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finished component: IdentifierComponent
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@@ -8,9 +8,9 @@ package component;
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* @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
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*/
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import encoding.Block;
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import encoding.Encoder;
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import encoding.IEncodingAble;
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import encoding.*;
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import util.ByteHelper;
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import util.StringHelper;
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// @Description:
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// 1. 参考 => https://named-data.net/doc/tech-memos/naming-conventions.pdf ，借鉴但不是按这个实现的
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@@ -25,23 +25,201 @@ import encoding.IEncodingAble;
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// 0x01 非负整数（可以用1、2、4、8个字节表示）
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// 0x02 任意字节数组
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public class IdentifierComponent implements TlvComponentBase, IEncodingAble {
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private Block block;
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private Block identifierBlock; // IdentifierComponent数据以TLV形式存储下来
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private byte marker; // 标记 => 用来区分不同类型的 IdentifierComponent
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private String stringValue; // 如果 Marker == 0x00，则本组件存储一个字符串
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private long intValue; // 如果 Marker == 0x01，则本组件存储一个非负整型
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private byte[] byteArrayValue; // 如果 Marker == 0x02，则本组件存储一个字节数组
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public static final byte MarkerString = 0x00;
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public static final byte MarkerNonNegativeInteger = 0x01;
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public static final byte MarkerByteArray = 0x02;
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private static final byte MarkerString = 0x00;
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private static final byte MarkerNonNegativeInteger = 0x01;
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private static final byte MarkerByteArray = 0x02;
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/**
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* 用于判断某个字节是否在已分配的Marker列表当中
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* @param marker
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* @return
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*/
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private boolean isInMarker(byte marker){
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if((marker==MarkerString)||(marker==MarkerNonNegativeInteger)||(marker==MarkerByteArray)){
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return true;
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}else{
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return false;
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}
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}
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/**
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* 根据一个字符串构造一个 IdentifierComponent
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* @param nameComponent
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*/
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public IdentifierComponent(String nameComponent){
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this.identifierBlock=new Block();
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this.identifierBlock.setType(new VlInt(TLV.TlvIdentifierComponent));
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this.identifierBlock.setLength(new VlInt(nameComponent.length()+1));
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byte[] value=new byte[this.identifierBlock.getLength().getVlIntValue2Int()];
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value[0]=MarkerString;
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System.arraycopy(nameComponent.getBytes(),0,value,1,nameComponent.getBytes().length);
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this.identifierBlock.setValue(value);
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this.marker=MarkerString;
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this.stringValue=nameComponent;
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}
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/**
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* 根据一个非负整数构造一个 IdentifierComponent
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* @param intValue
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*/
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public IdentifierComponent(long intValue){
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this.identifierBlock=new Block();
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this.identifierBlock.setType(new VlInt(TLV.TlvIdentifierComponent));
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this.identifierBlock.setLength(new VlInt(new VlInt(intValue).size()+1));
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byte[] value=new byte[this.identifierBlock.getLength().getVlIntValue2Int()];
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value[0]=MarkerNonNegativeInteger;
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System.arraycopy(new VlInt(intValue).getVlIntBytes(),0,value,1,new VlInt(intValue).size());
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this.identifierBlock.setValue(value);
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this.marker=MarkerNonNegativeInteger;
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this.intValue=intValue;
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}
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/**
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* 根据一个字节数组构造一个 IdentifierComponent
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* @param arr
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*/
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public IdentifierComponent(byte[] arr){
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this.identifierBlock=new Block();
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this.identifierBlock.setType(new VlInt(TLV.TlvIdentifierComponent));
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this.identifierBlock.setLength(new VlInt(arr.length+1));
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byte[] value=new byte[this.identifierBlock.getLength().getVlIntValue2Int()];
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value[0]=MarkerByteArray;
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System.arraycopy(arr,0,value,1,arr.length);
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this.identifierBlock.setValue(value);
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this.marker=MarkerByteArray;
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this.byteArrayValue=arr;
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}
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/**
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* 根据一个 TLV Block 创建一个 IdentifierComponent
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* @param block
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* @return
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*/
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public static IdentifierComponent createIdentifierComponentByBlock(Block block){
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IdentifierComponent identifierComponent=new IdentifierComponent(0);
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identifierComponent.wireDecode(block);
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return identifierComponent;
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}
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/**
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* 以字符串形式获取本 IdentifierComponent 的值
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* @return
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*/
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public String getString(){
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return this.stringValue;
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}
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/**
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* 以非负整数的形式获取本 IdentifierComponent 的值
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* @return
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*/
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public long getNonNegativeInteger(){
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return this.intValue;
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}
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/**
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* 以字节数组的形式获取本 IdentifierComponent 的值
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* @return
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*/
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public byte[] getByteArray(){
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return this.byteArrayValue;
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}
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/**
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* 判断当前 IdentifierComponent 是否是存储字符串的类型
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* @return
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*/
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public boolean isString(){
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return this.marker==MarkerString;
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}
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/**
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* 判断当前 IdentifierComponent 是否是存储非负整数的类型
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* @return
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*/
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public boolean isNonNegativeInteger(){
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return this.marker==MarkerNonNegativeInteger;
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}
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/**
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* 判断当前 IdentifierComponent 是否是存储字节数组的类型
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* @return
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*/
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public boolean isByteArray(){
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return this.marker==MarkerByteArray;
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}
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/**
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* 线速编码，将 IdentifierComponent 编码成网络中传输的字节数组格式
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* @param encoder
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* @return
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*/
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@Override
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public int wireEncode(Encoder encoder) {
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return 0;
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return this.identifierBlock.encode(encoder);
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}
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/**
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* 线速解码，将TLV Block解码成 IdentifierComponent
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* @param block
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* @return
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*/
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@Override
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public boolean wireDecode(Block block) {
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return false;
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this.identifierBlock=new Block(block);
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//todo:越界问题
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int length=this.identifierBlock.getLength().getVlIntValue2Int();
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byte[] value=this.identifierBlock.getValue();
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// 要求TLV-LENGTH至少为1，因为 IdentifierComponent 使用 TLV-VALUE 中的第一个字节作为Marker
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if(length<1){
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return false;
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}
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// 判断Marker是否有效
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if(!isInMarker(value[0])){
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return false;
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}
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this.marker=value[0];
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// 根据不同类型的Marker，给不同的成员赋值
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byte[] v=ByteHelper.getTailBytes(value,1);
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if(isString()){
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this.stringValue=new String(v);
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}else if(isNonNegativeInteger()){
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// 如果Marker指定是非负整型，则TLV-LENGTH的有效值为2、3、5、9
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if((length!=2)&&(length!=3)&&(length!=5)&&(length!=9)){
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return false;
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}
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this.intValue=TLV.readNonNegativeInteger(v,0,v.length);
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}else{ // byte[]
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this.byteArrayValue=v;
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}
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return true;
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}
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/**
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* 将 IdentifierComponent 使用百分号编码规则编码
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* @return
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*/
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public String toUri(){
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if(isString()){
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return StringHelper.escape(this.stringValue);
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}else if(isNonNegativeInteger()){
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// return StringHelper.FormatUint(this.intValue,10);
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// todo: 需要对long类型按照指定编码规则编码成字符串
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return "";
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}else{
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return StringHelper.escape(new String(this.byteArrayValue));
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}
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}
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}
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