/*
* Copyright (C) 2006 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;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import android.util.Log;
import android.util.LogPrinter;
import android.util.Printer;
import android.util.Config;
import android.content.ContentResolver;
import android.content.Intent;
import android.content.IntentFilter;
/**
* {@hide}
*/
public class IntentResolver<F extends IntentFilter, R extends Object> {
final private static String TAG = "IntentResolver";
final private static boolean DEBUG = false;
final private static boolean localLOGV = DEBUG || Config.LOGV;
public void addFilter(F f) {
if (localLOGV) {
Log.v(TAG, "Adding filter: " + f);
f.dump(new LogPrinter(Log.VERBOSE, TAG), " ");
Log.v(TAG, " Building Lookup Maps:");
}
mFilters.add(f);
int numS = register_intent_filter(f, f.schemesIterator(),
mSchemeToFilter, " Scheme: ");
int numT = register_mime_types(f, " Type: ");
if (numS == 0 && numT == 0) {
register_intent_filter(f, f.actionsIterator(),
mActionToFilter, " Action: ");
}
if (numT != 0) {
register_intent_filter(f, f.actionsIterator(),
mTypedActionToFilter, " TypedAction: ");
}
}
public void removeFilter(F f) {
removeFilterInternal(f);
mFilters.remove(f);
}
void removeFilterInternal(F f) {
if (localLOGV) {
Log.v(TAG, "Removing filter: " + f);
f.dump(new LogPrinter(Log.VERBOSE, TAG), " ");
Log.v(TAG, " Cleaning Lookup Maps:");
}
int numS = unregister_intent_filter(f, f.schemesIterator(),
mSchemeToFilter, " Scheme: ");
int numT = unregister_mime_types(f, " Type: ");
if (numS == 0 && numT == 0) {
unregister_intent_filter(f, f.actionsIterator(),
mActionToFilter, " Action: ");
}
if (numT != 0) {
unregister_intent_filter(f, f.actionsIterator(),
mTypedActionToFilter, " TypedAction: ");
}
}
void dumpMap(Printer out, String prefix, Map<String, ArrayList<F>> map) {
String eprefix = prefix + " ";
String fprefix = prefix + " ";
for (Map.Entry<String, ArrayList<F>> e : map.entrySet()) {
out.println(eprefix + e.getKey() + ":");
ArrayList<F> a = e.getValue();
final int N = a.size();
for (int i=0; i<N; i++) {
dumpFilter(out, fprefix, a.get(i));
}
}
}
public void dump(Printer out, String prefix) {
out.println(prefix + "Full MIME Types:");
dumpMap(out, prefix+" ", mTypeToFilter);
out.println(prefix);
out.println(prefix + "Base MIME Types:");
dumpMap(out, prefix+" ", mBaseTypeToFilter);
out.println(prefix);
out.println(prefix + "Wild MIME Types:");
dumpMap(out, prefix+" ", mWildTypeToFilter);
out.println(prefix);
out.println(prefix + "Schemes:");
dumpMap(out, prefix+" ", mSchemeToFilter);
out.println(prefix);
out.println(prefix + "Non-Data Actions:");
dumpMap(out, prefix+" ", mActionToFilter);
out.println(prefix);
out.println(prefix + "MIME Typed Actions:");
dumpMap(out, prefix+" ", mTypedActionToFilter);
}
private class IteratorWrapper implements Iterator<F> {
private final Iterator<F> mI;
private F mCur;
IteratorWrapper(Iterator<F> it) {
mI = it;
}
public boolean hasNext() {
return mI.hasNext();
}
public F next() {
return (mCur = mI.next());
}
public void remove() {
if (mCur != null) {
removeFilterInternal(mCur);
}
mI.remove();
}
}
/**
* Returns an iterator allowing filters to be removed.
*/
public Iterator<F> filterIterator() {
return new IteratorWrapper(mFilters.iterator());
}
/**
* Returns a read-only set of the filters.
*/
public Set<F> filterSet() {
return Collections.unmodifiableSet(mFilters);
}
public List<R> queryIntent(ContentResolver resolver, Intent intent,
String resolvedType, boolean defaultOnly) {
String scheme = intent.getScheme();
ArrayList<R> finalList = new ArrayList<R>();
final boolean debug = localLOGV ||
((intent.getFlags() & Intent.FLAG_DEBUG_LOG_RESOLUTION) != 0);
if (debug) Log.v(
TAG, "Resolving type " + resolvedType + " scheme " + scheme
+ " of intent " + intent);
ArrayList<F> firstTypeCut = null;
ArrayList<F> secondTypeCut = null;
ArrayList<F> thirdTypeCut = null;
ArrayList<F> schemeCut = null;
// If the intent includes a MIME type, then we want to collect all of
// the filters that match that MIME type.
if (resolvedType != null) {
int slashpos = resolvedType.indexOf('/');
if (slashpos > 0) {
final String baseType = resolvedType.substring(0, slashpos);
if (!baseType.equals("*")) {
if (resolvedType.length() != slashpos+2
|| resolvedType.charAt(slashpos+1) != '*') {
// Not a wild card, so we can just look for all filters that
// completely match or wildcards whose base type matches.
