001    // Copyright 2010 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.tapestry5.internal.services.linktransform;
016    
017    import org.apache.tapestry5.Link;
018    import org.apache.tapestry5.services.ComponentEventLinkEncoder;
019    import org.apache.tapestry5.services.ComponentEventRequestParameters;
020    import org.apache.tapestry5.services.PageRenderRequestParameters;
021    import org.apache.tapestry5.services.Request;
022    import org.apache.tapestry5.services.linktransform.LinkTransformer;
023    
024    /**
025     * Intercepts some methods of {@link ComponentEventLinkEncoder}, passing the returned {@link Link}s
026     * through methods of{@link LinkTransformer}.
027     * 
028     * @since 5.2.0
029     */
030    public class LinkTransformerInterceptor implements ComponentEventLinkEncoder
031    {
032        private final LinkTransformer linkTransformer;
033    
034        private final ComponentEventLinkEncoder delegate;
035    
036        public LinkTransformerInterceptor(LinkTransformer linkTransformer, ComponentEventLinkEncoder delegate)
037        {
038            this.linkTransformer = linkTransformer;
039            this.delegate = delegate;
040        }
041    
042        public Link createComponentEventLink(ComponentEventRequestParameters parameters, boolean forForm)
043        {
044            return linkTransformer.transformComponentEventLink(delegate.createComponentEventLink(parameters, forForm),
045                    parameters);
046        }
047    
048        public Link createPageRenderLink(PageRenderRequestParameters parameters)
049        {
050            return linkTransformer.transformPageRenderLink(delegate.createPageRenderLink(parameters), parameters);
051        }
052    
053        public ComponentEventRequestParameters decodeComponentEventRequest(Request request)
054        {
055            ComponentEventRequestParameters parameters = linkTransformer.decodeComponentEventRequest(request);
056    
057            if (parameters == null)
058                parameters = delegate.decodeComponentEventRequest(request);
059    
060            return parameters;
061        }
062    
063        public PageRenderRequestParameters decodePageRenderRequest(Request request)
064        {
065            PageRenderRequestParameters parameters = linkTransformer.decodePageRenderRequest(request);
066    
067            if (parameters == null)
068                parameters = delegate.decodePageRenderRequest(request);
069    
070            return parameters;
071        }
072    
073    }