org.apache.james.transport.mailets.MappingArgument.java Source code

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package org.apache.james.transport.mailets;

import java.util.List;

import javax.mail.MessagingException;

import org.apache.commons.lang3.tuple.Pair;

import com.github.steveash.guavate.Guavate;
import com.google.common.base.Preconditions;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableMap;

public class MappingArgument {

    public static String CONFIGURATION_ERROR_MESSAGE = "Invalid format, please respect key1;value1,key2;value2 format";

    public static ImmutableMap<String, String> parse(String mapping) throws MessagingException {
        Preconditions.checkArgument(mapping != null, "mapping should not be null");

        if (mapping.trim().isEmpty()) {
            return ImmutableMap.of();
        }

        return Splitter.on(',').omitEmptyStrings().splitToList(mapping).stream().map(MappingArgument::parseKeyValue)
                .collect(Guavate.toImmutableMap(Pair::getLeft, Pair::getRight));
    }

    private static Pair<String, String> parseKeyValue(String keyValue) {
        List<String> pair = Splitter.on(';').trimResults().splitToList(keyValue);

        if (pair.size() != 2) {
            throw new IllegalArgumentException(CONFIGURATION_ERROR_MESSAGE);
        }

        return Pair.of(pair.get(0), pair.get(1));
    }
}