(String partitionKey, String rowKey, Date timestamp) {
		properties = new Vector>();
		setPartitionKey(partitionKey);
		setRowKey(rowKey);
		setTimestamp(timestamp);
	}
	
	public void add(Property newProperty) {
		Property property = getProperty(newProperty.getName());
		if (property != null)
			properties.remove(property);
		properties.add(newProperty);
	}
	
	public int getCount() {
		return properties.size();
	}
	
	public String getPartitionKey() {
		return this.getProperty(Property.PARTITION_KEY).getValue();
	}
	
	public Property getProperty(int index) {
		return properties.get(index);
	}
	
	@SuppressWarnings("unchecked")
	public  Property getProperty(String name) {
		for (Property property : properties) {
			if (property.getName().equals(name)) {
				return (Property) property;
			}
		}
		return null;
	}
	
	public String getRowKey() {
		return this.getProperty(Property.ROW_KEY).getValue();
	}
	
	public Date getTimestamp() {
		return this.getProperty(Property.TIMESTAMP).getValue();
	}
	
	@Override
	public Iterator> iterator() {
		return properties.iterator();
	}
	
	public void setPartitionKey(String partitionKey) {
		add(Property.newProperty(Property.PARTITION_KEY, partitionKey));
	}
	
	public void setRowKey(String rowKey) {
		add(Property.newProperty(Property.ROW_KEY, rowKey));
	}
	
	public void setTimestamp(Date date) {
		add(Property.newProperty(Property.TIMESTAMP, date));
	}
	
	private Vector> properties;
}