/**
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hbase.filter;
import java.nio.charset.Charset;
import java.nio.charset.IllegalCharsetNameException;
import java.util.Arrays;
import java.util.regex.Pattern;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.hbase.exceptions.DeserializationException;
import org.apache.hadoop.hbase.protobuf.generated.ComparatorProtos;
import org.apache.hadoop.hbase.util.Bytes;
import org.jcodings.Encoding;
import org.jcodings.EncodingDB;
import org.jcodings.specific.UTF8Encoding;
import org.joni.Matcher;
import org.joni.Option;
import org.joni.Regex;
import org.joni.Syntax;
import com.google.protobuf.InvalidProtocolBufferException;
/**
* This comparator is for use with {@link CompareFilter} implementations, such
* as {@link RowFilter}, {@link QualifierFilter}, and {@link ValueFilter}, for
* filtering based on the value of a given column. Use it to test if a given
* regular expression matches a cell value in the column.
* <p>
* Only EQUAL or NOT_EQUAL comparisons are valid with this comparator.
* <p>
* For example:
* <p>
* <pre>
* ValueFilter vf = new ValueFilter(CompareOp.EQUAL,
* new RegexStringComparator(
* // v4 IP address
* "(((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3,3}" +
* "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))(\\/[0-9]+)?" +
* "|" +
* // v6 IP address
* "((([\\dA-Fa-f]{1,4}:){7}[\\dA-Fa-f]{1,4})(:([\\d]{1,3}.)" +
* "{3}[\\d]{1,3})?)(\\/[0-9]+)?"));
* </pre>
* <p>
* Supports {@link java.util.regex.Pattern} flags as well:
* <p>
* <pre>
* ValueFilter vf = new ValueFilter(CompareOp.EQUAL,
* new RegexStringComparator("regex", Pattern.CASE_INSENSITIVE | Pattern.DOTALL));
* </pre>
* @see java.util.regex.Pattern
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public class RegexStringComparator extends ByteArrayComparable {
private static final Log LOG = LogFactory.getLog(RegexStringComparator.class);
private Engine engine;
/** Engine implementation type (default=JAVA) */
public enum EngineType {
JAVA,
JONI
}
/**
* Constructor
* Adds Pattern.DOTALL to the underlying Pattern
* @param expr a valid regular expression
*/
public RegexStringComparator(String expr) {
this(expr, Pattern.DOTALL);
}
/**
* Constructor
* Adds Pattern.DOTALL to the underlying Pattern
* @param expr a valid regular expression
* @param engine engine implementation type
*/
public RegexStringComparator(String expr, EngineType engine) {
this(expr, Pattern.DOTALL, engine);
}
/**
* Constructor
* @param expr a valid regular expression
* @param flags java.util.regex.Pattern flags
*/
public RegexStringComparator(String expr, int flags) {
this(expr, flags, EngineType.JAVA);
}
/**
* Constructor
* @param expr a valid regular expression
* @param flags java.util.regex.Pattern flags
* @param engine engine implementation type
*/
public RegexStringComparator(String expr, int flags, EngineType engine) {
super(Bytes.toBytes(expr));
switch (engine) {
case JAVA:
this.engine = new JavaRegexEngine(expr, flags);
break;
case JONI:
this.engine = new JoniRegexEngine(expr, flags);
break;
}
}
/**
* Specifies the {@link Charset} to use to convert the row key to a String.
* <p>
* The row key needs to be converted to a String in order to be matched
* against the regular expression. This method controls which charset is
* used to do this conversion.
* <p>
* If the row key is made of arbitrary bytes, the charset {@code ISO-8859-1}
* is recommended.
* @param charset The charset to use.
*/
public void setCharset(final Charset charset) {
engine.setCharset(charset.name());
}
@Override
public int compareTo(byte[] value, int offset, int length) {
return engine.compareTo(value, offset, length);
}
/**
* @return The comparator serialized using pb
*/
public byte [] toByteArray() {
return engine.toByteArray();
}
/**
* @param pbBytes A pb serialized {@link RegexStringComparator} instance
* @return An instance of {@link RegexStringComparator} made from <code>bytes</code>
* @throws DeserializationException
* @see #toByteArray
*/
public static RegexStringComparator parseFrom(final byte [] pbBytes)
throws DeserializationException {
ComparatorProtos.RegexStringComparator proto;
try {
proto = ComparatorProtos.RegexStringComparator.parseFrom(pbBytes);
} catch (InvalidProtocolBufferException e) {
throw new DeserializationException(e);
}
RegexStringComparator comparator;
if (proto.hasEngine()) {
EngineType engine = EngineType.valueOf(proto.getEngine());
comparator = new RegexStringComparator(proto.getPattern(), proto.getPatternFlags(),
engine);
} else {
comparator = new RegexStringComparator(proto.getPattern(), proto.getPatternFlags());
}
String charset = proto.getCharset();
if (charset.length() > 0) {
try {
comparator.getEngine().setCharset(charset);
} catch (IllegalCharsetNameException e) {
LOG.error("invalid charset", e);
}
}
return comparator;
}
/**
* @param other
* @return true if and only if the fields of the comparator that are serialized
* are equal to the corresponding fields in other. Used for testing.
*/
boolean areSerializedFieldsEqual(ByteArrayComparable other) {
if (other == this) return true;
if (!(other instanceof RegexStringComparator)) return false;
RegexStringComparator comparator = (RegexStringComparator)other;
return super.areSerializedFieldsEqual(comparator)
&& engine.getClass().isInstance(comparator.getEngine())
&& engine.getPattern().equals(comparator.getEngine().getPattern())
&& engine.getFlags() == comparator.getEngine().getFlags()
&& engine.getCharset().equals(comparator.getEngine().getCharset());
}
Engine getEngine() {
return engine;
}
/**
* This is an internal interface for abstracting access to different regular
* expression matching engines.
