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This module contains all API code for Apache Fluo. External dependencies should be limited. Any changes to public methods should be avoided. While the API module does not have compile time dependency on fluo-core, you must include fluo-core as a run-time dependency.

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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.fluo.api.client;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import com.google.common.collect.Collections2;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Maps;
import org.apache.fluo.api.data.Bytes;
import org.apache.fluo.api.data.Column;
import org.apache.fluo.api.data.RowColumn;

/**
 * This class provides default implementations for many of the classes in SnapshotBase. It exists to
 * make implementing SnapshotBase easier.
 */

public abstract class AbstractSnapshotBase implements SnapshotBase {

  public Bytes get(Bytes row, Column column, Bytes defaultValue) {
    Bytes ret = get(row, column);
    if (ret == null) {
      return defaultValue;
    }

    return ret;
  }

  public Map get(Bytes row, Column... columns) {
    return get(row, ImmutableSet.copyOf(columns));
  }

  public Map> get(Collection rows, Column... columns) {
    return get(rows, ImmutableSet.copyOf(columns));
  }

  public Map gets(Collection rowColumns) {
    Map bytesMap = get(rowColumns);
    return Maps.transformValues(bytesMap, b -> b.toString());
  }

  public Map> gets(Collection rows,
      Set columns) {
    Map> rcvs =
        get(Collections2.transform(rows, s -> Bytes.of(s)), columns);
    Map> ret = new HashMap<>(rcvs.size());

    for (Entry> entry : rcvs.entrySet()) {
      ret.put(entry.getKey().toString(), Maps.transformValues(entry.getValue(), b -> b.toString()));
    }
    return ret;
  }

  public Map> gets(Collection rows,
      Column... columns) {
    return gets(rows, ImmutableSet.copyOf(columns));
  }

  public String gets(CharSequence row, Column column) {
    Bytes val = get(Bytes.of(row), column);
    if (val == null) {
      return null;
    }
    return val.toString();
  }

  public String gets(CharSequence row, Column column, String defaultValue) {
    Bytes val = get(Bytes.of(row), column);
    if (val == null) {
      return defaultValue;
    }

    return val.toString();
  }

  public Map gets(CharSequence row, Set columns) {
    Map values = get(Bytes.of(row), columns);
    return Maps.transformValues(values, b -> b.toString());
  }

  public Map gets(CharSequence row, Column... columns) {
    return gets(row, ImmutableSet.copyOf(columns));
  }
}