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/*
* Copyright 2022 Google LLC
*
* 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.android.libraries.mobiledatadownload.file.samples;
import android.net.Uri;
import com.google.android.libraries.mobiledatadownload.file.common.Sizable;
import com.google.android.libraries.mobiledatadownload.file.spi.Transform;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* This is a toy transform that is useful to illustrate that the invocation order is correct when
* combined with a base64 transform.
*/
public final class CapitalizationTransform implements Transform {
@Override
public String name() {
return "capitalize";
}
@Override
public InputStream wrapForRead(Uri uri, InputStream wrapped) {
return new CapitalizationInputStream(wrapped);
}
@SuppressWarnings("InputStreamSlowMultibyteRead")
// NOTE: Not bothering to override read(byte[],int,int) b/c this transform
// is never intended to be used for anything besides an example.
private static class CapitalizationInputStream extends InputStream implements Sizable {
private final InputStream in;
private CapitalizationInputStream(InputStream in) {
this.in = in;
}
@Override
public int read() throws IOException {
int b = in.read();
if (b == -1) {
return b;
}
return Character.toString((char) b).toUpperCase().charAt(0);
}
@Override
public Long size() throws IOException {
if (!(in instanceof Sizable)) {
return null;
}
return ((Sizable) in).size();
}
}
@Override
public OutputStream wrapForWrite(Uri uri, OutputStream wrapped) {
OutputStream stream =
new OutputStream() {
@Override
public void write(int b) throws IOException {
wrapped.write(Character.toString((char) b).toLowerCase().charAt(0));
}
@Override
public void close() throws IOException {
wrapped.close();
}
};
return stream;
}
@Override
public OutputStream wrapForAppend(Uri uri, OutputStream wrapped) throws IOException {
return wrapForWrite(uri, wrapped);
}
@Override
public String encode(Uri uri, String filename) {
return filename.toLowerCase();
}
@Override
public String decode(Uri uri, String filename) {
return filename.toUpperCase();
}
}
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