WebMessagePayloadAdapter.java
/*
* Copyright 2022 The Android Open Source Project
*
* 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 androidx.webkit.internal;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.webkit.WebMessageCompat;
import org.chromium.support_lib_boundary.WebMessagePayloadBoundaryInterface;
import java.util.Objects;
/**
* Adapter between {@link WebMessageCompat} and {@link WebMessagePayloadBoundaryInterface}.
* This class is used to pass **payload** of a WebMessageCompat to Chromium.
*/
public class WebMessagePayloadAdapter implements WebMessagePayloadBoundaryInterface {
private final @WebMessagePayloadType int mType;
private final @Nullable String mString;
private final @Nullable byte[] mArrayBuffer;
public WebMessagePayloadAdapter(@Nullable final String data) {
mType = WebMessageCompat.TYPE_STRING;
mString = data;
mArrayBuffer = null;
}
public WebMessagePayloadAdapter(@NonNull final byte[] arrayBuffer) {
mType = WebMessageCompat.TYPE_ARRAY_BUFFER;
mString = null;
mArrayBuffer = arrayBuffer;
}
@Override
@NonNull
public String[] getSupportedFeatures() {
// getType, getAsString and getAsArrayBuffer are covered by
// WEB_MESSAGE_ARRAY_BUFFER.
return new String[0];
}
@Override
public int getType() {
return mType;
}
@Nullable
@Override
public String getAsString() {
checkType(WebMessagePayloadType.TYPE_STRING);
return mString;
}
@NonNull
@Override
public byte[] getAsArrayBuffer() {
checkType(WebMessagePayloadType.TYPE_ARRAY_BUFFER);
return Objects.requireNonNull(mArrayBuffer);
}
/**
* Check if current message payload type is the {@code expectedType}.
*/
private void checkType(@WebMessagePayloadType int expectedType) {
if (mType != expectedType) {
throw new IllegalStateException("Expected " + expectedType + ", but type is " + mType);
}
}
}