package com.temenos.interaction.core.workflow;
/*
* #%L
* interaction-core
* %%
* Copyright (C) 2012 - 2013 Temenos Holdings N.V.
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* #L%
*/
import java.util.ArrayList;
import java.util.List;
import com.temenos.interaction.core.command.InteractionCommand;
import com.temenos.interaction.core.command.InteractionContext;
import com.temenos.interaction.core.command.InteractionException;
/**
* This command implements a naive workflow where all commands are executed.
* Commands are added to this workflow and then executed in the same order regardless
* of their return code {@link InteractionCommand.Result.SUCCESS} or otherwise.
* @author aphethean
*/
public class NaiveWorkflowStrategyCommand implements WorkflowCommand {
protected List<InteractionCommand> commands = new ArrayList<InteractionCommand>();
public NaiveWorkflowStrategyCommand() {}
/**
* Construct with a list of commands to execute.
* @param commands
* @invariant commands not null
*/
public NaiveWorkflowStrategyCommand(List<InteractionCommand> commands) {
this.commands = commands;
if (commands == null)
throw new IllegalArgumentException("No commands supplied");
}
public void addCommand(InteractionCommand command) {
if (command == null)
throw new IllegalArgumentException("No command supplied");
commands.add(command);
}
@Override
public boolean isEmpty() {
return commands.isEmpty();
}
/**
* @throws InteractionException
* @precondition at least one command has been added {@link addCommand}
* @postcondition returned {@link Result) will always be the result
* of the last command.
*/
@Override
public Result execute(InteractionContext ctx) throws InteractionException {
assert(commands != null);
assert(commands.size() > 0) : "There must be at least one command in the workflow";
if (ctx == null)
throw new IllegalArgumentException("InteractionContext must be supplied");
Result result = null;
for (InteractionCommand command : commands) {
result = command.execute(ctx);
}
return result;
}
}