| /* |
| // Licensed to Julian Hyde under one or more contributor license |
| // agreements. See the NOTICE file distributed with this work for |
| // additional information regarding copyright ownership. |
| // |
| // Julian Hyde 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 net.hydromatic.linq4j; |
| |
| import net.hydromatic.linq4j.expressions.Expression; |
| |
| import java.lang.reflect.Type; |
| |
| /** |
| * Partial implementation of {@link QueryProvider}. |
| * |
| * <p>Derived class needs to implement {@link #executeQuery}.</p> |
| * |
| * @author jhyde |
| */ |
| public abstract class QueryProviderImpl implements QueryProvider { |
| /** |
| * Creates a QueryProviderImpl. |
| */ |
| public QueryProviderImpl() { |
| super(); |
| } |
| |
| public <T> Queryable<T> createQuery(Expression expression, Class<T> rowType) { |
| return new QueryableImpl<T>(this, rowType, expression); |
| } |
| |
| public <T> Queryable<T> createQuery(Expression expression, Type rowType) { |
| return new QueryableImpl<T>(this, rowType, expression); |
| } |
| |
| public <T> T execute(Expression expression, Class<T> type) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public <T> T execute(Expression expression, Type type) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Binds an expression to this query provider. |
| */ |
| public static class QueryableImpl<T> extends BaseQueryable<T> { |
| public QueryableImpl(QueryProviderImpl provider, Type elementType, |
| Expression expression) { |
| super(provider, elementType, expression); |
| } |
| |
| @Override |
| public String toString() { |
| return "Queryable(expr=" + expression + ")"; |
| } |
| } |
| } |
| |
| // End QueryProviderImpl.java |