org.apache.gobblin.metadata.GlobalMetadata.java Source code

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Here is the source code for org.apache.gobblin.metadata.GlobalMetadata.java

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/*
 * 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.gobblin.metadata;

import org.apache.gobblin.fork.CopyHelper;
import org.apache.gobblin.fork.CopyNotSupportedException;
import org.apache.gobblin.fork.Copyable;

import com.google.common.base.Optional;

import lombok.AccessLevel;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.EqualsAndHashCode;
import lombok.Getter;

/**
 * Global metadata
 * @param <S> schema type
 */
@AllArgsConstructor(access = AccessLevel.PRIVATE)
@EqualsAndHashCode
@Builder
public class GlobalMetadata<S> implements Copyable<GlobalMetadata<S>> {
    @Getter
    private S schema;

    @Override
    public GlobalMetadata<S> copy() throws CopyNotSupportedException {
        if (CopyHelper.isCopyable(schema)) {
            return new GlobalMetadata((S) CopyHelper.copy(schema));
        }

        throw new CopyNotSupportedException("Type is not copyable: " + schema.getClass().getName());
    }

    /**
     * Builder that takes in an input {@GlobalMetadata} to use as a base.
     * @param inputMetadata input metadata
     * @param outputSchema output schema to set in the builder
     * @param <SI> input schema type
     * @param <SO> output schema type
     * @return builder
     */
    public static <SI, SO> GlobalMetadataBuilder<SO> builderWithInput(GlobalMetadata<SI> inputMetadata,
            Optional<SO> outputSchema) {
        GlobalMetadataBuilder<SO> builder = (GlobalMetadataBuilder<SO>) builder();

        if (outputSchema.isPresent()) {
            builder.schema(outputSchema.get());
        }

        return builder;
    }
}