Support creating BinaryDictionary without creating dict file.

Bug: 14166482
Change-Id: Ic8c78ec2c8f39358a1f085a041b608972a380eef

3 files changed, 29 insertions, 1 deletions

diff --git a/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h b/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h
index ab943a386..251a71941 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h
@@ -99,6 +99,27 @@ class HeaderPolicy : public DictionaryHeaderStructurePolicy {
               mMaxBigramCount(HeaderReadWriteUtils::readIntAttributeValue(
                       &mAttributeMap, MAX_BIGRAM_COUNT_KEY, DEFAULT_MAX_BIGRAM_COUNT)) {}
 
+    // Copy header information
+    HeaderPolicy(const HeaderPolicy *const headerPolicy)
+            : mDictFormatVersion(headerPolicy->mDictFormatVersion),
+              mDictionaryFlags(headerPolicy->mDictionaryFlags), mSize(headerPolicy->mSize),
+              mAttributeMap(headerPolicy->mAttributeMap), mLocale(headerPolicy->mLocale),
+              mMultiWordCostMultiplier(headerPolicy->mMultiWordCostMultiplier),
+              mRequiresGermanUmlautProcessing(headerPolicy->mRequiresGermanUmlautProcessing),
+              mIsDecayingDict(headerPolicy->mIsDecayingDict),
+              mDate(headerPolicy->mDate), mLastDecayedTime(headerPolicy->mLastDecayedTime),
+              mUnigramCount(headerPolicy->mUnigramCount), mBigramCount(headerPolicy->mBigramCount),
+              mExtendedRegionSize(headerPolicy->mExtendedRegionSize),
+              mHasHistoricalInfoOfWords(headerPolicy->mHasHistoricalInfoOfWords),
+              mForgettingCurveOccurrencesToLevelUp(
+                      headerPolicy->mForgettingCurveOccurrencesToLevelUp),
+              mForgettingCurveProbabilityValuesTableId(
+                      headerPolicy->mForgettingCurveProbabilityValuesTableId),
+              mForgettingCurveDurationToLevelDown(
+                      headerPolicy->mForgettingCurveDurationToLevelDown),
+              mMaxUnigramCount(headerPolicy->mMaxUnigramCount),
+              mMaxBigramCount(headerPolicy->mMaxBigramCount) {}
+
     // Temporary dummy header.
     HeaderPolicy()
             : mDictFormatVersion(FormatUtils::UNKNOWN_VERSION), mDictionaryFlags(0), mSize(0),
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/dictionary_structure_with_buffer_policy_factory.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/dictionary_structure_with_buffer_policy_factory.cpp
index eefedc346..be7e43b98 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/dictionary_structure_with_buffer_policy_factory.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/dictionary_structure_with_buffer_policy_factory.cpp
@@ -19,10 +19,12 @@
 #include <climits>
 
 #include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_writing_utils.h"
 #include "suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h"
 #include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h"
 #include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
 #include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h"
+#include "suggest/policyimpl/dictionary/utils/dict_file_writing_utils.h"
 #include "suggest/policyimpl/dictionary/utils/file_utils.h"
 #include "suggest/policyimpl/dictionary/utils/format_utils.h"
 #include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"
@@ -56,6 +58,11 @@ namespace latinime {
             Ver4DictBuffers::Ver4DictBuffersPtr dictBuffers =
                     Ver4DictBuffers::createVer4DictBuffers(&headerPolicy,
                             Ver4DictConstants::MAX_DICT_EXTENDED_REGION_SIZE);
+            if (!DynamicPtWritingUtils::writeEmptyDictionary(
+                    dictBuffers->getWritableTrieBuffer(), 0 /* rootPos */)) {
+                AKLOGE("Empty ver4 dictionary structure cannot be created on memory.");
+                return DictionaryStructureWithBufferPolicy::StructurePolicyPtr(nullptr);
+            }
             return DictionaryStructureWithBufferPolicy::StructurePolicyPtr(
                     new Ver4PatriciaTriePolicy(std::move(dictBuffers)));
         }
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.cpp
index eda882d46..95f654498 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.cpp
@@ -131,7 +131,7 @@ Ver4DictBuffers::Ver4DictBuffers(const char *const dictPath,
           mIsUpdatable(isUpdatable) {}
 
 Ver4DictBuffers::Ver4DictBuffers(const HeaderPolicy *const headerPolicy, const int maxTrieSize)
-        : mHeaderBuffer(nullptr), mDictBuffer(nullptr), mHeaderPolicy(),
+        : mHeaderBuffer(nullptr), mDictBuffer(nullptr), mHeaderPolicy(headerPolicy),
           mExpandableHeaderBuffer(Ver4DictConstants::MAX_DICTIONARY_SIZE),
           mExpandableTrieBuffer(maxTrieSize), mTerminalPositionLookupTable(),
           mProbabilityDictContent(headerPolicy->hasHistoricalInfoOfWords()),