com.switchfly.inputvalidation.sanitizer.CleanPatternSanitizer.java Source code

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Here is the source code for com.switchfly.inputvalidation.sanitizer.CleanPatternSanitizer.java

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/*
 * Copyright 2012 Switchfly
 *
 * 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.switchfly.inputvalidation.sanitizer;

import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.lang.StringUtils;

/**
 * Strips anything not matched by the acceptedPattern
 */
public class CleanPatternSanitizer implements Sanitizer<String> {
    public static final int FLAGS = Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE
            | Pattern.MULTILINE;
    private final Pattern _pattern;

    public CleanPatternSanitizer(Pattern acceptedPattern) {
        _pattern = acceptedPattern;
    }

    public CleanPatternSanitizer(String acceptedPattern) {
        _pattern = Pattern.compile(acceptedPattern, FLAGS);
    }

    @Override
    public String execute(String content) {
        if (StringUtils.isBlank(content)) {
            return content;
        }
        Matcher matcher = _pattern.matcher(content);
        StringBuilder builder = new StringBuilder();
        while (matcher.find()) {
            builder.append(matcher.group());
        }
        return builder.toString();
    }
}