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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.backends;
import android.net.Uri;
import android.text.TextUtils;
import com.google.android.libraries.mobiledatadownload.file.common.MalformedUriException;
import com.google.android.libraries.mobiledatadownload.file.common.internal.LiteTransformFragments;
import com.google.android.libraries.mobiledatadownload.file.transforms.TransformProtos;
import com.google.common.collect.ImmutableList;
import com.google.mobiledatadownload.TransformProto;
/**
* Helper class for "memory" scheme Uris. The scheme is opaque, with the opaque part simply used as
* a key to identify the file; it is non-hierarchical.
*/
public final class MemoryUri {
/** Returns an empty "memory" scheme Uri builder. */
public static Builder builder() {
return new Builder();
}
private MemoryUri() {}
/** A builder for "memory" scheme Uris. */
public static final class Builder {
private String key = "";
private final ImmutableList.Builder<String> encodedSpecs = ImmutableList.builder();
private Builder() {}
/** Sets the non-empty key to be used as a file identifier. */
public Builder setKey(String key) {
this.key = key;
return this;
}
/**
* Appends a transform to the Uri. Calling twice with the same transform replaces the original.
*/
public Builder withTransform(TransformProto.Transform spec) {
encodedSpecs.add(TransformProtos.toEncodedSpec(spec));
return this;
}
public Uri build() throws MalformedUriException {
if (TextUtils.isEmpty(key)) {
throw new MalformedUriException("Key must be non-empty");
}
String fragment = LiteTransformFragments.joinTransformSpecs(encodedSpecs.build());
return new Uri.Builder()
.scheme(MemoryBackend.URI_SCHEME)
.opaquePart(key)
.encodedFragment(fragment)
.build();
}
}
}
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