1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.db.layer0.adapter;
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14 import org.simantics.db.WriteGraph;
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15 import org.simantics.db.exception.DatabaseException;
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17 public interface Modifier<T> {
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20 * @return an initial text to be modified
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25 * Validates the given string. Returns an error message to display if the
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26 * new text is invalid. Returns <code>null</code> if there is no error. Note
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27 * that the empty string is not treated the same as <code>null</code>; it
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28 * indicates an error state but with no message to display.
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30 * @param newText the text to check for validity
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31 * @return an error message or <code>null</code> if no error
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33 String isValid(T newValue);
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36 * @param graph access to the graph database
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37 * @param value the new value to set
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39 void modify(WriteGraph graph, T value) throws DatabaseException;
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