io.streamthoughts.azkarra.api.components.qualifier.VersionQualifier Maven / Gradle / Ivy

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/*
 * Copyright 2019-2020 StreamThoughts.
 *
 * 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 io.streamthoughts.azkarra.api.components.qualifier;

import io.streamthoughts.azkarra.api.components.ComponentDescriptor;
import io.streamthoughts.azkarra.api.components.Qualifier;
import io.streamthoughts.azkarra.api.util.Version;

import java.util.Objects;
import java.util.stream.Stream;

public class VersionQualifier implements Qualifier {

    private final Version version;

    /**
     * Creates a new {@link VersionQualifier} instance.
     *
     * @param version   the {@link Version}.
     */
    VersionQualifier(final Version version) {
        this.version = Objects.requireNonNull(version, "version cannot be null");
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Stream> filter(final Class componentType,
                                                 final Stream> candidates) {
        return candidates
            .filter(ComponentDescriptor::isVersioned)
            .filter(desc -> desc.version().equals(version));
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof VersionQualifier)) return false;
        VersionQualifier that = (VersionQualifier) o;
        return version.equals(that.version);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int hashCode() {
        return Objects.hash(version);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
        return "@Versioned(" + version + ")";
    }
}