ScriptService.java

/*
 Copyright 2014 Groupon, 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 com.groupon.odo.proxylib;

import com.groupon.odo.proxylib.models.Script;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ScriptService {
    private static final Logger logger = LoggerFactory.getLogger(ScriptService.class);

    private static ScriptService _instance = null;

    public ScriptService() {

    }

    /**
     * Get instance of ScriptService
     *
     * @return ScriptService instance
     */
    public static ScriptService getInstance() {
        if (_instance == null) {
            _instance = new ScriptService();
        }

        return _instance;
    }

    private Script scriptFromSQLResult(ResultSet result) throws Exception {
        Script script = new Script();

        script.setId(result.getInt("id"));
        script.setName(result.getString("name"));
        script.setScript(result.getString("script"));

        return script;
    }

    /**
     * Get the script for a given ID
     *
     * @param id ID of script
     * @return Script if found, otherwise null
     */
    public Script getScript(int id) {
        PreparedStatement statement = null;
        ResultSet results = null;

        try (Connection sqlConnection = SQLService.getInstance().getConnection()) {
            statement = sqlConnection.prepareStatement(
                "SELECT * FROM " + Constants.DB_TABLE_SCRIPT +
                    " WHERE id = ?"
            );
            statement.setInt(1, id);
            results = statement.executeQuery();
            if (results.next()) {
                return scriptFromSQLResult(results);
            }
        } catch (Exception e) {

        } finally {
            try {
                if (results != null) {
                    results.close();
                }
            } catch (Exception e) {
            }
            try {
                if (statement != null) {
                    statement.close();
                }
            } catch (Exception e) {
            }
        }

        return null;
    }

    /**
     * Return all scripts
     *
     * @return array of Script
     */
    public Script[] getScripts() {
        return getScripts(null);
    }

    /**
     * Return all scripts of a given type
     *
     * @param type integer value of type
     * @return Array of scripts of the given type
     */
    public Script[] getScripts(Integer type) {
        ArrayList<Script> returnData = new ArrayList<>();
        PreparedStatement statement = null;
        ResultSet results = null;

        try (Connection sqlConnection = SQLService.getInstance().getConnection()) {

            statement = sqlConnection.prepareStatement("SELECT * FROM " + Constants.DB_TABLE_SCRIPT +
                                                           " ORDER BY " + Constants.GENERIC_ID);
            if (type != null) {
                statement = sqlConnection.prepareStatement("SELECT * FROM " + Constants.DB_TABLE_SCRIPT +
                                                               " WHERE " + Constants.SCRIPT_TYPE + "= ?" +
                                                               " ORDER BY " + Constants.GENERIC_ID);
                statement.setInt(1, type);
            }

            logger.info("Query: {}", statement);

            results = statement.executeQuery();
            while (results.next()) {
                returnData.add(scriptFromSQLResult(results));
            }
        } catch (Exception e) {

        } finally {
            try {
                if (results != null) {
                    results.close();
                }
            } catch (Exception e) {
            }
            try {
                if (statement != null) {
                    statement.close();
                }
            } catch (Exception e) {
            }
        }

        return returnData.toArray(new Script[0]);
    }

    /**
     * Add a script
     * TODO: Make this take type as a param
     *
     * @param name - name of script
     * @param script - script
     * @return Newly-added script
     * @throws Exception exception
     */
    public Script addScript(String name, String script) throws Exception {
        int id = -1;
        PreparedStatement statement = null;
        ResultSet results = null;

        try (Connection sqlConnection = SQLService.getInstance().getConnection()) {
            statement = sqlConnection.prepareStatement(
                "INSERT INTO " + Constants.DB_TABLE_SCRIPT
                    + "(" + Constants.SCRIPT_NAME + "," + Constants.SCRIPT_SCRIPT + "," + Constants.SCRIPT_TYPE + ")"
                    + " VALUES (?, ?, ?)", PreparedStatement.RETURN_GENERATED_KEYS
            );
            statement.setString(1, name);
            statement.setString(2, script);
            statement.setInt(3, 0);
            statement.executeUpdate();

            // execute statement and get resultSet which will have the generated path ID as the first field
            results = statement.getGeneratedKeys();

            if (results.next()) {
                id = results.getInt(1);
            } else {
                // something went wrong
                throw new Exception("Could not add script");
            }
        } catch (SQLException e) {
            throw e;
        } finally {
            try {
                if (results != null) {
                    results.close();
                }
            } catch (Exception e) {
            }
            try {
                if (statement != null) {
                    statement.close();
                }
            } catch (Exception e) {
            }
        }

        return this.getScript(id);
    }

    /**
     * Update the name of a script
     *
     * @param id ID of script
     * @param name new name
     * @return updated script
     * @throws Exception exception
     */
    public Script updateName(int id, String name) throws Exception {
        PreparedStatement statement = null;

        try (Connection sqlConnection = SQLService.getInstance().getConnection()) {
            statement = sqlConnection.prepareStatement(
                "UPDATE " + Constants.DB_TABLE_SCRIPT +
                    " SET " + Constants.SCRIPT_NAME + " = ? " +
                    " WHERE " + Constants.GENERIC_ID + " = ?"
            );
            statement.setString(1, name);
            statement.setInt(2, id);
            statement.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (statement != null) {
                    statement.close();
                }
            } catch (Exception e) {
            }
        }

        return this.getScript(id);
    }

    /**
     * Update a script
     *
     * @param id ID of script
     * @param script Script contents
     * @return updated script
     * @throws Exception exception
     */
    public Script updateScript(int id, String script) throws Exception {
        PreparedStatement statement = null;

        try (Connection sqlConnection = SQLService.getInstance().getConnection()) {
            statement = sqlConnection.prepareStatement(
                "UPDATE " + Constants.DB_TABLE_SCRIPT +
                    " SET " + Constants.SCRIPT_SCRIPT + " = ? " +
                    " WHERE " + Constants.GENERIC_ID + " = ?"
            );
            statement.setString(1, script);
            statement.setInt(2, id);
            statement.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (statement != null) {
                    statement.close();
                }
            } catch (Exception e) {
            }
        }

        return this.getScript(id);
    }

    /**
     * Remove script for a given ID
     *
     * @param id ID of script
     * @throws Exception exception
     */
    public void removeScript(int id) throws Exception {
        PreparedStatement statement = null;

        try (Connection sqlConnection = SQLService.getInstance().getConnection()) {
            statement = sqlConnection.prepareStatement(
                "DELETE FROM " + Constants.DB_TABLE_SCRIPT +
                    " WHERE " + Constants.GENERIC_ID + " = ?"
            );
            statement.setInt(1, id);
            statement.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (statement != null) {
                    statement.close();
                }
            } catch (Exception e) {
            }
        }
    }
}