001 package market; 002 003 /** 004 * The simplest implementation of ValueChecker. It only checks a String for emptiness, if wanted.<br> 005 * A VCDummy is used for text fields, that need to be a {@link market.swing.JTFCheckable} to allow 006 * access from outside the defining class, but for which no content checking is required. 007 */ 008 public class VCDummy implements ValueChecker { 009 010 /** 011 * The identifier used by {@link #getErrorString()}. 012 */ 013 protected String identifier; 014 015 /** 016 * Defines if an empty String is considered to be an error or not. 017 */ 018 protected boolean mayBeEmpty; 019 020 /** 021 * @param identifier the identifier. 022 * @param mayBeEmpty <code>true</code> if an empty should be considered valid, otherwise <code>false</code>. 023 */ 024 public VCDummy(String identifier, boolean mayBeEmpty) { 025 this.identifier = identifier; 026 this.mayBeEmpty = mayBeEmpty; 027 } 028 029 /** 030 * @param identifier the identifier. 031 */ 032 public VCDummy(String identifier) { 033 this.identifier = identifier; 034 this.mayBeEmpty = false; 035 } 036 037 /** 038 * @param content the String to be checked. 039 * @return always <code>true</code> if {@link #mayBeEmpty} is <code>true</code>, otherwise it returns 040 * <code>true</code> if <code>content</code> is not empty. 041 */ 042 public boolean isValidValue(String content) { 043 return (mayBeEmpty || !content.equals("")); 044 } 045 046 /** 047 * @return an error message if the String is empty when it shouldn't. 048 */ 049 public String getErrorString() { 050 return "Fehlerhafte Eingabe im Feld " + identifier + ": Das Feld darf nicht leer sein."; 051 } 052 }