libs/androidfw/AttributeResolution.cpp - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2016 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.
  */

 #include "androidfw/AttributeResolution.h"

 #include <cstdint>

 #include <log/log.h>

 #include "androidfw/AssetManager2.h"
 #include "androidfw/AttributeFinder.h"

 constexpr bool kDebugStyles = false;

 namespace android {

 // Java asset cookies have 0 as an invalid cookie, but TypedArray expects < 0.
 static uint32_t ApkAssetsCookieToJavaCookie(ApkAssetsCookie cookie) {
   return cookie != kInvalidCookie ? static_cast<uint32_t>(cookie + 1) : static_cast<uint32_t>(-1);
 }

 class XmlAttributeFinder
     : public BackTrackingAttributeFinder<XmlAttributeFinder, size_t> {
  public:
   explicit XmlAttributeFinder(const ResXMLParser* parser)
       : BackTrackingAttributeFinder(
             0, parser != nullptr ? parser->getAttributeCount() : 0),
         parser_(parser) {}

   inline uint32_t GetAttribute(size_t index) const {
     return parser_->getAttributeNameResID(index);
   }

  private:
   const ResXMLParser* parser_;
 };

 class BagAttributeFinder
     : public BackTrackingAttributeFinder<BagAttributeFinder, const ResolvedBag::Entry*> {
  public:
   explicit BagAttributeFinder(const ResolvedBag* bag)
       : BackTrackingAttributeFinder(bag != nullptr ? bag->entries : nullptr,
                                     bag != nullptr ? bag->entries + bag->entry_count : nullptr) {
   }

   inline uint32_t GetAttribute(const ResolvedBag::Entry* entry) const {
     return entry->key;
   }
 };

 bool ResolveAttrs(Theme* theme, uint32_t def_style_attr, uint32_t def_style_res,
                   uint32_t* src_values, size_t src_values_length, uint32_t* attrs,
                   size_t attrs_length, uint32_t* out_values, uint32_t* out_indices) {
   if (kDebugStyles) {
     ALOGI("APPLY STYLE: theme=0x%p defStyleAttr=0x%x defStyleRes=0x%x", theme,
           def_style_attr, def_style_res);
   }

   AssetManager2* assetmanager = theme->GetAssetManager();
   ResTable_config config;
   Res_value value;

   int indices_idx = 0;

   // Load default style from attribute, if specified...
   uint32_t def_style_flags = 0u;
   if (def_style_attr != 0) {
     Res_value value;
     if (theme->GetAttribute(def_style_attr, &value, &def_style_flags) != kInvalidCookie) {
       if (value.dataType == Res_value::TYPE_REFERENCE) {
         def_style_res = value.data;
       }
     }
   }

   // Retrieve the default style bag, if requested.
   const ResolvedBag* default_style_bag = nullptr;
   if (def_style_res != 0) {
     default_style_bag = assetmanager->GetBag(def_style_res);
     if (default_style_bag != nullptr) {
       def_style_flags |= default_style_bag->type_spec_flags;
     }
   }

   BagAttributeFinder def_style_attr_finder(default_style_bag);

   // Now iterate through all of the attributes that the client has requested,
   // filling in each with whatever data we can find.
   for (size_t ii = 0; ii < attrs_length; ii++) {
     const uint32_t cur_ident = attrs[ii];

     if (kDebugStyles) {
       ALOGI("RETRIEVING ATTR 0x%08x...", cur_ident);
     }

     ApkAssetsCookie cookie = kInvalidCookie;
     uint32_t type_set_flags = 0;

     value.dataType = Res_value::TYPE_NULL;
     value.data = Res_value::DATA_NULL_UNDEFINED;
     config.density = 0;

     // Try to find a value for this attribute...  we prioritize values
     // coming from, first XML attributes, then XML style, then default
     // style, and finally the theme.

     // Retrieve the current input value if available.
     if (src_values_length > 0 && src_values[ii] != 0) {
       value.dataType = Res_value::TYPE_ATTRIBUTE;
       value.data = src_values[ii];
       if (kDebugStyles) {
         ALOGI("-> From values: type=0x%x, data=0x%08x", value.dataType, value.data);
       }
     } else {
       const ResolvedBag::Entry* const entry = def_style_attr_finder.Find(cur_ident);
       if (entry != def_style_attr_finder.end()) {
         cookie = entry->cookie;
         type_set_flags = def_style_flags;
         value = entry->value;
         if (kDebugStyles) {
           ALOGI("-> From def style: type=0x%x, data=0x%08x", value.dataType, value.data);
         }
       }
     }

