org.springframework.boot.context.properties.source.ConfigurationPropertyNameAliases.java Source code

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Here is the source code for org.springframework.boot.context.properties.source.ConfigurationPropertyNameAliases.java

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/*
 * Copyright 2012-2019 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.boot.context.properties.source;

import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.springframework.util.Assert;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;

/**
 * Maintains a mapping of {@link ConfigurationPropertyName} aliases.
 *
 * @author Phillip Webb
 * @author Madhura Bhave
 * @since 2.0.0
 * @see ConfigurationPropertySource#withAliases(ConfigurationPropertyNameAliases)
 */
public final class ConfigurationPropertyNameAliases implements Iterable<ConfigurationPropertyName> {

    private final MultiValueMap<ConfigurationPropertyName, ConfigurationPropertyName> aliases = new LinkedMultiValueMap<>();

    public ConfigurationPropertyNameAliases() {
    }

    public ConfigurationPropertyNameAliases(String name, String... aliases) {
        addAliases(name, aliases);
    }

    public ConfigurationPropertyNameAliases(ConfigurationPropertyName name, ConfigurationPropertyName... aliases) {
        addAliases(name, aliases);
    }

    public void addAliases(String name, String... aliases) {
        Assert.notNull(name, "Name must not be null");
        Assert.notNull(aliases, "Aliases must not be null");
        addAliases(ConfigurationPropertyName.of(name), Arrays.stream(aliases).map(ConfigurationPropertyName::of)
                .toArray(ConfigurationPropertyName[]::new));
    }

    public void addAliases(ConfigurationPropertyName name, ConfigurationPropertyName... aliases) {
        Assert.notNull(name, "Name must not be null");
        Assert.notNull(aliases, "Aliases must not be null");
        this.aliases.addAll(name, Arrays.asList(aliases));
    }

    public List<ConfigurationPropertyName> getAliases(ConfigurationPropertyName name) {
        return this.aliases.getOrDefault(name, Collections.emptyList());
    }

    public ConfigurationPropertyName getNameForAlias(ConfigurationPropertyName alias) {
        return this.aliases.entrySet().stream().filter((e) -> e.getValue().contains(alias)).map(Map.Entry::getKey)
                .findFirst().orElse(null);
    }

    @Override
    public Iterator<ConfigurationPropertyName> iterator() {
        return this.aliases.keySet().iterator();
    }

}