package org.apache.fulcrum.intake.model;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Locale;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.fulcrum.intake.IntakeError;
import org.apache.fulcrum.intake.IntakeException;
import org.apache.fulcrum.intake.IntakeServiceFacade;
import org.apache.fulcrum.intake.Retrievable;
import org.apache.fulcrum.intake.validator.DefaultValidator;
import org.apache.fulcrum.intake.validator.InitableByConstraintMap;
import org.apache.fulcrum.intake.validator.ValidationException;
import org.apache.fulcrum.intake.validator.Validator;
import org.apache.fulcrum.intake.xmlmodel.Rule;
import org.apache.fulcrum.intake.xmlmodel.XmlField;
import org.apache.fulcrum.parser.ValueParser;
/**
* Base class for Intake generated input processing classes.
*
* @author <a href="mailto:jmcnally@collab.net">John McNally</a>
* @author <a href="mailto:dlr@finemaltcoding.com>Daniel Rall</a>
* @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
* @author <a href="mailto:quintonm@bellsouth.net">Quinton McCombs</a>
* @author <a href="mailto:jh@byteaction.de">Jürgen Hoffmann</a>
* @author <a href="mailto:tv@apache.org">Thomas Vandahl</a>
* @version $Id: Field.java 671342 2008-06-24 20:57:54Z tv $
*/
public abstract class Field
{
/** Empty Value */
private static final String EMPTY = "";
/** CGI Key for "value if absent" */
private static final String VALUE_IF_ABSENT_KEY = "_vifa_";
/** Default Validator Package */
public static final String defaultValidatorPackage = "org.apache.fulcrum.intake.validator.";
/** Default Field Package */
public static final String defaultFieldPackage = "org.apache.fulcrum.intake.model.";
// the following are set from the xml file and are permanent (final)
/** Name of the field. */
protected final String name;
/** Key used to identify the field in the parser */
protected final String key;
/** Display name of the field to be used on data entry forms... */
protected String displayName;
/** Class name of the object to which the field is mapped */
protected final String mapToObject;
/** Used to validate the contents of the field */
protected Validator validator;
/** Getter method in the mapped object used to populate the field */
protected final Method getter;
/** Setter method in the mapped object used to store the value of field */
protected final Method setter;
/** Error message set on the field if required and not set by parser */
protected String ifRequiredMessage;
/** Does this field accept multiple values? */
protected final boolean isMultiValued;
/** Group to which the field belongs */
protected final Group group;
/** Is this field always required? This is only set through the XML file */
protected boolean alwaysRequired;
/**
* Value of the field if an error occurs while getting
* the value from the mapped object
*/
protected Object onError;
/** Default value of the field */
protected Object defaultValue;
/** Value of the field to use if the mapped parameter is empty or non-existant */
protected Object emptyValue;
/** Display size of the field */
private String displaySize;
/** Max size of the field */
private String maxSize;
// these are reset when the Field is returned to the pool
/** Has the field has been set from the parser? */
protected boolean setFlag;
/** Has the field passed the validation test? */
protected boolean validFlag;
/** Has the field been validated? */
protected boolean validated;
/** Does the field require a value? */
protected boolean required;
/** Has the field has been set from the parser? */
protected boolean initialized;
/** Error message, is any, resulting from validation */
protected String message;
/** Mapped object used to set the initial field value */
protected Retrievable retrievable;
private Locale locale;
/** String value of the field */
private String stringValue;
/** String valuess of the field if isMultiValued=true */
private String[] stringValues;
/** Stores the value of the field from the Retrievable object */
private Object validValue;
/** Stores the value of the field from the parser */
private Object testValue;
/** Used to pass testValue to the setter mathod through reflection */
private Object[] valArray;
/** The object containing the field data. */
protected ValueParser parser;
/** Logging */
protected Log log = LogFactory.getLog(this.getClass());
protected boolean isDebugEnabled = false;
/**
* Constructs a field based on data in the xml specification
* and assigns it to a Group.
*
* @param field a <code>XmlField</code> value
* @param group a <code>Group</code> value
* @throws IntakeException indicates the validator was not valid or
* could not be loaded.