firstTypeCut = mTypeToFilter.get(resolvedType);
if (debug) Log.v(TAG, "First type cut: " + firstTypeCut);
secondTypeCut = mWildTypeToFilter.get(baseType);
if (debug) Log.v(TAG, "Second type cut: " + secondTypeCut);
} else {
// We can match anything with our base type.
firstTypeCut = mBaseTypeToFilter.get(baseType);
if (debug) Log.v(TAG, "First type cut: " + firstTypeCut);
secondTypeCut = mWildTypeToFilter.get(baseType);
if (debug) Log.v(TAG, "Second type cut: " + secondTypeCut);
}
// Any */* types always apply, but we only need to do this
// if the intent type was not already */*.
thirdTypeCut = mWildTypeToFilter.get("*");
if (debug) Log.v(TAG, "Third type cut: " + thirdTypeCut);
} else if (intent.getAction() != null) {
// The intent specified any type ({@literal *}/*). This
// can be a whole heck of a lot of things, so as a first
// cut let's use the action instead.
firstTypeCut = mTypedActionToFilter.get(intent.getAction());
if (debug) Log.v(TAG, "Typed Action list: " + firstTypeCut);
}
}
}
// If the intent includes a data URI, then we want to collect all of
// the filters that match its scheme (we will further refine matches
// on the authority and path by directly matching each resulting filter).
if (scheme != null) {
schemeCut = mSchemeToFilter.get(scheme);
if (debug) Log.v(TAG, "Scheme list: " + schemeCut);
}
// If the intent does not specify any data -- either a MIME type or
// a URI -- then we will only be looking for matches against empty
// data.
if (resolvedType == null && scheme == null && intent.getAction() != null) {
firstTypeCut = mActionToFilter.get(intent.getAction());
if (debug) Log.v(TAG, "Action list: " + firstTypeCut);
}
if (firstTypeCut != null) {
buildResolveList(intent, debug, defaultOnly,
resolvedType, scheme, firstTypeCut, finalList);
}
if (secondTypeCut != null) {
buildResolveList(intent, debug, defaultOnly,
resolvedType, scheme, secondTypeCut, finalList);
}
if (thirdTypeCut != null) {
buildResolveList(intent, debug, defaultOnly,
resolvedType, scheme, thirdTypeCut, finalList);
}
if (schemeCut != null) {
buildResolveList(intent, debug, defaultOnly,
resolvedType, scheme, schemeCut, finalList);
}
sortResults(finalList);
if (debug) {
Log.v(TAG, "Final result list:");
for (R r : finalList) {
Log.v(TAG, " " + r);
}
}
return finalList;
}
/**
* Control whether the given filter is allowed to go into the result
* list. Mainly intended to prevent adding multiple filters for the
* same target object.
*/
protected boolean allowFilterResult(F filter, List<R> dest) {
return true;
}
protected R newResult(F filter, int match) {
return (R)filter;
}
protected void sortResults(List<R> results) {
Collections.sort(results, mResolvePrioritySorter);
}
protected void dumpFilter(Printer out, String prefix, F filter) {
out.println(prefix + filter);
}
private final int register_mime_types(F filter, String prefix) {
final Iterator<String> i = filter.typesIterator();
if (i == null) {
return 0;
}
int num = 0;
while (i.hasNext()) {
String name = (String)i.next();
num++;
if (localLOGV) Log.v(TAG, prefix + name);
String baseName = name;
final int slashpos = name.indexOf('/');
if (slashpos > 0) {
baseName = name.substring(0, slashpos).intern();
} else {
name = name + "/*";
}
ArrayList<F> array = mTypeToFilter.get(name);
if (array == null) {
//Log.v(TAG, "Creating new array for " + name);
array = new ArrayList<F>();
mTypeToFilter.put(name, array);
}
array.add(filter);
if (slashpos > 0) {
array = mBaseTypeToFilter.get(baseName);
if (array == null) {
//Log.v(TAG, "Creating new array for " + name);
array = new ArrayList<F>();
mBaseTypeToFilter.put(baseName, array);
}
array.add(filter);
} else {
array = mWildTypeToFilter.get(baseName);
if (array == null) {
//Log.v(TAG, "Creating new array for " + name);
array = new ArrayList<F>();
mWildTypeToFilter.put(baseName, array);
}
array.add(filter);
}
}
return num;
}
private final int unregister_mime_types(F filter, String prefix) {
final Iterator<String> i = filter.typesIterator();
if (i == null) {
return 0;
}
int num = 0;
while (i.hasNext()) {
String name = (String)i.next();
num++;
if (localLOGV) Log.v(TAG, prefix + name);
String baseName = name;
final int slashpos = name.indexOf('/');
if (slashpos > 0) {
baseName = name.substring(0, slashpos).intern();
} else {
name = name + "/*";
}
if (!remove_all_objects(mTypeToFilter.get(name), filter)) {
mTypeToFilter.remove(name);
}
if (slashpos > 0) {
if (!remove_all_objects(mBaseTypeToFilter.get(baseName), filter)) {
mBaseTypeToFilter.remove(baseName);
}
} else {
