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annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/transitions/ValueCompareTransition.java @ 356:22e9574c8b1b

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Added a new Transition to compare values. flys-artifacts/trunk@1763 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 28 Apr 2011 11:22:45 +0000
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children eb5564662e19
rev   line source
356
22e9574c8b1b Added a new Transition to compare values.
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1 package de.intevation.flys.artifacts.transitions;
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2
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3 import javax.xml.xpath.XPathConstants;
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4
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5 import org.apache.log4j.Logger;
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6
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7 import org.w3c.dom.Node;
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8
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9 import de.intevation.artifacts.Artifact;
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10
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11 import de.intevation.artifactdatabase.data.StateData;
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12 import de.intevation.artifactdatabase.state.State;
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13
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14 import de.intevation.artifacts.common.utils.XMLUtils;
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15
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16 import de.intevation.flys.artifacts.FLYSArtifact;
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17
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18
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19 /**
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20 * This transition compares data objects with a <i>equal</i> or <i>notequal</i>
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21 * operator.
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22 *
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23 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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24 */
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25 public class ValueCompareTransition extends DefaultTransition {
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26
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27 /** The logger that is used in this transition.*/
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28 private static Logger log = Logger.getLogger(ValueCompareTransition.class);
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29
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30
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31 /** XPath that points to the condition's operator.*/
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32 public static final String XPATH_OPERATOR = "condition/@operator";
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33
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34 /** XPath that points to the condition's value.*/
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35 public static final String XPATH_VALUE = "condition/@value";
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36
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37 /** XPath that points to the condition's dataname.*/
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38 public static final String XPATH_DATANAME = "condition/@data";
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39
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40 /** The value of the 'equal' operator.*/
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41 public static final String OPERATOR_EQUAL = "equal";
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42
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43 /** The value of the 'not equal' operator.*/
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44 public static final String OPERATOR_NOTEQUAL = "notequal";
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45
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46
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47 /** The operator.*/
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48 protected String operator;
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49
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50 /** The value used for comparison.*/
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51 protected String value;
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52
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53 /** The name of the data used for the comparison.*/
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54 protected String dataname;
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55
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56
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57
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58 public ValueCompareTransition() {
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59 }
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60
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61
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62 public ValueCompareTransition(String from, String to) {
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63 super(from, to);
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64 }
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65
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66
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67 @Override
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68 public void init(Node config) {
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69 log.debug("ValueCompareTransition.init");
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70
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71 String tmp = (String) XMLUtils.xpath(
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72 config,
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73 XPATH_OPERATOR,
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74 XPathConstants.STRING);
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75 operator = tmp.trim().toLowerCase();
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76
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77 value = (String) XMLUtils.xpath(
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78 config,
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79 XPATH_VALUE,
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80 XPathConstants.STRING);
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81
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82 dataname = (String) XMLUtils.xpath(
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83 config,
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84 XPATH_DATANAME,
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85 XPathConstants.STRING);
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86 }
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87
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88
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89 @Override
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90 public boolean isValid(Artifact artifact, State a, State b) {
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91 log.debug("ValueCompareTransition.isValid");
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92
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93 FLYSArtifact flysArtifact = (FLYSArtifact) artifact;
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94
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95 StateData dataObj = flysArtifact.getData(dataname);
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96 String dataVal = dataObj != null ? (String) dataObj.getValue() : "";
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97
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98 if (log.isDebugEnabled()) {
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99 log.debug("Compare settings:");
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100 log.debug("-- dataname: " + dataname);
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101 log.debug("-- operator: " + operator);
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102 log.debug("-- compare value: " + value);
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103 log.debug("-- state value: " + dataVal);
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104 }
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105
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106 if (operator.equals(OPERATOR_EQUAL)) {
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107 return value.equals(dataVal);
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108 }
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109 else if (operator.equals(OPERATOR_NOTEQUAL)) {
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110 return !(value.equals(dataVal));
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111 }
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112
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113 log.error("Wrong operator set! No comparison takes place.");
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114
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115 return false;
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116 }
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117 }
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118 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org