org.apache.beehive.controls.runtime.bean.AnnotationConstraintValidator Maven / Gradle / Ivy
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/*
* 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.
*
* $Header:$
*/
package org.apache.beehive.controls.runtime.bean;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.text.ParsePosition;
import java.util.Date;
import org.apache.beehive.controls.api.bean.AnnotationMemberTypes;
import org.apache.beehive.controls.api.bean.AnnotationConstraints.MembershipRule;
import org.apache.beehive.controls.api.bean.AnnotationConstraints.MembershipRuleValues;
import org.apache.beehive.controls.api.properties.PropertyKey;
/**
* This class offers methods for validating values assigned to a control property.
* The validation process will ensure
* 1. The value is appropriate for the property's property type
* 2. The value satisfies the constraints defined on the property type
* 3. The value satisfies the constraints defined on the property set that the property is defined in.
* Refer to {@link org.apache.beehive.controls.api.bean.AnnotationMemberTypes AnnotationMemberTypes} and
* {@link org.apache.beehive.controls.api.bean.AnnotationConstraints AnnotationConstraints} for more
* information on property constraints.
*/
public class AnnotationConstraintValidator
{
public AnnotationConstraintValidator()
{
super();
}
/**
* This method ensures that any control property value assignment satisfies
* all property constraints. This method should be called by control
* property setters to ensure values assigned to properties at runtime are
* validated.
*
* @param key
* The property that the specified key is assigned to
* @param value
* The value assigned to the specified property key
* @throws IllegalArgumentException
* when the value assigned to the specified property key does
* not satisfy a property constraint.
*/
public static void validate(PropertyKey key, Object value)
throws IllegalArgumentException
{
validate(key.getAnnotations(), value);
}
/**
* This method ensures the membership constraints defined on a property set
* is satisfied.
*
* @param propertySet the property set to validate
*/
public static void validateMembership(Annotation propertySet)
{
Class c = propertySet.annotationType();
MembershipRule rule = (MembershipRule) c.getAnnotation(MembershipRule.class);
if (rule == null)
return;
MembershipRuleValues ruleValue = rule.value();
String[] memberNames = rule.memberNames();
Method[] members = getMembers(c, memberNames);
int i = getNumOfMembersSet(propertySet, members);
if (ruleValue == MembershipRuleValues.ALL_IF_ANY)
{
if (i != 0 && i != members.length)
throw new IllegalArgumentException("The membership rule on " + propertySet.toString() +
" is not satisfied. Either all members must be set or none is set");
}
else if (ruleValue == MembershipRuleValues.EXACTLY_ONE)
{
if (i != 1)
throw new IllegalArgumentException("The membership rule on " + propertySet.toString() +
" is not satisfied. Exactly one member must be set");
}
else if (ruleValue == MembershipRuleValues.AT_LEAST_ONE)
{
if (i < 1)
throw new IllegalArgumentException("The membership rule on " + propertySet.toString() +
" is not satisfied. At least one member must be set");
}
else if (ruleValue == MembershipRuleValues.AT_MOST_ONE)
{
if (i > 1)
throw new IllegalArgumentException("The membership rule on " + propertySet.toString() +
" is not satisfied. At most one member may be set");
}
}
private static Method[] getMembers(Class c, String[] memberNames)
{
Method[] methods = null;
if (memberNames == null || memberNames.length == 0)
{
methods = c.getDeclaredMethods();
}
else
{
methods = new Method[memberNames.length];
for (int i = 0; i < memberNames.length; i++)
{
try
{
methods[i] = c.getMethod(memberNames[i], (Class[]) null);
}
catch (Exception e)
{
// method is not found, so the member is ignored.
}
}
}
return methods;
}
private static int getNumOfMembersSet(Annotation propertySet,
Method[] members)
{
int num = 0;
for (Method m : members)
{
Class returnType = m.getReturnType();
Object o = null;
try
{
o = m.invoke(propertySet, (Object[]) null);
}
catch (Exception e)
{
// This should never happen.
throw new RuntimeException(e);
}
if ((returnType == String.class && !((String) o)
.equals(AnnotationMemberTypes.OPTIONAL_STRING))
|| (returnType == int.class && ((Integer) o).intValue() != AnnotationMemberTypes.OPTIONAL_INT)
|| (returnType == short.class && ((Short) o)
.shortValue() != AnnotationMemberTypes.OPTIONAL_SHORT)
|| (returnType == long.class && ((Long) o).longValue() != AnnotationMemberTypes.OPTIONAL_LONG)
|| (returnType == float.class && ((Float) o)
.floatValue() != AnnotationMemberTypes.OPTIONAL_FLOAT)
|| (returnType == double.class && ((Double) o)
.doubleValue() != AnnotationMemberTypes.OPTIONAL_DOUBLE)
|| (returnType == char.class && ((Character) o)
.charValue() != AnnotationMemberTypes.OPTIONAL_CHAR)
|| (returnType == byte.class && ((Byte) o).byteValue() != AnnotationMemberTypes.OPTIONAL_BYTE)
|| (returnType == boolean.class && !((Boolean) o)
.booleanValue()))
num++;
}
return num;
}
protected static synchronized void validate(Annotation[] annotations,
Object value) throws IllegalArgumentException
{
// Determine if the member is optional. This is done in a separate loop
// because a control property may have multiple constraints and the
// optional
// annotation may be declared after another constraint annotation.
