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'Edifatto' is an open source software library for parsing, generating and verifying EDIFACT and X12 documents written by Volker Bergmann.

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/*
 * Copyright (C) 2013-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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.databene.edifatto.model;

import java.util.ArrayList;
import java.util.List;

/**
 * Provides common helper methods for navigation the EDI object tree.
 * Created: 22.10.2013 13:31:29
 * @since 1.0
 * @author Volker Bergmann
 */

public class ModelUtil {

	public static Segment getUniqueSegmentByTag(String tag, List children) {
		List results = getSegmentsByTag(tag, children);
		if (results.size() > 1)
			throw new AssertionError("Requested a single segment with tag = '" + tag + "', but found " + results.size() + " ones");
		else if (results.size() == 0)
			throw new AssertionError("No segment found with tag = '" + tag + "'");
		return results.get(0);
	}
	
	public static List getSegmentsByTag(String tag, List children) {
		List result = new ArrayList();
		for (EdiItem child : children)
			if (child instanceof Segment && ((Segment) child).getTag().equals(tag))
				result.add((Segment) child);
		return result;
	}

}