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1
8
9 package org.picocontainer.gems.constraints;
10
11 import org.picocontainer.ComponentAdapter;
12 import org.picocontainer.PicoContainer;
13 import org.picocontainer.PicoIntrospectionException;
14 import org.picocontainer.defaults.AmbiguousComponentResolutionException;
15 import org.picocontainer.defaults.CollectionComponentParameter;
16
17 import java.lang.reflect.Array  ;
18 import java.util.Map ;
19
20
26 public abstract class AbstractConstraint extends CollectionComponentParameter implements Constraint {
27
28
31 protected AbstractConstraint() {
32 super(false);
33 }
34
35 public Object resolveInstance(PicoContainer container, ComponentAdapter adapter, Class expectedType) throws PicoIntrospectionException {
36 final Object [] array = (Object []) super.resolveInstance(container, adapter, getArrayType(expectedType));
37 if (array.length == 1) {
38 return array[0];
39 }
40 return null;
41 }
42
43 public boolean isResolvable(PicoContainer container, ComponentAdapter adapter, Class expectedType) throws PicoIntrospectionException {
44 return super.isResolvable(container, adapter, getArrayType(expectedType));
45 }
46
47 public void verify(PicoContainer container, ComponentAdapter adapter, Class expectedType) throws PicoIntrospectionException {
48 super.verify(container, adapter, getArrayType(expectedType));
49 }
50
51 public abstract boolean evaluate(ComponentAdapter adapter);
52
53 protected Map getMatchingComponentAdapters(PicoContainer container, ComponentAdapter adapter, Class keyType, Class valueType) {
54 final Map map = super.getMatchingComponentAdapters(container, adapter, keyType, valueType);
55 if (map.size() > 1) {
56 throw new AmbiguousComponentResolutionException(valueType, map.keySet().toArray(new Object [map.size()]));
57 }
58 return map;
59 }
60
61 private Class getArrayType(Class expectedType) {
62 return Array.newInstance(expectedType, 0).getClass();
63 }
64 }
65 |
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