CommandManagerImpl.java

/*
 * Copyright 2017 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.kie.workbench.common.stunner.core.command.impl;

import java.util.logging.Level;
import java.util.logging.Logger;

import org.kie.workbench.common.stunner.core.command.Command;
import org.kie.workbench.common.stunner.core.command.CommandListener;
import org.kie.workbench.common.stunner.core.command.CommandManager;
import org.kie.workbench.common.stunner.core.command.CommandResult;
import org.kie.workbench.common.stunner.core.command.HasCommandListener;
import org.uberfire.commons.validation.PortablePreconditions;

public class CommandManagerImpl<C, V> implements CommandManager<C, V>,
                                                 HasCommandListener<CommandListener<C, V>> {

    private static Logger LOGGER = Logger.getLogger(CommandManagerImpl.class.getName());

    private CommandListener<C, V> listener;

    public CommandManagerImpl() {
        this.listener = null;
    }

    @Override
    public CommandResult<V> allow(final C context,
                                  final Command<C, V> command) {
        PortablePreconditions.checkNotNull("command",
                                           command);
        LOGGER.log(Level.FINE,
                   "Evaluating (allow) command [" + command + "]...");
        final CommandResult<V> result = command.allow(context);
        if (null != listener) {
            listener.onAllow(context,
                             command,
                             result);
        }
        LOGGER.log(Level.FINE,
                   "Evaluation (allow) of command [" + command + "] finished - Result [" + result + "]");
        return result;
    }

    @Override
    public CommandResult<V> execute(final C context,
                                    final Command<C, V> command) {
        PortablePreconditions.checkNotNull("command",
                                           command);
        LOGGER.log(Level.FINE,
                   "Executing command [" + command + "]...");
        final CommandResult<V> result = command.execute(context);
        if (null != listener) {
            listener.onExecute(context,
                               command,
                               result);
        }
        LOGGER.log(Level.FINE,
                   "Execution of command [" + command + "] finished - Result [" + result + "]");
        return result;
    }

    @Override
    public CommandResult<V> undo(final C context,
                                 final Command<C, V> command) {
        LOGGER.log(Level.FINE,
                   "Undoing command [" + command + "]...");
        final CommandResult<V> result = command.undo(context);
        if (null != listener) {
            listener.onUndo(context,
                            command,
                            result);
        }
        LOGGER.log(Level.FINE,
                   "Undo of command [" + command + "] finished - Result [" + result + "]");
        return result;
    }

    @Override
    public void setCommandListener(final CommandListener<C, V> listener) {
        this.listener = listener;
    }
}