* @throws SystemError only occurs is the Validation object does not
* extend InitableByConstraintMap
*/
public Field(XmlField field, Group group) throws IntakeException
{
isDebugEnabled = log.isDebugEnabled();
this.group = group;
key = field.getKey();
name = field.getName();
displayName = field.getDisplayName();
displaySize = field.getDisplaySize();
isMultiValued = field.isMultiValued();
try
{
setDefaultValue(field.getDefaultValue());
}
catch (RuntimeException e)
{
log.error("Could not set default value of " +
this.getDisplayName() + " to "
+ field.getDefaultValue(), e);
}
try
{
setEmptyValue(field.getEmptyValue());
}
catch (RuntimeException e)
{
log.error("Could not set empty value of " +
this.getDisplayName() + " to "
+ field.getEmptyValue(), e);
}
String validatorClassName = field.getValidator();
if (validatorClassName == null)
{
validatorClassName = getDefaultValidator();
}
else if (validatorClassName.indexOf('.') == -1)
{
validatorClassName = defaultValidatorPackage + validatorClassName;
}
if (validatorClassName != null)
{
try
{
validator = (Validator)
Class.forName(validatorClassName).newInstance();
}
catch (InstantiationException e)
{
throw new IntakeException(
"Could not create new instance of Validator("
+ validatorClassName + ")", e);
}
catch (IllegalAccessException e)
{
throw new IntakeException(
"Could not create new instance of Validator("
+ validatorClassName + ")", e);
}
catch (ClassNotFoundException e)
{
throw new IntakeException(
"Could not load Validator class("
+ validatorClassName + ")", e);
}
// this should always be true for now
// (until bean property initialization is implemented)
if (validator instanceof InitableByConstraintMap)
{
((InitableByConstraintMap) validator).init(field.getRuleMap());
}
else
{
throw new IntakeError(
"All Validation objects must be subclasses of "
+ "InitableByConstraintMap");
}
}
// field may have been declared as always required in the xml spec
Rule reqRule = (Rule) field.getRuleMap().get("required");
if (reqRule != null)
{
alwaysRequired = Boolean.valueOf(reqRule.getValue()).booleanValue();
ifRequiredMessage = reqRule.getMessage();
}
Rule maxLengthRule = (Rule) field.getRuleMap().get("maxLength");
if (maxLengthRule != null)
{
maxSize = maxLengthRule.getValue();
}
// map the getter and setter methods
mapToObject = field.getMapToObject();
String propName = field.getMapToProperty();
Method tmpGetter = null;
Method tmpSetter = null;
if (StringUtils.isNotEmpty(mapToObject)
&& StringUtils.isNotEmpty(propName))
{
try
{
tmpGetter = IntakeServiceFacade.getFieldGetter(mapToObject, propName);
}
catch (Exception e)
{
log.error("IntakeService could not map the getter for field "
+ this.getDisplayName() + " in group "
+ this.group.getIntakeGroupName()
+ " to the property " + propName + " in object "
+ mapToObject, e);
}
try
{
tmpSetter = IntakeServiceFacade.getFieldSetter(mapToObject, propName);
}
catch (Exception e)
{
log.error("IntakeService could not map the setter for field "
+ this.getDisplayName() + " in group "
+ this.group.getIntakeGroupName()
+ " to the property " + propName + " in object "
+ mapToObject, e);
}
}
getter = tmpGetter;
setter = tmpSetter;
valArray = new Object[1];
}
/**
* Method called when this field (the group it belongs to) is
* pulled from the pool. The request data is searched to determine
* if a value has been supplied for this field. If so, the value
* is validated.
*
* @param pp a <code>ValueParser</code> value
* @return a <code>Field</code> value
* @throws IntakeException this exception is only thrown by subclasses
* overriding this implementation.
*/
public Field init(ValueParser pp)
throws IntakeException
{
this.parser = pp;
validFlag = true;
validated = false;
this.locale = pp.getLocale();
if (pp.containsKey(getKey()))
{
if (isDebugEnabled)
{
log.debug(name + ": Found our Key in the request, setting Value");
}
if (pp.getString(getKey()) != null)
{
setFlag = true;
}
// validate();
}
else if (pp.containsKey(getValueIfAbsent()) &&
pp.getString(getValueIfAbsent()) != null)
{
pp.add(getKey(), pp.getString(getValueIfAbsent()));
setFlag = true;
// validate();
}
initialized = true;
return this;
}
/**
* Method called when this field or the group it belongs to is
* pulled from the pool. The retrievable object can provide
* a default value for the field, or using setProperty the field's
* value can be transferred to the retrievable.
*
* @param obj a <code>Retrievable</code> value
* @return a <code>Field</code> value
*/
public Field init(Retrievable obj)
{
if (!initialized)
{
validFlag = true;
validated = false;
}
retrievable = obj;
return this;
}
/**
* Returns the <code>Group</code> this field belongs to
* or <code>null</code> if unknown.
