spring NamedBindMarkers 源码
spring NamedBindMarkers 代码
文件路径：/spring-r2dbc/src/main/java/org/springframework/r2dbc/core/binding/NamedBindMarkers.java
/*
* Copyright 2002-2020 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.r2dbc.core.binding;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.function.Function;
import org.springframework.util.Assert;
/**
* Name-based bind markers.
*
* @author Mark Paluch
* @since 5.3
*/
class NamedBindMarkers implements BindMarkers {
private static final AtomicIntegerFieldUpdater<NamedBindMarkers> COUNTER_INCREMENTER =
AtomicIntegerFieldUpdater.newUpdater(NamedBindMarkers.class, "counter");
private final String prefix;
private final String namePrefix;
private final int nameLimit;
private final Function<String, String> hintFilterFunction;
// access via COUNTER_INCREMENTER
@SuppressWarnings("unused")
private volatile int counter;
NamedBindMarkers(String prefix, String namePrefix, int nameLimit, Function<String, String> hintFilterFunction) {
this.prefix = prefix;
this.namePrefix = namePrefix;
this.nameLimit = nameLimit;
this.hintFilterFunction = hintFilterFunction;
}
@Override
public BindMarker next() {
String name = nextName();
return new NamedBindMarker(this.prefix + name, name);
}
@Override
public BindMarker next(String hint) {
Assert.notNull(hint, "Name hint must not be null");
String name = nextName() + this.hintFilterFunction.apply(hint);
if (name.length() > this.nameLimit) {
name = name.substring(0, this.nameLimit);
}
return new NamedBindMarker(this.prefix + name, name);
}
private String nextName() {
int index = COUNTER_INCREMENTER.getAndIncrement(this);
return this.namePrefix + index;
}
/**
* A single named bind marker.
*/
static class NamedBindMarker implements BindMarker {
private final String placeholder;
private final String identifier;
NamedBindMarker(String placeholder, String identifier) {
this.placeholder = placeholder;
this.identifier = identifier;
}
@Override
public String getPlaceholder() {
return this.placeholder;
}
@Override
public void bind(BindTarget target, Object value) {
target.bind(this.identifier, value);
}
@Override
public void bindNull(BindTarget target, Class<?> valueType) {
target.bindNull(this.identifier, valueType);
}
}
}
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