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1
4 package com.tc.config.schema.dynamic;
5
6 import org.apache.xmlbeans.XmlException;
7 import org.apache.xmlbeans.XmlObject;
8
9 import com.tc.config.schema.context.ConfigContext;
10 import com.tc.util.Assert;
11
12 import java.math.BigInteger  ;
13
14
17 public class IntXPathBasedConfigItem extends XPathBasedConfigItem implements IntConfigItem {
18
19 private static final BigInteger MAX_INT_AS_BIG_INTEGER = new BigInteger (new Integer (Integer.MAX_VALUE).toString());
20 private static final BigInteger MIN_INT_AS_BIG_INTEGER = new BigInteger (new Integer (Integer.MIN_VALUE).toString());
21
22 public IntXPathBasedConfigItem(ConfigContext context, String xpath) {
23 super(context, xpath);
24
25 try {
26 if (!context.hasDefaultFor(xpath) && context.isOptional(xpath)) {
27 throw Assert
29 .failure("XPath '" + xpath + "' is optional and has no default. As such, you can't use it in "
30 + "a ConfigItem returning only an int; what will we return if it's not there? Add a default "
31 + "in the schema, or make it mandatory.");
32 }
33 } catch (XmlException xmle) {
34 throw Assert.failure("Unable to fetch default for '" + xpath + "'.");
35 }
36 }
37
38 protected Object fetchDataFromXmlObject(XmlObject xmlObject) {
39 BigInteger out = (BigInteger ) super.fetchDataFromXmlObjectByReflection(xmlObject, "getBigIntegerValue");
40
41 if (out == null) return null;
42
43 boolean fits = (out.compareTo(MAX_INT_AS_BIG_INTEGER) <= 0) && (out.compareTo(MIN_INT_AS_BIG_INTEGER) >= 0);
44 if (!fits) throw Assert.failure("Value " + out
45 + " is too big to represent as an 'int'; you should either be using a "
46 + "ConfigItem that uses a BigInteger to represent its data, or the schema should "
47 + "restrict this value to one that fits in a Java 'int'.");
48 return new Integer (out.intValue());
49 }
50
51 public int getInt() {
52 return ((Integer ) getObject()).intValue();
53 }
54
55 }
56 |
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