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/*
* Copyright (C) 2014 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.server.telecom;
import android.util.ArrayMap;
import java.util.Map;
/** Utility to map {@link Call} objects to unique IDs. IDs are generated when a call is added. */
class CallIdMapper {
/**
* A very basic bidirectional map.
*/
static class BiMap<K, V> {
private Map<K, V> mPrimaryMap = new ArrayMap<>();
private Map<V, K> mSecondaryMap = new ArrayMap<>();
public boolean put(K key, V value) {
if (key == null || value == null || mPrimaryMap.containsKey(key) ||
mSecondaryMap.containsKey(value)) {
return false;
}
mPrimaryMap.put(key, value);
mSecondaryMap.put(value, key);
return true;
}
public boolean remove(K key) {
if (key == null) {
return false;
}
if (mPrimaryMap.containsKey(key)) {
V value = getValue(key);
mPrimaryMap.remove(key);
mSecondaryMap.remove(value);
return true;
}
return false;
}
public boolean removeValue(V value) {
if (value == null) {
return false;
}
return remove(getKey(value));
}
public V getValue(K key) {
return mPrimaryMap.get(key);
}
public K getKey(V value) {
return mSecondaryMap.get(value);
}
public void clear() {
mPrimaryMap.clear();
mSecondaryMap.clear();
}
}
private final BiMap<String, Call> mCalls = new BiMap<>();
private final String mCallIdPrefix;
private static int sIdCount;
CallIdMapper(String callIdPrefix) {
mCallIdPrefix = callIdPrefix + "@";
}
void replaceCall(Call newCall, Call callToReplace) {
// Use the old call's ID for the new call.
String callId = getCallId(callToReplace);
mCalls.put(callId, newCall);
}
void addCall(Call call, String id) {
if (call == null) {
return;
}
mCalls.put(id, call);
}
void addCall(Call call) {
addCall(call, getNewId());
}
void removeCall(Call call) {
if (call == null) {
return;
}
mCalls.removeValue(call);
}
void removeCall(String callId) {
mCalls.remove(callId);
}
String getCallId(Call call) {
if (call == null) {
return null;
}
return mCalls.getKey(call);
}
Call getCall(Object objId) {
String callId = null;
if (objId instanceof String) {
callId = (String) objId;
}
if (!isValidCallId(callId) && !isValidConferenceId(callId)) {
return null;
}
return mCalls.getValue(callId);
}
void clear() {
mCalls.clear();
}
boolean isValidCallId(String callId) {
// Note, no need for thread check, this method is thread safe.
return callId != null && callId.startsWith(mCallIdPrefix);
}
boolean isValidConferenceId(String callId) {
return callId != null;
}
String getNewId() {
sIdCount++;
return mCallIdPrefix + sIdCount;
}
}
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