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/*
* 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.cassandra.cql3.selection;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.lang3.text.StrBuilder;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.ColumnDefinition;
import org.apache.cassandra.cql3.ColumnIdentifier;
import org.apache.cassandra.cql3.functions.*;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.db.marshal.UserType;
import org.apache.cassandra.exceptions.InvalidRequestException;
public abstract class Selectable
{
public abstract Selector.Factory newSelectorFactory(CFMetaData cfm, List defs)
throws InvalidRequestException;
protected static int addAndGetIndex(ColumnDefinition def, List l)
{
int idx = l.indexOf(def);
if (idx < 0)
{
idx = l.size();
l.add(def);
}
return idx;
}
public static interface Raw
{
public Selectable prepare(CFMetaData cfm);
/**
* Returns true if any processing is performed on the selected column.
**/
public boolean processesSelection();
}
public static class WritetimeOrTTL extends Selectable
{
public final ColumnIdentifier id;
public final boolean isWritetime;
public WritetimeOrTTL(ColumnIdentifier id, boolean isWritetime)
{
this.id = id;
this.isWritetime = isWritetime;
}
@Override
public String toString()
{
return (isWritetime ? "writetime" : "ttl") + "(" + id + ")";
}
public Selector.Factory newSelectorFactory(CFMetaData cfm,
List defs) throws InvalidRequestException
{
ColumnDefinition def = cfm.getColumnDefinition(id);
if (def == null)
throw new InvalidRequestException(String.format("Undefined name %s in selection clause", id));
if (def.isPrimaryKeyColumn())
throw new InvalidRequestException(
String.format("Cannot use selection function %s on PRIMARY KEY part %s",
isWritetime ? "writeTime" : "ttl",
def.name));
if (def.type.isCollection())
throw new InvalidRequestException(String.format("Cannot use selection function %s on collections",
isWritetime ? "writeTime" : "ttl"));
return WritetimeOrTTLSelector.newFactory(def, addAndGetIndex(def, defs), isWritetime);
}
public static class Raw implements Selectable.Raw
{
private final ColumnIdentifier.Raw id;
private final boolean isWritetime;
public Raw(ColumnIdentifier.Raw id, boolean isWritetime)
{
this.id = id;
this.isWritetime = isWritetime;
}
public WritetimeOrTTL prepare(CFMetaData cfm)
{
return new WritetimeOrTTL(id.prepare(cfm), isWritetime);
}
public boolean processesSelection()
{
return true;
}
}
}
public static class WithFunction extends Selectable
{
public final FunctionName functionName;
public final List args;
public WithFunction(FunctionName functionName, List args)
{
this.functionName = functionName;
this.args = args;
}
@Override
public String toString()
{
return new StrBuilder().append(functionName)
.append("(")
.appendWithSeparators(args, ", ")
.append(")")
.toString();
}
public Selector.Factory newSelectorFactory(CFMetaData cfm,
List defs) throws InvalidRequestException
{
SelectorFactories factories =
SelectorFactories.createFactoriesAndCollectColumnDefinitions(args, cfm, defs);
// We need to circumvent the normal function lookup process for toJson() because instances of the function
// are not pre-declared (because it can accept any type of argument).
Function fun;
if (functionName.equalsNativeFunction(ToJsonFct.NAME))
fun = ToJsonFct.getInstance(factories.getReturnTypes());
else
fun = Functions.get(cfm.ksName, functionName, factories.newInstances(), cfm.ksName, cfm.cfName, null);
if (fun == null)
throw new InvalidRequestException(String.format("Unknown function '%s'", functionName));
if (fun.returnType() == null)
throw new InvalidRequestException(String.format("Unknown function %s called in selection clause",
functionName));
return AbstractFunctionSelector.newFactory(fun, factories);
}
public static class Raw implements Selectable.Raw
{
private final FunctionName functionName;
private final List args;
public Raw(FunctionName functionName, List args)
{
this.functionName = functionName;
this.args = args;
}
public WithFunction prepare(CFMetaData cfm)
{
List preparedArgs = new ArrayList<>(args.size());
for (Selectable.Raw arg : args)
preparedArgs.add(arg.prepare(cfm));
return new WithFunction(functionName, preparedArgs);
}
public boolean processesSelection()
{
return true;
}
}
}
public static class WithFieldSelection extends Selectable
{
public final Selectable selected;
public final ColumnIdentifier field;
public WithFieldSelection(Selectable selected, ColumnIdentifier field)
{
this.selected = selected;
this.field = field;
}
@Override
public String toString()
{
return String.format("%s.%s", selected, field);
}
public Selector.Factory newSelectorFactory(CFMetaData cfm,
List defs) throws InvalidRequestException
{
Selector.Factory factory = selected.newSelectorFactory(cfm, defs);
AbstractType type = factory.newInstance().getType();
if (!(type instanceof UserType))
throw new InvalidRequestException(
String.format("Invalid field selection: %s of type %s is not a user type",
selected,
type.asCQL3Type()));
UserType ut = (UserType) type;
for (int i = 0; i < ut.size(); i++)
{
if (!ut.fieldName(i).equals(field.bytes))
continue;
return FieldSelector.newFactory(ut, i, factory);
}
throw new InvalidRequestException(String.format("%s of type %s has no field %s",
selected,
type.asCQL3Type(),
field));
}
public static class Raw implements Selectable.Raw
{
private final Selectable.Raw selected;
private final ColumnIdentifier.Raw field;
public Raw(Selectable.Raw selected, ColumnIdentifier.Raw field)
{
this.selected = selected;
this.field = field;
}
public WithFieldSelection prepare(CFMetaData cfm)
{
return new WithFieldSelection(selected.prepare(cfm), field.prepare(cfm));
}
public boolean processesSelection()
{
return true;
}
}
}
}