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 an {@link ActionLink},
024     *  {@link PageLink} or {@link DirectLink} component, but is most often used in
025     *  conjunction with an application-specific service.  
026     *
027     *  [<a href="../../../../../ComponentReference/ServiceLink.html">Component Reference</a>]
028     *
029     *  @author Howard Lewis Ship
030     *
031     **/
032    
033    public abstract class ServiceLink extends AbstractLinkComponent
034    {
035        public ILink getLink(IRequestCycle cycle)
036        {
037            Object[] parameters = DirectLink.constructServiceParameters(getParameters());
038            
039            return getServiceMap().getService(getService()).getLink(false, parameters);
040        }
041    
042        public abstract String getService();
043    
044        /**
045         * Injected.
046         * @since 4.1
047         */
048        public abstract ServiceMap getServiceMap();
049        
050        public abstract Object getParameters();
051    }