server/container/guice/guice-common/src/test/java/org/apache/james/FakePropertiesProvider.java

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package org.apache.james;

import java.io.FileNotFoundException;
import java.util.Arrays;
import java.util.Optional;

import org.apache.commons.configuration2.Configuration;
import org.apache.commons.lang3.StringUtils;
import org.apache.james.filesystem.api.FileSystem;
import org.apache.james.utils.PropertiesProvider;

import com.google.common.collect.ImmutableMap;

public class FakePropertiesProvider extends PropertiesProvider {

    public static final FileSystem NULL_FILE_SYSTEM = null;

    private ImmutableMap<String, Configuration> configurations;

    public FakePropertiesProvider(ImmutableMap<String, Configuration> configurations) {
        super(NULL_FILE_SYSTEM, org.apache.james.server.core.configuration.Configuration.builder()
            .workingDirectory("fakePath")
            .build()
            .configurationPath());
        this.configurations = configurations;
    }


    @Override
    public Configuration getConfiguration(String fileName) throws FileNotFoundException {
        if (configurations.containsKey(fileName)) {
            return configurations.get(fileName);
        } else {
            throw new FileNotFoundException(
                "no configuration defined for " +
                    fileName +
                    " know configurations are (" +
                    StringUtils.join(configurations.keySet(), ",") +
                    ")");
        }
    }

    @Override
    public Configuration getConfigurations(String... filenames) throws FileNotFoundException {
        return Arrays.stream(filenames)
            .map(filename -> Optional.ofNullable(configurations.get(filename)))
            .flatMap(Optional::stream)
            .findFirst()
            .orElseThrow(() -> new FileNotFoundException(
                "no configuration defined for " +
                    StringUtils.join(filenames, ",") +
                    " know configurations are (" +
                    StringUtils.join(configurations.keySet(), ",") +
                    ")"));
    }

    public static FakePropertiesProviderBuilder builder() {
        return new FakePropertiesProviderBuilder();
    }

    public static class FakePropertiesProviderBuilder {
        private final ImmutableMap.Builder<String, Configuration> configurations;

        public FakePropertiesProviderBuilder() {
            configurations = new ImmutableMap.Builder<>();
        }

        public FakePropertiesProviderBuilder register(String filename,
                                                      Configuration configuration) {
            configurations.put(filename, configuration);
            return this;
        }

        public FakePropertiesProvider build() {
            return new FakePropertiesProvider(configurations.build());
        }
    }
}