boolean optional = false;
for (Annotation a : annotations)
{
if (a instanceof AnnotationMemberTypes.Optional)
{
optional = true;
break;
}
}
for (Annotation a : annotations)
{
if (a instanceof AnnotationMemberTypes.Text)
validateText((AnnotationMemberTypes.Text) a, value, optional);
else if (a instanceof AnnotationMemberTypes.Decimal)
validateDecimal((AnnotationMemberTypes.Decimal) a, value,
optional);
else if (a instanceof AnnotationMemberTypes.Int)
validateInt((AnnotationMemberTypes.Int) a, value, optional);
else if (a instanceof AnnotationMemberTypes.Date)
validateDate((AnnotationMemberTypes.Date) a, value, optional);
else if (a instanceof AnnotationMemberTypes.FilePath)
validateFilePath((AnnotationMemberTypes.FilePath) a, value,
optional);
else if (a instanceof AnnotationMemberTypes.JndiName)
validateJndiName((AnnotationMemberTypes.JndiName) a, value,
optional);
else if (a instanceof AnnotationMemberTypes.QName)
validateQName((AnnotationMemberTypes.QName) a, value, optional);
else if (a instanceof AnnotationMemberTypes.URI)
validateURI((AnnotationMemberTypes.URI) a, value, optional);
else if (a instanceof AnnotationMemberTypes.URL)
validateURL((AnnotationMemberTypes.URL) a, value, optional);
else if (a instanceof AnnotationMemberTypes.URN)
validateURN((AnnotationMemberTypes.URN) a, value, optional);
else if (a instanceof AnnotationMemberTypes.XML)
validateXML((AnnotationMemberTypes.XML) a, value, optional);
}
}
private static void validateXML(AnnotationMemberTypes.XML a, Object value,
boolean optional)
{
}
private static void validateURN(AnnotationMemberTypes.URN a, Object value,
boolean optional)
{
if (optional
&& (value == null || value
.equals(AnnotationMemberTypes.OPTIONAL_STRING)))
return;
if (!(value instanceof String))
{
error("The value, "
+ value
+ ", assigned to an URN property must be of type java.lang.String.");
}
URI.create((String) value);
}
private static void validateURL(AnnotationMemberTypes.URL a, Object value,
boolean optional)
{
if (optional
&& (value == null || value
.equals(AnnotationMemberTypes.OPTIONAL_STRING)))
return;
if (!(value instanceof String))
{
error("The value, "
+ value
+ ", assigned to an URL property must be of type java.lang.String.");
}
try
{
new URL((String) value);
}
catch (MalformedURLException mue)
{
error("The value, " + value
+ ", assigned to the URL property is a malformed URL.", mue);
}
}
private static void validateURI(AnnotationMemberTypes.URI a, Object value, boolean optional)
{
if (optional
&& (value == null || value
.equals(AnnotationMemberTypes.OPTIONAL_STRING)))
return;
if (!(value instanceof String))
{
error("The value, "
+ value
+ ", assigned to an URI property must be of type java.lang.String.");
}
URI.create((String) value);
}
private static void validateQName(AnnotationMemberTypes.QName a, Object value, boolean optional)
{
}
private static void validateJndiName(AnnotationMemberTypes.JndiName a, Object value, boolean optional)
{
}
private static void validateFilePath(AnnotationMemberTypes.FilePath a, Object value, boolean optional)
{
if (optional
&& (value == null || value
.equals(AnnotationMemberTypes.OPTIONAL_STRING)))
return;
if (!(value instanceof String))
{
error("The value, "
+ value
+ ", assigned to a FilePath property must be of type java.lang.String.");
}
//Temporarily commenting out the following check on FilePath until
//an agreement is reached on what is a valid FilePath.
//
// File file = new File((String) value);
// if (!file.isFile() || !file.canRead())
// {
// error("The value, "
// + value
// + ", assigned to a FilePath property must be a readable file.");
// }
}
private static void validateDate(AnnotationMemberTypes.Date a, Object value, boolean optional) {
if (optional && (value == null || value.equals(AnnotationMemberTypes.OPTIONAL_STRING)))
return;
if (!(value instanceof String))
error("The value, "
+ value
+ ", assigned to a date property must be of type java.lang.String.");
String format = a.format();
Date date = null;
try {
date = parseDate(format , (String)value);
} catch (ParseException pe) {
error("The value, "
+ value
+ ", assigned to a date property is not in the specified format of: "
+ format);
}
String minValue = a.minValue();
if (minValue != null && minValue.length() > 0) {
Date minDate = null;
try {
minDate = parseDate(format, a.minValue());
} catch (ParseException pe) {
error("The value, "
+ minValue
+ ", assigned to minValue date constraint property is not in the specified format of: "
+ format);
}
if (minDate.compareTo(date) > 0) {
error("The value, "
+ value
+ ", assigned to a date property is earlier than the earliest date allowed: "
+ minValue);
}
}
String maxValue = a.maxValue();
if (maxValue != null && maxValue.length() > 0) {
Date maxDate = null;
try {
maxDate = parseDate(format, a.maxValue());
} catch (ParseException pe) {
error("The value, "
+ maxValue
+ ", assigned to maxValue date constraint property is not in the specified format of: "
+ format);
}
if (maxDate.compareTo(date) < 0) {
error("The date, "
+ value
+ ", assigned to a date property is later than the latest date allowed: "
+ maxValue);
}
}
}
/**
* Parse a date value into the specified format. Pay special attention to the case of the value
* having trailing characters, ex. 12/02/2005xx which will not cause the parse of the date to fail
* but should be still treated as an error for our purposes.
