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/*
* Copyright (C) 2012 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.view;
import android.util.LongSparseArray;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;
/**
* Simple cache for AccessibilityNodeInfos. The cache is mapping an
* accessibility id to an info. The cache allows storing of
* <code>null</code> values. It also tracks accessibility events
* and invalidates accordingly.
*
* @hide
*/
public class AccessibilityNodeInfoCache {
private final boolean ENABLED = true;
/**
* @return A new <strong>not synchronized</strong> AccessibilityNodeInfoCache.
*/
public static AccessibilityNodeInfoCache newAccessibilityNodeInfoCache() {
return new AccessibilityNodeInfoCache();
}
/**
* @return A new <strong>synchronized</strong> AccessibilityNodeInfoCache.
*/
public static AccessibilityNodeInfoCache newSynchronizedAccessibilityNodeInfoCache() {
return new AccessibilityNodeInfoCache() {
private final Object mLock = new Object();
@Override
public void clear() {
synchronized(mLock) {
super.clear();
}
}
@Override
public AccessibilityNodeInfo get(long accessibilityNodeId) {
synchronized(mLock) {
return super.get(accessibilityNodeId);
}
}
@Override
public void put(long accessibilityNodeId, AccessibilityNodeInfo info) {
synchronized(mLock) {
super.put(accessibilityNodeId, info);
}
}
@Override
public void remove(long accessibilityNodeId) {
synchronized(mLock) {
super.remove(accessibilityNodeId);
}
}
};
}
private final LongSparseArray<AccessibilityNodeInfo> mCacheImpl;
private AccessibilityNodeInfoCache() {
if (ENABLED) {
mCacheImpl = new LongSparseArray<AccessibilityNodeInfo>();
} else {
mCacheImpl = null;
}
}
/**
* The cache keeps track of {@link AccessibilityEvent}s and invalidates
* cached nodes as appropriate.
*
* @param event An event.
*/
public void onAccessibilityEvent(AccessibilityEvent event) {
final int eventType = event.getEventType();
switch (eventType) {
case AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED:
case AccessibilityEvent.TYPE_VIEW_SCROLLED:
clear();
break;
case AccessibilityEvent.TYPE_VIEW_FOCUSED:
case AccessibilityEvent.TYPE_VIEW_SELECTED:
case AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED:
case AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED:
final long accessibilityNodeId = event.getSourceNodeId();
remove(accessibilityNodeId);
break;
}
}
/**
* Gets a cached {@link AccessibilityNodeInfo} given its accessibility node id.
*
* @param accessibilityNodeId The info accessibility node id.
* @return The cached {@link AccessibilityNodeInfo} or null if such not found.
*/
public AccessibilityNodeInfo get(long accessibilityNodeId) {
if (ENABLED) {
return mCacheImpl.get(accessibilityNodeId);
} else {
return null;
}
}
/**
* Caches an {@link AccessibilityNodeInfo} given its accessibility node id.
*
* @param accessibilityNodeId The info accessibility node id.
* @param info The {@link AccessibilityNodeInfo} to cache.
*/
public void put(long accessibilityNodeId, AccessibilityNodeInfo info) {
if (ENABLED) {
mCacheImpl.put(accessibilityNodeId, info);
}
}
/**
* Returns whether the cache contains an accessibility node id key.
*
* @param accessibilityNodeId The key for which to check.
* @return True if the key is in the cache.
*/
public boolean containsKey(long accessibilityNodeId) {
if (ENABLED) {
return (mCacheImpl.indexOfKey(accessibilityNodeId) >= 0);
} else {
return false;
}
}
/**
* Removes a cached {@link AccessibilityNodeInfo}.
*
* @param accessibilityNodeId The info accessibility node id.
*/
public void remove(long accessibilityNodeId) {
if (ENABLED) {
mCacheImpl.remove(accessibilityNodeId);
}
}
/**
* Clears the cache.
*/
public void clear() {
if (ENABLED) {
mCacheImpl.clear();
}
}
}
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