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Neo4j kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see http://neo4j.org.

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/*
 * Copyright (c) "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 .
 */
package org.neo4j.kernel.api.exceptions.schema;

import java.util.Collections;
import java.util.Iterator;
import java.util.Set;

import org.neo4j.common.TokenNameLookup;
import org.neo4j.internal.helpers.Exceptions;
import org.neo4j.internal.kernel.api.exceptions.schema.ConstraintValidationException;
import org.neo4j.internal.schema.SchemaDescriptor;
import org.neo4j.internal.schema.constraints.IndexBackedConstraintDescriptor;
import org.neo4j.kernel.api.exceptions.index.IndexEntryConflictException;

public class UniquePropertyValueValidationException extends ConstraintValidationException
{
    private final Set conflicts;

    public UniquePropertyValueValidationException( IndexBackedConstraintDescriptor constraint, ConstraintValidationException.Phase phase,
            IndexEntryConflictException conflict, TokenNameLookup tokenNameLookup )
    {
        this( constraint, phase, Collections.singleton( conflict ), tokenNameLookup );
    }

    public UniquePropertyValueValidationException( IndexBackedConstraintDescriptor constraint, ConstraintValidationException.Phase phase,
            Set conflicts, TokenNameLookup tokenNameLookup )
    {
        super( constraint, phase, phase == Phase.VERIFICATION ? "Existing data" : "New data", buildCauseChain( conflicts ), tokenNameLookup );
        this.conflicts = conflicts;
    }

    private static IndexEntryConflictException buildCauseChain( Set conflicts )
    {
        IndexEntryConflictException chainedConflicts = null;
        for ( IndexEntryConflictException conflict : conflicts )
        {
            chainedConflicts = Exceptions.chain( chainedConflicts, conflict );
        }
        return chainedConflicts;
    }

    public UniquePropertyValueValidationException( IndexBackedConstraintDescriptor constraint, ConstraintValidationException.Phase phase, Throwable cause,
            TokenNameLookup tokenNameLookup )
    {
        super( constraint, phase, phase == Phase.VERIFICATION ? "Existing data" : "New data", cause, tokenNameLookup );
        this.conflicts = Collections.emptySet();
    }

    @Override
    public String getUserMessage( TokenNameLookup tokenNameLookup )
    {
        SchemaDescriptor schema = constraint.schema();
        StringBuilder message = new StringBuilder();
        for ( Iterator iterator = conflicts.iterator(); iterator.hasNext(); )
        {
            IndexEntryConflictException conflict = iterator.next();
            message.append( conflict.evidenceMessage( tokenNameLookup, schema ) );
            if ( iterator.hasNext() )
            {
                message.append( System.lineSeparator() );
            }
        }
        return message.toString();
    }

    public Set conflicts()
    {
        return conflicts;
    }
}