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diff --git a/intl/icu/source/i18n/collationdatabuilder.h b/intl/icu/source/i18n/collationdatabuilder.h
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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+* Copyright (C) 2012-2014, International Business Machines
+* Corporation and others.  All Rights Reserved.
+*******************************************************************************
+* collationdatabuilder.h
+*
+* created on: 2012apr01
+* created by: Markus W. Scherer
+*/
+
+#ifndef __COLLATIONDATABUILDER_H__
+#define __COLLATIONDATABUILDER_H__
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_COLLATION
+
+#include "unicode/uniset.h"
+#include "unicode/unistr.h"
+#include "unicode/uversion.h"
+#include "collation.h"
+#include "collationdata.h"
+#include "collationsettings.h"
+#include "normalizer2impl.h"
+#include "utrie2.h"
+#include "uvectr32.h"
+#include "uvectr64.h"
+#include "uvector.h"
+
+U_NAMESPACE_BEGIN
+
+struct ConditionalCE32;
+
+class CollationFastLatinBuilder;
+class CopyHelper;
+class DataBuilderCollationIterator;
+class UCharsTrieBuilder;
+
+/**
+ * Low-level CollationData builder.
+ * Takes (character, CE) pairs and builds them into runtime data structures.
+ * Supports characters with context prefixes and contraction suffixes.
+ */
+class U_I18N_API CollationDataBuilder : public UObject {
+public:
+    /**
+     * Collation element modifier. Interface class for a modifier
+     * that changes a tailoring builder's temporary CEs to final CEs.
+     * Called for every non-special CE32 and every expansion CE.
+     */
+    class CEModifier : public UObject {
+    public:
+        virtual ~CEModifier();
+        /** Returns a new CE to replace the non-special input CE32, or else Collation::NO_CE. */
+        virtual int64_t modifyCE32(uint32_t ce32) const = 0;
+        /** Returns a new CE to replace the input CE, or else Collation::NO_CE. */
+        virtual int64_t modifyCE(int64_t ce) const = 0;
+    };
+
+    CollationDataBuilder(UBool icu4xMode, UErrorCode &errorCode);
+
+    virtual ~CollationDataBuilder();
+
+    void initForTailoring(const CollationData *b, UErrorCode &errorCode);
+
+    virtual UBool isCompressibleLeadByte(uint32_t b) const;
+
+    inline UBool isCompressiblePrimary(uint32_t p) const {
+        return isCompressibleLeadByte(p >> 24);
+    }
+
+    /**
+     * @return true if this builder has mappings (e.g., add() has been called)
+     */
+    UBool hasMappings() const { return modified; }
+
+    /**
+     * @return true if c has CEs in this builder
+     */
+    UBool isAssigned(UChar32 c) const;
+
+    /**
+     * @return the three-byte primary if c maps to a single such CE and has no context data,
+     * otherwise returns 0.
+     */
+    uint32_t getLongPrimaryIfSingleCE(UChar32 c) const;
+
+    /**
+     * @return the single CE for c.
+     * Sets an error code if c does not have a single CE.
+     */
+    int64_t getSingleCE(UChar32 c, UErrorCode &errorCode) const;
+
+    void add(const UnicodeString &prefix, const UnicodeString &s,
+             const int64_t ces[], int32_t cesLength,
+             UErrorCode &errorCode);
+
+    /**
+     * Encodes the ces as either the returned ce32 by itself,
+     * or by storing an expansion, with the returned ce32 referring to that.
+     *
+     * add(p, s, ces, cesLength) = addCE32(p, s, encodeCEs(ces, cesLength))
+     */
+    virtual uint32_t encodeCEs(const int64_t ces[], int32_t cesLength, UErrorCode &errorCode);
+    void addCE32(const UnicodeString &prefix, const UnicodeString &s,
+                 uint32_t ce32, UErrorCode &errorCode);
+
+    /**
+     * Sets three-byte-primary CEs for a range of code points in code point order,
+     * if it is worth doing; otherwise no change is made.
+     * None of the code points in the range should have complex mappings so far
+     * (expansions/contractions/prefixes).
+     * @param start first code point
+     * @param end last code point (inclusive)
+     * @param primary primary weight for 'start'
+     * @param step per-code point primary-weight increment
+     * @param errorCode ICU in/out error code
+     * @return true if an OFFSET_TAG range was used for start..end
+     */
+    UBool maybeSetPrimaryRange(UChar32 start, UChar32 end,
+                               uint32_t primary, int32_t step,
+                               UErrorCode &errorCode);
+
+    /**
+     * Sets three-byte-primary CEs for a range of code points in code point order.
+     * Sets range values if that is worth doing, or else individual values.
+     * None of the code points in the range should have complex mappings so far
+     * (expansions/contractions/prefixes).
+     * @param start first code point
+     * @param end last code point (inclusive)
+     * @param primary primary weight for 'start'
+     * @param step per-code point primary-weight increment
+     * @param errorCode ICU in/out error code
+     * @return the next primary after 'end': start primary incremented by ((end-start)+1)*step
+     */
+    uint32_t setPrimaryRangeAndReturnNext(UChar32 start, UChar32 end,
+                                          uint32_t primary, int32_t step,
+                                          UErrorCode &errorCode);
+
+    /**
+     * Copies all mappings from the src builder, with modifications.
+     * This builder here must not be built yet, and should be empty.
+     */
+    void copyFrom(const CollationDataBuilder &src, const CEModifier &modifier,
+                  UErrorCode &errorCode);
+
+    void optimize(const UnicodeSet &set, UErrorCode &errorCode);
+    void suppressContractions(const UnicodeSet &set, UErrorCode &errorCode);
+
+    void enableFastLatin() { fastLatinEnabled = true; }
+    virtual void build(CollationData &data, UErrorCode &errorCode);
+
+    /**
+     * Looks up CEs for s and appends them to the ces array.
