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Scala version of Jinq's functional-style queries for JPA
package org.jinq.jpa.transform;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.jinq.jpa.jpqlquery.ColumnExpressions;
import org.jinq.jpa.jpqlquery.Expression;
import org.jinq.jpa.jpqlquery.FunctionExpression;
import org.jinq.jpa.jpqlquery.JPQLQuery;
import org.jinq.jpa.jpqlquery.RowReader;
import org.jinq.jpa.jpqlquery.ScalaTupleRowReader;
import org.jinq.jpa.jpqlquery.SelectFromWhere;
import org.jinq.jpa.jpqlquery.SelectOnly;
import org.jinq.jpa.jpqlquery.SimpleRowReader;
import org.jinq.jpa.jpqlquery.SubqueryExpression;
import ch.epfl.labos.iu.orm.queryll2.symbolic.LambdaFactory;
import ch.epfl.labos.iu.orm.queryll2.symbolic.MethodCallValue;
import ch.epfl.labos.iu.orm.queryll2.symbolic.MethodCallValue.StaticMethodCallValue;
import ch.epfl.labos.iu.orm.queryll2.symbolic.MethodSignature;
import ch.epfl.labos.iu.orm.queryll2.symbolic.TypedValue;
import ch.epfl.labos.iu.orm.queryll2.symbolic.TypedValue.GetFieldValue;
import ch.epfl.labos.iu.orm.queryll2.symbolic.TypedValueVisitorException;
public class ScalaSymbExToColumns extends SymbExToColumns
{
ScalaSymbExToColumns(JPQLQueryTransformConfiguration config,
SymbExArgumentHandler argumentHandler)
{
super(config, argumentHandler);
}
@Override public ColumnExpressions virtualMethodCallValue(MethodCallValue.VirtualMethodCallValue val, SymbExPassDown in) throws TypedValueVisitorException
{
MethodSignature sig = val.getSignature();
if (ScalaMetamodelUtil.newTuple2.equals(sig)
|| ScalaMetamodelUtil.newTuple3.equals(sig)
|| ScalaMetamodelUtil.newTuple4.equals(sig)
|| ScalaMetamodelUtil.newTuple5.equals(sig)
|| ScalaMetamodelUtil.newTuple8.equals(sig))
{
ColumnExpressions [] vals = new ColumnExpressions [val.args.size()];
// TODO: This is a little wonky passing down isExpectingConditional, but I think it's right for those times you create a tuple with booleans and then extract the booleans later
SymbExPassDown passdown = SymbExPassDown.with(val, in.isExpectingConditional);
for (int n = 0; n < vals.length; n++)
vals[n] = val.args.get(n).visit(this, passdown);
RowReader [] valReaders = new RowReader[vals.length];
for (int n = 0; n < vals.length; n++)
valReaders[n] = vals[n].reader;
ColumnExpressions toReturn = new ColumnExpressions<>(ScalaTupleRowReader.createReaderForTuple(sig.owner, valReaders));
for (int n = 0; n < vals.length; n++)
toReturn.columns.addAll(vals[n].columns);
return toReturn;
}
else if (ScalaMetamodelUtil.TUPLE_ACCESSORS.containsKey(sig))
{
int idx = ScalaMetamodelUtil.TUPLE_ACCESSORS.get(sig) - 1;
// TODO: This is a little wonky passing down isExpectingConditional, but I think it's right for those times you create a tuple with booleans and then extract the booleans later
SymbExPassDown passdown = SymbExPassDown.with(val, in.isExpectingConditional);
ColumnExpressions base = val.base.visit(this, passdown);
RowReader subreader = ((ScalaTupleRowReader)base.reader).getReaderForIndex(idx);
ColumnExpressions toReturn = new ColumnExpressions<>(subreader);
int baseOffset = ((ScalaTupleRowReader)base.reader).getColumnForIndex(idx);
for (int n = 0; n < subreader.getNumColumns(); n++)
toReturn.columns.add(base.columns.get(n + baseOffset));
return toReturn;
}
else if (sig.equals(ScalaMetamodelUtil.PREDEF_INT_TO_INTEGER)
|| sig.equals(ScalaMetamodelUtil.PREDEF_LONG_TO_LONG)
|| sig.equals(ScalaMetamodelUtil.PREDEF_DOUBLE_TO_DOUBLE)
|| sig.equals(ScalaMetamodelUtil.PREDEF_BOOLEAN_TO_BOOLEAN)
|| sig.equals(ScalaMetamodelUtil.PREDEF_INTEGER_TO_INT)
|| sig.equals(ScalaMetamodelUtil.PREDEF_LANGLONG_TO_LONG)
