/*
* Copyright 2013 Netflix, Inc.
*
* Licensed 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 com.netflix.suro.routing;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.netflix.suro.message.MessageContainer;
import java.util.regex.Pattern;
/**
* An implementation of {@link Filter} that coerced message payload to a string, and applies
* regex to the coerced string. The match is partial.
*
*/
public class RegexFilter implements Filter {
public static final String TYPE = "regex";
public static final String JSON_PROPERTY_REGEX = "regex";
private final Pattern filterPattern;
@JsonCreator
public RegexFilter(@JsonProperty(JSON_PROPERTY_REGEX) String regex) {
filterPattern = Pattern.compile(regex);
}
@JsonProperty(JSON_PROPERTY_REGEX)
public String getRegex() {
return filterPattern.pattern();
}
/**
*
* @param message The message that is to be matched against the filter's regex pattern
* @return true if the message's string representation contains the regex pattern. False otherwise.
* @throws Exception If filtering fails. For example, if the given message can't be coerced into a string.
*/
@Override
public boolean doFilter(MessageContainer message) throws Exception {
return filterPattern.matcher(message.getEntity(String.class)).find();
}
}