SnapshotVersionHistoryEntry.java

package com.github.ruediste1.btrbck.dom;

import java.util.UUID;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;

import com.google.common.base.Objects;

/**
 * Entry in the {@link VersionHistory} recording that a snapshot has been taken.
 * The entry can represent multiple snapshots, as long as they are taken from
 * the same stream (by {@link Stream#id})
 */
@XmlRootElement(name = "snapshot")
public class SnapshotVersionHistoryEntry extends VersionHistoryEntry {
    private static final long serialVersionUID = 1L;

    /**
     * Number of snapshots this entry represents
     */
    @XmlAttribute
    public int count = 1;

    public SnapshotVersionHistoryEntry() {

    }

    public SnapshotVersionHistoryEntry(UUID streamId) {
        super(streamId);
    }

    @Override
    public int getRepresentedSnapshotCount() {
        return count;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (obj.getClass() != getClass()) {
            return false;
        }
        SnapshotVersionHistoryEntry other = (SnapshotVersionHistoryEntry) obj;
        return streamId.equals(other.streamId) && count == other.count;
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(streamId, count);
    }

    @Override
    public String toString() {
        return "(Snapshot: " + streamId + " count: " + count + ")";
    }
}