1 | package de.ugoe.cs.quest.eventcore;
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2 |
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3 | import java.io.Serializable;
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4 | import java.security.InvalidParameterException;
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5 | import java.util.LinkedList;
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6 | import java.util.List;
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7 |
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8 | /**
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9 | * <p>
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10 | * Base class for all events. An event is described by its {@link #type} and its {@link #target}.
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11 | * </p>
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12 | *
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13 | * @author Steffen Herbold
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14 | * @version 1.0
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15 | *
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16 | * @param <T>
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17 | * Can be used to declare that events belong to a specific platform without subclassing.
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18 | */
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19 | public class Event implements Serializable {
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20 |
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21 | /**
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22 | * Id for object serialization.
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23 | */
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24 | private static final long serialVersionUID = 1L;
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25 |
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26 | /**
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27 | * <p>
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28 | * Global start event that can be used to indicate the start of a sequence.
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29 | * </p>
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30 | */
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31 | public static final Event STARTEVENT = new Event(new StringEventType("START"));
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32 |
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33 | /**
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34 | * <p>
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35 | * Global end event that can be used to indicate the end of a sequence.
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36 | */
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37 | public static final Event ENDEVENT = new Event(new StringEventType("END"));
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38 |
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39 | /**
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40 | * <p>
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41 | * Type of the event.
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42 | * </p>
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43 | */
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44 | protected IEventType type;
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45 |
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46 | /**
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47 | * </p> Target of the event.
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48 | */
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49 | protected IEventTarget target = null;
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50 |
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51 | /**
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52 | * <p>
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53 | * List of {@link IReplayable}s of type T that describes the replay of an event. The
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54 | * {@link IReplayable}s can be interpreted as <it>sub-events</it> on the platform level that
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55 | * make up the abstract event.
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56 | * </p>
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57 | */
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58 | protected List<IReplayable> replay = new LinkedList<IReplayable>();
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59 |
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60 | /**
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61 | * <p>
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62 | * Constructor. Creates a new Event with a given type. The type must not be null.
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63 | * </p>
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64 | *
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65 | * @param type
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66 | * type of the event
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67 | */
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68 | public Event(IEventType type) {
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69 | if (type == null) {
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70 | throw new InvalidParameterException("Event type must not be null");
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71 | }
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72 | this.type = type;
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73 | }
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74 |
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75 | /**
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76 | * <p>
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77 | * Constructor. Creates a new Event with a given type and target. The type must not be null.
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78 | * </p>
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79 | *
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80 | * @param type
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81 | * type of the event
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82 | * @param target
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83 | * target of the event
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84 | */
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85 | public Event(IEventType type, IEventTarget target) {
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86 | this(type);
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87 | this.target = target;
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88 | }
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89 |
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90 | /**
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91 | * <p>
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92 | * Two events are equal, if their {@link #type} and {@link #target} are equal.
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93 | * </p>
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94 | * <p>
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95 | * See {@link Object#equals(Object)} for further information.
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96 | * </p>
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97 | *
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98 | * @param other
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99 | * Event that is compared to this
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100 | * @return true, if events are equal, false otherwise
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101 | */
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102 | @Override
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103 | public boolean equals(Object other) {
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104 | if (this == other) {
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105 | return true;
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106 | }
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107 | if (other instanceof Event) {
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108 | Event otherEvent = (Event) other;
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109 | if (target != null) {
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110 | return type.equals(otherEvent.type) && target.equals(otherEvent.target);
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111 | }
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112 | else {
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113 | return type.equals(otherEvent.type) && otherEvent.target == null;
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114 | }
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115 | }
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116 | return false;
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117 | }
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118 |
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119 | /**
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120 | * <p>
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121 | * Returns {@link #getId()} as String representation of the event.
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122 | * </p>
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123 | *
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124 | * @return String representation of the event
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125 | */
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126 | @Override
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127 | public String toString() {
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128 | return getId();
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129 | }
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130 |
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131 | /**
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132 | * <p>
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133 | * Returns the {@link #target} of the event.
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134 | * </p>
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135 | *
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136 | * @return {@link #target} of the event
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137 | */
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138 | public IEventTarget getTarget() {
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139 | return target;
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140 | }
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141 |
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142 | /**
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143 | * <p>
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144 | * Returns the {@link #type} of the event.
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145 | * </p>
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146 | *
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147 | * @return {@link #type} of the event
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148 | */
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149 | public IEventType getType() {
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150 | return type;
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151 | }
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152 |
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153 | /**
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154 | * <p>
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155 | * Returns the combination of {@link #type} and {@link #target} as id.
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156 | * </p>
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157 | *
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158 | * @return string of the form (type,target)
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159 | */
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160 | public String getId() {
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161 | String id = type.toString();
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162 | if( target!=null ) {
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163 | id += "." + target.toString();
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164 | }
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165 | return id;
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166 | }
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167 |
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168 | /*
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169 | * (non-Javadoc)
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170 | *
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171 | * @see java.lang.Object#hashCode()
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172 | */
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173 | @Override
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174 | public int hashCode() {
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175 | int multiplier = 17;
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176 | int hash = 42;
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177 | if (type != null) {
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178 | hash = multiplier * hash + type.hashCode();
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179 | }
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180 | if (target != null) {
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181 | hash = multiplier * hash + target.hashCode();
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182 | }
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183 | return hash;
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184 | }
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185 |
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186 | /**
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187 | * <p>
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188 | * Sets the target of the event. Once set, the target cannot be changed.
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189 | * </p>
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190 | *
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191 | * @param target
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192 | * target of the event
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193 | * @return true, if target was changed, false otherwise
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194 | */
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195 | public boolean setTarget(IEventTarget target) {
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196 | if (this.target != null) {
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197 | return false;
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198 | }
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199 | this.target = target;
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200 | return true;
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201 | }
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202 |
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203 | /**
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204 | * <p>
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205 | * Adds a new {@link IReplayable} of type T to the replay sequence.
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206 | * </p>
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207 | *
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208 | * @param replayable
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209 | * element that is added to the sequence
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210 | * @throws InvalidParameterException
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211 | * thrown is replayable is null
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212 | */
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213 | public void addReplayable(IReplayable replayable) {
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214 | if (replayable == null) {
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215 | throw new InvalidParameterException("replayble must not be null");
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216 | }
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217 | replay.add(replayable);
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218 | }
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219 |
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220 | /**
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221 | * <p>
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222 | * Adds a {@link List}ist of {@link IReplayable} to the replay sequence.
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223 | * </p>
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224 | *
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225 | * @param generatedReplaySeq
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226 | * {@link List} that is added to the sequence
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227 | * @throws InvalidParameterException
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228 | * thrown if generatedReplaySeq is null
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229 | */
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230 | public void addReplayableSequence(List<? extends IReplayable> generatedReplaySeq) {
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231 | if (generatedReplaySeq == null) {
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232 | throw new InvalidParameterException("generatedReplaySeq must not be null");
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233 | }
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234 | replay.addAll(generatedReplaySeq);
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235 | }
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236 |
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237 | /**
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238 | * <p>
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239 | * Returns a the list of replay events.
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240 | * </p>
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241 | * <p>
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242 | * The return value is a copy of the list used internally!
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243 | * </p>
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244 | *
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245 | * @return list of replay events.
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246 | */
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247 | public List<IReplayable> getReplayables() {
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248 | return new LinkedList<IReplayable>(replay);
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249 | }
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250 | }
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