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ProcedureProcessor.java
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ProcedureProcessor.java
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/*
* Copyright (c) 2002-2017 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.tooling.procedure;
import com.google.auto.service.AutoService;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Optional;
import java.util.Set;
import java.util.function.Function;
import java.util.stream.Stream;
import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.ProcessingEnvironment;
import javax.annotation.processing.Processor;
import javax.annotation.processing.RoundEnvironment;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.Element;
import javax.lang.model.element.ElementVisitor;
import javax.lang.model.element.TypeElement;
import javax.lang.model.util.Elements;
import javax.lang.model.util.Types;
import org.neo4j.procedure.Procedure;
import org.neo4j.tooling.procedure.messages.CompilationMessage;
import org.neo4j.tooling.procedure.messages.MessagePrinter;
import org.neo4j.tooling.procedure.validators.DuplicatedProcedureValidator;
import org.neo4j.tooling.procedure.visitors.StoredProcedureVisitor;
@AutoService( Processor.class )
public class ProcedureProcessor extends AbstractProcessor
{
public static final String IGNORE_CONTEXT_WARNINGS_OPTION = "IgnoreContextWarnings";
private static final Class<Procedure> sprocType = Procedure.class;
private final Set<Element> visitedProcedures = new LinkedHashSet<>();
private Function<Collection<Element>,Stream<CompilationMessage>> duplicationPredicate;
private ElementVisitor<Stream<CompilationMessage>,Void> visitor;
private MessagePrinter messagePrinter;
public static Optional<String> getCustomName( Procedure proc )
{
String name = proc.name();
if ( !name.isEmpty() )
{
return Optional.of( name );
}
String value = proc.value();
if ( !value.isEmpty() )
{
return Optional.of( value );
}
return Optional.empty();
}
@Override
public Set<String> getSupportedOptions()
{
return Collections.singleton( IGNORE_CONTEXT_WARNINGS_OPTION );
}
@Override
public Set<String> getSupportedAnnotationTypes()
{
return Collections.singleton( sprocType.getName() );
}
@Override
public SourceVersion getSupportedSourceVersion()
{
return SourceVersion.RELEASE_8;
}
@Override
public synchronized void init( ProcessingEnvironment processingEnv )
{
super.init( processingEnv );
Types typeUtils = processingEnv.getTypeUtils();
Elements elementUtils = processingEnv.getElementUtils();
visitedProcedures.clear();
messagePrinter = new MessagePrinter( processingEnv.getMessager() );
visitor = new StoredProcedureVisitor( typeUtils, elementUtils,
processingEnv.getOptions().containsKey( IGNORE_CONTEXT_WARNINGS_OPTION ) );
duplicationPredicate =
new DuplicatedProcedureValidator<>( elementUtils, sprocType, ProcedureProcessor::getCustomName );
}
@Override
public boolean process( Set<? extends TypeElement> annotations, RoundEnvironment roundEnv )
{
processElements( roundEnv );
if ( roundEnv.processingOver() )
{
duplicationPredicate.apply( visitedProcedures ).forEach( messagePrinter::print );
}
return false;
}
private void processElements( RoundEnvironment roundEnv )
{
Set<? extends Element> procedures = roundEnv.getElementsAnnotatedWith( sprocType );
visitedProcedures.addAll( procedures );
procedures.stream().flatMap( this::validate ).forEachOrdered( messagePrinter::print );
}
private Stream<CompilationMessage> validate( Element element )
{
return visitor.visit( element );
}
}