package org.apache.taverna.workbench.views.results.processor;
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

import java.util.Enumeration;

import javax.swing.tree.DefaultTreeModel;

import org.apache.taverna.workbench.views.results.SimpleFilteredTreeModel;
import org.apache.taverna.databundle.DataBundles;

@SuppressWarnings("serial")
public class FilteredProcessorValueTreeModel extends SimpleFilteredTreeModel {
	public enum FilterType {
		ALL {
			@Override
			public String toString() {
				return "view values";
			}
		},
		RESULTS {
			@Override
			public String toString() {
				return "view results";
			}
		},
		ERRORS {
			@Override
			public String toString() {
				return "view errors";
			}
		};
	}

	private FilterType filter;

	public FilteredProcessorValueTreeModel(DefaultTreeModel delegate) {
		super(delegate);
		this.filter = FilterType.ALL;
	}

	public void setFilter(FilterType filter) {
		this.filter = filter;
	}

	@Override
	public boolean isShown(Object o) {
		if (!(o instanceof ProcessorResultTreeNode))
			return false;
		ProcessorResultTreeNode node = (ProcessorResultTreeNode) o;
		if (node.getReference() == null)
			// root of the model
			return true;
		switch (filter) {
		case RESULTS:
			for (Enumeration<?> e = node.depthFirstEnumeration(); e
					.hasMoreElements();) {
				ProcessorResultTreeNode subNode = (ProcessorResultTreeNode) e
						.nextElement();
				if ((subNode.getReference() != null)
						&& !DataBundles.isError(subNode.getReference())) {
					return true;
				}
			}
			return false;
		case ERRORS:
			return DataBundles.isError(node.getReference());
		default:
			return true;
		}
	}
}