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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.
*/
package org.apache.commons.collections.functors;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Collection;
import java.util.Iterator;
import org.apache.commons.collections.Closure;
import org.apache.commons.collections.Predicate;
import org.apache.commons.collections.Transformer;
/**
* Internal utilities for functors.
*
* @since Commons Collections 3.0
* @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
*
* @author Stephen Colebourne
* @author Matt Benson
*/
class FunctorUtils {
/** System property key to enable unsafe serialization */
final static String UNSAFE_SERIALIZABLE_PROPERTY
= "org.apache.commons.collections.enableUnsafeSerialization";
/**
* Restricted constructor.
*/
private FunctorUtils() {
super();
}
/**
* Clone the predicates to ensure that the internal reference can't be messed with.
*
* @param predicates the predicates to copy
* @return the cloned predicates
*/
static Predicate[] copy(Predicate[] predicates) {
if (predicates == null) {
return null;
}
return (Predicate[]) predicates.clone();
}
/**
* Validate the predicates to ensure that all is well.
*
* @param predicates the predicates to validate
*/
static void validate(Predicate[] predicates) {
if (predicates == null) {
throw new IllegalArgumentException("The predicate array must not be null");
}
for (int i = 0; i < predicates.length; i++) {
if (predicates[i] == null) {
throw new IllegalArgumentException("The predicate array must not contain a null predicate, index " + i + " was null");
}
}
}
/**
* Validate the predicates to ensure that all is well.
*
* @param predicates the predicates to validate
* @return predicate array
*/
static Predicate[] validate(Collection predicates) {
if (predicates == null) {
throw new IllegalArgumentException("The predicate collection must not be null");
}
// convert to array like this to guarantee iterator() ordering
Predicate[] preds = new Predicate[predicates.size()];
int i = 0;
for (Iterator it = predicates.iterator(); it.hasNext();) {
preds[i] = (Predicate) it.next();
if (preds[i] == null) {
throw new IllegalArgumentException("The predicate collection must not contain a null predicate, index " + i + " was null");
}
i++;
}
return preds;
}
/**
* Clone the closures to ensure that the internal reference can't be messed with.
*
* @param closures the closures to copy
* @return the cloned closures
*/
static Closure[] copy(Closure[] closures) {
if (closures == null) {
return null;
}
return (Closure[]) closures.clone();
}
/**
* Validate the closures to ensure that all is well.
*
* @param closures the closures to validate
*/
static void validate(Closure[] closures) {
if (closures == null) {
throw new IllegalArgumentException("The closure array must not be null");
}
for (int i = 0; i < closures.length; i++) {
if (closures[i] == null) {
throw new IllegalArgumentException("The closure array must not contain a null closure, index " + i + " was null");
}
}
}
/**
* Copy method
*
* @param transformers the transformers to copy
* @return a clone of the transformers
*/
static Transformer[] copy(Transformer[] transformers) {
if (transformers == null) {
return null;
}
return (Transformer[]) transformers.clone();
}
/**
* Validate method
*
* @param transformers the transformers to validate
*/
static void validate(Transformer[] transformers) {
if (transformers == null) {
throw new IllegalArgumentException("The transformer array must not be null");
}
for (int i = 0; i < transformers.length; i++) {
if (transformers[i] == null) {
throw new IllegalArgumentException(
"The transformer array must not contain a null transformer, index " + i + " was null");
}
}
}
/**
* Package-private helper method to check if serialization support is
* enabled for unsafe classes.
*
* @param clazz the clazz to check for serialization support
* @throws UnsupportedOperationException if unsafe serialization is disabled
*/
static void checkUnsafeSerialization(Class clazz) {
String unsafeSerializableProperty;
try {
unsafeSerializableProperty =
(String) AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
return System.getProperty(UNSAFE_SERIALIZABLE_PROPERTY);
}
});
} catch (SecurityException ex) {
unsafeSerializableProperty = null;
}
if (!"true".equalsIgnoreCase(unsafeSerializableProperty)) {
throw new UnsupportedOperationException(
"Serialization support for " + clazz.getName() + " is disabled for security reasons. " +
"To enable it set system property '" + UNSAFE_SERIALIZABLE_PROPERTY + "' to 'true', " +
"but you must ensure that your application does not de-serialize objects from untrusted sources.");
}
}
}
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