com.hazelcast.org.apache.calcite.linq4j.QueryProviderImpl Maven / Gradle / Ivy
/*
* 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 com.hazelcast.org.apache.calcite.linq4j;
import com.hazelcast.org.apache.calcite.linq4j.tree.Expression;
import java.lang.reflect.Type;
/**
* Partial implementation of {@link QueryProvider}.
*
* Derived class needs to implement {@link #executeQuery}.
*/
public abstract class QueryProviderImpl implements QueryProvider {
/**
* Creates a QueryProviderImpl.
*/
protected QueryProviderImpl() {
super();
}
@Override public Queryable createQuery(Expression expression, Class rowType) {
return new QueryableImpl<>(this, rowType, expression);
}
@Override public Queryable createQuery(Expression expression, Type rowType) {
return new QueryableImpl<>(this, rowType, expression);
}
@Override public T execute(Expression expression, Class type) {
throw new UnsupportedOperationException();
}
@Override public T execute(Expression expression, Type type) {
throw new UnsupportedOperationException();
}
/**
* Binds an expression to this query provider.
*
* @param element type
*/
public static class QueryableImpl extends BaseQueryable {
public QueryableImpl(QueryProviderImpl provider, Type elementType,
Expression expression) {
super(provider, elementType, expression);
}
@Override public String toString() {
return "Queryable(expr=" + expression + ")";
}
}
}
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