001// Copyright 2004, 2005 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.hivemind.lib.pipeline;
016
017import java.util.Iterator;
018import java.util.List;
019
020import org.apache.hivemind.ErrorLog;
021import org.apache.hivemind.ServiceImplementationFactory;
022import org.apache.hivemind.ServiceImplementationFactoryParameters;
023import org.apache.hivemind.impl.BaseLocatable;
024import org.apache.hivemind.lib.DefaultImplementationBuilder;
025import org.apache.hivemind.service.ClassFactory;
026
027/**
028 * Service factory that builds a pipeline of objects.
029 * 
030 * @author Howard Lewis Ship
031 */
032public class PipelineFactory extends BaseLocatable implements ServiceImplementationFactory
033{
034    private ClassFactory _classFactory;
035
036    private DefaultImplementationBuilder _defaultImplementationBuilder;
037
038    /** @since 1.1 */
039    private ErrorLog _errorLog;
040
041    public Object createCoreServiceImplementation(
042            ServiceImplementationFactoryParameters factoryParameters)
043    {
044        PipelineParameters pp = (PipelineParameters) factoryParameters.getParameters().get(0);
045
046        PipelineAssembler pa = new PipelineAssembler(_errorLog, factoryParameters.getServiceId(),
047                factoryParameters.getServiceInterface(), pp.getFilterInterface(), _classFactory,
048                _defaultImplementationBuilder);
049
050        Object terminator = pp.getTerminator();
051
052        if (terminator != null)
053            pa.setTerminator(terminator, pp.getLocation());
054
055        List l = pp.getPipelineConfiguration();
056
057        Iterator i = l.iterator();
058        while (i.hasNext())
059        {
060            PipelineContribution c = (PipelineContribution) i.next();
061
062            c.informAssembler(pa);
063        }
064
065        return pa.createPipeline();
066    }
067
068    public void setClassFactory(ClassFactory factory)
069    {
070        _classFactory = factory;
071    }
072
073    public void setDefaultImplementationBuilder(DefaultImplementationBuilder builder)
074    {
075        _defaultImplementationBuilder = builder;
076    }
077
078    /** @since 1.1 */
079    public void setErrorLog(ErrorLog errorLog)
080    {
081        _errorLog = errorLog;
082    }
083}