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Diffstat (limited to 'das-java/trunk/rdb/src/main/java/org/apache/tuscany/das/rdb/Converter.java')
-rw-r--r-- | das-java/trunk/rdb/src/main/java/org/apache/tuscany/das/rdb/Converter.java | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/das-java/trunk/rdb/src/main/java/org/apache/tuscany/das/rdb/Converter.java b/das-java/trunk/rdb/src/main/java/org/apache/tuscany/das/rdb/Converter.java new file mode 100644 index 0000000000..24f2e5ee2e --- /dev/null +++ b/das-java/trunk/rdb/src/main/java/org/apache/tuscany/das/rdb/Converter.java @@ -0,0 +1,54 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ +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); + +} |