📄 dynaactionform.java
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* exists, but is not mapped
*/
public Object get(String name, String key) {
Object value = dynaValues.get(name);
if (value == null) {
throw new NullPointerException
("No mapped value for '" + name + "(" + key + ")'");
} else if (value instanceof Map) {
return (((Map) value).get(key));
} else {
throw new IllegalArgumentException
("Non-mapped property for '" + name + "(" + key + ")'");
}
}
/**
* Return the <code>DynaClass</code> instance that describes the set of
* properties available for this DynaBean.
*/
public DynaClass getDynaClass() {
return (this.dynaClass);
}
/**
* Returns the <code>Map</code> containing the property values. This is
* done mostly to facilitate accessing the <code>DynaActionForm</code>
* through JavaBeans accessors, in order to use the JavaServer Pages
* Standard Tag Library.
*<p>
* For instance, the normal JSTL EL syntax for accessing an
* <code>ActionForm</code> would be something like this:
* <pre>
* ${formbean.prop}</pre>
* The JSTL EL syntax for accessing a <code>DynaActionForm</code> looks
* something like this (because of the presence of this
* <code>getMap()</code> method):
* <pre>
* ${dynabean.map.prop}</pre>
*/
public Map getMap() {
return (dynaValues);
}
/**
* Remove any existing value for the specified key on the
* specified mapped property.
*
* @param name Name of the property for which a value is to
* be removed
* @param key Key of the value to be removed
*
* @exception IllegalArgumentException if there is no property
* of the specified name
*/
public void remove(String name, String key) {
Object value = dynaValues.get(name);
if (value == null) {
throw new NullPointerException
("No mapped value for '" + name + "(" + key + ")'");
} else if (value instanceof Map) {
((Map) value).remove(key);
} else {
throw new IllegalArgumentException
("Non-mapped property for '" + name + "(" + key + ")'");
}
}
/**
* Set the value of a simple property with the specified name.
*
* @param name Name of the property whose value is to be set
* @param value Value to which this property is to be set
*
* @exception ConversionException if the specified value cannot be
* converted to the type required for this property
* @exception IllegalArgumentException if there is no property
* of the specified name
* @exception NullPointerException if the type specified for the
* property is invalid
* @exception NullPointerException if an attempt is made to set a
* primitive property to null
*/
public void set(String name, Object value) {
DynaProperty descriptor = getDynaProperty(name);
if (descriptor.getType() == null) {
throw new NullPointerException
("The type for property " + name + " is invalid");
}
if (value == null) {
if (descriptor.getType().isPrimitive()) {
throw new NullPointerException
("Primitive value for '" + name + "'");
}
} else if (!isDynaAssignable(descriptor.getType(), value.getClass())) {
throw new ConversionException
("Cannot assign value of type '" +
value.getClass().getName() +
"' to property '" + name + "' of type '" +
descriptor.getType().getName() + "'");
}
dynaValues.put(name, value);
}
/**
* Set the value of an indexed property with the specified name.
*
* @param name Name of the property whose value is to be set
* @param index Index of the property to be set
* @param value Value to which this property is to be set
*
* @exception ConversionException if the specified value cannot be
* converted to the type required for this property
* @exception IllegalArgumentException if there is no property
* of the specified name
* @exception IllegalArgumentException if the specified property
* exists, but is not indexed
* @exception IndexOutOfBoundsException if the specified index
* is outside the range of the underlying property
*/
public void set(String name, int index, Object value) {
Object prop = dynaValues.get(name);
if (prop == null) {
throw new NullPointerException
("No indexed value for '" + name + "[" + index + "]'");
} else if (prop.getClass().isArray()) {
Array.set(prop, index, value);
} else if (prop instanceof List) {
try {
((List) prop).set(index, value);
} catch (ClassCastException e) {
throw new ConversionException(e.getMessage());
}
} else {
throw new IllegalArgumentException
("Non-indexed property for '" + name + "[" + index + "]'");
}
}
/**
* Set the value of a mapped property with the specified name.
