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package dk.thoerup.webconfig; |
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import java.lang.reflect.Field; |
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import java.lang.reflect.Method; |
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abstract public class ConfigLoader { |
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// TODO: should this class be enhanced with a saveConfig() and a setValue() ?? |
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public abstract String getValue(String paramName); |
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public void loadConfig(Object configObject) { |
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Field fields[] = configObject.getClass().getDeclaredFields(); |
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for(Field field : fields) { |
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field.setAccessible(true); |
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ConfigVariable anno = field.getAnnotation(ConfigVariable.class); |
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if (anno == null) |
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continue; |
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String propertyName = anno.propertyname().equals("") ? field.getName() : anno.propertyname(); |
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String value = getValue( propertyName ); |
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if (value == null) { |
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if (anno.mandatory()) { |
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//TODO: find another exception to throw here |
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throw new RuntimeException("Could not find a value to this field: " + field.getName() ); |
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} else { |
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System.out.println("Could not find a value to this field: " + field.getName() ); |
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continue; |
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} |
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} |
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setFieldValue(field,configObject,value); |
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} |
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} |
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public static void setFieldValue(Field field, Object configObject, String value) { |
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field.setAccessible(true); |
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try { |
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if (field.getType().getName().equals("int") ) { |
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field.setInt(configObject, Integer.parseInt(value) ); |
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} else if (field.getType().getName().equals("boolean") ) { |
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value = value.toLowerCase(); |
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if (! (value.equals("true") || value.equals("false"))) { |
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//TODO: Find another exception to throw here |
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throw new RuntimeException("Only 'true' or 'false' as values for boolean field"); |
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} |
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field.setBoolean(configObject, Boolean.parseBoolean(value) ); |
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} else if (field.getType().getName().equals("long") ) { |
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field.setLong(configObject, Long.parseLong(value) ); |
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} else if (field.getType().getName().equals("short") ) { |
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field.setShort(configObject, Short.parseShort(value) ); |
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} else if (field.getType().getName().equals("double") ) { |
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field.setDouble(configObject, Double.parseDouble(value) ); |
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} else if (field.getType().getName().equals("float") ) { |
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field.setFloat(configObject, Float.parseFloat(value) ); |
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} else if (field.getType().getName().equals("char") ) { |
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field.setFloat(configObject, value.charAt(0) ); |
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} else if (field.getType().isEnum() ) { |
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//throw new RuntimeException("Enums are not supported (yet)"); |
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Object enumval = parseEnumValue(field.getType(), configObject,value); |
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field.set(configObject, enumval ); |
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} else { |
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//System.out.print(" >" + field.getType().getName() ); |
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field.set(configObject, value ); |
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} |
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} catch (IllegalAccessException e) { |
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//this should never happen since we already have called setAccessible(true) |
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throw new RuntimeException("How did we get here?", e); |
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} |
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} |
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protected static Object parseEnumValue(Class<?> cls, Object configObject, String value) { |
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try { |
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Class<?> argTypes[] = {String.class}; |
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Object args[] = {value}; |
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Method valueOf = cls.getMethod("valueOf", argTypes); |
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return valueOf.invoke(configObject, args); |
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} catch (Exception e) { |
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throw new RuntimeException(e); |
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} |
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} |
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} |
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