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1 /* Parameter -- General digilib parameter class.
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2
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3 Digital Image Library servlet components
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4
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5 Copyright (C) 2003 Robert Casties (robcast@mail.berlios.de)
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6
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7 This program is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2 of the License, or (at your
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10 option) any later version.
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11
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12 Please read license.txt for the full details. A copy of the GPL
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13 may be found at http://www.gnu.org/copyleft/lgpl.html
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 *
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20 * Created on 02.09.2003 by casties
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21 *
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22 */
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23 package digilib.servlet;
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24
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25 /** General digilib parameter class.
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26 *
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27 * @author casties
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28 *
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29 */
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30 public class Parameter {
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31 /** real value */
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32 protected Object value = null;
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33
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34 /** default value */
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35 protected Object defval = null;
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36
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37 /** parameter name (e.g. in config file) */
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38 protected String name = null;
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39
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40 /** parameter type */
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41 protected int type = 0;
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42
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43 /** Default constructor.
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44 *
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45 */
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46 public Parameter() {
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47 super();
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48 }
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49
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50 /** Constructor with name, default, and value.
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51 *
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52 * @param value
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53 * @param defval
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54 */
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55 public Parameter(String name, Object defval, Object value) {
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56 this.name = name;
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57 this.value = value;
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58 this.defval = defval;
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59 }
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60
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61 /** Constructor with name, default, value, and type.
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62 * @param value
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63 * @param defval
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64 */
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65 public Parameter(String name, Object defval, Object value, int type) {
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66 this.name = name;
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67 this.value = value;
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68 this.defval = defval;
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69 this.type = type;
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70 }
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71
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72 /** Is the value valid.
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73 *
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74 * @return
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75 */
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76 public boolean hasValue() {
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77 return (value != null);
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78 }
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79
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80 /** Try to set the value from a String.
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81 *
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82 * Tries to convert the String to the same type as the default value.
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83 * Sets the value anyway if the default is null.
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84 * Returns if the value could be set.
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85 *
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86 * @param val
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87 * @return
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88 */
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89 public boolean setValueFromString(String val) {
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90 if (defval == null) {
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91 this.value = val;
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92 return true;
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93 }
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94 Class c = defval.getClass();
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95 // take String as is
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96 if (c == String.class) {
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97 this.value = val;
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98 return true;
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99 }
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100 // set Boolean if string == "true"
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101 if (c == Boolean.class) {
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102 this.value = new Boolean(val.compareToIgnoreCase("true") == 0);
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103 return true;
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104 }
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105 // set Integer
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106 if (c == Integer.class) {
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107 this.value = new Integer(Integer.parseInt(val));
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108 return true;
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109 }
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110 // set Float
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111 if (c == Float.class) {
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112 this.value = new Float(Float.parseFloat(val));
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113 return true;
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114 }
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115 // then it's unknown
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116 return false;
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117 }
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118
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119 /** Get the default as Object.
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120 *
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121 * @return
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122 */
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123 public Object getDefault() {
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124 return defval;
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125 }
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126
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127 /** Set the default.
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128 * @param defval
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129 */
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130 public void setDefault(Object defval) {
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131 this.defval = defval;
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132 }
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133
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134 /** Get the value as Object.
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135 *
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136 * Returns the default if the value is not set.
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137 *
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138 * @return
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139 */
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140 public Object getValue() {
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141 return (value != null) ? value : defval;
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142 }
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143
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144 public int getAsInt() {
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145 Integer i = (Integer) getValue();
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146 return (i != null) ? i.intValue() : 0;
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147 }
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148
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149 public float getAsFloat() {
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150 Float f = (Float) getValue();
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151 return (f != null) ? f.floatValue() : 0f;
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152 }
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153
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154 public String getAsString() {
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155 return (String) getValue();
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156 }
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157
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158 public boolean getAsBoolean() {
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159 Boolean b = (Boolean) getValue();
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160 return (b != null) ? b.booleanValue() : false;
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161 }
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162
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163 /** Set the value.
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164 *
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165 * @param value
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166 */
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167 public void setValue(Object value) {
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168 this.value = value;
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169 }
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170
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171 /**
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172 * @return
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173 */
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174 public String getName() {
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175 return name;
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176 }
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177
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178 /**
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179 * @param name
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180 */
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181 public void setName(String name) {
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182 this.name = name;
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183 }
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184
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185 /**
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186 * @return
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187 */
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188 public int getType() {
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189 return type;
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190 }
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191
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192 /**
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193 * @param type
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194 */
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195 public void setType(int type) {
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196 this.type = type;
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197 }
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198
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199 }
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