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21 package org.apache.hadoop.hbase.hbql.statement;
22
23 import org.apache.expreval.expr.var.NamedParameter;
24 import org.apache.hadoop.hbase.hbql.client.HBqlException;
25 import org.apache.hadoop.hbase.hbql.util.AtomicReferences;
26 import org.apache.hadoop.hbase.hbql.util.Lists;
27
28 import java.io.Serializable;
29 import java.util.Collection;
30 import java.util.List;
31 import java.util.SortedSet;
32 import java.util.TreeSet;
33 import java.util.concurrent.atomic.AtomicReference;
34
35 public class NamedParameters implements Serializable {
36
37 private static final long serialVersionUID = 1L;
38
39 private final SortedSet<NamedParameter> paramSet = new TreeSet<NamedParameter>(NamedParameter.getComparator());
40 private final AtomicReference<List<NamedParameter>> atomicParamList = AtomicReferences.newAtomicReference();
41
42 private SortedSet<NamedParameter> getParamSet() {
43 return this.paramSet;
44 }
45
46 public void addParameters(final Collection<NamedParameter> params) {
47 if (params != null)
48 this.getParamSet().addAll(params);
49 }
50
51 public AtomicReference<List<NamedParameter>> getAtomicParamList() {
52 return atomicParamList;
53 }
54
55 public List<NamedParameter> getParameterList() {
56 if (this.getAtomicParamList().get() == null) {
57 synchronized (this) {
58 if (this.getAtomicParamList().get() == null) {
59
60
61 final int size = this.getParamSet().size();
62 final List<NamedParameter> val = Lists.newArrayList(this.getParamSet().toArray(new NamedParameter[size]));
63 this.getAtomicParamList().set(val);
64 }
65 }
66 }
67 return this.getAtomicParamList().get();
68 }
69
70 public NamedParameter getParameter(final int i) throws HBqlException {
71 try {
72 return this.getParameterList().get(i - 1);
73 }
74 catch (Exception e) {
75 throw new HBqlException("Invalid index: " + (i - 1));
76 }
77 }
78
79 public void clearParameters() {
80 for (final NamedParameter param : this.getParameterList())
81 param.reset();
82 }
83 }