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Copyright (C) 2011 the original author or authors. See the notice.md file distributed with this work for additional information regarding copyright ownership. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
package org.iq80.leveldb.impl;
public class SnapshotImpl implements Snapshot
    private final AtomicBoolean closed = new AtomicBoolean();
    private final Version version;
    private final long lastSequence;
    SnapshotImpl(Version versionlong lastSequence)
    {
        this. = version;
        this. = lastSequence;
        this..retain();
    }
    @Override
    public void close()
    {
        // This is an end user API.. he might screw up and close multiple times.
        // but we don't want the version reference count going bad.
        if(.compareAndSet(falsetrue)) {
            this..release();
        }
    }
    public long getLastSequence() {
        return ;
    }
    public Version getVersion() {
        return ;
    }
    @Override
    public String toString() {
        return Long.toString();
    }
    @Override
    public boolean equals(Object o) {
        if (this == oreturn true;
        if (o == null || getClass() != o.getClass()) return false;
        SnapshotImpl snapshot = (SnapshotImplo;
        if ( != snapshot.lastSequencereturn false;
        if (!.equals(snapshot.version)) return false;
        return true;
    }
    @Override
    public int hashCode() {
        int result = .hashCode();
        result = 31 * result + (int) ( ^ ( >>> 32));
        return result;
    }
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