io.questdb.std.str.FloatingDirectCharSink Maven / Gradle / Ivy

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/*******************************************************************************
 *     ___                  _   ____  ____
 *    / _ \ _   _  ___  ___| |_|  _ \| __ )
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 *
 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2020 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.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
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package io.questdb.std.str;

import java.io.Closeable;

import org.jetbrains.annotations.NotNull;

import io.questdb.std.Chars;
import io.questdb.std.Mutable;
import io.questdb.std.Unsafe;

public class FloatingDirectCharSink extends AbstractCharSink implements CharSequence, Closeable, Mutable {
    private long ptr;
    private long lo;
    private long hi;

    public FloatingDirectCharSink() {
        lo = hi = ptr = 0;
    }

    public FloatingDirectCharSink of(long lo, long hi) {
        this.ptr = lo;
        this.lo = lo;
        this.hi = hi;

        return this;
    }

    public FloatingDirectCharSink asCharSequence(long lo, long hi) {
        this.ptr = lo;
        this.lo = hi;
        this.hi = hi;

        return this;
    }

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

    @Override
    public void close() {
        lo = hi = ptr = 0;
    }

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

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

    @Override
    public CharSequence subSequence(int start, int end) {
        throw new UnsupportedOperationException();
    }

    @Override
    public CharSink put(CharSequence cs) {
        int l = cs.length();
        assert checkCapacity(l);
        int l2 = l * 2;
        for (int i = 0; i < l; i++) {
            Unsafe.getUnsafe().putChar(lo + i * 2L, cs.charAt(i));
        }
        this.lo += l2;
        return this;
    }

    @Override
    public CharSink put(char[] chars, int start, int len) {
        assert checkCapacity(len);
        int l2 = len * 2;
        for (int i = 0; i < len; i++) {
            Unsafe.getUnsafe().putChar(lo + i * 2L, chars[i + start]);
        }

        this.lo += l2;
        return this;
    }

    @Override
    public CharSink put(char c) {
        assert checkCapacity(1);
        Unsafe.getUnsafe().putChar(lo, c);
        lo += 2;
        return this;
    }

    private boolean checkCapacity(int nChars) {
        return lo + (2L * nChars) <= hi;
    }

    @Override
    public int hashCode() {
        return Chars.hashCode(this);
    }

    @Override
    public boolean equals(Object obj) {
        return this == obj || obj instanceof CharSequence && Chars.equals(this, (CharSequence) obj);
    }

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