core/api/src/main/java/org/apache/polygene/api/service/NoSuchServiceException.java

/*
 *  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.polygene.api.service;

import java.util.stream.Collectors;
import org.apache.polygene.api.composite.CompositeDescriptor;
import org.apache.polygene.api.composite.ModelDescriptor;
import org.apache.polygene.api.composite.NoSuchCompositeException;
import org.apache.polygene.api.structure.TypeLookup;

/**
 * Thrown when no visible service of the requested type is found.
 */
public class NoSuchServiceException extends NoSuchCompositeException
{
    public NoSuchServiceException( String typeName, String moduleName, TypeLookup typeLookup )
    {
        super( "ServiceComposite", typeName, moduleName, formatVisibleTypes( typeLookup ) );
    }

    private static String formatVisibleTypes( TypeLookup typeLookup )
    {
        return typeLookup.allServices()
            .map( NoSuchServiceException::typeOf )
            .collect( Collectors.joining( "\n", "Visible service types are:\n", "" ) );
    }

    private static String typeOf( ModelDescriptor descriptor )
    {
        if( descriptor instanceof CompositeDescriptor )
        {
            return ( (CompositeDescriptor) descriptor ).primaryType().getName();
        }
        return descriptor.types()
                         .map( Class::getName )
                         .sorted()
                         .distinct()
                         .collect( Collectors.joining( ",", "[", "]") );
    }
}