| /* |
| * 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.drill.exec.compile; |
| |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| import org.apache.drill.exec.compile.sig.SignatureHolder; |
| |
| /** |
| * Defines a code generation "template" which consist of: |
| * <ul> |
| * <li>An interface that defines the generated class.</li> |
| * <li>A template class which implements the interface to provide |
| * "generic" methods that need not be generated.</li> |
| * <li>A signature that lists the methods and vector holders used |
| * by the template.</li> |
| * </ul> |
| * |
| * @param <T> The template interface |
| */ |
| |
| public class TemplateClassDefinition<T>{ |
| |
| static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(TemplateClassDefinition.class); |
| |
| private final Class<T> iface; |
| private final Class<? extends T> template; |
| private final SignatureHolder signature; |
| private static final AtomicLong classNumber = new AtomicLong(0); |
| |
| public <X extends T> TemplateClassDefinition(Class<T> iface, Class<X> template) { |
| super(); |
| this.iface = iface; |
| this.template = template; |
| SignatureHolder holder = null; |
| try{ |
| holder = SignatureHolder.getHolder(template); |
| }catch(Exception ex){ |
| logger.error("Failure while trying to build signature holder for signature. {}", template.getName(), ex); |
| } |
| this.signature = holder; |
| } |
| |
| public long getNextClassNumber(){ |
| return classNumber.getAndIncrement(); |
| } |
| |
| public Class<T> getExternalInterface() { |
| return iface; |
| } |
| |
| public Class<? extends T> getTemplateClass() { |
| return template; |
| } |
| |
| public String getTemplateClassName() { |
| return template.getName(); |
| } |
| |
| public SignatureHolder getSignature(){ |
| return signature; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder buf = new StringBuilder(); |
| buf.append("TemplateClassDefinition [interface="); |
| buf.append((iface == null) ? "null" : iface.getName()); |
| buf.append(", template="); |
| buf.append((template == null) ? "null" : template.getName()); |
| buf.append(", signature=\n"); |
| buf.append(signature); |
| buf.append("]"); |
| return buf.toString(); |
| } |
| } |