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A web service test double for all occasions

There is a newer version: 3.0.1

package com.github.tomakehurst.wiremock.common;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import static com.google.common.base.Preconditions.checkArgument;

public class Metadata extends LinkedHashMap {

    public Metadata() {
    }

    public Metadata(Map data) {
        super(data);
    }

    public Integer getInt(String key) {
        return checkValidityAndCast(key, Integer.class);
    }

    public Boolean getBoolean(String key) {
        return checkValidityAndCast(key, Boolean.class);
    }

    public String getString(String key) {
        return checkValidityAndCast(key, String.class);
    }

    public List getList(String key) {
        return checkValidityAndCast(key, List.class);
    }

    @SuppressWarnings("unchecked")
    public Metadata getMetadata(String key) {
        checkKeyPresent(key);
        checkArgument(Map.class.isAssignableFrom(get(key).getClass()), key + " is not a map");
        return new Metadata((Map) get(key));
    }

    @SuppressWarnings("unchecked")
    private  T checkValidityAndCast(String key, Class type) {
        checkKeyPresent(key);
        checkArgument(type.isAssignableFrom(get(key).getClass()), key + " is not of type " + type.getSimpleName());
        return (T) get(key);
    }

    private void checkKeyPresent(String key) {
        checkArgument(containsKey(key), key + "' not present");
    }

    public static Builder metadata() {
        return new Builder();
    }

    public static class Builder {

        private final ImmutableMap.Builder mapBuilder;

        public Builder() {
            this.mapBuilder = ImmutableMap.builder();
        }

        public Builder attr(String key, Object value) {
            mapBuilder.put(key, value);
            return this;
        }

        public Builder list(String key, Object... values) {
            mapBuilder.put(key, ImmutableList.copyOf(values));
            return this;
        }

        public Builder attr(String key, Metadata.Builder metadataBuilder) {
            mapBuilder.put(key, metadataBuilder.build());
            return this;
        }

        public Metadata build() {
            return new Metadata(mapBuilder.build());
        }
    }
}