*/
static interface Engine {
/**
* Returns the string representation of the configured regular expression
* for matching
*/
String getPattern();
/**
* Returns the set of configured match flags, a bit mask that may include
* {@link Pattern} flags
*/
int getFlags();
/**
* Returns the name of the configured charset
*/
String getCharset();
/**
* Set the charset used when matching
* @param charset the name of the desired charset for matching
*/
void setCharset(final String charset);
/**
* Return the serialized form of the configured matcher
*/
byte [] toByteArray();
/**
* Match the given input against the configured pattern
* @param value the data to be matched
* @param offset offset of the data to be matched
* @param length length of the data to be matched
* @return 0 if a match was made, 1 otherwise
*/
int compareTo(byte[] value, int offset, int length);
}
/**
* Implementation of the Engine interface using Java's Pattern.
* <p>
* This is the default engine.
*/
static class JavaRegexEngine implements Engine {
private Charset charset = Charset.forName("UTF-8");
private Pattern pattern;
public JavaRegexEngine(String regex, int flags) {
this.pattern = Pattern.compile(regex, flags);
}
@Override
public String getPattern() {
return pattern.toString();
}
@Override
public int getFlags() {
return pattern.flags();
}
@Override
public String getCharset() {
return charset.name();
}
@Override
public void setCharset(String charset) {
this.charset = Charset.forName(charset);
}
@Override
public int compareTo(byte[] value, int offset, int length) {
// Use find() for subsequence match instead of matches() (full sequence
// match) to adhere to the principle of least surprise.
String tmp;
if (length < value.length / 2) {
// See HBASE-9428. Make a copy of the relevant part of the byte[],
// or the JDK will copy the entire byte[] during String decode
tmp = new String(Arrays.copyOfRange(value, offset, offset + length), charset);
} else {
tmp = new String(value, offset, length, charset);
}
return pattern.matcher(tmp).find() ? 0 : 1;
}
@Override
public byte[] toByteArray() {
ComparatorProtos.RegexStringComparator.Builder builder =
ComparatorProtos.RegexStringComparator.newBuilder();
builder.setPattern(pattern.pattern());
builder.setPatternFlags(pattern.flags());
builder.setCharset(charset.name());
builder.setEngine(EngineType.JAVA.name());
return builder.build().toByteArray();
}
}
/**
* Implementation of the Engine interface using Jruby's joni regex engine.
* <p>
* This engine operates on byte arrays directly so is expected to be more GC
* friendly, and reportedly is twice as fast as Java's Pattern engine.
* <p>
* NOTE: Only the {@link Pattern} flags CASE_INSENSITIVE, DOTALL, and
* MULTILINE are supported.
*/
static class JoniRegexEngine implements Engine {
private Encoding encoding = UTF8Encoding.INSTANCE;
private String regex;
private Regex pattern;
public JoniRegexEngine(String regex, int flags) {
this.regex = regex;
byte[] b = Bytes.toBytes(regex);
this.pattern = new Regex(b, 0, b.length, patternToJoniFlags(flags), encoding, Syntax.Java);
}
@Override
public String getPattern() {
return regex;
}
@Override
public int getFlags() {
return pattern.getOptions();
}
@Override
public String getCharset() {
return encoding.getCharsetName();
}
@Override
public void setCharset(String name) {
setEncoding(name);
}
@Override
public int compareTo(byte[] value, int offset, int length) {
// Use subsequence match instead of full sequence match to adhere to the
// principle of least surprise.
Matcher m = pattern.matcher(value);
return m.search(offset, length, pattern.getOptions()) < 0 ? 1 : 0;
}
@Override
public byte[] toByteArray() {
ComparatorProtos.RegexStringComparator.Builder builder =
ComparatorProtos.RegexStringComparator.newBuilder();
builder.setPattern(regex);
builder.setPatternFlags(joniToPatternFlags(pattern.getOptions()));
builder.setCharset(encoding.getCharsetName());
builder.setEngine(EngineType.JONI.name());
return builder.build().toByteArray();
}
private int patternToJoniFlags(int flags) {
int newFlags = 0;
if ((flags & Pattern.CASE_INSENSITIVE) != 0) {
newFlags |= Option.IGNORECASE;
}
if ((flags & Pattern.DOTALL) != 0) {
// This does NOT mean Pattern.MULTILINE
newFlags |= Option.MULTILINE;
}
if ((flags & Pattern.MULTILINE) != 0) {
// This is what Java 8's Nashorn engine does when using joni and
// translating Pattern's MULTILINE flag
newFlags &= ~Option.SINGLELINE;
newFlags |= Option.NEGATE_SINGLELINE;
}
return newFlags;
}
private int joniToPatternFlags(int flags) {
int newFlags = 0;
if ((flags & Option.IGNORECASE) != 0) {
newFlags |= Pattern.CASE_INSENSITIVE;
}
// This does NOT mean Pattern.MULTILINE, this is equivalent to Pattern.DOTALL
if ((flags & Option.MULTILINE) != 0) {
newFlags |= Pattern.DOTALL;
}
// This means Pattern.MULTILINE. Nice
if ((flags & Option.NEGATE_SINGLELINE) != 0) {
newFlags |= Pattern.MULTILINE;
}
return newFlags;
}
private void setEncoding(String name) {
EncodingDB.Entry e = EncodingDB.getEncodings().get(Bytes.toBytes(name));
if (e != null) {
encoding = e.getEncoding();
} else {
throw new IllegalCharsetNameException(name);
}
}
}
}