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diff --git a/support/arara/source/src/main/java/com/github/cereda/arara/controller/SessionController.java b/support/arara/source/src/main/java/com/github/cereda/arara/controller/SessionController.java
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--- a/support/arara/source/src/main/java/com/github/cereda/arara/controller/SessionController.java
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-/**
- * Arara, the cool TeX automation tool
- * Copyright (c) 2012 -- 2019, Paulo Roberto Massa Cereda
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. Neither the name of the project's author nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
- * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-package com.github.cereda.arara.controller;
-
-import java.util.HashMap;
-import java.util.Map;
-
-/**
- * Implements a session controller. This class wraps a map that holds the
- * execution session, that is, a dirty maneuver to exchange pretty much any
- * data between commands and even rules.
- * @author Paulo Roberto Massa Cereda
- * @version 4.0
- * @since 4.0
- */
-public class SessionController {
-
- // the controller itself, since we have a singleton;
- // this is the reference instance, instantiated once
- private static final SessionController instance =
- new SessionController();
-
- // the session map which holds the execution session;
- // the idea here is to provide wrappers to the map
- // methods, so it could be easily manipulated
- private final Map<String, Object> map;
-
- /**
- * Private constructor. Called once when the singleton is created.
- */
- private SessionController() {
- map = new HashMap<String, Object>();
- }
-
- /**
- * Gets the singleton reference. Since this class is implemented as a
- * singleton, you will get the same controller every single time.
- * @return The session controller which holds the session map.
- */
- public static SessionController getInstance() {
- return instance;
- }
-
- /**
- * Gets the object indexed by the provided key. This method actually holds
- * the map method of the very same name.
- * @param key The provided map key.
- * @return The object indexed by the provided map key.
- */
- public Object get(String key) {
- return map.get(key);
- }
-
- /**
- * Puts the object in the session map and indexes it under the provided
- * key. This method actually holds the map method of the very same name.
- * @param key The provided map key.
- * @param value The object to be indexed under the provided key.
- */
- public void put(String key, Object value) {
- map.put(key, value);
- }
-
- /**
- * Checks if the session map contains the provided key. This method holds
- * the map method of the very same name.
- * @param key The key to be checked.
- * @return A boolean value indicating if the session map contains the
- * provided key.
- */
- public boolean contains(String key) {
- return map.containsKey(key);
- }
-
- /**
- * Remove an entry from the map according to the provided key. This method
- * holds the map method of the same name.
- * @param key The provided key to indicate which session map entry should
- * be removed.
- */
- public void remove(String key) {
- map.remove(key);
- }
-
- /**
- * Clears the session map. This method, as usual, holds the map method of
- * the same name.
- */
- public void clear() {
- map.clear();
- }
-
-}