*
* @return The group this field belongs to.
*/
public Group getGroup()
{
return group;
}
/**
* Returns the <code>Locale</code> used when localizing data for
* this field, or <code>null</code> if unknown.
*
* @return Where to localize for.
*/
public Locale getLocale()
{
return locale;
}
/**
* Produces the fully qualified class name of the default validator.
*
* @return class name of the default validator
*/
protected String getDefaultValidator()
{
return DefaultValidator.class.getName();
}
/**
* Gets the Validator object for this field.
* @return a <code>Validator</code> object
*/
public Validator getValidator()
{
return validator;
}
/**
* Flag to determine whether the field has been declared as multi-valued.
*
* @return value of isMultiValued.
*/
public boolean isMultiValued()
{
return isMultiValued;
}
/**
* Flag to determine whether the field has been declared as required.
*
* @return value of required.
*/
public boolean isRequired()
{
return alwaysRequired || required;
}
/**
* Set whether this field is required to have a value. If the field
* is already required due to a setting in the XML file, this method
* can not set it to false.
*
* @param v Value to assign to required.
*/
public void setRequired(boolean v)
{
setRequired(v, ifRequiredMessage);
}
/**
* Set the value of required.
*
* @param v a <code>boolean</code> value
* @param message override the value from intake.xml
*/
public void setRequired(boolean v, String message)
{
this.required = v;
if (v && (!setFlag || null == getTestValue()))
{
validFlag = false;
this.message = message;
}
}
/**
* Removes references to this group and its fields from the
* query parameters
*/
public void removeFromRequest()
{
parser.remove(getKey());
parser.remove(getKey()+ VALUE_IF_ABSENT_KEY);
}
/**
* Disposes the object after use. The method is called
* when the Group is returned to its pool.
* if overridden, super.dispose() should be called.
*/
public void dispose()
{
parser = null;
initialized = false;
setFlag = false;
validFlag = false;
validated = false;
required = false;
message = null;
retrievable = null;
locale = null;
stringValue = null;
stringValues = null;
validValue = null;
testValue = null;
valArray[0] = null;
}
/**
* Get the key used to identify the field.
*
* @return the query data key.
*/
public String getKey()
{
return (group == null) ? key : group.getObjectKey() + key;
}
/**
* Use in a hidden field assign a default value in the event the
* field is absent from the query parameters. Used to track checkboxes,
* since they only show up if checked.
*/
public String getValueIfAbsent()
{
return getKey() + VALUE_IF_ABSENT_KEY;
}
/**
* Flag set to true, if the test value met the constraints.
* Is also true, in the case the test value was not set,
* unless this field has been marked as required.
*
* @return a <code>boolean</code> value
*/
public boolean isValid()
{
return validFlag;
}
/**
* Flag to determine whether the field has been validated.
*
* @return value of validated.
*/
public boolean isValidated()
{
return validated;
}
/**
* Flag set to true, if the test value has been set by the parser (even to
* an empty value, so don't used this to determine if the field contains a
* non-empty value). Validation will only be executed for fields that have
* been set in this manner.
*
* @return a <code>boolean</code> value
*/
public boolean isSet()
{
return setFlag;
}
/**
* Get the display name of the field. Useful for building
* data entry forms. Returns name of field if no display
* name has been assigned to the field by xml input file.
*
* @return a <code>String</code> value
*/
public String getDisplayName()
{
return (displayName == null) ? name : displayName;
}
/**
* Set the display name of the field. Display names are
* used in building data entry forms and serve as a
* user friendly description of the data contained in
* the field.
*/
public void setDisplayName(String newDisplayName)
{
displayName = newDisplayName;
}
/**
* Get any error message resulting from invalid input.
*
* @return a <code>String</code> value
*/
public String getMessage()
{
return (message == null) ? EMPTY : message;
}
/**
* Sets an error message. The field is also marked as invalid.
*/
public void setMessage(String message)
{
this.message = message;
validFlag = false;
}
/**
* @deprecated Call validate() instead (with no parameters).
*/
protected boolean validate(ValueParser pp)
{
return validate();
}
/**
* Compares request data with constraints and sets the valid flag.