|| sig.equals(ScalaMetamodelUtil.PREDEF_LANGDOUBLE_TO_DOUBLE)
|| sig.equals(ScalaMetamodelUtil.PREDEF_LANGBOOLEAN_TO_BOOLEAN))
{
SymbExPassDown passdown = SymbExPassDown.with(val, in.isExpectingConditional);
ColumnExpressions base = val.args.get(0).visit(this, passdown);
return base;
}
else if (ScalaMetamodelUtil.isAggregateMethod(sig))
{
SymbExPassDown passdown = SymbExPassDown.with(val, false);
// Check out what stream we're aggregating
SymbExToSubQuery translator = config.newSymbExToSubQuery(argHandler, true);
JPQLQuery subQuery = val.base.visit(translator, passdown);
// Extract the lambda used
LambdaAnalysis lambda = null;
if (val.args.size() > 0)
{
TypedValue arg = val.args.get(0);
if ((arg instanceof LambdaFactory))
{
LambdaFactory lambdaFactory = (LambdaFactory)arg;
try {
lambda = LambdaAnalysis.analyzeMethod(config.metamodel, config.alternateClassLoader, config.isObjectEqualsSafe, config.isCollectionContainsSafe, lambdaFactory.getLambdaMethod(), lambdaFactory.getCapturedArgs(), true);
} catch (Exception e)
{
throw new TypedValueVisitorException("Could not analyze the lambda code", e);
}
}
else if (arg instanceof MethodCallValue.VirtualMethodCallValue && ((MethodCallValue.VirtualMethodCallValue)arg).isConstructor())
{
MethodCallValue.VirtualMethodCallValue lambdaConstructor = (MethodCallValue.VirtualMethodCallValue)arg;
try {
Map indirectParamMapping = config.findLambdaAsClassConstructorParameters(lambdaConstructor.getSignature(), lambdaConstructor.args);
lambda = LambdaAnalysis.analyzeClassAsLambda(config.metamodel, config.alternateClassLoader, config.isObjectEqualsSafe, config.isCollectionContainsSafe, new LambdaAnalysis.LambdaAsClassAnalysisConfig(), lambdaConstructor.getSignature().getOwnerType().getClassName(), indirectParamMapping, true);
} catch (Exception e)
{
throw new TypedValueVisitorException("Could not analyze the lambda code", e);
}
}
else
throw new TypedValueVisitorException("Expecting a lambda factory for aggregate method");
}
try {
AggregateTransform transform;
if (sig.equals(ScalaMetamodelUtil.streamSumInt)
|| sig.equals(ScalaMetamodelUtil.streamSumLong)
|| sig.equals(ScalaMetamodelUtil.streamSumDouble)
|| sig.equals(ScalaMetamodelUtil.streamSumBigDecimal)
|| sig.equals(ScalaMetamodelUtil.streamSumBigInteger))
transform = new AggregateTransform(config, AggregateTransform.AggregateType.SUM);
else if (sig.equals(ScalaMetamodelUtil.streamMax))
transform = new AggregateTransform(config, AggregateTransform.AggregateType.MAX);
else if (sig.equals(ScalaMetamodelUtil.streamMin))
transform = new AggregateTransform(config, AggregateTransform.AggregateType.MIN);
else if (sig.equals(ScalaMetamodelUtil.streamAvg))
transform = new AggregateTransform(config, AggregateTransform.AggregateType.AVG);
else if (sig.equals(ScalaMetamodelUtil.streamCount))
transform = new AggregateTransform(config, AggregateTransform.AggregateType.COUNT);
else
throw new TypedValueVisitorException("Unhandled aggregate operation");
JPQLQuery aggregatedQuery = transform.apply(subQuery, lambda, argHandler);
// Return the aggregated columns that we've now calculated
if (aggregatedQuery.getClass() == SelectOnly.class)
{
SelectOnly select = (SelectOnly)aggregatedQuery;
return select.cols;
}
else if (aggregatedQuery.isValidSubquery() && aggregatedQuery instanceof SelectFromWhere)
{
SelectFromWhere sfw = (SelectFromWhere)aggregatedQuery;
ColumnExpressions toReturn = new ColumnExpressions<>(sfw.cols.reader);
for (Expression col: sfw.cols.columns)
{
SelectFromWhere oneColQuery = sfw.shallowCopy();
oneColQuery.cols = ColumnExpressions.singleColumn(new SimpleRowReader<>(), col);
toReturn.columns.add(SubqueryExpression.from(oneColQuery));
