GraphCommandManagerImpl.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.graph.command;

import java.util.logging.Level;
import java.util.logging.Logger;
import javax.enterprise.context.Dependent;
import javax.enterprise.event.Event;
import javax.inject.Inject;

import org.kie.workbench.common.stunner.core.command.Command;
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.event.local.CommandExecutedEvent;
import org.kie.workbench.common.stunner.core.command.event.local.CommandUndoExecutedEvent;
import org.kie.workbench.common.stunner.core.command.event.local.IsCommandAllowedEvent;
import org.kie.workbench.common.stunner.core.command.exception.CommandException;
import org.kie.workbench.common.stunner.core.command.impl.CommandManagerImpl;
import org.kie.workbench.common.stunner.core.rule.RuleViolation;

@Dependent
public class GraphCommandManagerImpl
        implements GraphCommandManager {

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

    private final CommandManager<GraphCommandExecutionContext, RuleViolation> commandManager;
    private final Event<IsCommandAllowedEvent> isCommandAllowedEvent;
    private final Event<CommandExecutedEvent> commandExecutedEvent;
    private final Event<CommandUndoExecutedEvent> commandUndoExecutedEvent;

    protected GraphCommandManagerImpl() {
        this(null,
             null,
             null);
    }

    @Inject
    public GraphCommandManagerImpl(final Event<IsCommandAllowedEvent> isCommandAllowedEvent,
                                   final Event<CommandExecutedEvent> commandExecutedEvent,
                                   final Event<CommandUndoExecutedEvent> commandUndoExecutedEvent) {
        this.commandManager = new CommandManagerImpl<GraphCommandExecutionContext, RuleViolation>();
        this.isCommandAllowedEvent = isCommandAllowedEvent;
        this.commandExecutedEvent = commandExecutedEvent;
        this.commandUndoExecutedEvent = commandUndoExecutedEvent;
    }

    @Override
    public CommandResult<RuleViolation> allow(final GraphCommandExecutionContext context,
                                              final Command<GraphCommandExecutionContext, RuleViolation> command) {
        try {
            final CommandResult<RuleViolation> result = commandManager.allow(context,
                                                                             command);
            if (null != isCommandAllowedEvent) {
                isCommandAllowedEvent.fire(new IsCommandAllowedEvent(command,
                                                                     result));
            }
            return result;
        } catch (CommandException e) {
            LOGGER.log(Level.SEVERE,
                       "Error while executing graph command. Message [" + e.getMessage() + "].");
        }
        return GraphCommandResultBuilder.FAILED;
    }

    @Override
    public CommandResult<RuleViolation> execute(final GraphCommandExecutionContext context,
                                                final Command<GraphCommandExecutionContext, RuleViolation> command) {
        try {
            final CommandResult<RuleViolation> result = commandManager.execute(context,
                                                                               command);
            if (null != commandExecutedEvent) {
                commandExecutedEvent.fire(new CommandExecutedEvent(command,
                                                                   result));
            }
            return result;
        } catch (CommandException e) {
            LOGGER.log(Level.SEVERE,
                       "Error while checking allow for graph command. Message [" + e.getMessage() + "].");
        }
        return GraphCommandResultBuilder.FAILED;
    }

    @Override
    public CommandResult<RuleViolation> undo(final GraphCommandExecutionContext context,
                                             final Command<GraphCommandExecutionContext, RuleViolation> command) {
        final CommandResult<RuleViolation> result = commandManager.undo(context,
                                                                        command);
        if (null != commandUndoExecutedEvent) {
            final CommandUndoExecutedEvent event = new CommandUndoExecutedEvent(command,
                                                                                result);
            commandUndoExecutedEvent.fire(event);
        }
        return result;
    }
}