com.fizzed.bigmap.impl.BigMapHelper Maven / Gradle / Ivy
/*
* Copyright 2019 Fizzed, 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 com.fizzed.bigmap.impl;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.*;
import java.util.Map.Entry;
import java.util.stream.Stream;
import static java.util.stream.Collectors.toList;
public class BigMapHelper {
static public List toKeyList(Map map) {
return map.keySet().stream().collect(toList());
}
static public List toValueList(Map,V> map) {
return map.values().stream().collect(toList());
}
static public List toIteratedList(Iterator it, int count) {
List items = new ArrayList<>();
for (int i = 0; i < count; i++) {
items.add(it.next());
}
return items;
}
static public List toIteratedKeyList(Iterator> it, int count) {
List items = new ArrayList<>();
for (int i = 0; i < count; i++) {
items.add(it.next().getKey());
}
return items;
}
static public long sizeOf(byte[] b) {
return b != null ? b.length : 0;
}
static public void recursivelyDelete(Path directoryOrFile) {
if (directoryOrFile == null) {
return;
}
try {
if (Files.exists(directoryOrFile)) {
// if just a normal file, delete it
if (Files.isRegularFile(directoryOrFile)) {
Files.delete(directoryOrFile);
return;
}
// otherwise, its a directory and we need to recursively walk it
try (Stream files = Files.list(directoryOrFile)) {
files.forEach(file -> {
try {
Files.delete(file);
} catch (IOException e) {
throw new UncheckedIOException(e);
}
});
} catch (Exception e) {
throw new RuntimeException("Unable to delete existing database file!", e);
}
// now cleanup the directory too
try {
Files.delete(directoryOrFile);
} catch (IOException e) {
throw new UncheckedIOException("Unable to delete existing database file!", e);
}
}
} catch (IOException e) {
throw new UncheckedIOException("Unable to list existing database directory!", e);
}
}
static public Path resolveTempDirectory() {
return Paths.get(System.getProperty("java.io.tmpdir"));
}
static public Path resolveScratchDirectory(Path scratchDirectory, boolean persistent, UUID id, String nonPersistentPrefixName) {
Objects.requireNonNull(id, "id was null");
final Path resolvedScratchDir = scratchDirectory != null ? scratchDirectory : Paths.get(".");
Path directory = resolvedScratchDir;
if (!persistent) {
String nonPersistentName = id.toString();
if (nonPersistentPrefixName != null) {
nonPersistentName = nonPersistentPrefixName + "-" + nonPersistentName;
}
directory = resolvedScratchDir.resolve(nonPersistentName);
}
return directory;
}
}
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