Source Code Cross Referenced for ComponentPageElement.java in  » Web-Framework » Tapestry » org » apache » tapestry » internal » structure » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » Tapestry » org.apache.tapestry.internal.structure 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // Copyright 2006, 2007 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.internal.structure;
016:
017:        import org.apache.tapestry.Block;
018:        import org.apache.tapestry.ComponentResources;
019:        import org.apache.tapestry.ComponentResourcesCommon;
020:        import org.apache.tapestry.internal.InternalComponentResources;
021:        import org.apache.tapestry.internal.InternalComponentResourcesCommon;
022:        import org.apache.tapestry.internal.services.Instantiator;
023:        import org.apache.tapestry.model.ParameterModel;
024:        import org.apache.tapestry.runtime.Component;
025:        import org.apache.tapestry.runtime.ComponentEvent;
026:        import org.apache.tapestry.runtime.RenderQueue;
027:        import org.apache.tapestry.services.PersistentFieldManager;
028:
029:        /**
030:         * Extended version of {@link org.apache.tapestry.internal.structure.PageElement} for elements that
031:         * are, in fact, components (rather than just static markup).
032:         */
033:        public interface ComponentPageElement extends ComponentResourcesCommon,
034:                InternalComponentResourcesCommon, PageElement, BodyPageElement {
035:            /**
036:             * Returns the core component associated with this page element (as opposed to any mixins
037:             * attached to the component).
038:             */
039:            Component getComponent();
040:
041:            /** Returns the resources associated with the core component. */
042:            InternalComponentResources getComponentResources();
043:
044:            /** Returns the page which contains this component. */
045:            Page getContainingPage();
046:
047:            /**
048:             * Containing component (or null for the root component of a page).
049:             */
050:            ComponentPageElement getContainerElement();
051:
052:            /**
053:             * Used during the construction of a page. Adds a page element as part of the template for this
054:             * page element. A page element will eventually render by sequentially rendering these elements.
055:             * A page elements template is really just the outermost portions of the component's template
056:             * ... where a template contains elements that are all components, those components will receive
057:             * portions of the template as their body.
058:             */
059:            void addToTemplate(PageElement element);
060:
061:            /**
062:             * Used during the contruction of a page to add a non-anonymous Block to the component.
063:             * 
064:             * @see ComponentResourcesCommon#getBlock(String)
065:             */
066:            void addBlock(String blockId, Block block);
067:
068:            /**
069:             * Adds a component to its container. The embedded component's id must be unique within the
070:             * container (after the id is converted to lower case).
071:             */
072:            void addEmbeddedElement(ComponentPageElement child);
073:
074:            /**
075:             * Adds a mixin.
076:             * 
077:             * @param instantiator
078:             *            used to instantiate an instance of the mixin
079:             */
080:            void addMixin(Instantiator instantiator);
081:
082:            /**
083:             * Retrieves a component page element by its id. The search is caseless.
084:             * 
085:             * @param id
086:             *            used to locate the element
087:             * @return the page element
088:             * @throws IllegalArgumentException
089:             *             if no component exists with the given id
090:             */
091:            ComponentPageElement getEmbeddedElement(String id);
092:
093:            /** Invoked when the component should render its body. */
094:            void enqueueBeforeRenderBody(RenderQueue queue);
095:
096:            /**
097:             * Asks each mixin and component to {@link Component#handleComponentEvent(ComponentEvent)},
098:             * returning true if any handler was found.
099:             * 
100:             * @param event
101:             *            to be handled
102:             * @return true if a handler was found
103:             */
104:            boolean handleEvent(ComponentEvent event);
105:
106:            /**
107:             * Searches the component (and its mixins) for a formal parameter matching the given name. If
108:             * found, the {@link ParameterModel#getDefaultBindingPrefix() default binding prefix} is
109:             * returned. Otherwise the parameter is an informal parameter, and null is returned.
110:             * 
111:             * @param parameterName
112:             *            the name of the parameter, possibly qualified with the mixin class name
113:             * @return the default binding prefix, or null
114:             */
115:            String getDefaultBindingPrefix(String parameterName);
116:
117:            /**
118:             * Posts a change to a persistent field. If the component is still loading, then this change is
119:             * ignored. Otherwise, it is propogated, via the
120:             * {@link Page#persistFieldChange(ComponentResources, String, Object) page} to the
121:             * {@link PersistentFieldManager#postChange(String, ComponentResources, String, Object) PersistentFieldManager}.
122:             */
123:            void persistFieldChange(ComponentResources resources,
124:                    String fieldName, Object newValue);
125:        }
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