*
* @param name Name of the property whose value is to be set
* @param key Key of the property to be set
* @param value Value to which this property is to be set
*
* @exception ConversionException if the specified value cannot be
* converted to the type required for this property
* @exception IllegalArgumentException if there is no property
* of the specified name
* @exception IllegalArgumentException if the specified property
* exists, but is not mapped
*/
public void set(String name, String key, Object value) {
Object prop = dynaValues.get(name);
if (prop == null) {
throw new NullPointerException
("No mapped value for '" + name + "(" + key + ")'");
} else if (prop instanceof Map) {
((Map) prop).put(key, value);
} else {
throw new IllegalArgumentException
("Non-mapped property for '" + name + "(" + key + ")'");
}
}
// --------------------------------------------------------- Public Methods
/**
* Render a String representation of this object.
*/
public String toString() {
StringBuffer sb = new StringBuffer("DynaActionForm[dynaClass=");
sb.append(getDynaClass().getName());
DynaProperty props[] = getDynaClass().getDynaProperties();
if (props == null) {
props = new DynaProperty[0];
}
for (int i = 0; i < props.length; i++) {
sb.append(',');
sb.append(props[i].getName());
sb.append('=');
Object value = get(props[i].getName());
if (value == null) {
sb.append("<NULL>");
} else if (value.getClass().isArray()) {
int n = Array.getLength(value);
sb.append("{");
for (int j = 0; j < n; j++) {
if (j > 0) {
sb.append(',');
}
sb.append(Array.get(value, j));
}
sb.append("}");
} else if (value instanceof List) {
int n = ((List) value).size();
sb.append("{");
for (int j = 0; j < n; j++) {
if (j > 0) {
sb.append(',');
}
sb.append(((List) value).get(j));
}
sb.append("}");
} else if (value instanceof Map) {
int n = 0;
Iterator keys = ((Map) value).keySet().iterator();
sb.append("{");
while (keys.hasNext()) {
if (n > 0) {
sb.append(',');
}
n++;
String key = (String) keys.next();
sb.append(key);
sb.append('=');
sb.append(((Map) value).get(key));
}
sb.append("}");
} else {
sb.append(value);
}
}
sb.append("]");
return (sb.toString());
}
// -------------------------------------------------------- Package Methods
/**
* Set the DynaActionFormClass instance that we are associated with.
*
* @param dynaClass The DynaActionFormClass instance for this bean
*/
void setDynaActionFormClass(DynaActionFormClass dynaClass) {
this.dynaClass = dynaClass;
}
// ------------------------------------------------------ Protected Methods
/**
* Return the property descriptor for the specified property name.
*
* @param name Name of the property for which to retrieve the descriptor
*
* @exception IllegalArgumentException if this is not a valid property
* name for our DynaClass
*/
protected DynaProperty getDynaProperty(String name) {
DynaProperty descriptor = getDynaClass().getDynaProperty(name);
if (descriptor == null) {
throw new IllegalArgumentException
("Invalid property name '" + name + "'");
}
return (descriptor);
}
/**
* Indicates if an object of the source class is assignable to the destination class.
*
* @param dest Destination class
* @param source Source class
*/
protected boolean isDynaAssignable(Class dest, Class source) {
if (dest.isAssignableFrom(source) ||
((dest == Boolean.TYPE) && (source == Boolean.class)) ||
((dest == Byte.TYPE) && (source == Byte.class)) ||
((dest == Character.TYPE) && (source == Character.class)) ||
((dest == Double.TYPE) && (source == Double.class)) ||
((dest == Float.TYPE) && (source == Float.class)) ||
((dest == Integer.TYPE) && (source == Integer.class)) ||
((dest == Long.TYPE) && (source == Long.class)) ||
((dest == Short.TYPE) && (source == Short.class))) {
return (true);
} else {
return (false);
}
}
}
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