net.anotheria.anosite.handler.validation.AbstractFormBean Maven / Gradle / Ivy
package net.anotheria.anosite.handler.validation;
import java.io.Serializable;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.servlet.http.HttpServletRequest;
/**
* Form definition bean used in {@link AbstractValidationBoxHandler}.
*
* @author Alexandr Bolbat
*/
public abstract class AbstractFormBean implements Serializable {
/**
* Basic serialVersionUID variable.
*/
private static final long serialVersionUID = 3724770407071535482L;
/**
* Utility constant with empty {@link String} value.
*/
public static final String EMPTY_STRING = "";
/**
* Utility constant with empty {@link Number} value.
*/
public static final Number EMPTY_NUMBER = -1;
/**
* Utility constant with empty {@link Boolean} value.
*/
public static final boolean EMPTY_BOOLEAN = false;
/**
* Utility constant with empty {@link List} value.
*/
public static final List EMPTY_LIST = Collections.emptyList();
/**
* Utility constant with empty {@link Set} value.
*/
public static final Set EMPTY_SET = Collections.emptySet();
/**
* Internal storage for form data.
*/
private final Map formData = new HashMap();
/**
* Get set of all form fields names. By default it use key set from internal storage.
*
* @return Set of {@link String}
*/
public Set getFieldsNames(){
return formData.keySet();
}
/**
* Get form field value by form field name. By default it use internal storage.
*
* @param fieldName
* - form field name
* @return {@link Object}
*/
public Object getFieldValue(final String fieldName) {
return readField(fieldName);
}
/**
* Save field value to form data storage.
*
* @param name
* - field name
* @param value
* - field value
*/
protected final void saveField(final String name, final Object value) {
formData.put(name, value);
}
/**
* Read field value from form data storage. Return value or null.
*
* @param name
* - field name
* @return {@link Object}
*/
protected final Object readField(final String name) {
return formData.get(name);
}
/**
* Read field value from form data storage in real type. Can be returned with some default value if real value not exist in storage.
*
* @param name
* - field name
* @param fieldType
* - field value type class
* @return T
*/
protected final T readField(final String name, Class fieldType, T defaultValue) {
Object value = readField(name);
if (value == null)
return defaultValue;
return fieldType.cast(value);
}
/**
* Any bean extended from this abstract class must have possibility to initialize by self from request.
*
* @param req
* - request
*/
protected abstract void prepare(final HttpServletRequest req);
}