| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| * |
| */ |
| |
| /* $Id$ */ |
| |
| package org.apache.lenya.workflow.impl; |
| |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.lenya.workflow.Transition; |
| import org.apache.lenya.workflow.Workflow; |
| import org.apache.lenya.workflow.WorkflowException; |
| |
| /** |
| * Implementation of a workflow schema. |
| */ |
| public class WorkflowImpl implements Workflow { |
| |
| /** |
| * Creates a new instance of WorkflowImpl. |
| * @param _name The name. |
| * @param _initialState the initial state of the workflow. |
| */ |
| protected WorkflowImpl(String _name, String _initialState) { |
| this.initialState = _initialState; |
| this.name = _name; |
| addState(_initialState); |
| } |
| |
| private String initialState; |
| private String name; |
| |
| /** |
| * Returns the initial state of this workflow. |
| * @return The initial state. |
| * |
| */ |
| public String getInitialState() { |
| return this.initialState; |
| } |
| |
| private Set transitions = new HashSet(); |
| private Set states = new HashSet(); |
| |
| /** |
| * Adds a state. |
| * @param state A state. |
| */ |
| private void addState(String state) { |
| this.states.add(state); |
| } |
| |
| /** |
| * Adds a transition. |
| * @param transition The transition. |
| */ |
| protected void addTransition(TransitionImpl transition) { |
| this.transitions.add(transition); |
| addState(transition.getSource()); |
| addState(transition.getDestination()); |
| } |
| |
| /** |
| * Returns the transitions. |
| * @return An array of transitions. |
| */ |
| protected TransitionImpl[] getTransitions() { |
| return (TransitionImpl[]) this.transitions.toArray(new TransitionImpl[this.transitions.size()]); |
| } |
| |
| /** |
| * @see org.apache.lenya.workflow.Workflow#getLeavingTransitions(java.lang.String) |
| */ |
| public Transition[] getLeavingTransitions(String state) throws WorkflowException { |
| Set leavingTransitions = new HashSet(); |
| TransitionImpl[] _transitions = getTransitions(); |
| for (int i = 0; i < _transitions.length; i++) { |
| if (_transitions[i].getSource().equals(state)) { |
| leavingTransitions.add(_transitions[i]); |
| } |
| } |
| |
| return (Transition[]) leavingTransitions.toArray(new Transition[leavingTransitions.size()]); |
| } |
| |
| /** |
| * Checks if this workflow contains a state. |
| * @param state The state to check. |
| * @return <code>true</code> if the state is contained, <code>false</code> |
| * otherwise. |
| */ |
| protected boolean containsState(String state) { |
| return this.states.contains(state); |
| } |
| |
| public String[] getStates() { |
| return (String[]) this.states.toArray(new String[this.states.size()]); |
| } |
| |
| private Set events = new HashSet(); |
| |
| /** |
| * Adds an event. |
| * @param event An event. |
| */ |
| protected void addEvent(String event) { |
| this.events.add(event); |
| } |
| |
| private Map variables = new HashMap(); |
| |
| /** |
| * Adds a variable. |
| * @param variable A variable. |
| */ |
| protected void addVariable(BooleanVariableImpl variable) { |
| this.variables.put(variable.getName(), variable); |
| } |
| |
| /** |
| * Returns the variable for a certain name. |
| * @param _name The name of the variable. |
| * @return A variable. |
| * @throws WorkflowException if no variable with the given name exists. |
| */ |
| public BooleanVariableImpl getVariable(String _name) throws WorkflowException { |
| if (!this.variables.containsKey(_name)) { |
| throw new WorkflowException("Workflow does not contain the variable '" + _name + "'!"); |
| } |
| |
| return (BooleanVariableImpl) this.variables.get(_name); |
| } |
| |
| /** |
| * Returns the variables. |
| * @return An array of variables. |
| */ |
| protected BooleanVariableImpl[] getVariables() { |
| return (BooleanVariableImpl[]) this.variables.values().toArray(new BooleanVariableImpl[this.variables |
| .size()]); |
| } |
| |
| /** |
| * @see org.apache.lenya.workflow.Workflow#getVariableNames() |
| */ |
| public String[] getVariableNames() { |
| BooleanVariableImpl[] _variables = getVariables(); |
| String[] names = new String[_variables.length]; |
| for (int i = 0; i < names.length; i++) { |
| names[i] = _variables[i].getName(); |
| } |
| return names; |
| } |
| |
| /** |
| * @see org.apache.lenya.workflow.Workflow#getName() |
| */ |
| public String getName() { |
| return this.name; |
| } |
| |
| /** |
| * @see org.apache.lenya.workflow.Workflow#getInitialValue(java.lang.String) |
| */ |
| public boolean getInitialValue(String variableName) throws WorkflowException { |
| BooleanVariableImpl[] variables = getVariables(); |
| for (int i = 0; i < variables.length; i++) { |
| if (variables[i].getName().equals(variableName)) { |
| return variables[i].getInitialValue(); |
| } |
| } |
| throw new WorkflowException("The variable [" + variableName + "] does not exist."); |
| } |
| |
| /** |
| * @see org.apache.lenya.workflow.Workflow#getEvents() |
| */ |
| public String[] getEvents() { |
| return (String[]) this.events.toArray(new String[this.events.size()]); |
| } |
| } |