    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
    015package org.apache.tapestry5.internal.services.linktransform;
    016
    017import org.apache.tapestry5.Link;
    018import org.apache.tapestry5.services.ComponentEventLinkEncoder;
    019import org.apache.tapestry5.services.ComponentEventRequestParameters;
    020import org.apache.tapestry5.services.PageRenderRequestParameters;
    021import org.apache.tapestry5.services.Request;
    022import 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 */
    030public 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}