package com.gooddata;

import java.util.Collection;

import java.util.Iterator;

/**

* Validation utils

*/

public abstract class Validate {

public static <T> T notNull(T value, String aargument) {

if (value == null) {

throw new IllegalArgumentException(aargument + " can't be null");

}

return value;

}

public static <T extends CharSequence> T notEmpty(T value, String argument) {

notNull(value, argument);

if (value.toString().trim().length() == 0) {

throw new IllegalArgumentException(argument + " can't be empty");

}

return value;

}

public static <T extends Collection> T noNullElements(T collection, String argument) {

notNull(collection, argument);

int i = 0;

for (Iterator it = collection.iterator(); it.hasNext(); i++) {

if (it.next() == null) {

throw new IllegalArgumentException(argument + " contains null element at index: " + i);

}

}

return collection;

}

}