| /* |
| * 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. |
| */ |
| package com.esri.core.geometry; |
| |
| import java.nio.ByteBuffer; |
| import java.nio.ByteOrder; |
| |
| public class ShapefileByteBufferCursor extends ByteBufferCursor { |
| ByteBuffer fileBuffer; |
| int headerOffset = 100; |
| int currOffset = headerOffset; //skip shp header |
| int fileLen; |
| int recordIndex = 0; |
| |
| public ShapefileByteBufferCursor(ByteBuffer buffer) { |
| this.fileBuffer = buffer; |
| |
| fileBuffer.order(ByteOrder.BIG_ENDIAN); |
| int fileLengthWords = fileBuffer.getInt(24); // length in 16bit words |
| fileLen = fileLengthWords * 2; |
| } |
| |
| @Override |
| public int getByteBufferID() { |
| return recordIndex; |
| } |
| |
| @Override |
| public ByteBuffer next() { |
| ByteBuffer shpGeometryRow = getSingleRowFromShp(); |
| return shpGeometryRow; |
| } |
| |
| private ByteBuffer getSingleRowFromShp() { |
| fileBuffer.order(ByteOrder.BIG_ENDIAN); |
| ByteBuffer shapeBuffer = null; |
| |
| if (currOffset < fileLen) { |
| fileBuffer.order(ByteOrder.BIG_ENDIAN); |
| recordIndex = fileBuffer.getInt(currOffset); |
| int contentLen = fileBuffer.getInt(currOffset + 4) * 2; |
| fileBuffer.order(ByteOrder.LITTLE_ENDIAN); |
| byte[] dstArr = new byte[contentLen]; |
| |
| fileBuffer.position(currOffset + 8); // skip record header |
| fileBuffer.get(dstArr, 0, contentLen); |
| |
| shapeBuffer = ByteBuffer.wrap(dstArr); |
| shapeBuffer.order(ByteOrder.LITTLE_ENDIAN); |
| |
| int tmpPos = shapeBuffer.position(); |
| shapeBuffer.position(tmpPos); |
| currOffset = currOffset + 8 + contentLen; // skip rec header and go to next rec |
| } |
| return shapeBuffer; |
| } |
| } |