WebMessageAdapter.java
/*
* Copyright 2018 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 androidx.webkit.WebMessagePortCompat;
import org.chromium.support_lib_boundary.WebMessageBoundaryInterface;
import java.lang.reflect.InvocationHandler;
/**
* Adapter between {@link WebMessageCompat} and
* {@link org.chromium.support_lib_boundary.WebMessageBoundaryInterface}.
* This class is used to pass a PostMessage from the app to Chromium.
*/
public class WebMessageAdapter implements WebMessageBoundaryInterface {
private WebMessageCompat mWebMessageCompat;
public WebMessageAdapter(@NonNull WebMessageCompat webMessage) {
this.mWebMessageCompat = webMessage;
}
@Override
@Nullable
public String getData() {
return mWebMessageCompat.getData();
}
@Override
@Nullable
public InvocationHandler[] getPorts() {
WebMessagePortCompat[] ports = mWebMessageCompat.getPorts();
if (ports == null) return null;
InvocationHandler[] invocationHandlers = new InvocationHandler[ports.length];
for (int n = 0; n < ports.length; n++) {
invocationHandlers[n] = ports[n].getInvocationHandler();
}
return invocationHandlers;
}
@Override
@NonNull
public String[] getSupportedFeatures() {
// getData() and getPorts() are not covered by feature flags.
return new String[0];
}
// ====================================================================================
// Methods related to converting a WebMessageBoundaryInterface into a WebMessageCompat.
// ====================================================================================
/**
* Utility method used to convert PostMessages from the Chromium side to
* {@link WebMessageCompat} objects - a class apps recognize.
*/
@NonNull
public static WebMessageCompat webMessageCompatFromBoundaryInterface(
@NonNull WebMessageBoundaryInterface boundaryInterface) {
return new WebMessageCompat(boundaryInterface.getData(),
toWebMessagePortCompats(boundaryInterface.getPorts()));
}
@NonNull
private static WebMessagePortCompat[] toWebMessagePortCompats(InvocationHandler[] ports) {
WebMessagePortCompat[] compatPorts = new WebMessagePortCompat[ports.length];
for (int n = 0; n < ports.length; n++) {
compatPorts[n] = new WebMessagePortImpl(ports[n]);
}
return compatPorts;
}
}