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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.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();
}
}
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