001    // Copyright 2004, 2005 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.resolver;
016    
017    import org.apache.tapestry.INamespace;
018    import org.apache.tapestry.IRequestCycle;
019    import org.apache.tapestry.spec.IComponentSpecification;
020    
021    /**
022     * Delegate interface used when a page or component specification can not be found by the normal
023     * means. This allows hooks to support specifications from unusual locations, or generated on the
024     * fly.
025     * <p>
026     * The delegate must be coded in a threadsafe manner.
027     * 
028     * @author Howard Lewis Ship
029     * @since 3.0
030     */
031    
032    public interface ISpecificationResolverDelegate
033    {
034        /**
035         * Invoked by {@link PageSpecificationResolver} to find the indicated page specification.
036         * Returns the specification, or null. The specification, if returned, <em>will be cached</em>
037         * (this represents a change from release 3.0 to release 4.0).
038         * 
039         * @param cycle
040         *            used to gain access to framework and Servlet API objects
041         * @param namespace
042         *            the namespace containing the page
043         * @param simplePageName
044         *            the name of the page (without any namespace prefix)
045         */
046    
047        public IComponentSpecification findPageSpecification(IRequestCycle cycle, INamespace namespace,
048                String simplePageName);
049    
050        /**
051         * Invoked by {@link PageSpecificationResolver} to find the indicated component specification.
052         * Returns the specification, or null. The specification <em>will be cached</em> (this
053         * represents a change from release 3.0 to release 4.0).
054         * 
055         * @param cycle
056         *            used to gain access to framework and Servlet API objects
057         * @param namespace
058         *            the namespace containing the component
059         * @param type
060         *            the component type (without any namespace prefix)
061         */
062    
063        public IComponentSpecification findComponentSpecification(IRequestCycle cycle,
064                INamespace namespace, String type);
065    }