Introduce InputMethodServiceInternal for better abstraction

This is a mechanical refactoring CL that has no behavior change.

This CL removes the direct dependency on AbstractInputMethodService
from whenever possible.  As a result, the following classes no longer
directly depend on AbstractInputMethodService.

 * android.inputmethodservice.IInputMethodWrapper
 * android.inputmethodservice.RemoteInputConnection
 * com.android.internal.inputmethod.ImeTracing
 * com.android.internal.inputmethod.ImeTracingClientImpl
 * com.android.internal.inputmethod.ImeTracingServerImpl

This is still a purely mechanical refactoring.  There should be no
observable behavior change.

Bug: 192412909
Test: atest CtsInputMethodTestCases
Test: Manually verified that IME tracing still works
Change-Id: I2aeeeacd27195ce10059d6590e098a4a969e774d

1 files changed, 86 insertions, 0 deletions

diff --git a/core/java/android/inputmethodservice/InputMethodServiceInternal.java b/core/java/android/inputmethodservice/InputMethodServiceInternal.java
new file mode 100644
index 000000000000..7cd4ff61b2c8
--- /dev/null
+++ b/core/java/android/inputmethodservice/InputMethodServiceInternal.java
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2021 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 android.inputmethodservice;
+
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.content.Context;
+import android.os.Bundle;
+import android.view.inputmethod.InputConnection;
+import android.view.inputmethod.InputContentInfo;
+
+import java.io.FileDescriptor;
+import java.io.PrintWriter;
+
+/**
+ * A set of internal methods exposed by {@link InputMethodService} to be called only from other
+ * framework classes for internal use.
+ *
+ * <p>CAVEATS: {@link AbstractInputMethodService} does not support all the methods here.</p>
+ */
+interface InputMethodServiceInternal {
+    /**
+     * @return {@link Context} associated with the service.
+     */
+    @NonNull
+    Context getContext();
+
+    /**
+     * Allow the receiver of {@link InputContentInfo} to obtain a temporary read-only access
+     * permission to the content.
+     *
+     * @param inputContentInfo Content to be temporarily exposed from the input method to the
+     *                         application. This cannot be {@code null}.
+     * @param inputConnection {@link InputConnection} with which
+     *                        {@link InputConnection#commitContent(InputContentInfo, int, Bundle)}
+     *                        will be called.
+     */
+    default void exposeContent(@NonNull InputContentInfo inputContentInfo,
+            @NonNull InputConnection inputConnection) {
+    }
+
+    /**
+     * Called when the user took some actions that should be taken into consideration to update the
+     * MRU list for input method rotation.
+     */
+    default void notifyUserActionIfNecessary() {
+    }
+
+    /**
+     * Called when the system is asking the IME to dump its information for debugging.
+     *
+     * <p>The caller is responsible for checking {@link android.Manifest.permission.DUMP}.</p>
+     *
+     * @param fd The raw file descriptor that the dump is being sent to.
+     * @param fout The file to which you should dump your state.  This will be
+     * closed for you after you return.
+     * @param args additional arguments to the dump request.
+     */
+    default void dump(FileDescriptor fd, PrintWriter fout, String[] args) {
+    }
+
+    /**
+     * Called with {@link com.android.internal.inputmethod.ImeTracing#triggerServiceDump(String,
+     * com.android.internal.inputmethod.ImeTracing.ServiceDumper, byte[])} needs to be triggered
+     * with the given parameters.
+     *
+     * @param where {@code where} parameter to be passed.
+     * @param icProto {@code icProto} parameter to be passed.
+     */
+    default void triggerServiceDump(String where, @Nullable byte[] icProto) {
+    }
+}