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LabelSet.java
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LabelSet.java
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/*
* Copyright (c) 2002-2017 "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.values.virtual;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Iterator;
import org.neo4j.values.AnyValue;
import org.neo4j.values.AnyValueWriter;
import org.neo4j.values.AnyValues;
import org.neo4j.values.TextValue;
import org.neo4j.values.VirtualValue;
import static org.neo4j.values.virtual.ArrayHelpers.asIterator;
import static org.neo4j.values.virtual.ArrayHelpers.isSortedSet;
import static org.neo4j.values.virtual.VirtualValueGroup.LABEL_SET;
public abstract class LabelSet extends VirtualValue implements Iterable<TextValue>
{
public abstract int size();
/**
* This implementation is assuming that the label set is fairly
* small, maintains a sorted set of labels.
*/
static class ArrayBasedLabelSet extends LabelSet
{
private final TextValue[] labels;
ArrayBasedLabelSet( TextValue[] labels )
{
assert labels != null;
this.labels = new TextValue[labels.length];
System.arraycopy( labels, 0, this.labels, 0, this.labels.length );
Arrays.sort( this.labels, AnyValues.COMPARATOR );
assert isSortedSet( this.labels, AnyValues.COMPARATOR );
}
@Override
public <E extends Exception> void writeTo( AnyValueWriter<E> writer ) throws E
{
writer.beginLabels( labels.length );
for ( TextValue label : labels )
{
label.writeTo( writer );
}
writer.endLabels();
}
@Override
public int hash()
{
return Arrays.hashCode( labels );
}
@Override
public boolean equals( VirtualValue other )
{
if ( !(other instanceof LabelSet) )
{
return false;
}
if ( labels.length != ((LabelSet) other).size() )
{
return false;
}
if ( other instanceof ArrayBasedLabelSet )
{ //fast route
ArrayBasedLabelSet that = (ArrayBasedLabelSet) other;
for ( int i = 0; i < labels.length; i++ )
{
if ( !labels[i].equals( that.labels[i] ) )
{
return false;
}
}
return true;
}
else
{ //slow route
LabelSet that = (LabelSet) other;
Iterator<TextValue> thisIterator = iterator();
Iterator<TextValue> thatIterator = that.iterator();
while ( thisIterator.hasNext() && thatIterator.hasNext() )
{
TextValue label1 = thisIterator.next();
TextValue label2 = thatIterator.next();
if ( !label1.equals( label2 ) )
{
return false;
}
}
return true;
}
}
@Override
public VirtualValueGroup valueGroup()
{
return LABEL_SET;
}
@Override
public int compareTo( VirtualValue other, Comparator<AnyValue> comparator )
{
if ( !(other instanceof LabelSet) )
{
throw new IllegalArgumentException( "Cannot compare different virtual values" );
}
LabelSet otherSet = (LabelSet) other;
int x = Integer.compare( this.size(), otherSet.size() );
if ( x == 0 )
{
if ( otherSet instanceof ArrayBasedLabelSet )
{
ArrayBasedLabelSet otherArraySet = (ArrayBasedLabelSet) otherSet;
for ( int i = 0; i < size(); i++ )
{
x = comparator.compare( labels[i], otherArraySet.labels[i] );
if ( x != 0 )
{
return x;
}
}
}
else
{
Iterator<TextValue> thisIterator = iterator();
Iterator<TextValue> thatIterator = otherSet.iterator();
while ( thisIterator.hasNext() && thatIterator.hasNext() )
{
TextValue label1 = thisIterator.next();
TextValue label2 = thatIterator.next();
x = comparator.compare( label1, label2 );
if ( x != 0 )
{
return x;
}
}
}
}
return x;
}
@Override
public String toString()
{
return Arrays.toString( labels );
}
@Override
public int size()
{
return labels.length;
}
@SuppressWarnings( "NullableProblems" )
@Override
public Iterator<TextValue> iterator()
{
return asIterator( labels );
}
}
}