com.github.jcustenborder.kafka.connect.utils.config.validators.ValidCharset.java Source code

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Here is the source code for com.github.jcustenborder.kafka.connect.utils.config.validators.ValidCharset.java

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/**
 * Copyright  2018 Jeremy Custenborder (jcustenborder@gmail.com)
 *
 * 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.
 */
package com.github.jcustenborder.kafka.connect.utils.config.validators;

import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableSet;
import org.apache.kafka.common.config.ConfigDef;
import org.apache.kafka.common.config.ConfigException;

import java.nio.charset.Charset;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

class ValidCharset implements ConfigDef.Validator {
    private final Set<String> allowedCharsets;

    public ValidCharset() {
        this(ImmutableSet.copyOf(Charset.availableCharsets().keySet()));
    }

    public ValidCharset(String... charsets) {
        this(ImmutableSet.copyOf(charsets));
    }

    public ValidCharset(Iterable<String> charsets) {
        this.allowedCharsets = ImmutableSet.copyOf(charsets);
    }

    static void validate(String config, String value) {
        try {
            Charset.forName(value);
        } catch (Exception ex) {
            ConfigException configException = new ConfigException(config, value, "Charset is invalid.");
            configException.initCause(ex);

            throw configException;
        }
    }

    @Override
    public void ensureValid(String config, Object value) {
        if (value instanceof String) {
            validate(config, (String) value);
        } else if (value instanceof List) {
            List<String> values = (List<String>) value;
            for (String v : values) {
                validate(config, v);
            }
        } else {
            throw new ConfigException(config, value, "Must be a string or list.");
        }
    }

    @Override
    public String toString() {
        final List<String> sortedCharsets = this.allowedCharsets.stream().sorted().collect(Collectors.toList());
        final StringBuilder builder = new StringBuilder();
        builder.append("Valid values: '");
        Joiner.on("', '").appendTo(builder, sortedCharsets);
        builder.append('\'');
        return builder.toString();
    }
}