kernel/single/core/src/main/java/org/apache/shardingsphere/single/yaml/config/swapper/SingleRuleConfigurationRepositoryTupleSwapper.java

/*
 * 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.single.yaml.config.swapper;

import org.apache.shardingsphere.infra.util.yaml.YamlEngine;
import org.apache.shardingsphere.infra.util.yaml.datanode.RepositoryTuple;
import org.apache.shardingsphere.mode.path.rule.RuleNodePath;
import org.apache.shardingsphere.mode.spi.RepositoryTupleSwapper;
import org.apache.shardingsphere.single.constant.SingleOrder;
import org.apache.shardingsphere.single.metadata.nodepath.SingleRuleNodePathProvider;
import org.apache.shardingsphere.single.yaml.config.pojo.YamlSingleRuleConfiguration;

import java.util.Collection;
import java.util.Collections;
import java.util.Optional;
import java.util.stream.Collectors;

/**
 * Single rule configuration repository tuple swapper.
 */
public final class SingleRuleConfigurationRepositoryTupleSwapper implements RepositoryTupleSwapper<YamlSingleRuleConfiguration> {
    
    private final RuleNodePath ruleNodePath = new SingleRuleNodePathProvider().getRuleNodePath();
    
    @Override
    public Collection<RepositoryTuple> swapToRepositoryTuples(final YamlSingleRuleConfiguration yamlRuleConfig) {
        return Collections.singleton(new RepositoryTuple(SingleRuleNodePathProvider.TABLES, YamlEngine.marshal(yamlRuleConfig)));
    }
    
    @Override
    public Optional<YamlSingleRuleConfiguration> swapToObject(final Collection<RepositoryTuple> repositoryTuples) {
        for (RepositoryTuple each : repositoryTuples.stream().filter(each -> ruleNodePath.getRoot().isValidatedPath(each.getKey())).collect(Collectors.toList())) {
            if (ruleNodePath.getUniqueItem(SingleRuleNodePathProvider.TABLES).isValidatedPath(each.getKey())) {
                return Optional.of(YamlEngine.unmarshal(each.getValue(), YamlSingleRuleConfiguration.class));
            }
        }
        return Optional.empty();
    }
    
    @Override
    public String getRuleTypeName() {
        return "single";
    }
    
    @Override
    public int getOrder() {
        return SingleOrder.ORDER;
    }
    
    @Override
    public Class<YamlSingleRuleConfiguration> getTypeClass() {
        return YamlSingleRuleConfiguration.class;
    }
}