     uint32_t resid = 0;
     if (value.dataType != Res_value::TYPE_NULL) {
       // Take care of resolving the found resource to its final value.
       ApkAssetsCookie new_cookie =
           theme->ResolveAttributeReference(cookie, &value, &config, &type_set_flags, &resid);
       if (new_cookie != kInvalidCookie) {
         cookie = new_cookie;
       }
       if (kDebugStyles) {
         ALOGI("-> Resolved attr: type=0x%x, data=0x%08x", value.dataType, value.data);
       }
     } else if (value.data != Res_value::DATA_NULL_EMPTY) {
       // If we still don't have a value for this attribute, try to find it in the theme!
       ApkAssetsCookie new_cookie = theme->GetAttribute(cur_ident, &value, &type_set_flags);
       if (new_cookie != kInvalidCookie) {
         if (kDebugStyles) {
           ALOGI("-> From theme: type=0x%x, data=0x%08x", value.dataType, value.data);
         }
         new_cookie =
             assetmanager->ResolveReference(new_cookie, &value, &config, &type_set_flags, &resid);
         if (new_cookie != kInvalidCookie) {
           cookie = new_cookie;
         }
         if (kDebugStyles) {
           ALOGI("-> Resolved theme: type=0x%x, data=0x%08x", value.dataType, value.data);
         }
       }
     }

     // Deal with the special @null value -- it turns back to TYPE_NULL.
     if (value.dataType == Res_value::TYPE_REFERENCE && value.data == 0) {
       if (kDebugStyles) {
         ALOGI("-> Setting to @null!");
       }
       value.dataType = Res_value::TYPE_NULL;
       value.data = Res_value::DATA_NULL_UNDEFINED;
       cookie = kInvalidCookie;
     }

     if (kDebugStyles) {
       ALOGI("Attribute 0x%08x: type=0x%x, data=0x%08x", cur_ident, value.dataType, value.data);
     }

     // Write the final value back to Java.
     out_values[STYLE_TYPE] = value.dataType;
     out_values[STYLE_DATA] = value.data;
     out_values[STYLE_ASSET_COOKIE] = ApkAssetsCookieToJavaCookie(cookie);
     out_values[STYLE_RESOURCE_ID] = resid;
     out_values[STYLE_CHANGING_CONFIGURATIONS] = type_set_flags;
     out_values[STYLE_DENSITY] = config.density;

     if (out_indices != nullptr &&
         (value.dataType != Res_value::TYPE_NULL || value.data == Res_value::DATA_NULL_EMPTY)) {
       indices_idx++;
       out_indices[indices_idx] = ii;
     }

     out_values += STYLE_NUM_ENTRIES;
   }

   if (out_indices != nullptr) {
     out_indices[0] = indices_idx;
   }
   return true;
 }

 void ApplyStyle(Theme* theme, ResXMLParser* xml_parser, uint32_t def_style_attr,
                 uint32_t def_style_resid, const uint32_t* attrs, size_t attrs_length,
                 uint32_t* out_values, uint32_t* out_indices) {
   if (kDebugStyles) {
     ALOGI("APPLY STYLE: theme=0x%p defStyleAttr=0x%x defStyleRes=0x%x xml=0x%p", theme,
           def_style_attr, def_style_resid, xml_parser);
   }

   AssetManager2* assetmanager = theme->GetAssetManager();
   ResTable_config config;
   Res_value value;

   int indices_idx = 0;

   // Load default style from attribute, if specified...
   uint32_t def_style_flags = 0u;
   if (def_style_attr != 0) {
     Res_value value;
     if (theme->GetAttribute(def_style_attr, &value, &def_style_flags) != kInvalidCookie) {
       if (value.dataType == Res_value::TYPE_REFERENCE) {
         def_style_resid = value.data;
       }
     }
   }

   // Retrieve the style resource ID associated with the current XML tag's style attribute.
   uint32_t style_resid = 0u;
   uint32_t style_flags = 0u;
   if (xml_parser != nullptr) {
     ssize_t idx = xml_parser->indexOfStyle();
     if (idx >= 0 && xml_parser->getAttributeValue(idx, &value) >= 0) {
       if (value.dataType == value.TYPE_ATTRIBUTE) {
         // Resolve the attribute with out theme.
         if (theme->GetAttribute(value.data, &value, &style_flags) == kInvalidCookie) {
           value.dataType = Res_value::TYPE_NULL;
         }
       }

       if (value.dataType == value.TYPE_REFERENCE) {
         style_resid = value.data;
       }
     }
   }

   // Retrieve the default style bag, if requested.
   const ResolvedBag* default_style_bag = nullptr;
   if (def_style_resid != 0) {
     default_style_bag = assetmanager->GetBag(def_style_resid);
     if (default_style_bag != nullptr) {
       def_style_flags |= default_style_bag->type_spec_flags;
     }
   }

