/
FeatureTable.ts
166 lines (106 loc) · 4.19 KB
/
FeatureTable.ts
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import { arrayToString } from './arrayToString.js';
export class FeatureTable {
private buffer: any;
private binOffset: any;
private binLength: any;
private header: any;
constructor( buffer, start, headerLength, binLength ) {
this.buffer = buffer;
this.binOffset = start + headerLength;
this.binLength = binLength;
let header = null;
if ( headerLength !== 0 ) {
const headerData = new Uint8Array( buffer, start, headerLength );
header = JSON.parse( arrayToString( headerData ) );
} else {
header = {};
}
this.header = header;
}
getKeys() {
return Object.keys( this.header );
}
getData( key, count?, defaultComponentType = null, defaultType = null ) {
const header = this.header;
if ( ! ( key in header ) ) {
return null;
}
const feature = header[ key ];
if ( ! ( feature instanceof Object ) ) {
return feature;
} else if ( Array.isArray( feature ) ) {
return feature;
} else {
const { buffer, binOffset, binLength } = this;
const byteOffset = feature.byteOffset || 0;
const featureType = feature.type || defaultType;
const featureComponentType = feature.componentType || defaultComponentType;
if ( 'type' in feature && defaultType && feature.type !== defaultType ) {
throw new Error( 'FeatureTable: Specified type does not match expected type.' );
}
let stride;
switch ( featureType ) {
case 'SCALAR':
stride = 1;
break;
case 'VEC2':
stride = 2;
break;
case 'VEC3':
stride = 3;
break;
case 'VEC4':
stride = 4;
break;
default:
throw new Error( `FeatureTable : Feature type not provided for "${ key }".` );
}
let data;
const arrayStart = binOffset + byteOffset;
const arrayLength = count * stride;
switch ( featureComponentType ) {
case 'BYTE':
data = new Int8Array( buffer, arrayStart, arrayLength );
break;
case 'UNSIGNED_BYTE':
data = new Uint8Array( buffer, arrayStart, arrayLength );
break;
case 'SHORT':
data = new Int16Array( buffer, arrayStart, arrayLength );
break;
case 'UNSIGNED_SHORT':
data = new Uint16Array( buffer, arrayStart, arrayLength );
break;
case 'INT':
data = new Int32Array( buffer, arrayStart, arrayLength );
break;
case 'UNSIGNED_INT':
data = new Uint32Array( buffer, arrayStart, arrayLength );
break;
case 'FLOAT':
data = new Float32Array( buffer, arrayStart, arrayLength );
break;
case 'DOUBLE':
data = new Float64Array( buffer, arrayStart, arrayLength );
break;
default:
throw new Error( `FeatureTable : Feature component type not provided for "${ key }".` );
}
const dataEnd = arrayStart + arrayLength * data.BYTES_PER_ELEMENT;
if ( dataEnd > binOffset + binLength ) {
throw new Error( 'FeatureTable: Feature data read outside binary body length.' );
}
return data;
}
}
}
export class BatchTable extends FeatureTable {
private batchSize: any;
constructor( buffer, batchSize, start, headerLength, binLength ) {
super( buffer, start, headerLength, binLength );
this.batchSize = batchSize;
}
getData( key, componentType = null, type = null ) {
return super.getData( key, this.batchSize, componentType, type );
}
}