Revised SystemCommand mechanism and implemented theoretical execution
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package envoy.client.data.commands;
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import java.util.function.Function;
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/**
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* This class is the base class for all {@link SystemCommand}s that do not need
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* another argument to parse their function.
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* <p>
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* Project: <strong>envoy-client</strong><br>
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* File: <strong>NoArgSystemCommand.java</strong><br>
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* Created: <strong>16.07.2020</strong><br>
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*
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* @author Leon Hofmeister
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* @since Envoy Client v0.1-beta
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*/
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public class NoArgSystemCommand extends SystemCommand<Void> {
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/**
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* Constructs a new {@code NoArgSystemCommand} that takes no arguments.
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*
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* @param command the string that must be inputted to execute the given action
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* @param action the action that should be performed
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* @since Envoy Client v0.1-beta
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*/
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public NoArgSystemCommand(String command, Function<Void, Void> action) { super(command, action); }
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}
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package envoy.client.data.commands;
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import java.util.function.Function;
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/**
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* This class is the base class for all {@link SystemCommand}s that need a
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* String to parse their function.
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* <p>
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* Project: <strong>envoy-client</strong><br>
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* File: <strong>StringArgSystemCommand.java</strong><br>
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* Created: <strong>16.07.2020</strong><br>
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*
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* @author Leon Hofmeister
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* @since Envoy Client v0.1-beta
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*/
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public class StringArgSystemCommand extends SystemCommand<String> {
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/**
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* Constructs a new {@code NoArgSystemCommand} that takes a String argument.
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*
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* @param command the string that must be inputted to execute the given action
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* @param action the action that should be performed
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* @since Envoy Client v0.1-beta
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*/
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public StringArgSystemCommand(String command, Function<String, Void> action) { super(command, action); }
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}
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@ -4,48 +4,62 @@ import java.util.function.Function;
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/**
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* This class is the base class of all {@code SystemCommands} and contains an
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* action and a command that needs to be inputted to execute the given action.
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* action and a number of arguments that should be used as input for this
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* function.
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* No {@code SystemCommand} can return anything.
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* Every {@code SystemCommand} must have as argument type {@code String[]} so
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* that the words following the indicator String can be used as input of the
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* function. This approach has one limitation:<br>
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* <b>Order matters!</b> Changing the order of arguments will likely result in
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* unexpected behavior.
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* <p>
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* Project: <strong>envoy-client</strong><br>
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* File: <strong>SystemCommand.java</strong><br>
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* Created: <strong>16.07.2020</strong><br>
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*
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* @author Leon Hofmeister
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* @param <T> the type of argument needed
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* @since Envoy Client v0.1-beta
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*/
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public abstract class SystemCommand<T> {
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public final class SystemCommand {
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/**
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* This variable stores the command that should be inputted to execute the given
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* action
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* This variable stores the amount of arguments that need to be parsed for the
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* underlying function.
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*/
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protected final String command;
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protected final int numberOfArguments;
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protected final Function<T, Void> action;
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/**
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* This Function takes a {@code String[]} as argument because automatically
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* {@code SystemCommand#numberOfArguments} words following the necessary command
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* will be put into this array.
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*
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* @see String#split(String)
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*/
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protected final Function<String[], Void> action;
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/**
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* Constructs a new {@code NoArgSystemCommand} that takes no arguments.
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*
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* @param command the string that must be inputted to execute the given action
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* @param action the action that should be performed
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* @param action the action that should be performed
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* @param numberOfArguments the amount of arguments that need to be parsed for
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* the underlying function
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* @since Envoy Client v0.1-beta
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*/
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public SystemCommand(String command, Function<T, Void> action) {
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this.command = command;
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this.action = action;
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public SystemCommand(Function<String[], Void> action, int numberOfArguments) {
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this.numberOfArguments = numberOfArguments;
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this.action = action;
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}
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/**
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* @return the command that must be inputted to execute the given action
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* @since Envoy Client v0.1-beta
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*/
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public String getCommand() { return command; }
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/**
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* @return the action that should be performed
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* @since Envoy Client v0.1-beta
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*/
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public Function<T, Void> getAction() { return action; }
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public Function<String[], Void> getAction() { return action; }
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/**
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* @return the amount of arguments that need to be parsed for
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* the underlying function
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* @since Envoy Client v0.1-beta
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*/
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public int getNumberOfArguments() { return numberOfArguments; }
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}
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@ -0,0 +1,159 @@
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package envoy.client.data.commands;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Optional;
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import java.util.function.Function;
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import java.util.logging.Level;
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import envoy.util.EnvoyLog;
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/**
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* This class stores all {@link SystemCommand}s used.
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*
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* <p>
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* Project: <strong>envoy-client</strong><br>
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* File: <strong>SystemCommandsMap.java</strong><br>
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* Created: <strong>17.07.2020</strong><br>
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*
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* @author Leon Hofmeister
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* @since Envoy Client v0.1-beta
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* @apiNote Please refrain from using the "/"-char in keys of this map.
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* Unexpected behavior will occur.
