1 /*
2 * Copyright 2008 FatWire Corporation. All Rights Reserved.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package tools.gsf.facade.runtag.vdm;
18
19 import COM.FutureTense.Interfaces.ICS;
20 import tools.gsf.facade.runtag.TagRunner;
21
22 /**
23 * Sets a scalar attribute value without resetting it if it has already been set
24 * to the same value.
25 *
26 * @author Tony Field
27 * @since Sep 29, 2008
28 */
29 public class SetScalarWithoutReset implements TagRunner {
30
31 private final String attribute;
32
33 private final String value;
34
35 public SetScalarWithoutReset(final String attribute, final String value) {
36 super();
37 this.attribute = attribute;
38 this.value = value;
39 }
40
41 public String execute(final ICS ics) {
42 final String varname = "get_scalar_output_value" + ics.genID(true);
43 try {
44 ics.RemoveVar(varname);
45 GetScalar getScalar = new GetScalar(attribute, varname);
46 String getResult = getScalar.execute(ics);
47 String attrVal = ics.GetVar(varname);
48 if (attrVal != null && attrVal.equals(value) || attrVal == null && value == null) {
49 // nothing to do. this saves a lot of processing
50 return getResult;
51 }
52
53 SetScalar setScalar = new SetScalar(attribute, value);
54 return setScalar.execute(ics);
55 } finally {
56 // cleaning up
57 ics.RemoveVar(varname);
58 }
59 }
60
61 public String getValue() {
62 return value;
63 }
64
65 public String getAttribute() {
66 return attribute;
67 }
68 }