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/*
* Copyright (C) 2011 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.bookmarkprovider.tests.utils;
import android.database.ContentObserver;
import android.net.Uri;
import java.util.ArrayList;
public final class MockObserverNode {
private class MockObserverEntry {
public final ContentObserver observer;
public final boolean notifyForDescendents;
public MockObserverEntry(ContentObserver o, boolean n) {
observer = o;
notifyForDescendents = n;
}
}
public static final int INSERT_TYPE = 0;
public static final int UPDATE_TYPE = 1;
public static final int DELETE_TYPE = 2;
private String mName;
private ArrayList<MockObserverNode> mChildren = new ArrayList<MockObserverNode>();
private ArrayList<MockObserverEntry> mObservers = new ArrayList<MockObserverEntry>();
public MockObserverNode(String name) {
mName = name;
}
private String getUriSegment(Uri uri, int index) {
if (uri != null) {
if (index == 0) {
return uri.getAuthority();
} else {
return uri.getPathSegments().get(index - 1);
}
} else {
return null;
}
}
private int countUriSegments(Uri uri) {
if (uri == null) {
return 0;
}
return uri.getPathSegments().size() + 1;
}
public void addObserver(Uri uri, ContentObserver observer,
boolean notifyForDescendents) {
addObserver(uri, 0, observer, notifyForDescendents);
}
private void addObserver(Uri uri, int index, ContentObserver observer,
boolean notifyForDescendents) {
// If this is the leaf node add the observer
if (index == countUriSegments(uri)) {
mObservers.add(new MockObserverEntry(observer, notifyForDescendents));
return;
}
// Look to see if the proper child already exists
String segment = getUriSegment(uri, index);
if (segment == null) {
throw new IllegalArgumentException("Invalid Uri (" + uri + ") used for observer");
}
int N = mChildren.size();
for (int i = 0; i < N; i++) {
MockObserverNode node = mChildren.get(i);
if (node.mName.equals(segment)) {
node.addObserver(uri, index + 1, observer, notifyForDescendents);
return;
}
}
// No child found, create one
MockObserverNode node = new MockObserverNode(segment);
mChildren.add(node);
node.addObserver(uri, index + 1, observer, notifyForDescendents);
}
public boolean removeObserver(ContentObserver observer) {
int size = mChildren.size();
for (int i = 0; i < size; i++) {
boolean empty = mChildren.get(i).removeObserver(observer);
if (empty) {
mChildren.remove(i);
i--;
size--;
}
}
size = mObservers.size();
for (int i = 0; i < size; i++) {
MockObserverEntry entry = mObservers.get(i);
if (entry.observer == observer) {
mObservers.remove(i);
break;
}
}
if (mChildren.size() == 0 && mObservers.size() == 0) {
return true;
}
return false;
}
private void notifyMyObservers(boolean leaf, ContentObserver observer,
boolean selfNotify) {
int N = mObservers.size();
for (int i = 0; i < N; i++) {
MockObserverEntry entry = mObservers.get(i);
// Don't notify the observer if it sent the notification and isn't interesed
// in self notifications
if (entry.observer == observer && !selfNotify) {
continue;
}
// Make sure the observer is interested in the notification
if (leaf || (!leaf && entry.notifyForDescendents)) {
entry.observer.onChange(selfNotify);
}
}
}
public void notifyMyObservers(Uri uri, int index, ContentObserver observer,
boolean selfNotify) {
String segment = null;
int segmentCount = countUriSegments(uri);
if (index >= segmentCount) {
// This is the leaf node, notify all observers
notifyMyObservers(true, observer, selfNotify);
} else if (index < segmentCount){
segment = getUriSegment(uri, index);
// Notify any observers at this level who are interested in descendents
notifyMyObservers(false, observer, selfNotify);
}
int N = mChildren.size();
for (int i = 0; i < N; i++) {
MockObserverNode node = mChildren.get(i);
if (segment == null || node.mName.equals(segment)) {
// We found the child,
node.notifyMyObservers(uri, index + 1, observer, selfNotify);
if (segment != null) {
break;
}
}
}
}
}
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