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*/
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public class SystemCommandsMap {
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private final HashMap<String, SystemCommand> systemCommands = new HashMap<>();
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private boolean rethrowFailure = true;
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/**
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* @param command the string that must be inputted to execute the
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* given action
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* @param action the action that should be performed
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* @param numberOfArguments the amount of arguments that need to be parsed for
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* the underlying function
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* @since Envoy Client v0.1-beta
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*/
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public void addCommand(String command, Function<String[], Void> action, int numberOfArguments) {
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systemCommands.put(command, new SystemCommand(action, numberOfArguments));
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}
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/**
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* Adds a new {@link SystemCommand} to the map that does not depend upon
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* arguments in the given String
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*
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* @param command the string that must be inputted to execute the given action
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* @param action the action that should be performed. To see why this Function
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* takes a {@code String[]}, see {@link SystemCommand}
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* @since Envoy Client v0.1-beta
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*/
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public void addNoArgCommand(String command, Function<String[], Void> action) { addCommand(command, action, 0); }
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/**
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* @param command the string that must be inputted to execute the
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* given action
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* @param action the action that should be performed. To see why this
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* Function takes a {@code String[]}, see
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* {@link SystemCommand}
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* @param numberOfArguments the amount of arguments that need to be parsed for
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* the underlying function
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* @since Envoy Client v0.1-beta
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*/
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public void add(String command, Function<String[], Void> action, int numberOfArguments) {
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systemCommands.put(command, new SystemCommand(action, numberOfArguments));
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}
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/**
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* This method checks if the input String is a key in the map and returns the
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* wrapped System command if present.
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* Its intended usage is after a "/" has been detected in the input String.
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* It will return an empty optional if the value after the slash is not a key in
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* the map, which is a valid case (i.e. input="3/4" and "4" is not a key in the
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* map).
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* <p>
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* Usage example:<br>
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* {@code SystemCommandsMap systemCommands = new SystemCommandsMap();}<br>
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* {@code systemCommands.add("example", Function.identity, 1);}<br>
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* {@code ....}<br>
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* user input: {@code "/example xyz ..."}<br>
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* {@code systemCommands.checkPresent("example xyz ...")}
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* result: {@code SystemCommand[action=Function.identity, numberOfArguments=1]}
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*
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* @param input the input string given by the user, <b>excluding the "/"</b>
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* @return the wrapped system command, if present
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* @since Envoy Client v0.1-beta
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*/
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public Optional<SystemCommand> checkPresent(String input) {
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// TODO: Is String.indexOf inclusive or exclusive?
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final var firstWord = input.substring(0, input.indexOf(" "));
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return Optional.ofNullable(systemCommands.get(firstWord));
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}
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/**
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* This method checks if the input String is a key in the map and executes the
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* wrapped System command if present.
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* Its intended usage is after a "/" has been detected in the input String.
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* It will do nothing if the value after the slash is not a key in
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* the map, which is a valid case (i.e. input="3/4" and "4" is not a key in the
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* map).
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* <p>
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* Usage example:<br>
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* {@code SystemCommandsMap systemCommands = new SystemCommandsMap();}<br>
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* {@code systemCommands.add("example", (words)-> <Button>.setText(words[0]), 1);}<br>
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* {@code ....}<br>
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* user input: {@code "/example xyz ..."}<br>
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* {@code systemCommands.executeIfPresent("example xyz ...")}
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* result: {@code <Button>.getText()=="xyz"}
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*
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* @param input the input string given by the user, <b>excluding the "/"</b>
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* @since Envoy Client v0.1-beta
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*/
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public void executeIfPresent(String input) {
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checkPresent(input).ifPresent(systemCommand -> {
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// Splitting the String so that the leading command including the first " " is
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// removed and only as many following words as allowed by the system command
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// persist
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// TODO: Is String.indexOf inclusive or exclusive?
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final var remainingString = input.substring(input.indexOf(" ") + 1);
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// TODO: Is Arrays.copyOfRange inclusive or exclusive in the "to" parameter?
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// TODO: Current implementation will fail in certain cases, i.e. two characters
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// behind each other (" "), not enough words, ...
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// TODO: Another way of failure is the fact that in the current implementation,
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// it is assumed that a String is already present in finished form and not that
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// it will be finished later on, or does it?
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final var arguments = Arrays.copyOfRange(remainingString.split(" "), 0, systemCommand.getNumberOfArguments());
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// Executing the function
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try {
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systemCommand.getAction().apply(arguments);
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} catch (final Exception e) {
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EnvoyLog.getLogger(SystemCommandsMap.class).log(Level.WARNING, "The system command " +
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// detected command
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input.substring(0, input.indexOf(" ")) + " threw an exception: ", e);
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if (rethrowFailure) throw e;
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}
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});
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}
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/**
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* @return whether failures of {@link SystemCommand}s should be rethrown
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* @since Envoy Client v0.1-beta
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*/
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public boolean isRethrowFailure() { return rethrowFailure; }
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/**
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* @param rethrowFailure whether failures of {@link SystemCommand}s should be
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* rethrown
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* @return this instance of a {@code SystemCommandsMap}
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* @since Envoy Client v0.1-beta
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*/
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public SystemCommandsMap setRethrowFailure(boolean rethrowFailure) {
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this.rethrowFailure = rethrowFailure;
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return this;
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}
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/**
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* @return the systemCommands
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* @since Envoy Client v0.1-beta
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*/
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public HashMap<String, SystemCommand> getSystemCommands() { return systemCommands; }
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}
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