   BagAttributeFinder def_style_attr_finder(default_style_bag);

   // Retrieve the style class bag, if requested.
   const ResolvedBag* xml_style_bag = nullptr;
   if (style_resid != 0) {
     xml_style_bag = assetmanager->GetBag(style_resid);
     if (xml_style_bag != nullptr) {
       style_flags |= xml_style_bag->type_spec_flags;
     }
   }

   BagAttributeFinder xml_style_attr_finder(xml_style_bag);

   // Retrieve the XML attributes, if requested.
   XmlAttributeFinder xml_attr_finder(xml_parser);

   // Now iterate through all of the attributes that the client has requested,
   // filling in each with whatever data we can find.
   for (size_t ii = 0; ii < attrs_length; ii++) {
     const uint32_t cur_ident = attrs[ii];

     if (kDebugStyles) {
       ALOGI("RETRIEVING ATTR 0x%08x...", cur_ident);
     }

     ApkAssetsCookie cookie = kInvalidCookie;
     uint32_t type_set_flags = 0u;

     value.dataType = Res_value::TYPE_NULL;
     value.data = Res_value::DATA_NULL_UNDEFINED;
     config.density = 0;
     uint32_t value_source_resid = 0;

     // Try to find a value for this attribute...  we prioritize values
     // coming from, first XML attributes, then XML style, then default
     // style, and finally the theme.

     // Walk through the xml attributes looking for the requested attribute.
     const size_t xml_attr_idx = xml_attr_finder.Find(cur_ident);
     if (xml_attr_idx != xml_attr_finder.end()) {
       // We found the attribute we were looking for.
       xml_parser->getAttributeValue(xml_attr_idx, &value);
       if (kDebugStyles) {
         ALOGI("-> From XML: type=0x%x, data=0x%08x", value.dataType, value.data);
       }
       value_source_resid = xml_parser->getSourceResourceId();
     }

     if (value.dataType == Res_value::TYPE_NULL && value.data != Res_value::DATA_NULL_EMPTY) {
       // Walk through the style class values looking for the requested attribute.
       const ResolvedBag::Entry* entry = xml_style_attr_finder.Find(cur_ident);
       if (entry != xml_style_attr_finder.end()) {
         // We found the attribute we were looking for.
         cookie = entry->cookie;
         type_set_flags = style_flags;
         value = entry->value;
         value_source_resid = entry->style;
         if (kDebugStyles) {
           ALOGI("-> From style: type=0x%x, data=0x%08x, style=0x%08x", value.dataType, value.data,
               entry->style);
         }
       }
     }

     if (value.dataType == Res_value::TYPE_NULL && value.data != Res_value::DATA_NULL_EMPTY) {
       // Walk through the default style values looking for the requested attribute.
       const ResolvedBag::Entry* entry = def_style_attr_finder.Find(cur_ident);
       if (entry != def_style_attr_finder.end()) {
         // We found the attribute we were looking for.
         cookie = entry->cookie;
         type_set_flags = def_style_flags;
         value = entry->value;
         if (kDebugStyles) {
           ALOGI("-> From def style: type=0x%x, data=0x%08x, style=0x%08x", value.dataType, value.data,
               entry->style);
         }
         value_source_resid = entry->style;
       }
     }

     uint32_t resid = 0u;
     if (value.dataType != Res_value::TYPE_NULL) {
       // Take care of resolving the found resource to its final value.
       ApkAssetsCookie new_cookie =
           theme->ResolveAttributeReference(cookie, &value, &config, &type_set_flags, &resid);
       if (new_cookie != kInvalidCookie) {
         cookie = new_cookie;
       }

       if (kDebugStyles) {
         ALOGI("-> Resolved attr: type=0x%x, data=0x%08x", value.dataType, value.data);
       }
     } else if (value.data != Res_value::DATA_NULL_EMPTY) {
       // If we still don't have a value for this attribute, try to find it in the theme!
       ApkAssetsCookie new_cookie = theme->GetAttribute(cur_ident, &value, &type_set_flags);
       // TODO: set value_source_resid for the style in the theme that was used.
       if (new_cookie != kInvalidCookie) {
         if (kDebugStyles) {
           ALOGI("-> From theme: type=0x%x, data=0x%08x", value.dataType, value.data);
         }
         new_cookie =
             assetmanager->ResolveReference(new_cookie, &value, &config, &type_set_flags, &resid);
         if (new_cookie != kInvalidCookie) {
           cookie = new_cookie;
         }

         if (kDebugStyles) {
           ALOGI("-> Resolved theme: type=0x%x, data=0x%08x", value.dataType, value.data);
         }
       }
     }

