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MutableHit.java
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MutableHit.java
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/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.index.gbptree;
import org.neo4j.index.Hit;
/**
* Straight-forward implement of {@link Hit} where focus is on zero garbage. This instances can be used
* for multiple hits. Key/value instances are provided, its values overwritten for every hit and
* merely be exposed in {@link #key()} and {@link #value()}, where caller must adhere to not keeping
* references to those instances after reading them.
*
* @param <KEY> type of key
* @param <VALUE> type of value
*/
public class MutableHit<KEY,VALUE> implements Hit<KEY,VALUE>
{
private final KEY key;
private final VALUE value;
/**
* Constructs a new {@link MutableHit} where the provided {@code key} and {@code value} are single
* instances to be re-used and overwritten for every hit in a result set.
*
* @param key KEY instance to reuse for every hit.
* @param value VALUE instance to reuse for every hit.
*/
public MutableHit( KEY key, VALUE value )
{
this.key = key;
this.value = value;
}
/**
* @return key instance containing current key. This instance will have its value overwritten for next
* hit and so no reference to the returned instances must be kept after reading it.
*/
@Override
public KEY key()
{
return key;
}
/**
* @return value instance containing current value. This instance will have its value overwritten for next
* hit and so no reference to the returned instances must be kept after reading it.
*/
@Override
public VALUE value()
{
return value;
}
@Override
public String toString()
{
return "[key:" + key + ", value:" + value + "]";
}
}