spring IndexedBindMarkers 源码
spring IndexedBindMarkers 代码
文件路径：/spring-r2dbc/src/main/java/org/springframework/r2dbc/core/binding/IndexedBindMarkers.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;
/**
* Index-based bind marker. This implementation creates indexed bind
* markers using a numeric index and an optional prefix for bind markers
* to be represented within the query string.
*
* @author Mark Paluch
* @author Jens Schauder
* @since 5.3
*/
class IndexedBindMarkers implements BindMarkers {
private static final AtomicIntegerFieldUpdater<IndexedBindMarkers> COUNTER_INCREMENTER =
AtomicIntegerFieldUpdater.newUpdater(IndexedBindMarkers.class, "counter");
private final int offset;
private final String prefix;
// access via COUNTER_INCREMENTER
@SuppressWarnings("unused")
private volatile int counter;
/**
* Create a new {@link IndexedBindMarker} instance given {@code prefix} and {@code beginWith}.
* @param prefix bind parameter prefix
* @param beginWith the first index to use
*/
IndexedBindMarkers(String prefix, int beginWith) {
this.counter = 0;
this.prefix = prefix;
this.offset = beginWith;
}
@Override
public BindMarker next() {
int index = COUNTER_INCREMENTER.getAndIncrement(this);
return new IndexedBindMarker(this.prefix + "" + (index + this.offset), index);
}
/**
* A single indexed bind marker.
* @author Mark Paluch
*/
static class IndexedBindMarker implements BindMarker {
private final String placeholder;
private final int index;
IndexedBindMarker(String placeholder, int index) {
this.placeholder = placeholder;
this.index = index;
}
@Override
public String getPlaceholder() {
return this.placeholder;
}
@Override
public void bind(BindTarget target, Object value) {
target.bind(this.index, value);
}
@Override
public void bindNull(BindTarget target, Class<?> valueType) {
target.bindNull(this.index, valueType);
}
public int getIndex() {
return this.index;
}
}
}
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