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MaskFromXToYMaskAlgorithm.java
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/
MaskFromXToYMaskAlgorithm.java
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/*
* 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.shardingsphere.mask.algorithm.cover;
import com.google.common.base.Strings;
import org.apache.shardingsphere.infra.algorithm.core.exception.AlgorithmInitializationException;
import org.apache.shardingsphere.infra.exception.core.ShardingSpherePreconditions;
import org.apache.shardingsphere.mask.algorithm.MaskAlgorithmPropertiesChecker;
import org.apache.shardingsphere.mask.spi.MaskAlgorithm;
import java.util.Properties;
/**
* Mask from x to y mask algorithm.
*/
public final class MaskFromXToYMaskAlgorithm implements MaskAlgorithm<Object, String> {
private static final String FROM_X = "from-x";
private static final String TO_Y = "to-y";
private static final String REPLACE_CHAR = "replace-char";
private Integer fromX;
private Integer toY;
private Character replaceChar;
@Override
public void init(final Properties props) {
fromX = createFromX(props);
toY = createToY(props);
replaceChar = createReplaceChar(props);
ShardingSpherePreconditions.checkState(fromX <= toY, () -> new AlgorithmInitializationException(this, "fromX must be less than or equal to toY"));
}
private Integer createFromX(final Properties props) {
MaskAlgorithmPropertiesChecker.checkPositiveInteger(props, FROM_X, this);
return Integer.parseInt(props.getProperty(FROM_X));
}
private Integer createToY(final Properties props) {
MaskAlgorithmPropertiesChecker.checkPositiveInteger(props, TO_Y, this);
return Integer.parseInt(props.getProperty(TO_Y));
}
private Character createReplaceChar(final Properties props) {
MaskAlgorithmPropertiesChecker.checkSingleChar(props, REPLACE_CHAR, this);
return props.getProperty(REPLACE_CHAR).charAt(0);
}
@Override
public String mask(final Object plainValue) {
String result = null == plainValue ? null : String.valueOf(plainValue);
if (Strings.isNullOrEmpty(result)) {
return result;
}
if (result.length() <= fromX) {
return result;
}
char[] chars = result.toCharArray();
for (int i = fromX, minLength = Math.min(toY, chars.length - 1); i <= minLength; i++) {
chars[i] = replaceChar;
}
return new String(chars);
}
@Override
public String getType() {
return "MASK_FROM_X_TO_Y";
}
}