org.eclipse.ditto.connectivity.model.ImmutableSourceMetrics Maven / Gradle / Ivy

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Eclipse Ditto is a framework for creating and managing digital twins in the IoT.
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/*
 * Copyright (c) 2017 Contributors to the Eclipse Foundation
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0
 *
 * SPDX-License-Identifier: EPL-2.0
 */
package org.eclipse.ditto.connectivity.model;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.function.Predicate;
import java.util.stream.Collectors;

import javax.annotation.concurrent.Immutable;

import org.eclipse.ditto.json.JsonCollectors;
import org.eclipse.ditto.json.JsonFactory;
import org.eclipse.ditto.json.JsonField;
import org.eclipse.ditto.json.JsonObject;
import org.eclipse.ditto.json.JsonObjectBuilder;
import org.eclipse.ditto.base.model.json.JsonSchemaVersion;

/**
 * Immutable implementation of {@link SourceMetrics}.
 */
@Immutable
final class ImmutableSourceMetrics implements SourceMetrics {

    private final Map addressMetrics;

    private ImmutableSourceMetrics(final Map addressMetrics) {
        this.addressMetrics = Collections.unmodifiableMap(new HashMap<>(addressMetrics));
    }

    /**
     * Creates a new {@code ImmutableSourceMetrics} instance.
     *
     * @param addressMetrics the AddressMetrics for each source
     * @return a new instance of ImmutableSourceMetrics
     */
    public static ImmutableSourceMetrics of(final Map addressMetrics) {
        return new ImmutableSourceMetrics(addressMetrics);
    }

    @Override
    public Map getAddressMetrics() {
        return addressMetrics;
    }

    @Override
    public JsonObject toJson(final JsonSchemaVersion schemaVersion, final Predicate thePredicate) {
        final Predicate predicate = schemaVersion.and(thePredicate);
        final JsonObjectBuilder jsonObjectBuilder = JsonFactory.newObjectBuilder();

        jsonObjectBuilder.set(JsonFields.ADDRESS_METRICS, addressMetrics.isEmpty()
                ? JsonFactory.nullObject()
                : addressMetricsToJson(), predicate);
        return jsonObjectBuilder.build();
    }

    private JsonObject addressMetricsToJson() {
        return addressMetrics.entrySet().stream()
                .map(e -> ImmutableAddressMetric.toJsonField(e.getKey(), e.getValue()))
                .collect(JsonCollectors.fieldsToObject());
    }

    /**
     * Creates a new {@code SourceMetrics} object from the specified JSON object.
     *
     * @param jsonObject a JSON object which provides the data for the SourceMetrics to be created.
     * @return a new SourceMetrics which is initialised with the extracted data from {@code jsonObject}.
     * @throws NullPointerException if {@code jsonObject} is {@code null}.
     * @throws org.eclipse.ditto.json.JsonParseException if {@code jsonObject} is not an appropriate JSON object.
     */
    public static SourceMetrics fromJson(final JsonObject jsonObject) {
        final Map readAddressMetrics = jsonObject.getValue(JsonFields.ADDRESS_METRICS)
                .map(obj -> obj.stream()
                        .collect(Collectors.toMap(
                                f -> f.getKey().toString(),
                                f -> ConnectivityModelFactory.addressMetricFromJson(f.getValue().asObject()))))
                .orElse(Collections.emptyMap());
        return ImmutableSourceMetrics.of(readAddressMetrics);
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof ImmutableSourceMetrics)) {
            return false;
        }
        final ImmutableSourceMetrics that = (ImmutableSourceMetrics) o;
        return Objects.equals(addressMetrics, that.addressMetrics);
    }

    @Override
    public int hashCode() {
        return Objects.hash(addressMetrics);
    }

    @Override
    public String toString() {
        return getClass().getSimpleName() + " [" +
                "addressMetrics=" + addressMetrics +
                "]";
    }

}