org.apache.tapestry.ioc.internal.services.MasterObjectProviderImpl Maven / Gradle / Ivy

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// Copyright 2007 The Apache Software Foundation
//
// Licensed 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.tapestry.ioc.internal.services;

import org.apache.tapestry.ioc.AnnotationProvider;
import org.apache.tapestry.ioc.ObjectLocator;
import org.apache.tapestry.ioc.ObjectProvider;
import org.apache.tapestry.services.MasterObjectProvider;

import java.util.List;

public class MasterObjectProviderImpl implements MasterObjectProvider
{
    private final List _configuration;

    public MasterObjectProviderImpl(List configuration)
    {
        _configuration = configuration;
    }

    public  T provide(Class objectType, AnnotationProvider annotationProvider,
                         ObjectLocator locator, boolean required)
    {
        for (ObjectProvider provider : _configuration)
        {
            T result = provider.provide(objectType, annotationProvider, locator);

            if (result != null) return result;
        }

        // If required, then we must obtain it the hard way, by
        // seeing if there's a single service that implements the interface.

        if (required) return locator.getService(objectType);

        return null;
    }

}