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IndexSpecifier.java
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IndexSpecifier.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.kernel.builtinprocs;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.neo4j.helpers.collection.Pair;
import static java.lang.String.format;
public class IndexSpecifier
{
private final String specification;
private final String label;
private final String property;
public IndexSpecifier( String specification )
{
this.specification = specification;
Pair<String, String> components = parse();
label = components.first();
property = components.other();
}
public String label()
{
return label;
}
public String property()
{
return property;
}
@Override
public String toString()
{
return specification;
}
private Pair<String, String> parse()
{
Pattern pattern = Pattern.compile( "" +
":" + or( simpleIdentifier( "simpleLabel" ), complexIdentifier( "complexLabel" ) ) +
"\\(" + or( simpleIdentifier( "simpleProperty" ), complexIdentifier( "complexProperty" ) ) + "\\)"
);
Matcher matcher = pattern.matcher( specification );
if ( !matcher.find() )
{
throw new IllegalArgumentException( "Cannot parse index specification " + specification );
}
return Pair.of(
either( matcher.group( "simpleLabel" ), matcher.group( "complexLabel" ) ),
either( matcher.group( "simpleProperty" ), matcher.group( "complexProperty" ) )
);
}
private String either( String first, String second )
{
return first != null ? first : second;
}
private static String or( String first, String second )
{
return "(:?" + first + "|" + second + ")";
}
private static String simpleIdentifier( String name )
{
return format( "(?<%s>[A-Za-z0-9_]+)", name );
}
private static String complexIdentifier( String name )
{
return format( "(?:`(?<%s>[^`]+)`)", name );
}
}