reflex.file.CSVFileReadAdapterHeader.java Source code

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Here is the source code for reflex.file.CSVFileReadAdapterHeader.java

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/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2011-2016 Incapture Technologies LLC
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package reflex.file;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.google.common.net.MediaType;

import reflex.IReflexIOHandler;
import reflex.IReflexLineCallback;
import reflex.node.io.FileReadAdapter;
import reflex.value.ReflexStreamValue;
import reflex.value.ReflexValue;
import reflex.value.internal.ReflexVoidValue;

public class CSVFileReadAdapterHeader implements FileReadAdapter {
    private String fieldSep = ",";

    public CSVFileReadAdapterHeader(String param1, String param2) {
        if (param1 != null) {
            fieldSep = param1;
        }
    }

    @Override
    public ReflexValue readContent(ReflexStreamValue file, IReflexIOHandler ioHandler) {
        // The file is a series of CSV records, but we return an array of maps.
        // The first
        // line gives us the header values

        final List<ReflexValue> valArray = new ArrayList<ReflexValue>();
        final List<String> headerNames = new ArrayList<String>();

        ioHandler.forEachLine(file, new IReflexLineCallback() {

            @Override
            public ReflexValue callback(String line) {
                if (line.isEmpty()) {
                    return new ReflexVoidValue();
                }
                String[] splits = line.split(fieldSep);
                if (headerNames.isEmpty()) {
                    for (String h : splits) {
                        headerNames.add(h.trim());
                    }
                } else {
                    if (splits.length == headerNames.size()) {
                        Map<String, Object> lineMap = new HashMap<String, Object>();
                        for (int i = 0; i < splits.length; i++) {
                            lineMap.put(headerNames.get(i), new ReflexValue(splits[i]));
                        }
                        valArray.add(new ReflexValue(lineMap));
                    }
                }
                return new ReflexVoidValue();
            }

        });

        return new ReflexValue(valArray);
    }

    @Override
    public MediaType getMimeType() {
        return MediaType.CSV_UTF_8;
    }

}