001// Copyright 2006, 2007, 2008, 2009, 2010, 2011 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;
016
017import java.util.List;
018
019import org.apache.tapestry5.Link;
020import org.apache.tapestry5.internal.TapestryInternalUtils;
021import org.apache.tapestry5.internal.structure.Page;
022import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
023import org.apache.tapestry5.ioc.internal.util.InternalUtils;
024import org.apache.tapestry5.ioc.services.TypeCoercer;
025import org.apache.tapestry5.services.ComponentClassResolver;
026import org.apache.tapestry5.services.ComponentEventLinkEncoder;
027import org.apache.tapestry5.services.ComponentEventRequestParameters;
028import org.apache.tapestry5.services.LinkCreationHub;
029import org.apache.tapestry5.services.LinkCreationListener;
030import org.apache.tapestry5.services.LinkCreationListener2;
031import org.apache.tapestry5.services.PageRenderRequestParameters;
032import org.apache.tapestry5.services.RequestGlobals;
033
034@SuppressWarnings("all")
035public class LinkSourceImpl implements LinkSource, LinkCreationHub
036{
037    private final PageRenderQueue pageRenderQueue;
038
039    private final PageActivationContextCollector contextCollector;
040
041    private final ComponentEventLinkEncoder linkEncoder;
042
043    private final List<LinkCreationListener2> listeners = CollectionFactory.newThreadSafeList();
044
045    private final TypeCoercer typeCoercer;
046
047    private final ComponentClassResolver resolver;
048
049    private final RequestGlobals requestGlobals;
050
051    private final RequestPageCache pageCache;
052
053    public LinkSourceImpl(PageRenderQueue pageRenderQueue, PageActivationContextCollector contextCollector,
054            TypeCoercer typeCoercer, ComponentClassResolver resolver, ComponentEventLinkEncoder linkEncoder,
055            RequestGlobals requestGlobals, RequestPageCache pageCache, List<LinkCreationListener2> configuration)
056    {
057        this.pageRenderQueue = pageRenderQueue;
058        this.contextCollector = contextCollector;
059        this.typeCoercer = typeCoercer;
060        this.resolver = resolver;
061        this.linkEncoder = linkEncoder;
062        this.requestGlobals = requestGlobals;
063        this.pageCache = pageCache;
064
065        listeners.addAll(configuration);
066    }
067
068    public Link createComponentEventLink(Page page, String nestedId, String eventType, boolean forForm,
069            Object... eventContext)
070    {
071        assert page != null;
072        assert InternalUtils.isNonBlank(eventType);
073
074        Page activePage = pageRenderQueue.getRenderingPage();
075
076        // See TAPESTRY-2184
077        if (activePage == null)
078            activePage = page;
079
080        String activePageName = activePage.getName();
081
082        Object[] pageActivationContext = contextCollector.collectPageActivationContext(activePageName);
083
084        ComponentEventRequestParameters parameters = new ComponentEventRequestParameters(activePageName,
085                page.getName(), toBlank(nestedId), eventType,
086                new ArrayEventContext(typeCoercer, pageActivationContext), new ArrayEventContext(typeCoercer,
087                        eventContext));
088
089        Link link = linkEncoder.createComponentEventLink(parameters, forForm);
090
091        for (LinkCreationListener2 listener : listeners)
092            listener.createdComponentEventLink(link, parameters);
093
094        return link;
095    }
096
097    private String toBlank(String input)
098    {
099        return input == null ? "" : input;
100    }
101
102    public Link createPageRenderLink(String pageName, boolean override, Object... pageActivationContext)
103    {
104        // Resolve the page name to its canonical format (the best version for URLs). This also
105        // validates
106        // the page name.
107
108        String canonical = resolver.canonicalizePageName(pageName);
109
110        Object[] context = (override || pageActivationContext.length != 0) ? pageActivationContext : contextCollector
111                .collectPageActivationContext(canonical);
112
113        boolean loopback = canonical.equals(requestGlobals.getActivePageName())
114                && pageCache.get(pageName).hasResetListeners();
115
116        PageRenderRequestParameters parameters = new PageRenderRequestParameters(canonical, new ArrayEventContext(
117                typeCoercer, context), loopback);
118
119        Link link = linkEncoder.createPageRenderLink(parameters);
120
121        for (LinkCreationListener2 listener : listeners)
122            listener.createdPageRenderLink(link, parameters);
123
124        return link;
125    }
126
127    public LinkCreationHub getLinkCreationHub()
128    {
129        return this;
130    }
131
132    public void addListener(LinkCreationListener listener)
133    {
134        assert listener != null;
135
136        addListener(TapestryInternalUtils.toLinkCreationListener2(listener));
137    }
138
139    public void addListener(LinkCreationListener2 listener)
140    {
141        assert listener != null;
142
143        listeners.add(listener);
144    }
145}