modules/core/src/main/java/org/apache/ignite/internal/binary/builder/BinaryAbstractLazyValue.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.binary.builder;

/**
 *
 */
abstract class BinaryAbstractLazyValue implements BinaryLazyValue {
    /** */
    protected Object val;

    /** */
    protected final BinaryBuilderReader reader;

    /** */
    protected final int valOff;

    /**
     * @param reader Reader.
     * @param valOff Value.
     */
    protected BinaryAbstractLazyValue(BinaryBuilderReader reader, int valOff) {
        this.reader = reader;
        this.valOff = valOff;
    }

    /**
     * @return Value.
     */
    protected abstract Object init();

    /** {@inheritDoc} */
    @Override public Object value() {
        if (val == null) {
            val = init();

            assert val != null;
        }

        return val;
    }
}