if (!remove_all_objects(mWildTypeToFilter.get(baseName), filter)) {
mWildTypeToFilter.remove(baseName);
}
}
}
return num;
}
private final int register_intent_filter(F filter, Iterator<String> i,
HashMap<String, ArrayList<F>> dest, String prefix) {
if (i == null) {
return 0;
}
int num = 0;
while (i.hasNext()) {
String name = i.next();
num++;
if (localLOGV) Log.v(TAG, prefix + name);
ArrayList<F> array = dest.get(name);
if (array == null) {
//Log.v(TAG, "Creating new array for " + name);
array = new ArrayList<F>();
dest.put(name, array);
}
array.add(filter);
}
return num;
}
private final int unregister_intent_filter(F filter, Iterator<String> i,
HashMap<String, ArrayList<F>> dest, String prefix) {
if (i == null) {
return 0;
}
int num = 0;
while (i.hasNext()) {
String name = i.next();
num++;
if (localLOGV) Log.v(TAG, prefix + name);
if (!remove_all_objects(dest.get(name), filter)) {
dest.remove(name);
}
}
return num;
}
private final boolean remove_all_objects(List<F> list, Object object) {
if (list != null) {
int N = list.size();
for (int idx=0; idx<N; idx++) {
if (list.get(idx) == object) {
list.remove(idx);
idx--;
N--;
}
}
return N > 0;
}
return false;
}
private void buildResolveList(Intent intent, boolean debug, boolean defaultOnly,
String resolvedType, String scheme, List<F> src, List<R> dest) {
Set<String> categories = intent.getCategories();
final int N = src != null ? src.size() : 0;
boolean hasNonDefaults = false;
int i;
for (i=0; i<N; i++) {
F filter = src.get(i);
int match;
if (debug) Log.v(TAG, "Matching against filter " + filter);
// Do we already have this one?
if (!allowFilterResult(filter, dest)) {
if (debug) {
Log.v(TAG, " Filter's target already added");
}
continue;
}
match = filter.match(
intent.getAction(), resolvedType, scheme, intent.getData(), categories, TAG);
if (match >= 0) {
if (debug) Log.v(TAG, " Filter matched! match=0x" +
Integer.toHexString(match));
if (!defaultOnly || filter.hasCategory(Intent.CATEGORY_DEFAULT)) {
final R oneResult = newResult(filter, match);
if (oneResult != null) {
dest.add(oneResult);
}
} else {
hasNonDefaults = true;
}
} else {
if (debug) {
String reason;
switch (match) {
case IntentFilter.NO_MATCH_ACTION: reason = "action"; break;
case IntentFilter.NO_MATCH_CATEGORY: reason = "category"; break;
case IntentFilter.NO_MATCH_DATA: reason = "data"; break;
case IntentFilter.NO_MATCH_TYPE: reason = "type"; break;
default: reason = "unknown reason"; break;
}
Log.v(TAG, " Filter did not match: " + reason);
}
}
}
if (dest.size() == 0 && hasNonDefaults) {
Log.w(TAG, "resolveIntent failed: found match, but none with Intent.CATEGORY_DEFAULT");
}
}
// Sorts a List of IntentFilter objects into descending priority order.
private static final Comparator mResolvePrioritySorter = new Comparator() {
public int compare(Object o1, Object o2) {
float q1 = ((IntentFilter)o1).getPriority();
float q2 = ((IntentFilter)o2).getPriority();
return (q1 > q2) ? -1 : ((q1 < q2) ? 1 : 0);
}
};
/**
* All filters that have been registered.
*/
private final HashSet<F> mFilters = new HashSet<F>();
/**
* All of the MIME types that have been registered, such as "image/jpeg",
* "image/*", or "{@literal *}/*".
*/
private final HashMap<String, ArrayList<F>> mTypeToFilter
= new HashMap<String, ArrayList<F>>();
/**
* The base names of all of all fully qualified MIME types that have been
* registered, such as "image" or "*". Wild card MIME types such as
* "image/*" will not be here.
*/
private final HashMap<String, ArrayList<F>> mBaseTypeToFilter
= new HashMap<String, ArrayList<F>>();
/**
* The base names of all of the MIME types with a sub-type wildcard that
* have been registered. For example, a filter with "image/*" will be
* included here as "image" but one with "image/jpeg" will not be
* included here. This also includes the "*" for the "{@literal *}/*"
* MIME type.
*/
private final HashMap<String, ArrayList<F>> mWildTypeToFilter
= new HashMap<String, ArrayList<F>>();
/**
* All of the URI schemes (such as http) that have been registered.
*/
private final HashMap<String, ArrayList<F>> mSchemeToFilter
= new HashMap<String, ArrayList<F>>();
/**
* All of the actions that have been registered, but only those that did
* not specify data.
*/
private final HashMap<String, ArrayList<F>> mActionToFilter
= new HashMap<String, ArrayList<F>>();
/**
* All of the actions that have been registered and specified a MIME type.
*/
private final HashMap<String, ArrayList<F>> mTypedActionToFilter
= new HashMap<String, ArrayList<F>>();
}
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