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MethodSignatureCompiler.java
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MethodSignatureCompiler.java
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/*
* Copyright (c) 2002-2016 "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.kernel.impl.proc;
import java.lang.reflect.Method;
import java.lang.reflect.Parameter;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
import org.neo4j.kernel.api.exceptions.ProcedureException;
import org.neo4j.kernel.api.exceptions.Status;
import org.neo4j.kernel.api.proc.ProcedureSignature.FieldSignature;
import org.neo4j.messages.Messages;
import org.neo4j.procedure.Name;
import static org.neo4j.messages.Messages.proc_argument_missing_name;
import static org.neo4j.messages.Messages.proc_argument_name_empty;
import static org.neo4j.messages.Messages.proc_unmappable_argument_type;
/**
* Given a java method, figures out a valid {@link org.neo4j.kernel.api.proc.ProcedureSignature} field signature.
* Basically, it takes the java signature and spits out the same signature described as Neo4j types.
*/
public class MethodSignatureCompiler
{
private final TypeMappers typeMappers;
public MethodSignatureCompiler( TypeMappers typeMappers )
{
this.typeMappers = typeMappers;
}
public List<FieldSignature> signatureFor( Method method ) throws ProcedureException
{
Parameter[] params = method.getParameters();
Type[] types = method.getGenericParameterTypes();
List<FieldSignature> signature = new ArrayList<>(params.length);
for ( int i = 0; i < params.length; i++ )
{
Parameter param = params[i];
Type type = types[i];
if ( !param.isAnnotationPresent( Name.class ) )
{
throw new ProcedureException( Status.Procedure.FailedRegistration,
Messages.get( proc_argument_missing_name, i, method.getName(),
Name.class.getSimpleName()) );
}
String name = param.getAnnotation( Name.class ).value();
if( name.trim().length() == 0 )
{
throw new ProcedureException( Status.Procedure.FailedRegistration,
Messages.get( proc_argument_name_empty, i, method.getName() ) );
}
try
{
signature.add(new FieldSignature( name, typeMappers.neoTypeFor( type ) ));
}
catch ( ProcedureException e )
{
throw new ProcedureException( e.status(),
Messages.get( proc_unmappable_argument_type,
name, i, method.getName(), param.getType().getSimpleName(),
e.getMessage() ) );
}
}
return signature;
}
}