*
* @param format Format string for the date.
* @param value A String containing the date value to parse.
* @return A Date instance if the parse was successful.
* @throws ParseException If the value is not a valid date.
*/
public static Date parseDate(String format, String value)
throws ParseException {
SimpleDateFormat sdFormat = new SimpleDateFormat(format);
sdFormat.setLenient(false);
ParsePosition pp = new ParsePosition(0);
Date d = sdFormat.parse(value, pp);
/*
a date value such as: 12/01/2005x will not cause a parse error,
use the parse position to detect this case.
*/
if (d == null || pp.getIndex() < value.length())
throw new ParseException("Parsing date value, "
+ value
+ ", failed at index " + pp.getIndex(), pp.getIndex());
else return d;
}
/**
* @param value
*/
private static void validateInt(AnnotationMemberTypes.Int a, Object value, boolean optional) {
if (optional
&& (value == null ||
value.equals(AnnotationMemberTypes.OPTIONAL_STRING) ||
value.equals(AnnotationMemberTypes.OPTIONAL_INT)))
return;
int intValue = 0;
if (value instanceof String)
{
try
{
intValue = Integer.parseInt((String) value);
}
catch (NumberFormatException nfe)
{
error("The value ,"
+ value
+ ", assigned to an int property does not represent an integer.");
}
}
else if (value instanceof Integer)
{
intValue = ((Integer) value).intValue();
}
else
{
error("The value, "
+ value
+ ", assigned to an int property must be of type java.lang.String or int.");
}
if (intValue < a.minValue())
error("The value, "
+ intValue
+ ", assigned to an int property is less than the minimum value allowed: "
+ a.minValue() + ".");
else if (intValue > a.maxValue())
error("The value, "
+ intValue
+ ", assigned to an int property exeeds the maximum value allowed: "
+ a.maxValue() + ".");
}
private static void validateDecimal(AnnotationMemberTypes.Decimal a,
Object value, boolean optional)
{
if (optional
&& (value == null ||
value.equals(AnnotationMemberTypes.OPTIONAL_STRING) ||
value.equals(AnnotationMemberTypes.OPTIONAL_FLOAT) ||
value.equals(AnnotationMemberTypes.OPTIONAL_DOUBLE)))
return;
double doubleValue = 0;
String doubleString = null;
if (value instanceof String)
{
doubleValue = Double.parseDouble((String)value);
doubleString = (String)value;
}
else if (value instanceof Float)
{
doubleValue = ((Float)value).doubleValue();
doubleString = ((Float)value).toString();
}
else if (value instanceof Double)
{
doubleValue = ((Double)value).doubleValue();
doubleString = ((Double)value).toString();
}
else
{
error("The value, "
+ value
+ ", assigned to a decimal property must be of type float, double, or java.lang.String.");
}
if (doubleValue < a.minValue())
error("The value, "
+ doubleValue
+ ", assigned to a decimal property is less than the the minimum value allowed: "
+ a.minValue() + ".");
if (doubleValue > a.maxValue())
error("The value, "
+ doubleValue
+ ", assigned to a decimal property exceeds the maximum value allowed: "
+ a.maxValue() + ".");
int decimalPos = doubleString.indexOf('.');
if (decimalPos == -1 || a.places() == AnnotationMemberTypes.UNLIMITED_PLACES)
return;
if (doubleString.length() - decimalPos - 1 > a.places())
error("The decimal places in the value, " + doubleString
+ ", assigned to a decimal property exceeds " + a.places()
+ ", the number of decimal places allowed.");
}
private static void validateText(AnnotationMemberTypes.Text a,
Object value, boolean optional)
{
if (optional
&& (value == null || value
.equals(AnnotationMemberTypes.OPTIONAL_STRING)))
return;
if (!(value instanceof String))
error("The value, "
+ value
+ ", assigned to a text property must be of type java.lang.String.");
String str = (String) value;
if (str.length() > a.maxLength())
error("The value, "
+ str
+ ", assigned to a text property exceeds the maximum length allowed: "
+ a.maxLength());
if (a.isLong())
{
try
{
Long.parseLong(str);
}
catch (NumberFormatException nfe)
{
error("The value, "
+ str
+ ", assigned to a text property with a long number constraint does not represent a long number.");
}
}
}
private static void error(String message)
{
error(message, null);
}
private static void error(String message, Throwable t)
{
throw new IllegalArgumentException(message, t);
}
}