    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    }