modules/core/src/main/java/org/apache/ignite/internal/processors/resource/GridResourceField.java

/*
 * 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.ignite.internal.processors.resource;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.util.Collection;
import org.apache.ignite.internal.util.typedef.internal.S;
import org.jetbrains.annotations.NotNull;

/**
 * Wrapper for data where resource should be injected.
 * Bean contains {@link Field} and {@link Annotation} for that class field.
 */
class GridResourceField {
    /** */
    static final GridResourceField[] EMPTY_ARRAY = new GridResourceField[0];

    /** Field where resource should be injected. */
    private final Field field;

    /** Resource annotation. */
    private final Annotation ann;

    /**
     * Creates new bean.
     *
     * @param field Field where resource should be injected.
     * @param ann Resource annotation.
     */
    GridResourceField(@NotNull Field field, @NotNull Annotation ann) {
        this.field = field;
        this.ann = ann;

        field.setAccessible(true);
    }

    /**
     * Gets class field object.
     *
     * @return Class field.
     */
    public Field getField() {
        return field;
    }

    /**
     * Gets annotation for class field object.
     *
     * @return Field annotation.
     */
    public Annotation getAnnotation() {
        return ann;
    }

    /**
     * Return {@code true} if field contains object that should be process too.
     */
    public boolean processFieldValue() {
        return ann == null;
    }

    /**
     * @param c Closure.
     */
    public static GridResourceField[] toArray(Collection<GridResourceField> c) {
        if (c.isEmpty())
            return EMPTY_ARRAY;

        return c.toArray(new GridResourceField[c.size()]);
    }

    /** {@inheritDoc} */
    @Override public String toString() {
        return S.toString(GridResourceField.class, this);
    }
}