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A table format for huge analytic datasets
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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.iceberg.catalog;
import java.util.Arrays;
import org.apache.iceberg.relocated.com.google.common.base.Joiner;
import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
/**
* A namespace in a {@link Catalog}.
*/
public class Namespace {
private static final Namespace EMPTY_NAMESPACE = new Namespace(new String[] {});
private static final Joiner DOT = Joiner.on('.');
public static Namespace empty() {
return EMPTY_NAMESPACE;
}
public static Namespace of(String... levels) {
Preconditions.checkArgument(null != levels, "Cannot create Namespace from null array");
if (levels.length == 0) {
return empty();
}
return new Namespace(levels);
}
private final String[] levels;
private Namespace(String[] levels) {
this.levels = levels;
}
public String[] levels() {
return levels;
}
public String level(int pos) {
return levels[pos];
}
public boolean isEmpty() {
return levels.length == 0;
}
@Override
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (other == null || getClass() != other.getClass()) {
return false;
}
Namespace namespace = (Namespace) other;
return Arrays.equals(levels, namespace.levels);
}
@Override
public int hashCode() {
return Arrays.hashCode(levels);
}
@Override
public String toString() {
return DOT.join(levels);
}
}
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