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MethodSignatureCompilerTest.java
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MethodSignatureCompilerTest.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 org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import java.lang.reflect.Method;
import java.util.List;
import java.util.stream.Stream;
import org.neo4j.kernel.api.exceptions.ProcedureException;
import org.neo4j.kernel.api.proc.Neo4jTypes;
import org.neo4j.kernel.api.proc.ProcedureSignature.FieldSignature;
import org.neo4j.procedure.Name;
import org.neo4j.procedure.Procedure;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.contains;
public class MethodSignatureCompilerTest
{
@Rule
public ExpectedException exception = ExpectedException.none();
public static class MyOutputRecord
{
public String name;
public MyOutputRecord( String name )
{
this.name = name;
}
}
public static class UnmappableRecord
{
public UnmappableRecord wat;
}
public static class ClassWithProcedureWithSimpleArgs
{
@Procedure
public Stream<MyOutputRecord> echo( @Name("name") String in)
{
return Stream.of( new MyOutputRecord( in ));
}
@Procedure
public Stream<MyOutputRecord> echoWithoutAnnotations( @Name("name")String in1, String in2)
{
return Stream.of( new MyOutputRecord( in1 + in2 ));
}
@Procedure
public Stream<MyOutputRecord> echoWithInvalidType( @Name("name") UnmappableRecord in)
{
return Stream.of( new MyOutputRecord( "echo" ));
}
}
@Test
public void shouldMapSimpleRecordWithString() throws Throwable
{
// When
Method echo = ClassWithProcedureWithSimpleArgs.class.getMethod( "echo", String.class );
List<FieldSignature> signature = new MethodSignatureCompiler( new TypeMappers() ).signatureFor( echo );
// THen
assertThat(signature, contains( new FieldSignature("name", Neo4jTypes.NTString)));
}
@Test
public void shouldGiveHelpfulErrorOnUnmappable() throws Throwable
{
// Given
Method echo = ClassWithProcedureWithSimpleArgs.class.getMethod( "echoWithInvalidType", UnmappableRecord.class );
// Expect
exception.expect( ProcedureException.class );
exception.expectMessage( "Argument `name` at position 0 in `echoWithInvalidType` with\n" +
"type `UnmappableRecord` cannot be converted to a Neo4j type: Don't know how to map " +
"`class org.neo4j.kernel.impl.proc.MethodSignatureCompilerTest$UnmappableRecord` to " +
"the Neo4j Type System.\n" +
"Please refer to to the documentation for full details.\n" +
"For your reference, known types are:" );
// When
new MethodSignatureCompiler(new TypeMappers()).signatureFor( echo );
}
@Test
public void shouldGiveHelpfulErrorOnMissingAnnotations() throws Throwable
{
// Given
Method echo = ClassWithProcedureWithSimpleArgs.class.getMethod( "echoWithoutAnnotations", String.class, String.class);
// Expect
exception.expect( ProcedureException.class );
exception.expectMessage( "Argument at position 1 in method `echoWithoutAnnotations` is missing an `@Name` " +
"annotation.\n" +
"Please add the annotation, recompile the class and try again." );
// When
new MethodSignatureCompiler(new TypeMappers()).signatureFor( echo );
}
}