frontend/node_modules/apache-arrow/visitor/iterator.mjs

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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.
import { Type } from '../enum';
import { Visitor } from '../visitor';
import { iterateBits } from '../util/bit';
import { instance as getVisitor } from './get';
/** @ignore */
export class IteratorVisitor extends Visitor {
}
/** @ignore */
function nullableIterator(vector) {
    const getFn = getVisitor.getVisitFn(vector);
    return iterateBits(vector.nullBitmap, vector.offset, vector.length, vector, (vec, idx, nullByte, nullBit) => ((nullByte & 1 << nullBit) !== 0) ? getFn(vec, idx) : null);
}
/** @ignore */
function vectorIterator(vector) {
    // If nullable, iterate manually
    if (vector.nullCount > 0) {
        return nullableIterator(vector);
    }
    const { type, typeId, length } = vector;
    // Fast case, defer to native iterators if possible
    if (vector.stride === 1 && ((typeId === Type.Timestamp) ||
        (typeId === Type.Int && type.bitWidth !== 64) ||
        (typeId === Type.Time && type.bitWidth !== 64) ||
        (typeId === Type.Float && type.precision > 0 /* Precision.HALF */))) {
        return vector.values.subarray(0, length)[Symbol.iterator]();
    }
    // Otherwise, iterate manually
    return (function* (getFn) {
        for (let index = -1; ++index < length;) {
            yield getFn(vector, index);
        }
    })(getVisitor.getVisitFn(vector));
}
IteratorVisitor.prototype.visitNull = vectorIterator;
IteratorVisitor.prototype.visitBool = vectorIterator;
IteratorVisitor.prototype.visitInt = vectorIterator;
IteratorVisitor.prototype.visitInt8 = vectorIterator;
IteratorVisitor.prototype.visitInt16 = vectorIterator;
IteratorVisitor.prototype.visitInt32 = vectorIterator;
IteratorVisitor.prototype.visitInt64 = vectorIterator;
IteratorVisitor.prototype.visitUint8 = vectorIterator;
IteratorVisitor.prototype.visitUint16 = vectorIterator;
IteratorVisitor.prototype.visitUint32 = vectorIterator;
IteratorVisitor.prototype.visitUint64 = vectorIterator;
IteratorVisitor.prototype.visitFloat = vectorIterator;
IteratorVisitor.prototype.visitFloat16 = vectorIterator;
IteratorVisitor.prototype.visitFloat32 = vectorIterator;
IteratorVisitor.prototype.visitFloat64 = vectorIterator;
IteratorVisitor.prototype.visitUtf8 = vectorIterator;
IteratorVisitor.prototype.visitBinary = vectorIterator;
IteratorVisitor.prototype.visitFixedSizeBinary = vectorIterator;
IteratorVisitor.prototype.visitDate = vectorIterator;
IteratorVisitor.prototype.visitDateDay = vectorIterator;
IteratorVisitor.prototype.visitDateMillisecond = vectorIterator;
IteratorVisitor.prototype.visitTimestamp = vectorIterator;
IteratorVisitor.prototype.visitTimestampSecond = vectorIterator;
IteratorVisitor.prototype.visitTimestampMillisecond = vectorIterator;
IteratorVisitor.prototype.visitTimestampMicrosecond = vectorIterator;
IteratorVisitor.prototype.visitTimestampNanosecond = vectorIterator;
IteratorVisitor.prototype.visitTime = vectorIterator;
IteratorVisitor.prototype.visitTimeSecond = vectorIterator;
IteratorVisitor.prototype.visitTimeMillisecond = vectorIterator;
IteratorVisitor.prototype.visitTimeMicrosecond = vectorIterator;
IteratorVisitor.prototype.visitTimeNanosecond = vectorIterator;
IteratorVisitor.prototype.visitDecimal = vectorIterator;
IteratorVisitor.prototype.visitList = vectorIterator;
IteratorVisitor.prototype.visitStruct = vectorIterator;
IteratorVisitor.prototype.visitUnion = vectorIterator;
IteratorVisitor.prototype.visitDenseUnion = vectorIterator;
IteratorVisitor.prototype.visitSparseUnion = vectorIterator;
IteratorVisitor.prototype.visitDictionary = vectorIterator;
IteratorVisitor.prototype.visitInterval = vectorIterator;
IteratorVisitor.prototype.visitIntervalDayTime = vectorIterator;
IteratorVisitor.prototype.visitIntervalYearMonth = vectorIterator;
IteratorVisitor.prototype.visitFixedSizeList = vectorIterator;
IteratorVisitor.prototype.visitMap = vectorIterator;
/** @ignore */
export const instance = new IteratorVisitor();

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