     // Deal with the special @null value -- it turns back to TYPE_NULL.
     if (value.dataType == Res_value::TYPE_REFERENCE && value.data == 0) {
       if (kDebugStyles) {
         ALOGI("-> Setting to @null!");
       }
       value.dataType = Res_value::TYPE_NULL;
       value.data = Res_value::DATA_NULL_UNDEFINED;
       cookie = kInvalidCookie;
     }

     if (kDebugStyles) {
       ALOGI("Attribute 0x%08x: type=0x%x, data=0x%08x", cur_ident, value.dataType, value.data);
     }

     // Write the final value back to Java.
     out_values[STYLE_TYPE] = value.dataType;
     out_values[STYLE_DATA] = value.data;
     out_values[STYLE_ASSET_COOKIE] = ApkAssetsCookieToJavaCookie(cookie);
     out_values[STYLE_RESOURCE_ID] = resid;
     out_values[STYLE_CHANGING_CONFIGURATIONS] = type_set_flags;
     out_values[STYLE_DENSITY] = config.density;
     out_values[STYLE_SOURCE_RESOURCE_ID] = value_source_resid;

     if (value.dataType != Res_value::TYPE_NULL || value.data == Res_value::DATA_NULL_EMPTY) {
       indices_idx++;

       // out_indices must NOT be nullptr.
       out_indices[indices_idx] = ii;
     }
     out_values += STYLE_NUM_ENTRIES;
   }

   // out_indices must NOT be nullptr.
   out_indices[0] = indices_idx;
 }

 bool RetrieveAttributes(AssetManager2* assetmanager, ResXMLParser* xml_parser, uint32_t* attrs,
                         size_t attrs_length, uint32_t* out_values, uint32_t* out_indices) {
   ResTable_config config;
   Res_value value;

   int indices_idx = 0;

   // Retrieve the XML attributes, if requested.
   const size_t xml_attr_count = xml_parser->getAttributeCount();
   size_t ix = 0;
   uint32_t cur_xml_attr = xml_parser->getAttributeNameResID(ix);

   // Now iterate through all of the attributes that the client has requested,
   // filling in each with whatever data we can find.
   for (size_t ii = 0; ii < attrs_length; ii++) {
     const uint32_t cur_ident = attrs[ii];
     ApkAssetsCookie cookie = kInvalidCookie;
     uint32_t type_set_flags = 0u;

     value.dataType = Res_value::TYPE_NULL;
     value.data = Res_value::DATA_NULL_UNDEFINED;
     config.density = 0;

     // Try to find a value for this attribute...
     // Skip through XML attributes until the end or the next possible match.
     while (ix < xml_attr_count && cur_ident > cur_xml_attr) {
       ix++;
       cur_xml_attr = xml_parser->getAttributeNameResID(ix);
     }
     // Retrieve the current XML attribute if it matches, and step to next.
     if (ix < xml_attr_count && cur_ident == cur_xml_attr) {
       xml_parser->getAttributeValue(ix, &value);
       ix++;
       cur_xml_attr = xml_parser->getAttributeNameResID(ix);
     }

     uint32_t resid = 0u;
     if (value.dataType != Res_value::TYPE_NULL) {
       // Take care of resolving the found resource to its final value.
       ApkAssetsCookie new_cookie =
           assetmanager->ResolveReference(cookie, &value, &config, &type_set_flags, &resid);
       if (new_cookie != kInvalidCookie) {
         cookie = new_cookie;
       }
     }

     // Deal with the special @null value -- it turns back to TYPE_NULL.
     if (value.dataType == Res_value::TYPE_REFERENCE && value.data == 0) {
       value.dataType = Res_value::TYPE_NULL;
       value.data = Res_value::DATA_NULL_UNDEFINED;
       cookie = kInvalidCookie;
     }

     // Write the final value back to Java.
     out_values[STYLE_TYPE] = value.dataType;
     out_values[STYLE_DATA] = value.data;
     out_values[STYLE_ASSET_COOKIE] = ApkAssetsCookieToJavaCookie(cookie);
     out_values[STYLE_RESOURCE_ID] = resid;
     out_values[STYLE_CHANGING_CONFIGURATIONS] = type_set_flags;
     out_values[STYLE_DENSITY] = config.density;

     if (out_indices != nullptr &&
         (value.dataType != Res_value::TYPE_NULL || value.data == Res_value::DATA_NULL_EMPTY)) {
       indices_idx++;
       out_indices[indices_idx] = ii;
     }

     out_values += STYLE_NUM_ENTRIES;
   }

   if (out_indices != nullptr) {
     out_indices[0] = indices_idx;
   }
   return true;
 }

