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.services.impl;
016    
017    import org.apache.hivemind.Location;
018    import org.apache.tapestry.IComponent;
019    import org.apache.tapestry.INamespace;
020    import org.apache.tapestry.IRequestCycle;
021    import org.apache.tapestry.Tapestry;
022    import org.apache.tapestry.parse.ITemplateParserDelegate;
023    import org.apache.tapestry.resolver.ComponentSpecificationResolver;
024    import org.apache.tapestry.spec.IComponentSpecification;
025    
026    /**
027     * Default implementation of {@link org.apache.tapestry.parse.ITemplateParserDelegate}.
028     * 
029     * @author Howard Lewis Ship
030     * @since 4.0
031     */
032    public class DefaultParserDelegate implements ITemplateParserDelegate
033    {
034        private IComponent _component;
035    
036        private ComponentSpecificationResolver _resolver;
037    
038        private IRequestCycle _cycle;
039    
040        private String _componentAttributeName;
041    
042        public DefaultParserDelegate(IComponent component, String componentAttributeName,
043                IRequestCycle cycle, ComponentSpecificationResolver resolver)
044        {
045            _component = component;
046            _componentAttributeName = componentAttributeName;
047            _resolver = resolver;
048            _cycle = cycle;
049        }
050    
051        public boolean getKnownComponent(String componentId)
052        {
053            return _component.getSpecification().getComponent(componentId) != null;
054        }
055    
056        public boolean getAllowBody(String componentId, Location location)
057        {
058            IComponent embedded = _component.getComponent(componentId);
059    
060            if (embedded == null)
061                throw Tapestry.createNoSuchComponentException(_component, componentId, location);
062    
063            return embedded.getSpecification().getAllowBody();
064        }
065    
066        public boolean getAllowBody(String libraryId, String type, Location location)
067        {
068            INamespace namespace = _component.getNamespace();
069    
070            _resolver.resolve(_cycle, namespace, libraryId, type, location);
071    
072            IComponentSpecification spec = _resolver.getSpecification();
073    
074            return spec.getAllowBody();
075        }
076    
077        public String getComponentAttributeName()
078        {
079            return _componentAttributeName;
080        }
081    }