| /******************************************************************************* |
| * Copyright (c) 2010, 2019 IBM Corporation and others. |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jst.jsf.facelet.core.internal.cm; |
| |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| |
| import org.eclipse.wst.xml.core.internal.contentmodel.CMNamedNodeMap; |
| import org.eclipse.wst.xml.core.internal.contentmodel.CMNode; |
| |
| /** |
| * Represents information about Facelets brought from external sources such as |
| * the JSP tag library. |
| * |
| * @author cbateman |
| * |
| */ |
| public abstract class ExternalTagInfo extends TagInfo |
| { |
| /** |
| * Single instance of the null external tag info |
| */ |
| public static TagInfo NULL_INSTANCE = new NullExternalTagInfo(); |
| |
| @Override |
| public abstract CMNamedNodeMap getAttributes(final String tagName); |
| |
| @Override |
| public abstract Object getTagProperty(final String tagName, final String key); |
| |
| /** |
| * @author cbateman |
| * |
| */ |
| public static class NullExternalTagInfo extends ExternalTagInfo |
| { |
| private NullExternalTagInfo() |
| { |
| // no external instantitation |
| } |
| |
| @Override |
| public CMNamedNodeMap getAttributes(final String tagName) |
| { |
| return new NullCMNamedNodeMap(); |
| } |
| |
| @Override |
| public Object getTagProperty(final String tagName, final String key) |
| { |
| // no data so always null |
| return null; |
| } |
| |
| private static class NullCMNamedNodeMap implements CMNamedNodeMap |
| { |
| public int getLength() |
| { |
| return 0; |
| } |
| |
| public CMNode getNamedItem(final String name) |
| { |
| return null; |
| } |
| |
| public CMNode item(final int index) |
| { |
| return null; |
| } |
| |
| public Iterator iterator() |
| { |
| return new NullIterator(); |
| } |
| } |
| |
| private static class NullIterator implements Iterator |
| { |
| public boolean hasNext() |
| { |
| return false; |
| } |
| |
| public Object next() |
| { |
| throw new NoSuchElementException(); |
| } |
| |
| public void remove() |
| { |
| throw new UnsupportedOperationException( |
| "can not remove regions via iterator"); //$NON-NLS-1$ |
| } |
| } |
| } |
| |
| } |