1 | package solarsim.common; |
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2 | |
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3 | import java.io.BufferedReader; |
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4 | import solarsim.io.MyInputStreamReader; |
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5 | import solarsim.*; |
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6 | import java.io.ByteArrayInputStream; |
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7 | import java.io.IOException; |
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8 | import java.io.InputStream; |
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9 | import java.io.InputStreamReader; |
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10 | import java.util.*; |
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11 | |
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12 | /** |
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13 | * Clasa care descrie starea sistemului la un moment dat. Contine o lista de obiecte {@link Particle} |
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14 | * care specifica masele, pozitiile si vitezele elementelor sistemului. |
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15 | * @author Marius Ion |
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16 | */ |
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17 | public class State { |
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18 | |
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19 | private enum FP_Precision { |
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20 | FLOAT, DOUBLE; |
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21 | }; |
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22 | |
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23 | private List<Particle> particles; |
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24 | private static final FP_Precision precision = FP_Precision.FLOAT; |
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25 | |
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26 | private State(){} |
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27 | |
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28 | public State(List<Particle> particles) { |
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29 | this.particles = particles; |
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30 | } |
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31 | |
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32 | /** |
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33 | * Metoda statica ce permite citirea starii dintr-un buffer. Starea a fost |
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34 | * scrisa in buffer de catre programul C. |
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35 | * @param inputStream streamul din care se citeste |
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36 | * @return starea sistemului |
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37 | * @throws IOException cand s-a produs o eroare la citirea din InputStream |
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38 | */ |
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39 | public static State readStateFromBuffer(byte[] data, int offset, int length) |
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40 | throws IOException { |
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41 | ByteArrayInputStream ins = new ByteArrayInputStream(data, offset, length); |
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42 | return readStateFromInputStream(ins); |
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43 | } |
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44 | |
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45 | /** |
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46 | * Metoda statica ce permite citirea starii dintr-un InputStream. Starea a fost |
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47 | * scrisa in stream de catre programul C. |
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48 | * @param inputStream streamul din care se citeste |
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49 | * @return starea sistemului |
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50 | * @throws IOException cand s-a produs o eroare la citirea din InputStream |
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51 | */ |
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52 | public static State readStateFromInputStream(InputStream inputStream) |
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53 | throws IOException { |
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54 | State state = new State(); |
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55 | MyInputStreamReader in = new MyInputStreamReader(inputStream); |
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56 | |
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57 | int n = in.readInt(); |
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58 | if( n == 0 ) |
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59 | return null; |
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60 | state.particles = new ArrayList<Particle>(n); |
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61 | for( int i = 0; i < n; i++ ) { |
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62 | state.particles.add(new Particle()); |
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63 | } |
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64 | |
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65 | for( int i = 0; i < n; i++ ) { |
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66 | double mass; |
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67 | if( precision == FP_Precision.DOUBLE ) |
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68 | mass = in.readDouble(); |
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69 | else |
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70 | mass = (double)in.readFloat(); |
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71 | state.particles.get(i).mass = mass; |
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72 | } |
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73 | |
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74 | for( int i = 0; i < n; i++ ) { |
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75 | Vector position; |
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76 | if( precision == FP_Precision.DOUBLE ) |
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77 | position = in.readVector(); |
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78 | else |
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79 | position = in.readFloatVector(); |
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80 | state.particles.get(i).position = position; |
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81 | } |
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82 | |
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83 | for( int i = 0; i < n; i++ ) { |
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84 | Vector velocity; |
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85 | if( precision == FP_Precision.DOUBLE ) |
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86 | velocity = in.readVector(); |
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87 | else |
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88 | velocity = in.readFloatVector(); |
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89 | state.particles.get(i).velocity = velocity; |
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90 | } |
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91 | |
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92 | return state; |
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93 | } |
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94 | |
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95 | /** |
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96 | * Getter pentru particule. |
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97 | * @return lista particulelor din sistem. |
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98 | */ |
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99 | public List<Particle> getParticles() { |
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100 | return particles; |
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101 | } |
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102 | |
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103 | @Override |
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104 | public String toString() { |
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105 | StringBuffer buf = new StringBuffer(); |
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106 | |
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107 | for( int i = 0; i < particles.size(); i++ ) { |
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108 | buf.append("Particle " + i + ":\n"); |
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109 | buf.append("\tmass:" + particles.get(i).mass + "\n"); |
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110 | buf.append("\tposition:" + particles.get(i).position + "\n"); |
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111 | buf.append("\tvelocity:" + particles.get(i).velocity + "\n"); |
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112 | buf.append("\n"); |
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113 | } |
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114 | |
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115 | return buf.toString(); |
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116 | } |
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117 | |
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118 | } |
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