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1 package JSci.chemistry;
2
3 import java.io.IOException  ;
4 import java.lang.Double ;
5 import java.util.Collections ;
6 import java.util.Map ;
7 import java.util.HashMap ;
8 import javax.xml.parsers.*;
9 import org.w3c.dom.*;
10 import org.xml.sax.SAXException ;
11 import JSci.chemistry.periodictable.*;
12
13
18 public final class PeriodicTable {
19 private static final Map table = new HashMap ();
20 private static Map symbols;
21
22 private PeriodicTable() {}
23
26 public static String getName(String symbol) {
27 if(symbols == null)
28 symbols = loadIndex();
29 return (String )symbols.get(symbol);
30 }
31
34 public static Element getElement(String name) {
35 name = name.toLowerCase();
36 Element element = (Element) table.get(name);
37 if(element == null) {
38 element = loadElement("periodictable/"+name+".xml");
39 if(element != null)
40 table.put(name, element);
41 }
42 return element;
43 }
44
47 private static Map loadIndex() {
48 DocumentBuilderFactory docFactory=DocumentBuilderFactory.newInstance();
49 try {
50 DocumentBuilder docBuilder=docFactory.newDocumentBuilder();
51 Document doc=docBuilder.parse(PeriodicTable.class.getResource("periodictable/index.xml").toString());
52 Node root=doc.getDocumentElement();
53 NodeList nl=root.getChildNodes();
54 Map index = new HashMap ();
55 for(int i=0; i<nl.getLength(); i++) {
56 Node node = nl.item(i);
57 if(node.getNodeName().equals("element")) {
58 NamedNodeMap attr = node.getAttributes();
59 index.put(attr.getNamedItem("symbol").getNodeValue(), attr.getNamedItem("name").getNodeValue());
60 }
61 }
62 return index;
63 } catch(ParserConfigurationException e) {
64 return Collections.EMPTY_MAP;
65 } catch(IOException e) {
66 return Collections.EMPTY_MAP;
67 } catch(SAXException e) {
68 return Collections.EMPTY_MAP;
69 }
70 }
71
74 private static Element loadElement(String resname) {
75 DocumentBuilderFactory docFactory=DocumentBuilderFactory.newInstance();
76 try {
77 DocumentBuilder docBuilder=docFactory.newDocumentBuilder();
78 Document doc=docBuilder.parse(PeriodicTable.class.getResource(resname).toString());
79 Node root=doc.getDocumentElement();
80 String group=root.getAttributes().getNamedItem("series").getNodeValue();
81 NodeList nl=root.getChildNodes();
82 String name=findStringValue(nl,"name");
83 String symbol=findStringValue(nl,"symbol");
84 Element elem;
85 if(group.equals("non-metal"))
86 elem=new NonMetal(name,symbol);
87 else if(group.equals("halogen"))
88 elem=new Halogen(name,symbol);
89 else if(group.equals("noble-gas"))
90 elem=new NobleGas(name,symbol);
91 else if(group.equals("metal"))
92 elem=new Metal(name,symbol);
93 else if(group.equals("alkali-metal"))
94 elem=new AlkaliMetal(name,symbol);
95 else if(group.equals("alkali-earth-metal"))
96 elem=new AlkaliEarthMetal(name,symbol);
97 else if(group.equals("rare-earth-metal"))
98 elem=new RareEarthMetal(name,symbol);
99 else if(group.equals("transition-metal"))
100 elem=new TransitionMetal(name,symbol);
101 else
102 elem=new Element(name,symbol);
103 elem.setAtomicNumber(Integer.parseInt(findStringValue(nl,"atomic-number")));
104 elem.setMassNumber(Integer.parseInt(findStringValue(nl,"mass-number")));
105 elem.setElectronegativity(findDoubleValue(nl,"electronegativity"));
106 elem.setCovalentRadius(findDoubleValue(nl,"covalent-radius"));
107 elem.setAtomicRadius(findDoubleValue(nl,"atomic-radius"));
108 elem.setMeltingPoint(findDoubleValue(nl,"melting-point"));
109 elem.setBoilingPoint(findDoubleValue(nl,"boiling-point"));
110 elem.setDensity(findDoubleValue(nl,"density"));
111 elem.setSpecificHeat(findDoubleValue(nl,"specific-heat"));
112 elem.setElectricalConductivity(findDoubleValue(nl,"electrical-conductivity"));
113 elem.setThermalConductivity(findDoubleValue(nl,"thermal-conductivity"));
114 return elem;
115 } catch(ParserConfigurationException e) {
116 return null;
117 } catch(IOException e) {
118 return null;
119 } catch(SAXException e) {
120 return null;
121 }
122 }
123 private static String findStringValue(NodeList nl,String name) {
124 Node item;
125 for(int i=0;i<nl.getLength();i++) {
126 item=nl.item(i);
127 if(item.getNodeName().equals(name))
128 return item.getFirstChild().getNodeValue();
129 }
130 return "";
131 }
132 private static double findDoubleValue(NodeList nl,String name) {
133 Node item;
134 for(int i=0;i<nl.getLength();i++) {
135 item=nl.item(i);
136 if(item.getNodeName().equals(name))
137 return Double.parseDouble(item.getFirstChild().getNodeValue());
138 }
139 return Double.NaN;
140 }
141 }
142
143 |
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