org.ovirt.api.metamodel.tool.CsvBuffer Maven / Gradle / Ivy

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/*
Copyright (c) 2016 Red Hat, 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.ovirt.api.metamodel.tool;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.io.FileUtils;

/**
 * This class is a buffer intended to simplify generation of CSV files.
 */
public class CsvBuffer {
    // The output file:
    private File file;

    // The headers of the columns:
    private String[] headers;

    // The rows of the file:
    private List rows = new ArrayList<>();

    /**
     * Sets the output file.
     */
    public void setFile(File newFile) {
        file = newFile;
    }

    /**
     * Sets the headers.
     */
    public void setHeaders(String... newHeaders) {
        headers = newHeaders;
    }

    /**
     * Adds a row.
     */
    public void addRow(String... newRow) {
        rows.add(newRow);
    }

    /**
     * Writes the {@code .csv} file.
     *
     * @throws IOException if something fails while creating or writing the file
     */
    public void write() throws IOException {
        // Create the and all its parent if needed:
        FileUtils.forceMkdir(file.getParentFile());

        // Write the file:
        System.out.println("Writing CSV file \"" + file.getAbsolutePath() + "\".");
        try (PrintWriter writer = new PrintWriter(new OutputStreamWriter(new FileOutputStream(file), Charset.forName("UTF-8")))) {
            writeRow(writer, headers);
            for (String[] row : rows) {
                writeRow(writer, row);
            }
        }
    }

    private void writeRow(PrintWriter writer, String[] row) {
        boolean first = true;
        for (String col : row) {
            if (!first) {
                writer.print(',');
            }
            writer.print('\"');
            for (char c : col.toCharArray()) {
                if (c == '\"') {
                    writer.print(c);
                }
                writer.print(c);
            }
            writer.print('\"');
            first = false;
        }
        writer.println();
    }
}