okhttp3.internal.io.InMemoryFileSystem Maven / Gradle / Ivy
/*
* Copyright (C) 2015 Square, 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 okhttp3.internal.io;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import okio.Buffer;
import okio.ForwardingSink;
import okio.ForwardingSource;
import okio.Sink;
import okio.Source;
import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;
/** A simple file system where all files are held in memory. Not safe for concurrent use. */
public final class InMemoryFileSystem implements FileSystem, TestRule {
private final Map files = new LinkedHashMap<>();
private final Map openSources = new IdentityHashMap<>();
private final Map openSinks = new IdentityHashMap<>();
@Override public Statement apply(final Statement base, Description description) {
return new Statement() {
@Override public void evaluate() throws Throwable {
base.evaluate();
ensureResourcesClosed();
}
};
}
public void ensureResourcesClosed() {
List openResources = new ArrayList<>();
for (File file : openSources.values()) {
openResources.add("Source for " + file);
}
for (File file : openSinks.values()) {
openResources.add("Sink for " + file);
}
if (!openResources.isEmpty()) {
StringBuilder builder = new StringBuilder("Resources acquired but not closed:");
for (String resource : openResources) {
builder.append("\n * ").append(resource);
}
throw new IllegalStateException(builder.toString());
}
}
@Override public Source source(File file) throws FileNotFoundException {
Buffer result = files.get(file);
if (result == null) throw new FileNotFoundException();
final Source source = result.clone();
openSources.put(source, file);
return new ForwardingSource(source) {
@Override public void close() throws IOException {
openSources.remove(source);
super.close();
}
};
}
@Override public Sink sink(File file) throws FileNotFoundException {
return sink(file, false);
}
@Override public Sink appendingSink(File file) throws FileNotFoundException {
return sink(file, true);
}
private Sink sink(File file, boolean appending) {
Buffer result = null;
if (appending) {
result = files.get(file);
}
if (result == null) {
result = new Buffer();
}
files.put(file, result);
final Sink sink = result;
openSinks.put(sink, file);
return new ForwardingSink(sink) {
@Override public void close() throws IOException {
openSinks.remove(sink);
super.close();
}
};
}
@Override public void delete(File file) throws IOException {
files.remove(file);
}
@Override public boolean exists(File file) {
return files.containsKey(file);
}
@Override public long size(File file) {
Buffer buffer = files.get(file);
return buffer != null ? buffer.size() : 0L;
}
@Override public void rename(File from, File to) throws IOException {
Buffer buffer = files.remove(from);
if (buffer == null) throw new FileNotFoundException();
files.put(to, buffer);
}
@Override public void deleteContents(File directory) throws IOException {
String prefix = directory.toString() + "/";
for (Iterator i = files.keySet().iterator(); i.hasNext(); ) {
File file = i.next();
if (file.toString().startsWith(prefix)) i.remove();
}
}
}