Github user vdiravka commented on a diff in the pull request:
https://github.com/apache/drill/pull/877#discussion_r132533745
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/MetadataVersion.java
---
@@ -0,0 +1,156 @@
+/*
+ * 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
+ * <p/>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p/>
+ * 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.drill.exec.store.parquet;
+
+import com.google.common.base.Preconditions;
+import com.google.common.collect.ComparisonChain;
+import com.google.common.collect.ImmutableSortedSet;
+import org.apache.drill.common.exceptions.DrillRuntimeException;
+
+import java.util.SortedSet;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+
+public class MetadataVersion implements Comparable<MetadataVersion> {
+
+ private static final String FORMAT = "v?((?!0)\\d+)(\\.(\\d+))?";
+ private static final Pattern PATTERN = Pattern.compile(FORMAT);
+
+ private final int major;
+ private final int minor;
+
+ public MetadataVersion(int major, int minor) {
+ this.major = major;
+ this.minor = minor;
+ }
+
+ public MetadataVersion(String metadataVersion) {
+ Matcher matcher = PATTERN.matcher(metadataVersion);
+ if (!matcher.matches()) {
+ DrillRuntimeException.format("Could not parse metadata version '%s'
using format '%s'", metadataVersion, FORMAT);
+ }
+ this.major = Integer.parseInt(matcher.group(1));
+ this.minor = matcher.group(3) != null ?
Integer.parseInt(matcher.group(3)) : 0;
+ }
+
+ public int getMajor() {
+ return major;
+ }
+
+ public int getMinor() {
+ return minor;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) {
+ return true;
+ }
+ if (!(o instanceof MetadataVersion)) {
+ return false;
+ }
+ MetadataVersion that = (MetadataVersion) o;
+ return this.major == that.major
+ && this.minor == that.minor;
+ }
+
+ @Override
+ public int hashCode() {
+ int result = major;
+ result = 31 * result + minor;
+ return result;
+ }
+
+ /**
+ * @return string representation of the metadata file version, for
example: "v1", "v10", "v4.13"
+ * <p>
+ * String metadata version consists of the following characters:<p>
+ * optional "v" letter,<p>
--- End diff --
Done
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