co.cask.cdap.api.dataset.lib.CompositeDatasetAdmin.java Source code

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Here is the source code for co.cask.cdap.api.dataset.lib.CompositeDatasetAdmin.java

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/*
 * Copyright  2014 Cask Data, Inc.
 *
 * Licensed 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 co.cask.cdap.api.dataset.lib;

import co.cask.cdap.api.annotation.Beta;
import co.cask.cdap.api.dataset.DatasetAdmin;
import com.google.common.collect.ImmutableList;
import com.google.common.io.Closeables;

import java.io.IOException;
import java.util.Collection;
import java.util.List;

/**
 * Implementation of {@link DatasetAdmin} that propagates administrative operations to the given list of
 * {@link co.cask.cdap.api.dataset.DatasetAdmin}s
 */
@Beta
public class CompositeDatasetAdmin implements DatasetAdmin {
    private final List<DatasetAdmin> delegates;

    /**
     * Constructor that takes list of dataset admins
     * @param admins list of dataset admins
     */
    public CompositeDatasetAdmin(Collection<? extends DatasetAdmin> admins) {
        this.delegates = ImmutableList.copyOf(admins);
    }

    /**
     * Constructor that takes list of dataset admins
     * @param admins list of dataset admins
     */
    public CompositeDatasetAdmin(DatasetAdmin... admins) {
        this.delegates = ImmutableList.copyOf(admins);
    }

    @Override
    public boolean exists() throws IOException {
        boolean exists = true;
        for (DatasetAdmin admin : delegates) {
            exists = exists && admin.exists();
        }
        return exists;
    }

    @Override
    public void create() throws IOException {
        for (DatasetAdmin admin : delegates) {
            admin.create();
        }
    }

    @Override
    public void drop() throws IOException {
        for (DatasetAdmin admin : delegates) {
            admin.drop();
        }
    }

    @Override
    public void truncate() throws IOException {
        for (DatasetAdmin admin : delegates) {
            admin.truncate();
        }
    }

    @Override
    public void upgrade() throws IOException {
        for (DatasetAdmin admin : delegates) {
            admin.upgrade();
        }
    }

    @Override
    public void close() throws IOException {
        for (DatasetAdmin admin : delegates) {
            Closeables.closeQuietly(admin);
        }
    }
}