 }  // namespace android
	/*
	* Copyright (C) 2016 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.
	*/

	#include "androidfw/AttributeResolution.h"

	#include <cstdint>

	#include <log/log.h>

	#include "androidfw/AssetManager2.h"
	#include "androidfw/AttributeFinder.h"

	constexpr bool kDebugStyles = false;

	namespace android {

	// Java asset cookies have 0 as an invalid cookie, but TypedArray expects < 0.
	static uint32_t ApkAssetsCookieToJavaCookie(ApkAssetsCookie cookie) {
	return cookie != kInvalidCookie ? static_cast<uint32_t>(cookie + 1) : static_cast<uint32_t>(-1);
	}

	class XmlAttributeFinder
	: public BackTrackingAttributeFinder<XmlAttributeFinder, size_t> {
	public:
	explicit XmlAttributeFinder(const ResXMLParser* parser)
	: BackTrackingAttributeFinder(
	0, parser != nullptr ? parser->getAttributeCount() : 0),
	parser_(parser) {}

	inline uint32_t GetAttribute(size_t index) const {
	return parser_->getAttributeNameResID(index);
	}

	private:
	const ResXMLParser* parser_;
	};

	class BagAttributeFinder
	: public BackTrackingAttributeFinder<BagAttributeFinder, const ResolvedBag::Entry*> {
	public:
	explicit BagAttributeFinder(const ResolvedBag* bag)
	: BackTrackingAttributeFinder(bag != nullptr ? bag->entries : nullptr,
	bag != nullptr ? bag->entries + bag->entry_count : nullptr) {
	}

	inline uint32_t GetAttribute(const ResolvedBag::Entry* entry) const {
	return entry->key;
	}
	};

	bool ResolveAttrs(Theme* theme, uint32_t def_style_attr, uint32_t def_style_res,
	uint32_t* src_values, size_t src_values_length, uint32_t* attrs,
	size_t attrs_length, uint32_t* out_values, uint32_t* out_indices) {
	if (kDebugStyles) {
	ALOGI("APPLY STYLE: theme=0x%p defStyleAttr=0x%x defStyleRes=0x%x", theme,
	def_style_attr, def_style_res);
	}

	AssetManager2* assetmanager = theme->GetAssetManager();
	ResTable_config config;
	Res_value value;

	int indices_idx = 0;

	// Load default style from attribute, if specified...
	uint32_t def_style_flags = 0u;
	if (def_style_attr != 0) {
	Res_value value;
	if (theme->GetAttribute(def_style_attr, &value, &def_style_flags) != kInvalidCookie) {
	if (value.dataType == Res_value::TYPE_REFERENCE) {
	def_style_res = value.data;
	}
	}
	}

	// Retrieve the default style bag, if requested.
	const ResolvedBag* default_style_bag = nullptr;
	if (def_style_res != 0) {
	default_style_bag = assetmanager->GetBag(def_style_res);
	if (default_style_bag != nullptr) {
	def_style_flags \|= default_style_bag->type_spec_flags;
	}
	}

	BagAttributeFinder def_style_attr_finder(default_style_bag);

	// Now iterate through all of the attributes that the client has requested,
	// filling in each with whatever data we can find.
	for (size_t ii = 0; ii < attrs_length; ii++) {
	const uint32_t cur_ident = attrs[ii];

	if (kDebugStyles) {
	ALOGI("RETRIEVING ATTR 0x%08x...", cur_ident);
	}

	ApkAssetsCookie cookie = kInvalidCookie;
	uint32_t type_set_flags = 0;

	value.dataType = Res_value::TYPE_NULL;
	value.data = Res_value::DATA_NULL_UNDEFINED;
	config.density = 0;

	// Try to find a value for this attribute... we prioritize values
	// coming from, first XML attributes, then XML style, then default
	// style, and finally the theme.

	// Retrieve the current input value if available.
	if (src_values_length > 0 && src_values[ii] != 0) {
	value.dataType = Res_value::TYPE_ATTRIBUTE;
	value.data = src_values[ii];
	if (kDebugStyles) {
	ALOGI("-> From values: type=0x%x, data=0x%08x", value.dataType, value.data);
	}
	} else {
	const ResolvedBag::Entry* const entry = def_style_attr_finder.Find(cur_ident);
	if (entry != def_style_attr_finder.end()) {
	cookie = entry->cookie;
	type_set_flags = def_style_flags;
	value = entry->value;
	if (kDebugStyles) {
	ALOGI("-> From def style: type=0x%x, data=0x%08x", value.dataType, value.data);
	}
	}
	}