}
return toReturn;
}
else
{
throw new TypedValueVisitorException("Unknown subquery type");
}
} catch (QueryTransformException e)
{
throw new TypedValueVisitorException("Could not derive an aggregate function for a lambda", e);
}
}
else if (sig.equals(ScalaMetamodelUtil.streamGetOnlyValue))
{
SymbExPassDown passdown = SymbExPassDown.with(val, false);
// Check out what stream we're aggregating
SymbExToSubQuery translator = config.newSymbExToSubQuery(argHandler, true);
JPQLQuery subQuery = val.base.visit(translator, passdown);
if (subQuery.isValidSubquery() && subQuery instanceof SelectFromWhere)
{
SelectFromWhere sfw = (SelectFromWhere)subQuery;
ColumnExpressions toReturn = new ColumnExpressions<>(sfw.cols.reader);
for (Expression col: sfw.cols.columns)
{
SelectFromWhere oneColQuery = sfw.shallowCopy();
oneColQuery.cols = ColumnExpressions.singleColumn(new SimpleRowReader<>(), col);
toReturn.columns.add(SubqueryExpression.from(oneColQuery));
}
return toReturn;
}
throw new TypedValueVisitorException("Cannot apply getOnlyValue() to the given subquery");
}
else if (sig.equals(ScalaMetamodelUtil.STRINGBUILDER_STRING))
{
List> concatenatedStrings = new ArrayList<>();
MethodCallValue.VirtualMethodCallValue baseVal = val;
while (true)
{
if (!(baseVal.base instanceof MethodCallValue.VirtualMethodCallValue))
throw new TypedValueVisitorException("Unexpected use of StringBuilder");
baseVal = (MethodCallValue.VirtualMethodCallValue)baseVal.base;
if (baseVal.getSignature().equals(ScalaMetamodelUtil.NEW_STRINGBUILDER_STRING))
{
SymbExPassDown passdown = SymbExPassDown.with(val, false);
concatenatedStrings.add(baseVal.args.get(0).visit(this, passdown));
break;
}
else if (baseVal.getSignature().equals(ScalaMetamodelUtil.NEW_STRINGBUILDER))
{
break;
}
else if (baseVal.getSignature().equals(ScalaMetamodelUtil.STRINGBUILDER_APPEND))
{
SymbExPassDown passdown = SymbExPassDown.with(val, false);
concatenatedStrings.add(baseVal.args.get(0).visit(this, passdown));
}
else
throw new TypedValueVisitorException("Unexpected use of StringBuilder");
}
if (concatenatedStrings.size() == 1)
return concatenatedStrings.get(0);
Expression head = concatenatedStrings.get(concatenatedStrings.size() - 1).getOnlyColumn();
for (int n = concatenatedStrings.size() - 2; n >= 0 ; n--)
head = FunctionExpression.twoParam("CONCAT", head, concatenatedStrings.get(n).getOnlyColumn());
return ColumnExpressions.singleColumn(new SimpleRowReader<>(), head);
}
else
return super.virtualMethodCallValue(val, in);
}
@Override
public ColumnExpressions staticMethodCallValue(StaticMethodCallValue val,
SymbExPassDown in) throws TypedValueVisitorException
{
MethodSignature sig = val.getSignature();
if (sig.equals(ScalaMetamodelUtil.BOX_TO_INTEGER)
|| sig.equals(ScalaMetamodelUtil.BOX_TO_LONG)
|| sig.equals(ScalaMetamodelUtil.BOX_TO_DOUBLE)
|| sig.equals(ScalaMetamodelUtil.BOX_TO_BOOLEAN)
|| sig.equals(ScalaMetamodelUtil.UNBOX_TO_INTEGER)
|| sig.equals(ScalaMetamodelUtil.UNBOX_TO_LONG)
|| sig.equals(ScalaMetamodelUtil.UNBOX_TO_DOUBLE)
|| sig.equals(ScalaMetamodelUtil.UNBOX_TO_BOOLEAN))
{
SymbExPassDown passdown = SymbExPassDown.with(val, in.isExpectingConditional);
ColumnExpressions base = val.args.get(0).visit(this, passdown);
return base;
}
return super.staticMethodCallValue(val, in);
}
@Override
public ColumnExpressions getFieldValue(GetFieldValue val,
SymbExPassDown in) throws TypedValueVisitorException
{
if (val.operand instanceof TypedValue.ThisValue)
{
return argHandler.handleThisFieldRead(val.name, val.getType());
}
return super.getFieldValue(val, in);
}
}
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