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SchemaRule.java
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SchemaRule.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.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.storageengine.api.schema;
import org.neo4j.internal.kernel.api.exceptions.schema.MalformedSchemaRuleException;
import org.neo4j.internal.kernel.api.schema.LabelSchemaDescriptor;
import org.neo4j.internal.kernel.api.schema.RelationTypeSchemaDescriptor;
import org.neo4j.internal.kernel.api.schema.SchemaComputer;
import org.neo4j.internal.kernel.api.schema.SchemaDescriptor;
import org.neo4j.internal.kernel.api.schema.SchemaDescriptorSupplier;
import org.neo4j.internal.kernel.api.schema.constraints.ConstraintDescriptor;
/**
* Represents a stored schema rule.
*/
public interface SchemaRule extends SchemaDescriptorSupplier
{
static String nameOrDefault( String name, String defaultName )
{
if ( name == null )
{
return defaultName;
}
else if ( name.isEmpty() )
{
throw new IllegalArgumentException( "Schema rule name cannot be the empty string" );
}
else
{
int length = name.length();
for ( int i = 0; i < length; i++ )
{
char ch = name.charAt( i );
if ( ch == '\0' )
{
throw new IllegalArgumentException( "Illegal schema rule name: '" + name + "'" );
}
}
}
return name;
}
static String checkName( String name )
{
if ( name == null || name.isEmpty() )
{
throw new IllegalArgumentException( "Schema rule name cannot be the empty string" );
}
else
{
int length = name.length();
for ( int i = 0; i < length; i++ )
{
char ch = name.charAt( i );
if ( ch == '\0' )
{
throw new IllegalArgumentException( "Illegal schema rule name: '" + name + "'" );
}
}
}
return name;
}
/**
* The persistence id for this rule.
*/
long getId();
/**
* @return The (possibly user supplied) name of this schema rule.
*/
String getName();
/**
* This enum is used for the legacy schema store, and should not be extended.
* @see org.neo4j.kernel.impl.store.record.SchemaRuleSerialization for the new (de)serialisation code instead.
*/
@Deprecated
enum Kind
{
INDEX_RULE( "Index" ),
CONSTRAINT_INDEX_RULE( "Constraint index" ),
UNIQUENESS_CONSTRAINT( "Uniqueness constraint" ),
NODE_PROPERTY_EXISTENCE_CONSTRAINT( "Node property existence constraint" ),
RELATIONSHIP_PROPERTY_EXISTENCE_CONSTRAINT( "Relationship property existence constraint" );
private static final Kind[] ALL = values();
private final String userString;
Kind( String userString )
{
this.userString = userString;
}
public byte id()
{
return (byte) (ordinal() + 1);
}
public String userString()
{
return userString;
}
public static Kind forId( byte id ) throws MalformedSchemaRuleException
{
if ( id >= 1 && id <= ALL.length )
{
return values()[id - 1];
}
throw new MalformedSchemaRuleException( null, "Unknown kind id %d", id );
}
public static Kind map( IndexDescriptor descriptor )
{
switch ( descriptor.type() )
{
case GENERAL:
return INDEX_RULE;
case UNIQUE:
return CONSTRAINT_INDEX_RULE;
default:
throw new IllegalStateException(
"Cannot map descriptor type to legacy schema rule: " + descriptor.type() );
}
}
public static Kind map( ConstraintDescriptor descriptor )
{
switch ( descriptor.type() )
{
case UNIQUE:
return UNIQUENESS_CONSTRAINT;
case EXISTS:
return descriptor.schema().computeWith( existenceKindMapper );
default:
throw new IllegalStateException(
"Cannot map descriptor type to legacy schema rule: " + descriptor.type() );
}
}
private static SchemaComputer<Kind> existenceKindMapper = new SchemaComputer<Kind>()
{
@Override
public Kind computeSpecific( LabelSchemaDescriptor schema )
{
return NODE_PROPERTY_EXISTENCE_CONSTRAINT;
}
@Override
public Kind computeSpecific( RelationTypeSchemaDescriptor schema )
{
return RELATIONSHIP_PROPERTY_EXISTENCE_CONSTRAINT;
}
@Override
public Kind computeSpecific( SchemaDescriptor schema )
{
throw new IllegalStateException( "General schema rules cannot support constraints" );
}
};
}
}