gvsig-tools / org.gvsig.tools / library / trunk / org.gvsig.tools / org.gvsig.tools.lib / src / main / java / org / gvsig / tools / dataTypes / impl / DefaultDataType.java @ 728
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1 | 145 | jjdelcerro | package org.gvsig.tools.dataTypes.impl; |
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2 | |||
3 | import java.text.MessageFormat; |
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4 | |||
5 | import org.gvsig.tools.dataTypes.CoercionException; |
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6 | import org.gvsig.tools.dataTypes.DataType; |
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7 | import org.gvsig.tools.dataTypes.DataTypes; |
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8 | import org.gvsig.tools.dataTypes.DataTypesManager.Coercion; |
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9 | 697 | jjdelcerro | import org.slf4j.Logger; |
10 | import org.slf4j.LoggerFactory; |
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11 | 145 | jjdelcerro | |
12 | public class DefaultDataType implements DataType { |
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13 | |||
14 | private static final Logger LOG = LoggerFactory.getLogger(DefaultDataTypesManager.class); |
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15 | |||
16 | private Coercion coercion;
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17 | private Class defaultClass; |
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18 | private String subtype; |
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19 | private int type; |
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20 | private String name; |
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21 | |||
22 | DefaultDataType(int type, String subtype, String name, Class defaultClass, Coercion coercion) { |
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23 | |||
24 | if( name == null ) { |
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25 | LOG.trace("Can't register null type name for type {}.", new Object[] { Integer.toHexString(type).toUpperCase()}); |
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26 | throw new IllegalArgumentException(); |
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27 | } |
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28 | this.type = type;
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29 | this.subtype = subtype;
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30 | this.name = name;
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31 | this.defaultClass = defaultClass;
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32 | this.coercion = coercion;
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33 | } |
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34 | |||
35 | public Object coerce(Object value) throws CoercionException { |
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36 | // http://en.wikipedia.org/wiki/Type_conversion#Implicit_type_conversion
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37 | |||
38 | if( this.coercion != null ) { |
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39 | return this.coercion.coerce(value); |
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40 | } |
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41 | if( defaultClass == null ) { |
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42 | 697 | jjdelcerro | return value; // �? |
43 | 145 | jjdelcerro | } |
44 | if( defaultClass.isInstance(value) ) {
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45 | return value;
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46 | } |
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47 | throw new CoercionException(); |
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48 | } |
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49 | |||
50 | public Coercion getCoercion() {
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51 | return this.coercion; |
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52 | } |
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53 | |||
54 | public Class getDefaultClass() { |
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55 | return this.defaultClass; |
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56 | } |
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57 | |||
58 | public String getSubtype() { |
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59 | return this.subtype; |
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60 | } |
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61 | |||
62 | public int getType() { |
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63 | return this.type; |
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64 | } |
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65 | |||
66 | public String getName() { |
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67 | return this.name; |
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68 | } |
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69 | |||
70 | public boolean isContainer() { |
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71 | return (type & DataTypes.CONTAINER) == DataTypes.CONTAINER;
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72 | } |
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73 | |||
74 | public boolean isObject() { |
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75 | return (type & DataTypes.OBJECT) == DataTypes.OBJECT;
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76 | } |
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77 | |||
78 | 630 | cmartin | public boolean isDynObject() { |
79 | return type == DataTypes.DYNOBJECT;
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80 | } |
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81 | |||
82 | 145 | jjdelcerro | public void setCoercion(Coercion coercion) { |
83 | this.coercion = coercion;
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84 | LOG.trace("Add coercion operation for data type {}.", new Object[] { name }); |
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85 | } |
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86 | |||
87 | 697 | jjdelcerro | public void addCoercion(Coercion coercion) { |
88 | LinkedCoercions coercions = null;
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89 | 725 | jldominguez | if (this.coercion instanceof LinkedCoercions) { |
90 | 697 | jjdelcerro | coercions = (LinkedCoercions) this.coercion;
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91 | } else {
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92 | coercions = new LinkedCoercions();
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93 | coercions.add(this.coercion);
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94 | this.coercion = coercions;
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95 | } |
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96 | coercions.add(coercion); |
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97 | LOG.trace("Add coercion operation for data type {}.", new Object[] { name }); |
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98 | } |
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99 | |||
100 | 145 | jjdelcerro | public String toString() { |
101 | return MessageFormat.format( |
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102 | "type=0x{0};subtype={1};name={2};class={3};coercion={4}",
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103 | new Object[] { |
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104 | Integer.toHexString(type).toUpperCase(),
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105 | subtype, |
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106 | name, |
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107 | defaultClass==null? null:defaultClass.getName(), |
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108 | coercion==null? null:coercion.getClass().getName() |
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109 | } |
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110 | ); |
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111 | } |
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112 | 216 | jjdelcerro | |
113 | public boolean isNumeric() { |
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114 | if( type == DataTypes.DOUBLE ||
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115 | type == DataTypes.FLOAT || |
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116 | type == DataTypes.INT || |
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117 | type == DataTypes.LONG){ |
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118 | return true; |
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119 | } |
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120 | return false; |
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121 | } |
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122 | |||
123 | 697 | jjdelcerro | public class LinkedCoercions implements Coercion { |
124 | |||
125 | public class LinkedCoercion { |
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126 | Coercion coercion; |
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127 | LinkedCoercion theNext; |
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128 | |||
129 | LinkedCoercion(Coercion coercion, LinkedCoercion next) { |
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130 | this.theNext = next;
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131 | this.coercion = coercion;
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132 | } |
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133 | |||
134 | public Object coerce(Object value) throws CoercionException { |
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135 | return this.coercion.coerce(value); |
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136 | } |
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137 | |||
138 | public boolean is(Coercion coercion) { |
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139 | return coercion.getClass().getName().equals(this.coercion.getClass().getName()); |
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140 | } |
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141 | |||
142 | public boolean hasNext() { |
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143 | return this.theNext != null; |
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144 | } |
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145 | |||
146 | public LinkedCoercion next() {
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147 | return this.theNext; |
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148 | } |
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149 | } |
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150 | |||
151 | LinkedCoercion head = null;
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152 | |||
153 | public LinkedCoercions() {
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154 | super();
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155 | } |
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156 | |||
157 | public void add(Coercion coercion) { |
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158 | if( !this.contains(coercion)) { |
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159 | head = new LinkedCoercion(coercion, head);
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160 | } |
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161 | } |
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162 | |||
163 | public boolean contains(Coercion coercion) { |
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164 | LinkedCoercion x = head; |
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165 | while( x!=null ) { |
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166 | if( x.is(coercion)) {
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167 | return true; |
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168 | } |
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169 | x = x.next(); |
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170 | } |
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171 | return false; |
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172 | } |
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173 | |||
174 | public Object coerce(Object value) throws CoercionException { |
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175 | LinkedCoercion x = head; |
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176 | while( x!=null ) { |
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177 | try {
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178 | return x.coerce(value);
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179 | } catch (CoercionException e) {
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180 | x = x.next(); |
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181 | if( x==null ) { |
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182 | throw e;
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183 | } |
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184 | } |
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185 | } |
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186 | throw new CoercionException(); |
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187 | } |
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188 | |||
189 | } |
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190 | |||
191 | |||
192 | 145 | jjdelcerro | } |