01: package org.drools.ruleflow.core.impl;
02:
03: /*
04: * Copyright 2005 JBoss Inc
05: *
06: * Licensed under the Apache License, Version 2.0 (the "License");
07: * you may not use this file except in compliance with the License.
08: * You may obtain a copy of the License at
09: *
10: * http://www.apache.org/licenses/LICENSE-2.0
11: *
12: * Unless required by applicable law or agreed to in writing, software
13: * distributed under the License is distributed on an "AS IS" BASIS,
14: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15: * See the License for the specific language governing permissions and
16: * limitations under the License.
17: */
18:
19: import org.drools.ruleflow.core.Connection;
20: import org.drools.ruleflow.core.Join;
21:
22: /**
23: * Default implementation of a join.
24: *
25: * @author <a href="mailto:kris_verlaenen@hotmail.com">Kris Verlaenen</a>
26: */
27: public class JoinImpl extends NodeImpl implements Join {
28:
29: private static final long serialVersionUID = 400L;
30:
31: private int type;
32:
33: public JoinImpl() {
34: this .type = TYPE_UNDEFINED;
35: }
36:
37: public void setType(final int type) {
38: this .type = type;
39: }
40:
41: public int getType() {
42: return this .type;
43: }
44:
45: public Connection getTo() {
46: if (getOutgoingConnections().size() > 0) {
47: return (Connection) getOutgoingConnections().get(0);
48: }
49: return null;
50: }
51:
52: protected void validateAddOutgoingConnection(
53: final Connection connection) {
54: super .validateAddOutgoingConnection(connection);
55: if (connection.getType() != Connection.TYPE_NORMAL) {
56: throw new IllegalArgumentException(
57: "Unknown connection type :"
58: + connection.getType()
59: + ", only NORMAL is allowed as outgoing connection.");
60: }
61: if (getOutgoingConnections().size() > 0) {
62: throw new IllegalArgumentException(
63: "A join cannot have more than one outgoing connection");
64: }
65: }
66:
67: }
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