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Apache Log4j Layout for JSON template.
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.logging.log4j.layout.template.json.util;

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Objects;

public class MapAccessor {

    private final Map map;

    public MapAccessor(final Map map) {
        this.map = Objects.requireNonNull(map, "map");
    }

    public String getString(final String key) {
        final String[] path = {key};
        return getObject(path, String.class);
    }

    public String getString(final String[] path) {
        return getObject(path, String.class);
    }

    public boolean getBoolean(final String key, final boolean defaultValue) {
        final String[] path = {key};
        return getBoolean(path, defaultValue);
    }

    public boolean getBoolean(final String[] path, final boolean defaultValue) {
        final Boolean value = getObject(path, Boolean.class);
        return value == null ? defaultValue : value;
    }

    public Boolean getBoolean(final String key) {
        final String[] path = {key};
        return getObject(path, Boolean.class);
    }

    public Boolean getBoolean(final String[] path) {
        return getObject(path, Boolean.class);
    }

    public Integer getInteger(final String key) {
        final String[] path = {key};
        return getInteger(path);
    }

    public Integer getInteger(final String[] path) {
        return getObject(path, Integer.class);
    }

    public boolean exists(final String key) {
        final String[] path = {key};
        return exists(path);
    }

    public boolean exists(final String[] path) {
        final Object value = getObject(path);
        return value != null;
    }

    public  List getList(final String key, final Class clazz) {
        final String[] path = {key};
        return getList(path, clazz);
    }

    public  List getList(final String[] path, final Class clazz) {

        // Access the object.
        final Object value = getObject(path);
        if (value == null) {
            return null;
        }

        // Check the type.
        if (!(value instanceof List)) {
            final String message = String.format(
                    "was expecting a List<%s> at path %s: %s (of type %s)",
                    clazz,
                    Arrays.asList(path),
                    value,
                    value.getClass().getCanonicalName());
            throw new IllegalArgumentException(message);
        }

        // Check the element types.
        @SuppressWarnings("unchecked")
        final List