adams.gui.tools.previewbrowser.JsonPrettyPrintHandler.java Source code

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Here is the source code for adams.gui.tools.previewbrowser.JsonPrettyPrintHandler.java

Source

/*
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * JsonPrettyPrintHandler.java
 * Copyright (C) 2016 University of Waikato, Hamilton, New Zealand
 */
package adams.gui.tools.previewbrowser;

import adams.core.Utils;
import adams.core.io.FileUtils;
import adams.gui.core.TextEditorPanel;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;

/**
 <!-- globalinfo-start -->
 * Displays JSON files in pretty print format: json
 * <br><br>
 <!-- globalinfo-end -->
 *
 <!-- options-start -->
 * <pre>-logging-level &lt;OFF|SEVERE|WARNING|INFO|CONFIG|FINE|FINER|FINEST&gt; (property: loggingLevel)
 * &nbsp;&nbsp;&nbsp;The logging level for outputting errors and debugging output.
 * &nbsp;&nbsp;&nbsp;default: WARNING
 * </pre>
 * 
 <!-- options-end -->
 *
 * @author  fracpete (fracpete at waikato dot ac dot nz)
 * @version $Revision: 13654 $
 */
public class JsonPrettyPrintHandler extends AbstractContentHandler {

    /** for serialization. */
    private static final long serialVersionUID = -5643331918040646266L;

    /**
     * Returns a string describing the object.
     *
     * @return          a description suitable for displaying in the gui
     */
    @Override
    public String globalInfo() {
        return "Displays JSON files in pretty print format: " + Utils.arrayToString(getExtensions());
    }

    /**
     * Returns the list of extensions (without dot) that this handler can
     * take care of.
     *
     * @return      the list of extensions (no dot)
     */
    @Override
    public String[] getExtensions() {
        return new String[] { "json" };
    }

    /**
     * Creates the actual view.
     *
     * @param file   the file to create the view for
     * @return      the view
     */
    @Override
    protected PreviewPanel createPreview(File file) {
        PreviewPanel result;
        TextEditorPanel textPanel;
        FileReader freader;
        BufferedReader breader;
        Gson gson;
        JsonParser jp;
        JsonElement je;
        String content;

        freader = null;
        breader = null;
        try {
            freader = new FileReader(file.getAbsolutePath());
            breader = new BufferedReader(freader);
            gson = new GsonBuilder().setPrettyPrinting().create();
            jp = new JsonParser();
            je = jp.parse(breader);
            content = gson.toJson(je);
            textPanel = new TextEditorPanel();
            textPanel.setContent(content);
            textPanel.setEditable(false);
            result = new PreviewPanel(textPanel, textPanel.getTextArea());
        } catch (Exception e) {
            textPanel = new TextEditorPanel();
            textPanel.open(file);
            textPanel.setEditable(false);
            result = new PreviewPanel(textPanel, textPanel.getTextArea());
        } finally {
            FileUtils.closeQuietly(breader);
            FileUtils.closeQuietly(freader);
        }

        return result;
    }
}