001// Copyright 2006, 2007, 2008, 2011 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.tapestry5.ioc.internal;
016
017import java.lang.reflect.Method;
018import java.util.Set;
019
020import org.apache.tapestry5.commons.AnnotationProvider;
021import org.apache.tapestry5.commons.ObjectCreator;
022import org.apache.tapestry5.commons.internal.services.AnnotationProviderChain;
023import org.apache.tapestry5.func.F;
024import org.apache.tapestry5.func.Flow;
025import org.apache.tapestry5.func.Mapper;
026import org.apache.tapestry5.ioc.ServiceBuilderResources;
027import org.apache.tapestry5.ioc.def.ServiceDef;
028import org.apache.tapestry5.ioc.def.ServiceDef3;
029import org.apache.tapestry5.ioc.internal.util.InternalUtils;
030
031public class ServiceDefImpl implements ServiceDef3
032{
033    private final Class serviceInterface;
034
035    private final Class serviceImplementation;
036
037    private final String serviceId;
038
039    private final String scope;
040
041    private final boolean eagerLoad;
042
043    private final ObjectCreatorSource source;
044
045    private final Set<Class> markers;
046
047    private final boolean preventDecoration;
048
049    /**
050     * @param serviceInterface
051     *            interface implemented by the service (or the service implementation class, for
052     *            non-proxied services)
053     * @param serviceImplementation
054     *            service implementation class if exists
055     * @param serviceId
056     *            unique id for the service
057     * @param markers
058     *            set of marker annotation classes (will be retained not copied)
059     * @param scope
060     *            scope of the service (i.e., {@link org.apache.tapestry5.ioc.ScopeConstants#DEFAULT}).
061     * @param eagerLoad
062     *            if true, the service is realized at startup, rather than on-demand
063     * @param preventDecoration
064     *            if true, the service may not be decorated
065     * @param source
066     *            used to create the service implementation when needed
067     */
068    ServiceDefImpl(Class serviceInterface, Class serviceImplementation, String serviceId, Set<Class> markers,
069            String scope, boolean eagerLoad, boolean preventDecoration, ObjectCreatorSource source)
070    {
071        this.serviceInterface = serviceInterface;
072        this.serviceImplementation = serviceImplementation;
073        this.serviceId = serviceId;
074        this.scope = scope;
075        this.eagerLoad = eagerLoad;
076        this.preventDecoration = preventDecoration;
077        this.source = source;
078
079        this.markers = markers;
080    }
081
082    @Override
083    public String toString()
084    {
085        return source.getDescription();
086    }
087
088    @Override
089    public ObjectCreator createServiceCreator(ServiceBuilderResources resources)
090    {
091        return source.constructCreator(resources);
092    }
093
094    @Override
095    public String getServiceId()
096    {
097        return serviceId;
098    }
099
100    @Override
101    public Class getServiceInterface()
102    {
103        return serviceInterface;
104    }
105
106    @Override
107    public Class getServiceImplementation()
108    {
109        return serviceImplementation;
110    }
111
112    @Override
113    public String getServiceScope()
114    {
115        return scope;
116    }
117
118    @Override
119    public boolean isEagerLoad()
120    {
121        return eagerLoad;
122    }
123
124    @Override
125    public Set<Class> getMarkers()
126    {
127        return markers;
128    }
129
130    @Override
131    public boolean isPreventDecoration()
132    {
133        return preventDecoration;
134    }
135
136    private Flow<Class> searchPath()
137    {
138        return F.flow(serviceImplementation, serviceInterface).removeNulls();
139    }
140
141    @Override
142    public AnnotationProvider getClassAnnotationProvider()
143    {
144        return AnnotationProviderChain.create(searchPath().map(InternalUtils.CLASS_TO_AP_MAPPER).toList());
145    }
146
147    @Override
148    public AnnotationProvider getMethodAnnotationProvider(final String methodName, final Class... argumentTypes)
149    {
150        return AnnotationProviderChain.create(searchPath().map(new Mapper<Class, Method>()
151        {
152            @Override
153            public Method map(Class element)
154            {
155                return InternalUtils.findMethod(element, methodName, argumentTypes);
156            }
157        }).map(InternalUtils.METHOD_TO_AP_MAPPER).toList());
158    }
159
160    @Override
161    public int hashCode()
162    {
163        final int prime = 31;
164        int result = 1;
165        result = prime * result + ((serviceId == null) ? 0 : serviceId.hashCode());
166        return result;
167    }
168
169    @Override
170    public boolean equals(Object obj)
171    {
172        if (this == obj) { return true; }
173        if (obj == null) { return false; }
174        if (!(obj instanceof ServiceDefImpl)) { return false; }
175        ServiceDef other = (ServiceDef) obj;
176        if (serviceId == null)
177        {
178            if (other.getServiceId() != null) { return false; }
179        }
180        else if (!serviceId.equals(other.getServiceId())) { return false; }
181        return true;
182    }
183    
184}