| /* |
| * 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.parquet.hadoop.metadata; |
| |
| import java.io.Serializable; |
| import java.util.Arrays; |
| import java.util.Iterator; |
| |
| import static org.apache.parquet.Preconditions.checkNotNull; |
| |
| public final class ColumnPath implements Iterable<String>, Serializable { |
| |
| private static Canonicalizer<ColumnPath> paths = new Canonicalizer<ColumnPath>() { |
| @Override |
| protected ColumnPath toCanonical(ColumnPath value) { |
| String[] path = new String[value.p.length]; |
| for (int i = 0; i < value.p.length; i++) { |
| path[i] = value.p[i].intern(); |
| } |
| return new ColumnPath(path); |
| } |
| }; |
| |
| public static ColumnPath fromDotString(String path) { |
| checkNotNull(path, "path"); |
| return get(path.split("\\.")); |
| } |
| |
| public static ColumnPath get(String... path){ |
| return paths.canonicalize(new ColumnPath(path)); |
| } |
| |
| private final String[] p; |
| |
| private ColumnPath(String[] path) { |
| this.p = path; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj instanceof ColumnPath) { |
| return Arrays.equals(p, ((ColumnPath)obj).p); |
| } |
| return false; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Arrays.hashCode(p); |
| } |
| |
| public String toDotString() { |
| return String.join(".", p); |
| } |
| |
| @Override |
| public String toString() { |
| return Arrays.toString(p); |
| } |
| |
| @Override |
| public Iterator<String> iterator() { |
| return Arrays.asList(p).iterator(); |
| } |
| |
| public int size() { |
| return p.length; |
| } |
| |
| public String[] toArray() { |
| return p; |
| } |
| } |