*/
public boolean validate()
{
log.debug(name + ": validate()");
if (isMultiValued)
{
stringValues = parser.getStrings(getKey());
if (isDebugEnabled)
{
log.debug(name + ": Multi-Valued, Value is " + stringValue);
if (stringValues != null)
{
for (int i = 0; i < stringValues.length; i++)
{
log.debug(name + ": " + i + ". Value: " + stringValues[i]);
}
}
}
if (validator != null)
{
// set the test value as a String[] which might be replaced by
// the correct type if the input is valid.
setTestValue(stringValues);
try
{
validator.assertValidity(this);
}
catch (ValidationException ve)
{
setMessage(ve.getMessage());
}
}
if (validFlag)
{
doSetValue();
}
}
else
{
stringValue = parser.getString(getKey());
if (isDebugEnabled)
{
log.debug(name + ": Single Valued, Value is " + stringValue);
}
if (validator != null)
{
// set the test value as a String which might be replaced by
// the correct type if the input is valid.
setTestValue(parser.getString(getKey()));
try
{
validator.assertValidity(this);
log.debug(name + ": Value is ok");
doSetValue();
}
catch (ValidationException ve)
{
log.debug(name + ": Value failed validation!");
setMessage(ve.getMessage());
}
}
else
{
doSetValue();
}
}
validated = true;
return validFlag;
}
/**
* Set the default Value. This value is used if
* Intake should map this field to a new object.
*
* @param prop The value to use if the field is mapped to a new object.
*/
public abstract void setDefaultValue(String prop);
/**
* Set the empty Value. This value is used if Intake
* maps a field to a parameter returned by the user and
* the corresponding field is either empty (empty string)
* or non-existant.
*
* @param prop The value to use if the field is empty.
*/
public abstract void setEmptyValue(String prop);
/**
* @deprecated Use doSetValue() instead (with no parameters).
*/
protected void doSetValue(ValueParser pp)
{
doSetValue();
}
/**
* Sets the value of the field from data in the parser.
*/
protected abstract void doSetValue();
/**
* Set the value used as a default, in the event the field
* has not been set yet.
*
* @param obj an <code>Object</code> value
*/
void setInitialValue(Object obj)
{
validValue = obj;
}
/**
* Get the value used as a default. If the initial value has
* not been set and a <code>Retrievable</code> object has
* been associated with this field, the objects property will
* be used as the initial value.
*
* @return an <code>Object</code> value
* @exception IntakeException indicates the value could not be
* returned from the mapped object
*/
public Object getInitialValue() throws IntakeException
{
if (validValue == null)
{
if (retrievable != null)
{
getProperty(retrievable);
}
else
{
getDefault();
}
}
return validValue;
}
/**
* Set the value input by a user that will be validated.
*
* @param obj an <code>Object</code> value
*/
void setTestValue(Object obj)
{
testValue = obj;
}
/**
* Get the value input by a user that will be validated.
*
* @return an <code>Object</code> value
*/
public Object getTestValue()
{
return testValue;
}
/**
* Get the value of the field. if a test value has been set, it
* will be returned as is, unless it is so badly formed that the
* validation could not parse it. In most cases the test value
* is returned even though invalid, so that it can be returned to
* the user to make modifications. If the test value is not set
* the initial value is returned.
*
* @return an <code>Object</code> value
*/
public Object getValue()
{
Object val = null;
try
{
val = getInitialValue();
}
catch (IntakeException e)
{
log.error("Could not get intial value of " + this.getDisplayName() +
" in group " + this.group.getIntakeGroupName(), e);
}
if (getTestValue() != null)
{
val = getTestValue();
}
if (val == null)
{
val = onError;
}
return val;
}
/**
* Calls toString() on the object returned by getValue(),
* unless null; and then it returns "", the empty String.
*
* @return a <code>String</code> value
*/
public String toString()
{
String res = EMPTY;
if (stringValue != null)
{
res = stringValue;
}
else if (getValue() != null)
{
res = getValue().toString();
}
return res;
}
/**
* Calls toString() on the object returned by getValue(),
* unless null; and then it returns "", the empty String.
* Escapes " characters to be able to display these
* in HTML form fields.
*
* @return a <code>String</code> value
*/
public String getHTMLString()
{
String res = toString();
return StringUtils.replace(res, "\"", """);
}
/**
* Loads the valid value from a bean
*
* @throws IntakeException indicates a problem during the execution of the
* object's getter method
*/
public void getProperty(Object obj)
throws IntakeException
{
try
{
validValue = getter.invoke(obj, (Object[])null);
}
catch (IllegalAccessException e)
{
throwSetGetException("getter", obj, this.getDisplayName(),
this.group.getIntakeGroupName(), e);
}
catch (IllegalArgumentException e)
{
throwSetGetException("getter", obj, this.getDisplayName(),
this.group.getIntakeGroupName(), e);
}
catch (InvocationTargetException e)
{
throwSetGetException("getter", obj, this.getDisplayName(),
this.group.getIntakeGroupName(), e);
}
}
/**
* Loads the default value from the object
*/
public void getDefault()
{
validValue = getDefaultValue();
}
/**
* Calls a setter method on obj, if this field has been set.
