/**
* Return an expression that allows you to treat its base as if it were a subclass of the class
* returned by the base This can only be called on an ExpressionBuilder, the result of
* expression.get(String), expression.getAllowingNull(String), the result of
* expression.anyOf("String") or the result of expression.anyOfAllowingNull("String")
*
* <p>downcast uses Expression.type() internally to guarantee the results are of the specified
* class.
*
* <p>Example:
*
* <pre><blockquote>
* Expression: employee.get("project").as(LargeProject.class).get("budget").equal(1000)
* Java: ((LargeProject)employee.getProjects().get(0)).getBudget() == 1000
* SQL: LPROJ.PROJ_ID (+)= PROJ.PROJ_ID AND L_PROJ.BUDGET = 1000 AND PROJ.TYPE = "L"
* </blockquote></pre>
*/
@Override
public Expression treat(Class castClass) {
// to be used on expressionBuilders
QueryKeyExpression clonedExpression = new TreatAsExpression(castClass, this);
clonedExpression.shouldQueryToManyRelationship = false;
clonedExpression.hasQueryKey = false;
clonedExpression.hasMapping = false;
this.addDerivedExpression(clonedExpression);
return clonedExpression;
}
/**
* INTERNAL: Return if the expression is equal to the other. This is used to allow dynamic
* expression's SQL to be cached.
*/
public boolean equals(Object object) {
if (this == object) {
return true;
}
if (!super.equals(object)) {
return false;
}
QueryKeyExpression expression = (QueryKeyExpression) object;
// Return false for anyOf expressions, as equality is unknown.
if (shouldQueryToManyRelationship() || expression.shouldQueryToManyRelationship()) {
return false;
}
return ((getName() == expression.getName())
|| ((getName() != null) && getName().equals(expression.getName())));
}