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
015package org.apache.tapestry.services.impl;
016
017import org.apache.hivemind.Location;
018import org.apache.tapestry.IComponent;
019import org.apache.tapestry.INamespace;
020import org.apache.tapestry.IRequestCycle;
021import org.apache.tapestry.Tapestry;
022import org.apache.tapestry.parse.ITemplateParserDelegate;
023import org.apache.tapestry.resolver.ComponentSpecificationResolver;
024import 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 */
032public 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}