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    
015    package org.apache.tapestry.link;
016    
017    import org.apache.tapestry.IRequestCycle;
018    import org.apache.tapestry.engine.ILink;
019    import org.apache.tapestry.services.ServiceMap;
020    
021    /**
022     *  A component for creating a link for an arbitrary {@link org.apache.tapestry.engine.IEngineService
023     *  engine service}.  A ServiceLink component can emulate a {@link PageLink} or {@link DirectLink} component, 
024     *  but is most often used in conjunction with an application-specific service.  
025     *
026     *  [<a href="../../../../../ComponentReference/ServiceLink.html">Component Reference</a>]
027     *
028     *  @author Howard Lewis Ship
029     *
030     **/
031    
032    public abstract class ServiceLink extends AbstractLinkComponent
033    {
034        public ILink getLink(IRequestCycle cycle)
035        {
036            Object[] parameters = DirectLink.constructServiceParameters(getParameters());
037            
038            return getServiceMap().getService(getService()).getLink(false, parameters);
039        }
040    
041        public abstract String getService();
042    
043        /**
044         * Injected.
045         * @since 4.1
046         */
047        public abstract ServiceMap getServiceMap();
048        
049        public abstract Object getParameters();
050    }