// 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 { Visitor } from '../visitor.mjs';
import { Type, Precision } from '../enum.mjs';
import { Float, Int, Time, } from '../type.mjs';
import { ChunkedIterator } from '../util/chunk.mjs';
/** @ignore */
export class IteratorVisitor extends Visitor {
}
/** @ignore */
function vectorIterator(vector) {
    const { type } = vector;
    // Fast case, defer to native iterators if possible
    if (vector.nullCount === 0 && vector.stride === 1 && ((type.typeId === Type.Timestamp) ||
        (type instanceof Int && type.bitWidth !== 64) ||
        (type instanceof Time && type.bitWidth !== 64) ||
        (type instanceof Float && type.precision !== Precision.HALF))) {
        return new ChunkedIterator(vector.data.length, (chunkIndex) => {
            const data = vector.data[chunkIndex];
            return data.values.subarray(0, data.length)[Symbol.iterator]();
        });
    }
    // Otherwise, iterate manually
    let offset = 0;
    return new ChunkedIterator(vector.data.length, (chunkIndex) => {
        const data = vector.data[chunkIndex];
        const length = data.length;
        const inner = vector.slice(offset, offset + length);
        offset += length;
        return new VectorIterator(inner);
    });
}
/** @ignore */
class VectorIterator {
    constructor(vector) {
        this.vector = vector;
        this.index = 0;
    }
    next() {
        if (this.index < this.vector.length) {
            return {
                value: this.vector.get(this.index++)
            };
        }
        return { done: true, value: null };
    }
    [Symbol.iterator]() {
        return this;
    }
}
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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