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21 package org.apache.hadoop.hbase.filter;
22
23 import java.io.DataInput;
24 import java.io.DataOutput;
25 import java.io.IOException;
26 import java.util.ArrayList;
27
28 import org.apache.hadoop.hbase.util.Bytes;
29
30 import com.google.common.base.Preconditions;
31
32
33
34
35 public class PrefixFilter extends FilterBase {
36 protected byte [] prefix = null;
37 protected boolean passedPrefix = false;
38 protected boolean filterRow = true;
39
40 public PrefixFilter(final byte [] prefix) {
41 this.prefix = prefix;
42 }
43
44 public PrefixFilter() {
45 super();
46 }
47
48 public byte[] getPrefix() {
49 return prefix;
50 }
51
52 public boolean filterRowKey(byte[] buffer, int offset, int length) {
53 if (buffer == null || this.prefix == null)
54 return true;
55 if (length < prefix.length)
56 return true;
57
58
59
60 int cmp = Bytes.compareTo(buffer, offset, this.prefix.length, this.prefix, 0,
61 this.prefix.length);
62 if(cmp > 0) {
63 passedPrefix = true;
64 }
65 filterRow = (cmp != 0);
66 return filterRow;
67 }
68
69 public boolean filterRow() {
70 return filterRow;
71 }
72
73 public void reset() {
74 filterRow = true;
75 }
76
77 public boolean filterAllRemaining() {
78 return passedPrefix;
79 }
80
81 public static Filter createFilterFromArguments(ArrayList<byte []> filterArguments) {
82 Preconditions.checkArgument(filterArguments.size() == 1,
83 "Expected 1 but got: %s", filterArguments.size());
84 byte [] prefix = ParseFilter.removeQuotesFromByteArray(filterArguments.get(0));
85 return new PrefixFilter(prefix);
86 }
87
88 public void write(DataOutput out) throws IOException {
89 Bytes.writeByteArray(out, this.prefix);
90 }
91
92 public void readFields(DataInput in) throws IOException {
93 this.prefix = Bytes.readByteArray(in);
94 }
95
96 @Override
97 public String toString() {
98 return this.getClass().getSimpleName() + " " + Bytes.toStringBinary(this.prefix);
99 }
100 }