	uint32_t resid = 0;
	if (value.dataType != Res_value::TYPE_NULL) {
	// Take care of resolving the found resource to its final value.
	ApkAssetsCookie new_cookie =
	theme->ResolveAttributeReference(cookie, &value, &config, &type_set_flags, &resid);
	if (new_cookie != kInvalidCookie) {
	cookie = new_cookie;
	}
	if (kDebugStyles) {
	ALOGI("-> Resolved attr: type=0x%x, data=0x%08x", value.dataType, value.data);
	}
	} else if (value.data != Res_value::DATA_NULL_EMPTY) {
	// If we still don't have a value for this attribute, try to find it in the theme!
	ApkAssetsCookie new_cookie = theme->GetAttribute(cur_ident, &value, &type_set_flags);
	if (new_cookie != kInvalidCookie) {
	if (kDebugStyles) {
	ALOGI("-> From theme: type=0x%x, data=0x%08x", value.dataType, value.data);
	}
	new_cookie =
	assetmanager->ResolveReference(new_cookie, &value, &config, &type_set_flags, &resid);
	if (new_cookie != kInvalidCookie) {
	cookie = new_cookie;
	}
	if (kDebugStyles) {
	ALOGI("-> Resolved theme: type=0x%x, data=0x%08x", value.dataType, value.data);
	}
	}
	}

	// Deal with the special @null value -- it turns back to TYPE_NULL.
	if (value.dataType == Res_value::TYPE_REFERENCE && value.data == 0) {
	if (kDebugStyles) {
	ALOGI("-> Setting to @null!");
	}
	value.dataType = Res_value::TYPE_NULL;
	value.data = Res_value::DATA_NULL_UNDEFINED;
	cookie = kInvalidCookie;
	}

	if (kDebugStyles) {
	ALOGI("Attribute 0x%08x: type=0x%x, data=0x%08x", cur_ident, value.dataType, value.data);
	}

	// Write the final value back to Java.
	out_values[STYLE_TYPE] = value.dataType;
	out_values[STYLE_DATA] = value.data;
	out_values[STYLE_ASSET_COOKIE] = ApkAssetsCookieToJavaCookie(cookie);
	out_values[STYLE_RESOURCE_ID] = resid;
	out_values[STYLE_CHANGING_CONFIGURATIONS] = type_set_flags;
	out_values[STYLE_DENSITY] = config.density;

	if (out_indices != nullptr &&
	(value.dataType != Res_value::TYPE_NULL \|\| value.data == Res_value::DATA_NULL_EMPTY)) {
	indices_idx++;
	out_indices[indices_idx] = ii;
	}

	out_values += STYLE_NUM_ENTRIES;
	}

	if (out_indices != nullptr) {
	out_indices[0] = indices_idx;
	}
	return true;
	}

	void ApplyStyle(Theme* theme, ResXMLParser* xml_parser, uint32_t def_style_attr,
	uint32_t def_style_resid, const uint32_t* attrs, size_t attrs_length,
	uint32_t* out_values, uint32_t* out_indices) {
	if (kDebugStyles) {
	ALOGI("APPLY STYLE: theme=0x%p defStyleAttr=0x%x defStyleRes=0x%x xml=0x%p", theme,
	def_style_attr, def_style_resid, xml_parser);
	}

	AssetManager2* assetmanager = theme->GetAssetManager();
	ResTable_config config;
	Res_value value;

	int indices_idx = 0;

	// Load default style from attribute, if specified...
	uint32_t def_style_flags = 0u;
	if (def_style_attr != 0) {
	Res_value value;
	if (theme->GetAttribute(def_style_attr, &value, &def_style_flags) != kInvalidCookie) {
	if (value.dataType == Res_value::TYPE_REFERENCE) {
	def_style_resid = value.data;
	}
	}
	}

	// Retrieve the style resource ID associated with the current XML tag's style attribute.
	uint32_t style_resid = 0u;
	uint32_t style_flags = 0u;
	if (xml_parser != nullptr) {
	ssize_t idx = xml_parser->indexOfStyle();
	if (idx >= 0 && xml_parser->getAttributeValue(idx, &value) >= 0) {
	if (value.dataType == value.TYPE_ATTRIBUTE) {
	// Resolve the attribute with out theme.
	if (theme->GetAttribute(value.data, &value, &style_flags) == kInvalidCookie) {
	value.dataType = Res_value::TYPE_NULL;
	}
	}

	if (value.dataType == value.TYPE_REFERENCE) {
	style_resid = value.data;
	}
	}
	}

	// Retrieve the default style bag, if requested.
	const ResolvedBag* default_style_bag = nullptr;
	if (def_style_resid != 0) {
	default_style_bag = assetmanager->GetBag(def_style_resid);
	if (default_style_bag != nullptr) {
	def_style_flags \|= default_style_bag->type_spec_flags;
	}
	}

