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/*
* Copyright (C) 2008 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.webkit;
import android.webkit.CacheManager.CacheResult;
import android.webkit.UrlInterceptHandler;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Map;
public final class UrlInterceptRegistry {
private final static String LOGTAG = "intercept";
private static boolean mDisabled = false;
private static LinkedList mHandlerList;
private static synchronized LinkedList getHandlers() {
if(mHandlerList == null)
mHandlerList = new LinkedList<UrlInterceptHandler>();
return mHandlerList;
}
/**
* set the flag to control whether url intercept is enabled or disabled
*
* @param disabled true to disable the cache
*/
public static synchronized void setUrlInterceptDisabled(boolean disabled) {
mDisabled = disabled;
}
/**
* get the state of the url intercept, enabled or disabled
*
* @return return if it is disabled
*/
public static synchronized boolean urlInterceptDisabled() {
return mDisabled;
}
/**
* Register a new UrlInterceptHandler. This handler will be called
* before any that were previously registered.
*
* @param handler The new UrlInterceptHandler object
* @return true if the handler was not previously registered.
*/
public static synchronized boolean registerHandler(
UrlInterceptHandler handler) {
if (!getHandlers().contains(handler)) {
getHandlers().addFirst(handler);
return true;
} else {
return false;
}
}
/**
* Unregister a previously registered UrlInterceptHandler.
*
* @param handler A previously registered UrlInterceptHandler.
* @return true if the handler was found and removed from the list.
*/
public static synchronized boolean unregisterHandler(
UrlInterceptHandler handler) {
return getHandlers().remove(handler);
}
/**
* Given an url, returns the CacheResult of the first
* UrlInterceptHandler interested, or null if none are.
*
* @return A CacheResult containing surrogate content.
*/
public static synchronized CacheResult getSurrogate(
String url, Map<String, String> headers) {
if (urlInterceptDisabled())
return null;
Iterator iter = getHandlers().listIterator();
while (iter.hasNext()) {
UrlInterceptHandler handler = (UrlInterceptHandler) iter.next();
CacheResult result = handler.service(url, headers);
if (result != null) {
return result;
}
}
return null;
}
}
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