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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.util;

import java.util.List;

import org.databene.edifatto.EdiFormatSymbols;

import freemarker.template.TemplateMethodModel;
import freemarker.template.TemplateModelException;

/**
 * FreeMarker template method that performs EDI-style character escaping.
 * Created: 18.12.2013 08:06:26
 * @since 1.0
 * @author Volker Bergmann
 */

public class EdiEscapeMethod implements TemplateMethodModel {
	
	private EdiFormatSymbols symbols;
	
	public EdiEscapeMethod(EdiFormatSymbols symbols) {
		this.symbols = symbols;
	}
	
	@SuppressWarnings("rawtypes")
	@Override
	public Object exec(List args) throws TemplateModelException {
		StringBuilder builder = new StringBuilder();
		for (int index = 0; index < args.size(); index++) {
			if (index > 0)
				builder.append(':');
			String s = String.valueOf(args.get(index));
			for (int i = 0; i < s.length(); i++) {
				char c = s.charAt(i);
				if (needsEscaping(c))
					builder.append(symbols.escapeChar);
				builder.append(c);
			}
		}
		return builder.toString();
	}

	private boolean needsEscaping(char c) {
		return (c == symbols.componentSeparator || c == symbols.elementSeparator || 
				c == symbols.escapeChar || c == symbols.segmentSeparator);
	}

}