001/*
002 * VM-Operator
003 * Copyright (C) 2023 Michael N. Lipp
004 * 
005 * This program is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU Affero General Public License as
007 * published by the Free Software Foundation, either version 3 of the
008 * License, or (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
013 * GNU Affero General Public License for more details.
014 *
015 * You should have received a copy of the GNU Affero General Public License
016 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
017 */
018
019package org.jdrupes.vmoperator.runner.qemu.commands;
020
021import com.fasterxml.jackson.core.JsonProcessingException;
022import com.fasterxml.jackson.databind.JsonNode;
023import com.fasterxml.jackson.databind.ObjectMapper;
024import java.io.IOException;
025import java.util.logging.Level;
026import java.util.logging.Logger;
027
028/**
029 * The Class QmpCommand.
030 */
031public abstract class QmpCommand {
032
033    @SuppressWarnings({ "PMD.FieldNamingConventions" })
034    protected static final ObjectMapper mapper = new ObjectMapper();
035
036    /**
037     * Parses the json.
038     *
039     * @param json the json
040     * @return the json node
041     */
042    protected static JsonNode parseJson(String json) {
043        try {
044            return mapper.readValue(json, JsonNode.class);
045        } catch (IOException e) {
046            Logger.getLogger(QmpCommand.class.getName()).log(Level.SEVERE, e,
047                () -> "Cannot initialize class: " + e.getMessage());
048            return null;
049        }
050    }
051
052    /**
053     * Returns the Json to be sent to the Qemu process.
054     *
055     * @return the json node
056     */
057    public abstract JsonNode toJson();
058
059    /**
060     * Returns the string representation.
061     *
062     * @return the string
063     * @throws JsonProcessingException the JSON processing exception
064     */
065    public String asText() throws JsonProcessingException {
066        return mapper.writeValueAsString(toJson());
067    }
068
069    /**
070     * Calls {@link #asText()} but suppresses the 
071     * {@link JsonProcessingException}.
072     *
073     * @return the string
074     */
075    @Override
076    public String toString() {
077        try {
078            return asText();
079        } catch (JsonProcessingException e) {
080            return "(no string representation)";
081        }
082    }
083
084}