parquet.hadoop.metadata.ColumnPath Maven / Gradle / Ivy
/**
* Copyright 2012 Twitter, 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 parquet.hadoop.metadata;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
public final class ColumnPath implements Iterable {
private static Map paths = new HashMap();
public static ColumnPath get(String... path){
ColumnPath key = new ColumnPath(path);
ColumnPath cached = paths.get(key);
if (cached == null) {
for (int i = 0; i < path.length; i++) {
path[i] = path[i].intern();
}
cached = key;
paths.put(key, cached);
}
return cached;
}
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);
}
@Override
public String toString() {
return Arrays.toString(p);
}
@Override
public Iterator iterator() {
return Arrays.asList(p).iterator();
}
public int size() {
return p.length;
}
public String[] toArray() {
return p;
}
}