spring-data-jpa EscapeCharacter 源码
spring-data-jpa EscapeCharacter 代码
文件路径：/spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/query/EscapeCharacter.java
/*
* Copyright 2019-2022 the original author or authors.
*
* 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
*
* https://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.springframework.data.jpa.repository.query;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Stream;
import org.springframework.lang.Nullable;
/**
* A value type encapsulating an escape character for LIKE queries and the actually usage of it in escaping
* {@link String}s.
*
* @author Jens Schauder
* @author Oliver Drotbohm
*/
public final class EscapeCharacter {
public static final EscapeCharacter DEFAULT = EscapeCharacter.of('\\');
private static final List<String> TO_REPLACE = Arrays.asList("_", "%");
private final char escapeCharacter;
private EscapeCharacter(char escapeCharacter) {
this.escapeCharacter = escapeCharacter;
}
public static EscapeCharacter of(char escapeCharacter) {
return new EscapeCharacter(escapeCharacter);
}
/**
* Escapes all special like characters ({@code _}, {@code %}) using the configured escape character.
*
* @param value may be {@literal null}.
* @return
*/
@Nullable
public String escape(@Nullable String value) {
return value == null //
? null //
: Stream.concat(Stream.of(String.valueOf(escapeCharacter)), TO_REPLACE.stream()) //
.reduce(value, (it, character) -> it.replace(character, this.escapeCharacter + character));
}
public char getEscapeCharacter() {
return this.escapeCharacter;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (!(o instanceof EscapeCharacter)) {
return false;
}
EscapeCharacter that = (EscapeCharacter) o;
return escapeCharacter == that.escapeCharacter;
}
@Override
public int hashCode() {
return escapeCharacter;
}
@Override
public String toString() {
return "EscapeCharacter(escapeCharacter=" + this.getEscapeCharacter() + ")";
}
}
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