com.hazelcast.org.apache.calcite.server.DdlExecutorImpl Maven / Gradle / Ivy
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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 com.hazelcast.org.apache.calcite.server;
import com.hazelcast.org.apache.calcite.jdbc.CalcitePrepare;
import com.hazelcast.org.apache.calcite.sql.SqlNode;
import com.hazelcast.org.apache.calcite.util.ReflectUtil;
import com.hazelcast.org.apache.calcite.util.ReflectiveVisitor;
/** Abstract implementation of {@link com.hazelcast.org.apache.calcite.server.DdlExecutor}. */
public class DdlExecutorImpl implements DdlExecutor, ReflectiveVisitor {
/** Creates a DdlExecutorImpl.
* Protected only to allow sub-classing;
* use a singleton instance where possible. */
protected DdlExecutorImpl() {
}
/** Dispatches calls to the appropriate method based on the type of the
* first argument. */
@SuppressWarnings({"method.invocation.invalid", "argument.type.incompatible"})
private final ReflectUtil.MethodDispatcher dispatcher =
ReflectUtil.createMethodDispatcher(void.class, this, "execute",
SqlNode.class, CalcitePrepare.Context.class);
@Override public void executeDdl(CalcitePrepare.Context context,
SqlNode node) {
dispatcher.invoke(node, context);
}
/** Template for methods that execute DDL commands.
*
* The base implementation throws {@link UnsupportedOperationException}
* because a {@link SqlNode} is not DDL, but overloaded methods such as
* {@code public void execute(SqlCreateFoo, CalcitePrepare.Context)} are
* called via reflection. */
public void execute(SqlNode node, CalcitePrepare.Context context) {
throw new UnsupportedOperationException("DDL not supported: " + node);
}
}
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