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package org.apache.cayenne.dba.derby;
import java.io.IOException;
import java.sql.Types;
import org.apache.cayenne.access.trans.QueryAssembler;
import org.apache.cayenne.access.trans.TrimmingQualifierTranslator;
import org.apache.cayenne.exp.parser.ASTEqual;
import org.apache.cayenne.exp.parser.ASTNotEqual;
import org.apache.cayenne.exp.parser.SimpleNode;
import org.apache.cayenne.exp.Expression;
import org.apache.cayenne.map.DbAttribute;
public class DerbyQualifierTranslator extends TrimmingQualifierTranslator {
public DerbyQualifierTranslator(QueryAssembler queryAssembler, String trimFunction) {
super(queryAssembler, trimFunction);
}
@Override
protected void processColumnWithQuoteSqlIdentifiers(
DbAttribute dbAttr,
Expression pathExp) throws IOException {
SimpleNode parent = null;
if (pathExp instanceof SimpleNode) {
parent = (SimpleNode) ((SimpleNode) pathExp).jjtGetParent();
}
// problem in derby : Comparisons between 'CLOB (UCS_BASIC)' and 'CLOB
// (UCS_BASIC)' are not supported.
// we need do it by casting the Clob to VARCHAR.
if (parent != null
&& (parent instanceof ASTEqual || parent instanceof ASTNotEqual)
&& dbAttr.getType() == Types.CLOB
&& parent.getOperandCount() == 2
&& parent.getOperand(1) instanceof String) {
Integer size = parent.getOperand(1).toString().length() + 1;
out.append("CAST(");
super.processColumnWithQuoteSqlIdentifiers(dbAttr, pathExp);
out.append(" AS VARCHAR(" + size + "))");
}
else {
super.processColumnWithQuoteSqlIdentifiers(dbAttr, pathExp);
}
}
}