Source Code Cross Referenced for ComponentResources.java in  » Library » Tapestry » org » apache » tapestry » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Tapestry » org.apache.tapestry 
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;
016:
017:        import org.apache.tapestry.ioc.AnnotationProvider;
018:        import org.apache.tapestry.ioc.Messages;
019:        import org.apache.tapestry.ioc.Resource;
020:        import org.apache.tapestry.model.ComponentModel;
021:        import org.apache.tapestry.runtime.Component;
022:
023:        /**
024:         * Provides a component instance with the resources provided by the framework. In many
025:         * circumstances, the resources object can be considered the component itself; in others, it is the
026:         * {@link #getComponent() component property}, and instance of a class provided by the application
027:         * developer (though transformed in many ways while being loaded) that is the true component. In
028:         * reality, it is the combination of the resources object with the lifecycle instance.
029:         */
030:        public interface ComponentResources extends ComponentResourcesCommon {
031:            /**
032:             * Returns the base resource for the component, which will represent the class's location within
033:             * the classpath (this is used to resolve relative assets).
034:             */
035:            Resource getBaseResource();
036:
037:            /** Returns the component model object that defines the behavior of the component. */
038:            ComponentModel getComponentModel();
039:
040:            /**
041:             * Returns the component this object provides resources for.
042:             */
043:            Component getComponent();
044:
045:            /**
046:             * Returns the component which contains this component, or null for the root component.
047:             */
048:            Component getContainer();
049:
050:            /**
051:             * Returns the {@link ComponentResources} for the container, or null if the this is the root
052:             * component (that has no container). As a special case, for a mixin, this returns the core
053:             * component's resources.
054:             */
055:            ComponentResources getContainerResources();
056:
057:            /**
058:             * Returns the {@link Messages} from the container, or null if this is the root component (with
059:             * no container). As a special case, for a mixin, this return the core component's messages.
060:             */
061:            Messages getContainerMessages();
062:
063:            /**
064:             * Returns the page that contains this component. Technically, the page itself is an internal
065:             * object in Tapestry and this returns the root component of the actual page, but from an
066:             * application developer point of view, this is the page.
067:             */
068:            Component getPage();
069:
070:            /**
071:             * Returns an embedded component, given the component's id.
072:             * 
073:             * @param embeddedId
074:             *            selects the embedded component (case is ignored)
075:             * @throws IllegalArgumentException
076:             *             if this component does not contain a component with the given id
077:             */
078:
079:            Component getEmbeddedComponent(String embeddedId);
080:
081:            /** Returns true if the named parameter is bound, false if not. */
082:            boolean isBound(String parameterName);
083:
084:            /**
085:             * Indentifies all parameters that are not formal parameters and writes each as a
086:             * attribute/value pair into the current element of the markup writer.
087:             * 
088:             * @param writer
089:             *            to which {@link MarkupWriter#attributes(Object[]) attributes} will be written
090:             */
091:            void renderInformalParameters(MarkupWriter writer);
092:
093:            /** Returns the message catalog for this component. */
094:            Messages getMessages();
095:
096:            /**
097:             * Returns the actual type of the bound parameter, or null if the parameter is not bound. This
098:             * is primarily used with property bindings, and is used to determine the actual type of the
099:             * property, rather than the type of parameter (remember that type coercion automatically
100:             * occurs, which can mask significant differences between the parameter type and the bound
101:             * property type).
102:             * 
103:             * @see Binding#getBindingType()
104:             * @param parameterName
105:             *            used to select the parameter (case is ignored)
106:             * @return the type of the bound parameter, or null if the parameter is not bound
107:             */
108:            Class getBoundType(String parameterName);
109:
110:            /**
111:             * Returns an annotation provider, used to obtain annotations related to the parameter.
112:             * 
113:             * @param parameterName
114:             *            used to select the parameter (case is ignored)
115:             * @return the annotation provider, or null if the parameter is not bound
116:             */
117:            AnnotationProvider getAnnotationProvider(String parameterName);
118:
119:            /**
120:             * Used to access an informal parameter that's a Block.
121:             * 
122:             * @param parameterName
123:             *            the name of the informal parameter (case is ignored)
124:             * @return the informal Block parameter, or null if not bound
125:             */
126:            Block getBlockParameter(String parameterName);
127:        }
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