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package org.boretti.drools.integration.drools4.implementation; |
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import java.lang.reflect.Array; |
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import java.util.ArrayList; |
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import java.util.Iterator; |
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import java.util.List; |
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import org.apache.log4j.Logger; |
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import org.boretti.drools.integration.drools4.DroolsInterface; |
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import org.drools.RuleBase; |
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import org.drools.StatefulSession; |
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import org.drools.StatelessSession; |
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abstract class DroolsInterfaceImplementation<T> implements DroolsInterface{ |
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39 | 19 | private final Logger logger = Logger.getLogger(this.getClass()); |
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private Class<T> clazz; |
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private RuleBase ruleBase; |
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private StatefulSession session; |
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@Override |
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public RuleBase getRuleBase() { |
49 | 13 | return ruleBase; |
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} |
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52 | 19 | protected DroolsInterfaceImplementation(Class<T> clazz,RuleBase ruleBase) { |
53 | 19 | this.clazz=clazz; |
54 | 19 | this.ruleBase=ruleBase; |
55 | 19 | } |
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public Class<T> getClazz() { |
58 | 0 | return clazz; |
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} |
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@Override |
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public StatefulSession getCurrentSession() { |
63 | 18 | return session; |
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} |
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void setCurrentSession(StatefulSession session) { |
67 | 5 | this.session=session; |
68 | 5 | } |
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Iterator<?> runStatelessSession(List<Object> fact) { |
71 | 12 | StatelessSession dss = getRuleBase().newStatelessSession(); |
72 | 12 | new DroolsWorkingMemoryLogger(dss); |
73 | 12 | return dss.executeWithResults(fact).iterateObjects(); |
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} |
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Iterator<?> runStatefulSession(List<Object> fact,boolean requiredExisting) { |
77 | 23 | if (requiredExisting && session==null) { |
78 | 3 | String msg = "No session found when required"; |
79 | 3 | logger.error(msg); |
80 | 3 | throw new IllegalArgumentException(msg); |
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} |
82 | 20 | if (session==null) { |
83 | 5 | session=ruleBase.newStatefulSession(); |
84 | 5 | new DroolsWorkingMemoryLogger(session); |
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} |
86 | 20 | for(Object o:fact) session.insert(o); |
87 | 20 | session.fireAllRules(); |
88 | 20 | return session.iterateObjects(); |
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} |
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Object getResult(Class<?> returnType,Iterator<?> result) { |
92 | 32 | if (returnType.equals(Void.TYPE)) return null; |
93 | 30 | if (result!=null) { |
94 | 30 | if (returnType.isArray()) { |
95 | 2 | Class<?> real = returnType.getComponentType(); |
96 | 2 | List<Object> lst = new ArrayList<Object>(); |
97 | 2 | Iterator<?> i = result; |
98 | 8 | while(i.hasNext()) { |
99 | 6 | Object o = i.next(); |
100 | 6 | if (real.isAssignableFrom(o.getClass())) lst.add(o); |
101 | 6 | } |
102 | 2 | return lst.toArray((Object[])Array.newInstance(real,lst.size())); |
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} else { |
104 | 28 | Iterator<?> i = result; |
105 | 33 | while(i.hasNext()) { |
106 | 29 | Object o = i.next(); |
107 | 29 | if (returnType.isAssignableFrom(o.getClass())) return o; |
108 | 5 | } |
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} |
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} |
111 | 4 | return null; |
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} |
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} |