	BagAttributeFinder def_style_attr_finder(default_style_bag);

	// Retrieve the style class bag, if requested.
	const ResolvedBag* xml_style_bag = nullptr;
	if (style_resid != 0) {
	xml_style_bag = assetmanager->GetBag(style_resid);
	if (xml_style_bag != nullptr) {
	style_flags \|= xml_style_bag->type_spec_flags;
	}
	}

	BagAttributeFinder xml_style_attr_finder(xml_style_bag);

	// Retrieve the XML attributes, if requested.
	XmlAttributeFinder xml_attr_finder(xml_parser);

	// Now iterate through all of the attributes that the client has requested,
	// filling in each with whatever data we can find.
	for (size_t ii = 0; ii < attrs_length; ii++) {
	const uint32_t cur_ident = attrs[ii];

	if (kDebugStyles) {
	ALOGI("RETRIEVING ATTR 0x%08x...", cur_ident);
	}

	ApkAssetsCookie cookie = kInvalidCookie;
	uint32_t type_set_flags = 0u;

	value.dataType = Res_value::TYPE_NULL;
	value.data = Res_value::DATA_NULL_UNDEFINED;
	config.density = 0;
	uint32_t value_source_resid = 0;

	// Try to find a value for this attribute... we prioritize values
	// coming from, first XML attributes, then XML style, then default
	// style, and finally the theme.

	// Walk through the xml attributes looking for the requested attribute.
	const size_t xml_attr_idx = xml_attr_finder.Find(cur_ident);
	if (xml_attr_idx != xml_attr_finder.end()) {
	// We found the attribute we were looking for.
	xml_parser->getAttributeValue(xml_attr_idx, &value);
	if (kDebugStyles) {
	ALOGI("-> From XML: type=0x%x, data=0x%08x", value.dataType, value.data);
	}
	value_source_resid = xml_parser->getSourceResourceId();
	}

	if (value.dataType == Res_value::TYPE_NULL && value.data != Res_value::DATA_NULL_EMPTY) {
	// Walk through the style class values looking for the requested attribute.
	const ResolvedBag::Entry* entry = xml_style_attr_finder.Find(cur_ident);
	if (entry != xml_style_attr_finder.end()) {
	// We found the attribute we were looking for.
	cookie = entry->cookie;
	type_set_flags = style_flags;
	value = entry->value;
	value_source_resid = entry->style;
	if (kDebugStyles) {
	ALOGI("-> From style: type=0x%x, data=0x%08x, style=0x%08x", value.dataType, value.data,
	entry->style);
	}
	}
	}

	if (value.dataType == Res_value::TYPE_NULL && value.data != Res_value::DATA_NULL_EMPTY) {
	// Walk through the default style values looking for the requested attribute.
	const ResolvedBag::Entry* entry = def_style_attr_finder.Find(cur_ident);
	if (entry != def_style_attr_finder.end()) {
	// We found the attribute we were looking for.
	cookie = entry->cookie;
	type_set_flags = def_style_flags;
	value = entry->value;
	if (kDebugStyles) {
	ALOGI("-> From def style: type=0x%x, data=0x%08x, style=0x%08x", value.dataType, value.data,
	entry->style);
	}
	value_source_resid = entry->style;
	}
	}

	uint32_t resid = 0u;
	if (value.dataType != Res_value::TYPE_NULL) {
	// Take care of resolving the found resource to its final value.
	ApkAssetsCookie new_cookie =
	theme->ResolveAttributeReference(cookie, &value, &config, &type_set_flags, &resid);
	if (new_cookie != kInvalidCookie) {
	cookie = new_cookie;
	}

	if (kDebugStyles) {
	ALOGI("-> Resolved attr: type=0x%x, data=0x%08x", value.dataType, value.data);
	}
	} else if (value.data != Res_value::DATA_NULL_EMPTY) {
	// If we still don't have a value for this attribute, try to find it in the theme!
	ApkAssetsCookie new_cookie = theme->GetAttribute(cur_ident, &value, &type_set_flags);
	// TODO: set value_source_resid for the style in the theme that was used.
	if (new_cookie != kInvalidCookie) {
	if (kDebugStyles) {
	ALOGI("-> From theme: type=0x%x, data=0x%08x", value.dataType, value.data);
	}
	new_cookie =
	assetmanager->ResolveReference(new_cookie, &value, &config, &type_set_flags, &resid);
	if (new_cookie != kInvalidCookie) {
	cookie = new_cookie;
	}

	if (kDebugStyles) {
	ALOGI("-> Resolved theme: type=0x%x, data=0x%08x", value.dataType, value.data);
	}
	}
	}