+     * Does not handle normalization: s should be in FCD form.
+     *
+     * Does not write completely ignorable CEs.
+     * Does not write beyond Collation::MAX_EXPANSION_LENGTH.
+     *
+     * @return incremented cesLength
+     */
+    int32_t getCEs(const UnicodeString &s, int64_t ces[], int32_t cesLength);
+    int32_t getCEs(const UnicodeString &prefix, const UnicodeString &s,
+                   int64_t ces[], int32_t cesLength);
+
+protected:
+    friend class CopyHelper;
+    friend class DataBuilderCollationIterator;
+
+    uint32_t getCE32FromOffsetCE32(UBool fromBase, UChar32 c, uint32_t ce32) const;
+
+    int32_t addCE(int64_t ce, UErrorCode &errorCode);
+    int32_t addCE32(uint32_t ce32, UErrorCode &errorCode);
+    int32_t addConditionalCE32(const UnicodeString &context, uint32_t ce32, UErrorCode &errorCode);
+
+    inline ConditionalCE32 *getConditionalCE32(int32_t index) const {
+        return static_cast<ConditionalCE32 *>(conditionalCE32s[index]);
+    }
+    inline ConditionalCE32 *getConditionalCE32ForCE32(uint32_t ce32) const {
+        return getConditionalCE32(Collation::indexFromCE32(ce32));
+    }
+
+    static uint32_t makeBuilderContextCE32(int32_t index) {
+        return Collation::makeCE32FromTagAndIndex(Collation::BUILDER_DATA_TAG, index);
+    }
+    static inline UBool isBuilderContextCE32(uint32_t ce32) {
+        return Collation::hasCE32Tag(ce32, Collation::BUILDER_DATA_TAG);
+    }
+
+    static uint32_t encodeOneCEAsCE32(int64_t ce);
+    uint32_t encodeOneCE(int64_t ce, UErrorCode &errorCode);
+    uint32_t encodeExpansion(const int64_t ces[], int32_t length, UErrorCode &errorCode);
+    uint32_t encodeExpansion32(const int32_t newCE32s[], int32_t length, UErrorCode &errorCode);
+
+    uint32_t copyFromBaseCE32(UChar32 c, uint32_t ce32, UBool withContext, UErrorCode &errorCode);
+    /**
+     * Copies base contractions to a list of ConditionalCE32.
+     * Sets cond->next to the index of the first new item
+     * and returns the index of the last new item.
+     */
+    int32_t copyContractionsFromBaseCE32(UnicodeString &context, UChar32 c, uint32_t ce32,
+                                         ConditionalCE32 *cond, UErrorCode &errorCode);
+
+    UBool getJamoCE32s(uint32_t jamoCE32s[], UErrorCode &errorCode);
+    void setDigitTags(UErrorCode &errorCode);
+    void setLeadSurrogates(UErrorCode &errorCode);
+
+    void buildMappings(CollationData &data, UErrorCode &errorCode);
+
+    void clearContexts();
+    void buildContexts(UErrorCode &errorCode);
+    uint32_t buildContext(ConditionalCE32 *head, UErrorCode &errorCode);
+    int32_t addContextTrie(uint32_t defaultCE32, UCharsTrieBuilder &trieBuilder,
+                           UErrorCode &errorCode);
+
+    void buildFastLatinTable(CollationData &data, UErrorCode &errorCode);
+
+    int32_t getCEs(const UnicodeString &s, int32_t start, int64_t ces[], int32_t cesLength);
+
+    static UChar32 jamoCpFromIndex(int32_t i) {
+        // 0 <= i < CollationData::JAMO_CE32S_LENGTH = 19 + 21 + 27
+        if(i < Hangul::JAMO_L_COUNT) { return Hangul::JAMO_L_BASE + i; }
+        i -= Hangul::JAMO_L_COUNT;
+        if(i < Hangul::JAMO_V_COUNT) { return Hangul::JAMO_V_BASE + i; }
+        i -= Hangul::JAMO_V_COUNT;
+        // i < 27
+        return Hangul::JAMO_T_BASE + 1 + i;
+    }
+
+    /** @see Collation::BUILDER_DATA_TAG */
+    static const uint32_t IS_BUILDER_JAMO_CE32 = 0x100;
+
+    const Normalizer2Impl &nfcImpl;
+    const CollationData *base;
+    const CollationSettings *baseSettings;
+    UTrie2 *trie;
+    UVector32 ce32s;
+    UVector64 ce64s;
+    UVector conditionalCE32s;  // vector of ConditionalCE32
+    // Characters that have context (prefixes or contraction suffixes).
+    UnicodeSet contextChars;
+    // Serialized UCharsTrie structures for finalized contexts.
+    UnicodeString contexts;
+private:
+    /**
+     * The "era" of building intermediate contexts.
+     * When the array of cached, temporary contexts overflows, then clearContexts()
+     * removes them all and invalidates the builtCE32 that used to point to built tries.
+     * See ConditionalCE32::era.
+     */
+    int32_t contextsEra = 0;
+protected:
+    UnicodeSet unsafeBackwardSet;
+    UBool modified;
+    UBool icu4xMode;
+
+    UBool fastLatinEnabled;
+    CollationFastLatinBuilder *fastLatinBuilder;
+
+    DataBuilderCollationIterator *collIter;
+};
+
+U_NAMESPACE_END
+
+#endif  // !UCONFIG_NO_COLLATION
+#endif  // __COLLATIONDATABUILDER_H__