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A Java library for transforming Google Transit Feed Spec feeds
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/**
 * Copyright (C) 2018 Cambridge Systematics, Inc.
 *
 * 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.onebusaway.gtfs_transformer.impl;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
 * useful input routines for strategies.
 */
public class InputLibrary {

    private final Logger _log = LoggerFactory.getLogger(InputLibrary.class);

    public List readList(String fileName) {
        List list = new ArrayList<>();
        if (fileName == null || fileName.length() == 0) return list;
        BufferedReader reader =  null;
        int count = 0;
        try {
            reader = new BufferedReader(new FileReader(fileName));

            String line = null;

            while ((line = reader.readLine()) != null) {
                String s = sanitize(line);
                if (s != null) {
                    list.add(s);
                    count++;
                }
            }
        } catch (FileNotFoundException e) {
            _log.error("failed to load stop ignore file={}", fileName, e);
            return list;
        } catch (IOException ioe) {
            _log.error("error reading stop ignore file={}", fileName, ioe);
        }

        _log.info("Successfully read {} entries from {}", count, fileName);
        return list;
    }

    public Map readOrderedMap(String fileName) {
        Map map = new LinkedHashMap<>();
        if (fileName == null || fileName.length() == 0) return map;
        BufferedReader reader = null;
        int count = 0;
        try {
            reader = new BufferedReader(new FileReader(fileName));

            String line = null;

            while ((line = reader.readLine()) != null) {
                String[] strings = line.split("\t");
                if (strings != null && strings.length > 1) {
                    count++;
                    String key = strings[0];
                    String value = strings[1];
                    map.put(sanitize(key), sanitize(value));
                }
            }
        } catch (FileNotFoundException e) {
            _log.error("failed to load stop mapping file={}", fileName, e);
            return map;
        } catch (IOException ioe) {
            _log.error("error reading mapping file {} = {}", fileName, ioe, ioe);
        }

        _log.info("Successfully read {} entries from {}", count, fileName);
        return map;
    }


    private String sanitize(String s) {
        if (s == null) return s;
        s = s.trim();
        s = s.replaceAll("^\"", "").replaceAll("\"$", "");
        return s;
    }

}