| // Copyright 2004 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry.parse; |
| |
| import java.util.Iterator; |
| |
| import org.apache.tapestry.Tapestry; |
| import org.apache.tapestry.spec.IBindingSpecification; |
| import org.apache.tapestry.spec.IComponentSpecification; |
| import org.apache.tapestry.spec.IContainedComponent; |
| import org.apache.tapestry.util.xml.DocumentParseException; |
| import org.xml.sax.Attributes; |
| |
| /** |
| * A rule for processing the copy-of attribute |
| * of the <component> element (in a page |
| * or component specification). |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * @since 3.0 |
| * |
| **/ |
| |
| public class ComponentCopyOfRule extends AbstractSpecificationRule |
| { |
| /** |
| * Validates that the element has either type or copy-of (not both, not neither). |
| * Uses the copy-of attribute to find a previously declared component |
| * and copies its type and bindings into the new component (on top of the stack). |
| * |
| **/ |
| |
| public void begin(String namespace, String name, Attributes attributes) throws Exception |
| { |
| String id = getValue(attributes, "id"); |
| String copyOf = getValue(attributes, "copy-of"); |
| String type = getValue(attributes, "type"); |
| |
| if (Tapestry.isBlank(copyOf)) |
| { |
| if (Tapestry.isBlank(type)) |
| throw new DocumentParseException( |
| Tapestry.format("SpecificationParser.missing-type-or-copy-of", id), |
| getResourceLocation()); |
| |
| return; |
| } |
| |
| if (Tapestry.isNonBlank(type)) |
| throw new DocumentParseException( |
| Tapestry.format("SpecificationParser.both-type-and-copy-of", id), |
| getResourceLocation()); |
| |
| IComponentSpecification spec = (IComponentSpecification) digester.getRoot(); |
| |
| IContainedComponent source = spec.getComponent(copyOf); |
| if (source == null) |
| throw new DocumentParseException( |
| Tapestry.format("SpecificationParser.unable-to-copy", copyOf), |
| getResourceLocation()); |
| |
| IContainedComponent target = (IContainedComponent) digester.peek(); |
| |
| target.setType(source.getType()); |
| target.setCopyOf(copyOf); |
| |
| Iterator i = source.getBindingNames().iterator(); |
| while (i.hasNext()) |
| { |
| String bindingName = (String) i.next(); |
| IBindingSpecification binding = source.getBinding(bindingName); |
| target.setBinding(bindingName, binding); |
| } |
| } |
| |
| } |