/*
* Copyright 1999-2015 dangdang.com.
* <p>
* 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.
* </p>
*/
package com.dangdang.ddframe.rdb.sharding.parser.result.router;
import com.dangdang.ddframe.rdb.sharding.parser.result.router.Condition.BinaryOperator;
import com.dangdang.ddframe.rdb.sharding.parser.result.router.Condition.Column;
import com.google.common.base.Optional;
import lombok.ToString;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/**
* 条件对象上下文.
*
* @author zhangliang
*/
@ToString
public final class ConditionContext {
private final Map<Column, Condition> conditions = new LinkedHashMap<>();
/**
* 添加条件对象.
*
* @param condition 条件对象
*/
public void add(final Condition condition) {
// TODO 自关联有问题,表名可考虑使用别名对应
conditions.put(condition.getColumn(), condition);
}
/**
* 查找条件对象.
*
* @param table 表名称
* @param column 列名称
* @return 条件对象
*/
public Optional<Condition> find(final String table, final String column) {
return Optional.fromNullable(conditions.get(new Column(column, table)));
}
/**
* 查找条件对象.
*
* @param table 表名称
* @param column 列名称
* @param operator 操作符
* @return 条件对象
*/
public Optional<Condition> find(final String table, final String column, final BinaryOperator operator) {
Optional<Condition> result = find(table, column);
if (!result.isPresent()) {
return result;
}
return result.get().getOperator() == operator ? result : Optional.<Condition>absent();
}
public boolean isEmpty() {
return conditions.isEmpty();
}
public void clear() {
conditions.clear();
}
public Collection<Condition> getAllConditions() {
return conditions.values();
}
/**
* 解析参数中间的新数据.
*
* @param parameters 参数列表
*/
public void setNewConditionValue(final List<Object> parameters) {
for (Condition each : conditions.values()) {
if (each.getValueIndices().isEmpty()) {
continue;
}
for (int i = 0; i < each.getValueIndices().size(); i++) {
Object value = parameters.get(each.getValueIndices().get(i));
if (value instanceof Comparable<?>) {
each.getValues().set(i, (Comparable<?>) value);
} else {
each.getValues().set(i, "");
}
}
}
}
}