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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: 1713845 $ $Date: 2015-11-11 15:02:16 +0100 (Wed, 11 Nov 2015) $
 *
 * @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.");
        }
    }

}