Added network request evaluation result (3418212e) · Commits · e / os / android_frameworks_opt_telephony

src/java/com/android/internal/telephony/data/DataEvaluationResult.java

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+221 −0

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		/*
		* 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 com.android.internal.telephony.data;

		import android.annotation.CurrentTimeMillisLong;
		import android.annotation.NonNull;

		import java.text.DateFormat;
		import java.util.HashSet;
		import java.util.Set;

		/**
		* The class to describe the result of environment evaluation for whether allowing or disallowing
		* establishing a data network.
		*/
		public class DataEvaluationResult {
		/** Data disallowed reasons. There could be multiple reasons for not allowing data. */
		private @NonNull Set<DataDisallowedReason> mDataDisallowedReasons = new HashSet<>();

		/** Data allowed reason. It is intended to only have one allowed reason. */
		private DataAllowedReason mDataAllowedReason = DataAllowedReason.NONE;

		/** The timestamp of evaluation time */
		private @CurrentTimeMillisLong long mEvaluatedTime = 0;

		/**
		* Add a data disallowed reason. Note that adding a disallowed reason will clean up the
		* allowed reason because they are mutual exclusive.
		*
		* @param reason Disallowed reason.
		*/
		public void add(DataDisallowedReason reason) {
		mDataAllowedReason = DataAllowedReason.NONE;
		mDataDisallowedReasons.add(reason);
		mEvaluatedTime = System.currentTimeMillis();
		}

		/**
		* Add a data allowed reason. Note that adding an allowed reason will clean up the disallowed
		* reasons because they are mutual exclusive.
		*
		* @param reason Allowed reason.
		*/
		public void add(DataAllowedReason reason) {
		mDataDisallowedReasons.clear();

		// Only higher priority allowed reason can overwrite the old one. See
		// DataAllowedReason for the oder.
		if (reason.ordinal() > mDataAllowedReason.ordinal()) {
		mDataAllowedReason = reason;
		}
		mEvaluatedTime = System.currentTimeMillis();
		}

		@Override
		public String toString() {
		StringBuilder reasonStr = new StringBuilder();
		reasonStr.append("EvaluationResult: ");
		if (mDataDisallowedReasons.size() > 0) {
		reasonStr.append("Data disallowed reasons:");
		for (DataDisallowedReason reason : mDataDisallowedReasons) {
		reasonStr.append(" ").append(reason);
		}
		} else {
		reasonStr.append("Data allowed reason:");
		reasonStr.append(" ").append(mDataAllowedReason);
		}
		reasonStr.append(", time=" + DateFormat.getDateTimeInstance().format(mEvaluatedTime));
		return reasonStr.toString();
		}

		/**
		* @return {@code true} if data is allowed.
		*/
		public boolean isDataAllowed() {
		return mDataDisallowedReasons.size() == 0;
		}

		/**
		* Check if it contains a certain disallowed reason.
		*
		* @param reason The disallowed reason to check.
		* @return {@code true} if the provided reason matches one of the disallowed reasons.
		*/
		public boolean contains(DataDisallowedReason reason) {
		return mDataDisallowedReasons.contains(reason);
		}

		/**
		* Check if only one disallowed reason prevent data connection.
		*
		* @param reason The given reason to check
		* @return True if the given reason is the only one that prevents data connection
		*/
		public boolean containsOnly(DataDisallowedReason reason) {
		return mDataDisallowedReasons.size() == 1 && contains(reason);
		}

		/**
		* Check if the allowed reason is the specified reason.
		*
		* @param reason The allowed reason.
		* @return {@code true} if the specified reason matches the allowed reason.
		*/
		public boolean contains(DataAllowedReason reason) {
		return reason == mDataAllowedReason;
		}

		/**
		* @return {@code true} if the disallowed reasons contains hard reasons.
		*/
		public boolean containsHardDisallowedReasons() {
		for (DataDisallowedReason reason : mDataDisallowedReasons) {
		if (reason.isHardReason()) {
		return true;
		}
		}
		return false;
		}

		/** Disallowed reasons. There could be multiple reasons if data connection is not allowed. */
		public enum DataDisallowedReason {
		// Soft failure reasons. A soft reason means that in certain conditions, data is still
		// allowed. Normally those reasons are due to users settings.

		/** Data is disabled by the user or policy. */
		DATA_DISABLED(false),
		/** Data roaming is disabled by the user. */
		ROAMING_DISABLED(false),
		/** Default data not selected. */
		DEFAULT_DATA_UNSELECTED(false),

		// Belows are all hard failure reasons. A hard reason means no matter what the data should
		// not be allowed.
		/** Data registration state is not in service. */
		NOT_IN_SERVICE(true),
		/** SIM is not ready. */
		SIM_NOT_READY(true),
		/** Concurrent voice and data is not allowed. */
		CONCURRENT_VOICE_DATA_NOT_ALLOWED(true),
		/** Carrier notified data should be restricted. */
		DATA_RESTRICTED_BY_NETWORK(true),
		/** Radio power is off (i.e. airplane mode on) */
		RADIO_POWER_OFF(true),
		/** Data disabled by telephony in some scenarios, for example, emergency call. */
		INTERNAL_DATA_DISABLED(true),
		/** Airplane mode is forcibly turned on by the carrier. */
		RADIO_DISABLED_BY_CARRIER(true),
		/** certain APNs are only allowed when the device is camped on NR. */
		NOT_ON_NR(true),
		/** Data is not allowed while device is in emergency callback mode. */
		IN_ECBM(true),
		/** Underlying data service is not bound. */
		DATA_SERVICE_NOT_READY(true);

		private final boolean mIsHardReason;

		/**
		* @return {@code true} if the disallowed reason is a hard reason.
		*/
		public boolean isHardReason() {
		return mIsHardReason;
		}

		/**
		* Constructor
		*
		* @param isHardReason {@code true} if the disallowed reason is a hard reason. A hard reason
		* means no matter what the data should not be allowed. A soft reason means that in certain
		* conditions, data is still allowed.
		*/
		DataDisallowedReason(boolean isHardReason) {
		mIsHardReason = isHardReason;
		}
		}

		/**
		* Data allowed reasons. There will be only one reason if data is allowed.
		*/
		enum DataAllowedReason {
		// Note that unlike disallowed reasons, we only have one allowed reason every time
		// when we check data is allowed or not. The order of these allowed reasons is very
		// important. The lower ones take precedence over the upper ones.
		/**
		* None. This is the initial value.
		*/
		NONE,
		/**
		* The normal reason. This is the most common case.
		*/
		NORMAL,
		/**
		* The network brought up by this network request is unmetered. Should allowed no matter
		* the user enables or disables data.
		*/
		UNMETERED_USAGE,
		/**
		* The network request is restricted (i.e. Only privilege apps can access the network.)
		*/
		RESTRICTED_REQUEST,
		/**
		* Data is allowed because the network request is for emergency. This should be always at
		* the bottom (i.e. highest priority)
		*/
		EMERGENCY_REQUEST,
		}
		}