org.directwebremoting.io.ItemUpdate Maven / Gradle / Ivy
package org.directwebremoting.io;
/**
* Analogous to a {@link java.util.Map.Entry} that we use to pass objects that
* have been stored in a {@link org.directwebremoting.datasync.StoreProvider} to
* the Internet.
* TODO: Consider if we should add version field to this so we can add some sort
* of pessimistic locking to updates.
* @author Joe Walker [joe at getahead dot ltd dot uk]
*/
public class ItemUpdate
{
/**
* Create an Item with its ID and data.
* @param itemId ...
* @param attribute ...
* @param newValue ...
*/
public ItemUpdate(String itemId, String attribute, RawData newValue)
{
this.itemId = itemId;
this.attribute = attribute;
this.newValue = newValue;
}
/**
* Accessor for the primary key for this Object.
* Clearly not all database primary keys are Strings, my current feeling is
* that the majority of database primary keys can either be simply mapped to
* strings, or are a bad idea anyway.
* Warning: It would be a bad idea to expose database primary keys
* directly to the Internet anyway, so some form of mapping is required.
* @return The primary key for this Object
*/
public String getItemId()
{
return itemId;
}
/**
* Accessor for the property that we want to change on the Object with the
* ID given in itemId.
* @return ...
*/
public String getAttribute()
{
return attribute;
}
/**
* Accessor for the value for the attribute that we want to
* change on the Object with the ID given in itemId.
* @return ...
*/
public RawData getNewValue()
{
return newValue;
}
@Override
public int hashCode()
{
return 4783 + itemId.hashCode();
}
@Override
public boolean equals(Object obj)
{
if (obj == null)
{
return false;
}
if (obj == this)
{
return true;
}
if (!this.getClass().equals(obj.getClass()))
{
return false;
}
ItemUpdate that = (ItemUpdate) obj;
if (!this.itemId.equals(that.itemId))
{
return false;
}
return true;
}
/**
* @see #getItemId
*/
private final String itemId;
/**
* @see #getAttribute
*/
private final String attribute;
/**
* @see #getNewValue
*/
private final RawData newValue;
}