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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) 2013-2014 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.parser;

import java.text.ParsePosition;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.databene.edifatto.EdiFormatSymbols;
import org.databene.edifatto.EdifattoConfig;
import org.databene.edifatto.definition.MessageDefinition;
import org.databene.edifatto.model.Composite;
import org.databene.edifatto.model.EdiProtocol;
import org.databene.edifatto.model.Interchange;
import org.databene.edifatto.model.Message;
import org.databene.edifatto.model.Segment;

/**
 * Parses EDI interchanges.


 * Created: 10.10.2013 16:20:56
 * @since 1.0
 * @author Volker Bergmann
 */

public class EdifactParser extends AbstractEdiParser {
	
	public EdifactParser() {
		super(EdiProtocol.EDIFACT);
	}

	@Override
	protected EdiFormatSymbols determineSymbols(String text) {
		if (text.startsWith("UNA")) {
			char componentSep = text.charAt(3);
			char elementSep = text.charAt(4);
			char decimalSep = text.charAt(5);
			char escapeChar = text.charAt(6);
			char reserved = text.charAt(7);
			char segmentSep = text.charAt(8);
			return new EdiFormatSymbols(componentSep, elementSep, decimalSep, escapeChar, reserved, segmentSep);
		} else {
			return EdiFormatSymbols.EDIFACT;
		}
	}
	
	@Override
	protected Interchange parseSegments(List segments, EdiFormatSymbols symbols) {
		ParsePosition pos = new ParsePosition(0);
		Interchange interchange = new Interchange(EdiProtocol.EDIFACT, symbols);
		Segment una = parseOptionalSegment("UNA", segments, pos);
		if (una != null)
			interchange.addChild(una);
		return parseInterchange(segments, pos, interchange, new HashMap());
	}

	@Override
	protected Message parseRequiredMessage(List segments, ParsePosition pos, Map context) {
		Segment currentSegment = segments.get(pos.getIndex());
		AbstractEdiParser.requireTag(protocol.getMessageHeaderTag(), currentSegment);
		Composite spec = (Composite) currentSegment.getChild(1);
		String type = spec.getChild(0).getData();
		String version = spec.getChild(1).getData();
		String release = spec.getChild(2).getData();
		MessageDefinition messageDefinition = EdifattoConfig.getInstance().getMessageDefinition(EdiProtocol.EDIFACT, type, version, release);
		MessageParser messageParser = new MessageParser(messageDefinition);
		Message message = messageParser.parseMessage(segments, pos);
		return message;
	}

}