*
* @throws IntakeException indicates a problem during the execution of the
* object's setter method
*/
public void setProperty(Object obj) throws IntakeException
{
if (isDebugEnabled)
{
log.debug(name + ".setProperty(" + obj.getClass().getName() + ")");
}
if (!isValid())
{
throw new IntakeException(
"Attempted to assign an invalid input.");
}
if (isSet() && null != getTestValue())
{
valArray[0] = getTestValue();
if (isDebugEnabled)
{
log.debug(name + ": Property is set, value is " + valArray[0]);
}
}
else
{
valArray[0] = getSafeEmptyValue();
if (isDebugEnabled)
{
log.debug(name + ": Property is not set, using emptyValue " + valArray[0]);
}
}
try
{
/*
* In the case we map a Group to an Object using mapToObject, and we
* want to add an additional Field which should not be mapped, and
* we leave the mapToProperty empty, we will get a NPE here. So we
* have to double check, if we really have a setter set.
*/
if(setter != null)
{
setter.invoke(obj, valArray);
}
else if (isDebugEnabled)
{
log.debug(name + ": has a null setter for the mapToProperty"
+ " Attribute, although all Fields should be mapped"
+ " to " + mapToObject + ". If this is unwanted, you"
+ " should double check the mapToProperty Attribute, and"
+ " consult the logs. The Turbine Intake Service will"
+ " have logged a detailed Message with the error.");
}
}
catch (IllegalAccessException e)
{
throwSetGetException("setter", obj, this.getDisplayName(),
this.group.getIntakeGroupName(), e);
}
catch (IllegalArgumentException e)
{
throwSetGetException("setter", obj, this.getDisplayName(),
this.group.getIntakeGroupName(), e);
}
catch (InvocationTargetException e)
{
throwSetGetException("setter", obj, this.getDisplayName(),
this.group.getIntakeGroupName(), e);
}
}
/**
* Used to throw an IntakeException when an error occurs execuing the
* get/set method of the mapped persistent object.
*
* @param type Type of method. (setter/getter)
* @param fieldName Name of the field
* @param groupName Name of the group
* @param e Exception that was thrown
* @throws IntakeException New exception with formatted message
*/
private void throwSetGetException(String type, Object obj,
String fieldName, String groupName,
Exception e)
throws IntakeException
{
throw new IntakeException("Could not execute " + type
+ " method for " + fieldName + " in group " + groupName
+ " on " + obj.getClass().getName(), e);
}
/**
* Get the default Value
*
* @return the default value
*/
public Object getDefaultValue()
{
return defaultValue;
}
/**
* Get the Value to use if the field is empty
*
* @return the value to use if the field is empty.
*/
public Object getEmptyValue()
{
return emptyValue;
}
/**
* Provides access to emptyValue such that the value returned will be
* acceptable as an argument parameter to Method.invoke. Subclasses
* that deal with primitive types should ensure that they return an
* appropriate value wrapped in the object wrapper class for the
* primitive type.
*
* @return the value to use when the field is empty or an Object that
* wraps the empty value for primitive types.
*/
protected Object getSafeEmptyValue()
{
return getEmptyValue();
}
/**
* Gets the name of the field.
*
* @return name of the field as specified in the XML file.
*/
public String getName()
{
return name;
}
/**
* Gets the diplay size of the field. This is useful when
* building the HTML input tag. If no displaySize was set,
* an empty string is returned.
*/
public String getDisplaySize()
{
return (StringUtils.isEmpty(displaySize) ? "" : displaySize);
}
/**
* Gets the maximum size of the field. This is useful when
* building the HTML input tag. The maxSize is set with the maxLength
* rule. If this rul was not set, an enmpty string is returned.
*/
public String getMaxSize()
{
return (StringUtils.isEmpty(maxSize) ? "" : maxSize);
}
/**
* Gets the String representation of the Value. This is basically a wrapper
* method for the toString method which doesn't seem to show anything on
* screen if accessed from Template. Name is also more in line with getValue
* method which returns the actual Object.
* This is useful for displaying correctly formatted data such as dates,
* such as 18/11/1968 instead of the toString dump of a Date Object.
*
* @return the String Value
*/
public String getStringValue()
{
return this.toString();
}
}