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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;

import org.databene.commons.ProgrammerError;
import org.databene.edifatto.model.Component;
import org.databene.edifatto.model.Composite;
import org.databene.edifatto.model.Segment;
import org.databene.edifatto.model.SegmentItem;

/**
 * Formats an EDI segment as text.
 * Created: 18.10.2013 16:30:15
 * @since 1.0
 * @author Volker Bergmann
 */

public class SegmentFormatter {
	
	private EdiFormatSymbols symbols;
	
	public SegmentFormatter(EdiFormatSymbols symbols) {
		this.symbols = symbols;
	}
	
	public String format(Segment segment) {
		if ("UNA".equals(segment.getTag()))
			return formatUNASegment(segment);
		else
			return formatStandardSegment(segment);
	}

	public static String formatUNASegment(Segment segment) {
		return "UNA" + ((Component) segment.getChild(0)).getData();
	}

	private String formatStandardSegment(Segment segment) {
		StringBuilder builder = new StringBuilder(segment.getTag()).append(symbols.elementSeparator);
		for (int iE = 0; iE < segment.getChildren().size(); iE++) {
			if (iE > 0)
				builder.append(symbols.elementSeparator);
			builder.append(format(segment.getChild(iE)));
		}
		return builder.append(symbols.segmentSeparator).toString();
	}
	
	public String format(SegmentItem item) {
		if (item instanceof Composite)
			return formatComposite((Composite) item);
		else if (item instanceof Component)
			return item.toString();
		else
			throw new ProgrammerError("Not a supported type: " + item.getClass());
	}

	private String formatComposite(Composite item) {
		StringBuilder builder = new StringBuilder();
		for (int iE = 0; iE < item.getChildCount(); iE++) {
			if (iE > 0)
				builder.append(symbols.componentSeparator);
			builder.append(item.getChild(iE));
		}
		return builder.toString();
	}
	
}