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Azkarra Streams Core API

There is a newer version: 0.9.2

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

public class NamedQualifier implements Qualifier {

    private final String name;
    private final boolean equals;

    /**
     * Creates a new {@link NamedQualifier} instance.
     *
     * @param name  the component name.
     */
    NamedQualifier(final String name) {
        this(name, true);
    }

    /**
     * Creates a new {@link NamedQualifier} instance.
     *
     * @param name  the component name.
     */
    NamedQualifier(final String name, final Boolean equals) {
        this.name = Objects.requireNonNull(name, "name cannot be null");
        this.equals = equals;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Stream> filter(final Class componentType,
                                                 final Stream> candidates) {
        return candidates.filter(this::matches);
    }

    protected boolean matches(final ComponentDescriptor descriptor) {
        final String name = descriptor.name();
        return equals == name.equalsIgnoreCase(this.name);
    }

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

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

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