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20 package org.apache.directory.server.xdbm.search.impl;
21
22
23 import org.apache.directory.shared.ldap.filter.OrNode;
24 import org.apache.directory.shared.ldap.filter.ExprNode;
25 import org.apache.directory.server.xdbm.IndexEntry;
26 import org.apache.directory.server.xdbm.search.Evaluator;
27 import org.apache.directory.server.core.entry.ServerEntry;
28
29 import java.util.List;
30 import java.util.ArrayList;
31 import java.util.Collections;
32 import java.util.Comparator;
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41 public class OrEvaluator implements Evaluator<OrNode, ServerEntry>
42 {
43 private final List<Evaluator<? extends ExprNode, ServerEntry>> evaluators;
44
45 private final OrNode node;
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47
48 public OrEvaluator( OrNode node, List<Evaluator<? extends ExprNode, ServerEntry>> evaluators )
49 {
50 this.node = node;
51 this.evaluators = optimize( evaluators );
52 }
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66 private List<Evaluator<? extends ExprNode,ServerEntry>>
67 optimize( List<Evaluator<? extends ExprNode, ServerEntry>> unoptimized )
68 {
69 List<Evaluator<? extends ExprNode, ServerEntry>> optimized =
70 new ArrayList<Evaluator<? extends ExprNode, ServerEntry>>( unoptimized.size() );
71 optimized.addAll( unoptimized );
72 Collections.sort( optimized, new Comparator<Evaluator<? extends ExprNode,ServerEntry>>()
73 {
74 public int compare( Evaluator<? extends ExprNode, ServerEntry> e1, Evaluator<? extends ExprNode, ServerEntry> e2 )
75 {
76 long scanCount1 = ( Long ) e1.getExpression().get( "count" );
77 long scanCount2 = ( Long ) e2.getExpression().get( "count" );
78
79 if ( scanCount1 == scanCount2 )
80 {
81 return 0;
82 }
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90 if ( scanCount1 < scanCount2 )
91 {
92 return 1;
93 }
94
95 return -1;
96 }
97 });
98
99 return optimized;
100 }
101
102
103 public boolean evaluate( IndexEntry<?, ServerEntry> indexEntry ) throws Exception
104 {
105 for ( Evaluator<?,ServerEntry> evaluator : evaluators )
106 {
107 if ( evaluator.evaluate( indexEntry ) )
108 {
109 return true;
110 }
111 }
112
113 return false;
114 }
115
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117 public boolean evaluate( Long id ) throws Exception
118 {
119 for ( Evaluator<?,ServerEntry> evaluator : evaluators )
120 {
121 if ( evaluator.evaluate( id ) )
122 {
123 return true;
124 }
125 }
126
127 return false;
128 }
129
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131 public boolean evaluate( ServerEntry entry ) throws Exception
132 {
133 for ( Evaluator<?,ServerEntry> evaluator : evaluators )
134 {
135 if ( evaluator.evaluate( entry ) )
136 {
137 return true;
138 }
139 }
140
141 return false;
142 }
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144
145 public OrNode getExpression()
146 {
147 return node;
148 }
149 }