98 lines
3.0 KiB
Java
98 lines
3.0 KiB
Java
package envoy.event;
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import envoy.data.Contact;
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import envoy.data.Group;
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import envoy.data.User;
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/**
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* This event is used to communicate changes in the group size between client
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* and server.<br>
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* Possible actions are adding or removing certain {@link User}s to or from a
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* certain {@link Group}
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* <br>
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* Project: <strong>envoy-common</strong><br>
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* File: <strong>GroupResizeEvent.java</strong><br>
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* Created: <strong>25 Mar 2020</strong><br>
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*
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* @author Leon Hofmeister
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* @since Envoy Common v0.1-beta
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*/
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public class GroupResizeEvent extends Event<Long> {
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private final long groupID;
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private OperationType operationType;
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private static final long serialVersionUID = 0L;
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/**
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* This enum defines all possibilities for handling
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* {@link GroupResizeEvent}s.<br>
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* These can be: {@link OperationType#ADD} or {@link OperationType#REMOVE}.<br>
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* <br>
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* Project: <strong>envoy-common</strong><br>
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* File: <strong>GroupResizeEvent.java</strong><br>
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* Created: <strong>25 Mar 2020</strong><br>
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*
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* @author Leon Hofmeister
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* @since Envoy Common v0.1-beta
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*/
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public enum OperationType {
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/**
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* Select this element, if the given {@link User} should be added to the given
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* {@link Group}
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*/
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ADD,
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/**
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* Select this element, if the given {@link User} should be removed from the
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* given {@link Group}
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*/
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REMOVE
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}
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/**
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* Initializes a {@link GroupResizeEvent} through a Contact where the name has
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* already been set.
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*
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* @param user the {@link User} who wants to join or leave a group
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* @param group the {@link Group} he wants to join or leave
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* @param operationType whether the user should be removed from this group. If
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* false,
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* this user will be added
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* @since Envoy Common v0.2-alpha
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*/
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public GroupResizeEvent(User user, Group group, OperationType operationType) {
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super(user.getID());
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if (group.getMemberIDs().contains(user.getID())) {
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if (operationType.equals(OperationType.ADD)) throw new IllegalStateException(
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"Cannot add " + user + " to group " + group.getID() + " because he is already a member of this group");
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} else if (operationType.equals(OperationType.REMOVE))
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throw new IllegalStateException("Cannot remove " + user + " from group " + group.getID() + " because he is no part of this group");
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groupID = group.getID();
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this.operationType = operationType;
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}
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/**
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* @return the ID of the {@link Contact} this event is related to
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* @since Envoy Common v0.2-alpha
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*/
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public long getGroupId() { return groupID; }
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/**
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* @return the operationType
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* @since Envoy Common v0.1-beta
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*/
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public OperationType getOperationType() { return operationType; }
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/**
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* @param operationType the operationType to set
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* @since Envoy Common v0.1-beta
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*/
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public void setOperationType(OperationType operationType) { this.operationType = operationType; }
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/**
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* {@inheritDoc}
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*/
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@Override
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public String toString() { return String.format("GroupResizeEvent[userid=%d,groupid=%d,operationType=%b]", get(), groupID, operationType); }
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}
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