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The following page has been changed by KevinWilliams: http://wiki.apache.org/ws/ColumnConverters ------------------------------------------------------------------------------ - Sometimes it is desireable to modify a column value retreived from a database column '''before''' it is stored into a !DataObject property. + Sometimes it is desireable to modify a column value retreived from a database column '''before''' it is stored into a !DataObject property. One example might be a database column with possible values '0' or '1' but the desired !DataObject property is 'false' or 'true'. Another example might be a String property that should be obfuscated or encryted before it is stored into a column. + The RDB DAS provides a simple "converter" framework that can be used for these cases and others. To use this framework the application developer must provide a new Converter class to provide the desired transformations from column to property and from property back to column. The provided converter must implement the following interface: + {{{ + package org.apache.tuscany.das.rdb; + + /** + * A lightweight Table-column <--> DataObject-property converter framework. Converters allow a user to + * insert a transformation between a column value and is destination DataObject property value. For example, by default, a VARCHAR column will be represented as a String in its corresponding + * DataObject property. A user could insert a converter that transforms the the VARCHAR value to an Integer. If this is done then although the column + * returns character data, the DataObject property will be an Integer + * + * + */ + public interface Converter { + + /** + * Transform the columnData object to a new value and possibly new type. This should be the invers operation of #getColumnValue + * + * @param columnData + * The column value to transorm + * @return Returns the transformed value + */ + Object getPropertyValue(Object columnData); + + /** + * Transform the columnData object to a new value and possibly new type. This should be the invers operation of #getPropertyValue + * + * @param propertyData + * The property value to transform + * @return Returns the transformed value + */ + Object getColumnValue(Object propertyData); + + } + + }}} + --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
