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// Copyright 2015 Google Inc. All rights reserved.
//
// 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.google.devtools.build.singlejar;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;
import java.util.HashMap;
import java.util.Map;
/**
* FileSystem for testing. FileSystem supports exactly one one OutputStream for filename
* specified in constructor.
* Workflow for using this class in tests are following:
* <ul>
* <li> Construct with exactly one outputFile. </li>
* <li> add some input files using method addFile </li>
* <li> check content of outputFile calling toByteArray </li>
* </ul>
*/
public final class MockSimpleFileSystem implements SimpleFileSystem {
private final String outputFileName;
private ByteArrayOutputStream out;
private final Map<String, byte[]> files = new HashMap<>();
public MockSimpleFileSystem(String outputFileName) {
this.outputFileName = outputFileName;
}
public void addFile(String name, byte[] content) {
files.put(name, content);
}
public void addFile(String name, String content) {
files.put(name, content.getBytes(UTF_8));
}
@Override
public OutputStream getOutputStream(String filename) {
assertEquals(outputFileName, filename);
assertNull(out);
out = new ByteArrayOutputStream();
return out;
}
@Override
public InputStream getInputStream(String filename) throws IOException {
byte[] data = files.get(filename);
if (data == null) {
throw new FileNotFoundException();
}
return new ByteArrayInputStream(data);
}
@Override
public File getFile(String filename) throws IOException {
byte[] data = files.get(filename);
if (data == null) {
throw new FileNotFoundException();
}
File file = File.createTempFile(filename, null);
Files.copy(new ByteArrayInputStream(data), file.toPath(), StandardCopyOption.REPLACE_EXISTING);
return file;
}
@Override
public boolean delete(String filename) {
assertEquals(outputFileName, filename);
assertNotNull(out);
out = null;
return true;
}
public byte[] toByteArray() {
assertNotNull(out);
return out.toByteArray();
}
}
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