	// Deal with the special @null value -- it turns back to TYPE_NULL.
	if (value.dataType == Res_value::TYPE_REFERENCE && value.data == 0) {
	if (kDebugStyles) {
	ALOGI("-> Setting to @null!");
	}
	value.dataType = Res_value::TYPE_NULL;
	value.data = Res_value::DATA_NULL_UNDEFINED;
	cookie = kInvalidCookie;
	}

	if (kDebugStyles) {
	ALOGI("Attribute 0x%08x: type=0x%x, data=0x%08x", cur_ident, value.dataType, value.data);
	}

	// Write the final value back to Java.
	out_values[STYLE_TYPE] = value.dataType;
	out_values[STYLE_DATA] = value.data;
	out_values[STYLE_ASSET_COOKIE] = ApkAssetsCookieToJavaCookie(cookie);
	out_values[STYLE_RESOURCE_ID] = resid;
	out_values[STYLE_CHANGING_CONFIGURATIONS] = type_set_flags;
	out_values[STYLE_DENSITY] = config.density;
	out_values[STYLE_SOURCE_RESOURCE_ID] = value_source_resid;

	if (value.dataType != Res_value::TYPE_NULL \|\| value.data == Res_value::DATA_NULL_EMPTY) {
	indices_idx++;

	// out_indices must NOT be nullptr.
	out_indices[indices_idx] = ii;
	}
	out_values += STYLE_NUM_ENTRIES;
	}

	// out_indices must NOT be nullptr.
	out_indices[0] = indices_idx;
	}

	bool RetrieveAttributes(AssetManager2* assetmanager, ResXMLParser* xml_parser, uint32_t* attrs,
	size_t attrs_length, uint32_t* out_values, uint32_t* out_indices) {
	ResTable_config config;
	Res_value value;

	int indices_idx = 0;

	// Retrieve the XML attributes, if requested.
	const size_t xml_attr_count = xml_parser->getAttributeCount();
	size_t ix = 0;
	uint32_t cur_xml_attr = xml_parser->getAttributeNameResID(ix);

	// Now iterate through all of the attributes that the client has requested,
	// filling in each with whatever data we can find.
	for (size_t ii = 0; ii < attrs_length; ii++) {
	const uint32_t cur_ident = attrs[ii];
	ApkAssetsCookie cookie = kInvalidCookie;
	uint32_t type_set_flags = 0u;

	value.dataType = Res_value::TYPE_NULL;
	value.data = Res_value::DATA_NULL_UNDEFINED;
	config.density = 0;

	// Try to find a value for this attribute...
	// Skip through XML attributes until the end or the next possible match.
	while (ix < xml_attr_count && cur_ident > cur_xml_attr) {
	ix++;
	cur_xml_attr = xml_parser->getAttributeNameResID(ix);
	}
	// Retrieve the current XML attribute if it matches, and step to next.
	if (ix < xml_attr_count && cur_ident == cur_xml_attr) {
	xml_parser->getAttributeValue(ix, &value);
	ix++;
	cur_xml_attr = xml_parser->getAttributeNameResID(ix);
	}

	uint32_t resid = 0u;
	if (value.dataType != Res_value::TYPE_NULL) {
	// Take care of resolving the found resource to its final value.
	ApkAssetsCookie new_cookie =
	assetmanager->ResolveReference(cookie, &value, &config, &type_set_flags, &resid);
	if (new_cookie != kInvalidCookie) {
	cookie = new_cookie;
	}
	}

	// Deal with the special @null value -- it turns back to TYPE_NULL.
	if (value.dataType == Res_value::TYPE_REFERENCE && value.data == 0) {
	value.dataType = Res_value::TYPE_NULL;
	value.data = Res_value::DATA_NULL_UNDEFINED;
	cookie = kInvalidCookie;
	}

	// Write the final value back to Java.
	out_values[STYLE_TYPE] = value.dataType;
	out_values[STYLE_DATA] = value.data;
	out_values[STYLE_ASSET_COOKIE] = ApkAssetsCookieToJavaCookie(cookie);
	out_values[STYLE_RESOURCE_ID] = resid;
	out_values[STYLE_CHANGING_CONFIGURATIONS] = type_set_flags;
	out_values[STYLE_DENSITY] = config.density;

	if (out_indices != nullptr &&
	(value.dataType != Res_value::TYPE_NULL \|\| value.data == Res_value::DATA_NULL_EMPTY)) {
	indices_idx++;
	out_indices[indices_idx] = ii;
	}

	out_values += STYLE_NUM_ENTRIES;
	}

	if (out_indices != nullptr) {
	out_indices[0] = indices_idx;
	}
	return true;
	}

	} // namespace android