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QuestDB is high performance SQL time series database
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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2024 QuestDB
 *
 *  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.
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package io.questdb.std.str;

import io.questdb.std.MemoryTag;
import io.questdb.std.Unsafe;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.annotations.TestOnly;

import java.io.Closeable;

public class DirectUtf16Sink implements MutableUtf16Sink, DirectCharSequence, Closeable, Utf16Sink {
    private final long initialCapacity;
    private long capacity;
    private long hi;
    private long lo;
    private long ptr;
    private FloatingCharSequence subSequence;

    public DirectUtf16Sink(long capacity) {
        ptr = Unsafe.malloc(capacity, MemoryTag.NATIVE_DIRECT_CHAR_SINK);
        this.capacity = capacity;
        this.initialCapacity = capacity;
        this.lo = ptr;
        this.hi = ptr + capacity;
    }

    @Override
    public char charAt(int index) {
        return Unsafe.getUnsafe().getChar(ptr + index * 2L);
    }

    @Override
    public void clear() {
        lo = ptr;
    }

    @Override
    public void close() {
        ptr = Unsafe.free(ptr, capacity, MemoryTag.NATIVE_DIRECT_CHAR_SINK);
    }

    @TestOnly
    public long getCapacity() {
        return capacity;
    }

    @Override
    public int length() {
        return (int) (lo - ptr) / 2;
    }

    @Override
    public long ptr() {
        return ptr;
    }

    @Override
    public Utf16Sink put(@Nullable CharSequence cs) {
        if (cs != null) {
            int l = cs.length();
            int l2 = l * 2;
            if (lo + l2 >= hi) {
                resize(Math.max(capacity * 2L, (lo - ptr + l2) * 2L));
            }
            for (int i = 0; i < l; i++) {
                Unsafe.getUnsafe().putChar(lo + i * 2L, cs.charAt(i));
            }
            this.lo += l2;
        }
        return this;
    }

    @Override
    public Utf16Sink put(char c) {
        if (lo == hi) {
            resize(this.capacity * 2);
        }
        Unsafe.getUnsafe().putChar(lo, c);
        lo += 2;
        return this;
    }

    @Override
    public Utf16Sink put(char @NotNull [] chars, int start, int len) {
        int l2 = len * 2;
        if (lo + l2 >= hi) {
            resize((int) Math.max(capacity * 2L, (lo - ptr + l2) * 2L));
        }
        for (int i = 0; i < len; i++) {
            Unsafe.getUnsafe().putChar(lo + i * 2L, chars[i + start]);
        }
        this.lo += l2;
        return this;
    }

    public Utf16Sink putAscii(@NotNull Utf8Sequence us) {
        int l = us.size();
        int l2 = l * 2;
        if (lo + l2 >= hi) {
            resize(Math.max(capacity * 2L, (lo - ptr + l2) * 2L));
        }
        for (int i = 0; i < l; i++) {
            Unsafe.getUnsafe().putChar(lo + i * 2L, (char) us.byteAt(i));
        }
        this.lo += l2;
        return this;
    }

    public void resetCapacity() {
        resize(initialCapacity);
        clear();
    }

    @Override
    public int size() {
        return (int) (lo - ptr);
    }

    @Override
    public @NotNull CharSequence subSequence(int start, int end) {
        if (subSequence == null) {
            subSequence = new FloatingCharSequence();
        }
        return subSequence.of(start, end - start);
    }

    @NotNull
    @Override
    public String toString() {
        return AbstractCharSequence.getString(this);
    }

    private void resize(long cap) {
        long temp = Unsafe.realloc(ptr, capacity, cap, MemoryTag.NATIVE_DIRECT_CHAR_SINK);
        int len = (int) (lo - ptr);
        this.ptr = temp;
        this.capacity = cap;
        this.lo = ptr + len;
        this.hi = ptr + cap;
    }

    private class FloatingCharSequence extends AbstractCharSequence {
        private int len;
        private int startIndex;

        @Override
        public char charAt(int index) {
            return Unsafe.getUnsafe().getChar(ptr + (startIndex + index) * 2L);
        }

        @Override
        public int length() {
            return len;
        }

        CharSequence of(int startIndex, int len) {
            this.startIndex = startIndex;
            this.len = len;
            return this;
        }
    }
}