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Data definition and queries Kotlin DSL over Xodus

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/**
 * Copyright 2006 - 2017 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package jetbrains.exodus.database.exceptions;

import jetbrains.exodus.query.metadata.Index;
import jetbrains.exodus.database.TransientEntity;
import jetbrains.exodus.query.metadata.IndexField;

import java.util.List;

public class UniqueIndexViolationException extends SimplePropertyValidationException {

    public UniqueIndexViolationException(TransientEntity entity, Index index) {
        super("Index [" + index + "]" + " must be unique. Conflicting value: [" + formatConflict(entity, index) + "]",
                "Value should be unique", entity, index.getFields().get(0).getName());
    }

    private static String formatConflict(TransientEntity entity, Index index){
        StringBuilder conflict = new StringBuilder();
        List fields = index.getFields();
        for(IndexField field: fields){
            if(field.isProperty()) {
                conflict.append(entity.getProperty(field.getName()));
            } else {
                conflict.append(entity.getLink(field.getName()));
            }
            conflict.append(", ");
        }
        return conflict.length() > 0 ? conflict.substring(0, conflict.length() - 2) : "No accessible value";
    }
}