oracle.toplink.essentials.internal.expressions.ExpressionOperatorConverter Maven / Gradle / Ivy
/*
* The contents of this file are subject to the terms
* of the Common Development and Distribution License
* (the "License"). You may not use this file except
* in compliance with the License.
*
* You can obtain a copy of the license at
* glassfish/bootstrap/legal/CDDLv1.0.txt or
* https://glassfish.dev.java.net/public/CDDLv1.0.html.
* See the License for the specific language governing
* permissions and limitations under the License.
*
* When distributing Covered Code, include this CDDL
* HEADER in each file and include the License file at
* glassfish/bootstrap/legal/CDDLv1.0.txt. If applicable,
* add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your
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// Copyright (c) 1998, 2007, Oracle. All rights reserved.
package oracle.toplink.essentials.internal.expressions;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.expressions.ExpressionOperator;
import oracle.toplink.essentials.internal.helper.Helper;
import oracle.toplink.essentials.mappings.converters.ObjectTypeConverter;
import oracle.toplink.essentials.sessions.Session;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
/**
* INTERNAL:
* Used by function operators in deployment xml generation to accomodate custom functions.
* There is no more validation on read because any custom function has to be accepted.
* The custom function is assumed to be a normal prefix function. The first element in the
* databaseStrings of the operator is in the format of databaseString(, e.g. AVG(. "(" will
* be removed on write and attached back on read.
*/
public class ExpressionOperatorConverter extends ObjectTypeConverter {
/**
* INTERNAL:
* Convert to the data value.
*/
public Object convertObjectValueToDataValue(Object attributeValue, Session session) {
Object fieldValue;
if (attributeValue == null) {
fieldValue = getAttributeToFieldValues().get(Helper.getNullWrapper());
} else {
fieldValue = getAttributeToFieldValues().get(attributeValue);
if (fieldValue == null) {
//Custom function. Remove "(".
if (((ExpressionOperator)attributeValue).getDatabaseStrings() != null) {
String databaseString = ((ExpressionOperator)attributeValue).getDatabaseStrings()[0];
fieldValue = databaseString.substring(0, databaseString.length()-1);
} else {
throw DescriptorException.noAttributeValueConversionToFieldValueProvided(attributeValue, getMapping());
}
}
}
return fieldValue;
}
/**
* INTERNAL:
* Returns the corresponding attribute value for the specified field value.
*/
public Object convertDataValueToObjectValue(Object fieldValue, Session session) {
Object attributeValue = null;
if (fieldValue == null) {
attributeValue = getFieldToAttributeValues().get(Helper.getNullWrapper());
} else {
try {
fieldValue = ((AbstractSession)session).getDatasourcePlatform().getConversionManager().convertObject(fieldValue, getFieldClassification());
} catch (ConversionException e) {
throw ConversionException.couldNotBeConverted(mapping, mapping.getDescriptor(), e);
}
attributeValue = getFieldToAttributeValues().get(fieldValue);
//Custom function. Create an operator for it.
if (attributeValue == null) {
attributeValue = ExpressionOperator.simpleFunction(0, (String)fieldValue);
}
}
return attributeValue;
}
}