package com.twelvemonkeys.lang;
import java.util.Arrays;
import java.util.Collection;
import java.util.Map;
/**
* Kind of like {@code org.apache.commons.lang.Validate}. Just smarter. ;-)
* <p/>
* Uses type parameterized return values, thus making it possible to check
* constructor arguments before
* they are passed on to {@code super} or {@code this} type constructors.
*
* @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
* @author last modified by $Author: haku $
* @version $Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-core/src/main/java/com/twelvemonkeys/lang/Validate.java#1 $
*/
public final class Validate {
// TODO: Make it possible to throw IllegalStateException instead of IllegalArgumentException?
private static final String UNSPECIFIED_PARAM_NAME = "method parameter";
private Validate() {}
// Not null...
public static <T> T notNull(final T pParameter) {
return notNull(pParameter, null);
}
public static <T> T notNull(final T pParameter, final String pParamName) {
if (pParameter == null) {
throw new IllegalArgumentException(String.format("%s may not be null", pParamName == null ? UNSPECIFIED_PARAM_NAME : pParamName));
}
return pParameter;
}
// Not empty
public static <T extends CharSequence> T notEmpty(final T pParameter) {
return notEmpty(pParameter, null);
}
public static <T extends CharSequence> T notEmpty(final T pParameter, final String pParamName) {
if (pParameter == null || pParameter.length() == 0 || isOnlyWhiteSpace(pParameter)) {
throw new IllegalArgumentException(String.format("%s may not be blank", pParamName == null ? UNSPECIFIED_PARAM_NAME : pParamName));
}
return pParameter;
}
private static <T extends CharSequence> boolean isOnlyWhiteSpace(T pParameter) {
for (int i = 0; i < pParameter.length(); i++) {
if (!Character.isWhitespace(pParameter.charAt(i))) {
return false;
}
}
return true;
}
public static <T> T[] notEmpty(final T[] pParameter) {
return notEmpty(pParameter, null);
}
public static <T> T[] notEmpty(final T[] pParameter, final String pParamName) {
if (pParameter == null || pParameter.length == 0) {
throw new IllegalArgumentException(String.format("%s may not be empty", pParamName == null ? UNSPECIFIED_PARAM_NAME : pParamName));
}
return pParameter;
}
public static <T> Collection<T> notEmpty(final Collection<T> pParameter) {
return notEmpty(pParameter, null);
}
public static <T> Collection<T> notEmpty(final Collection<T> pParameter, final String pParamName) {
if (pParameter == null || pParameter.isEmpty()) {
throw new IllegalArgumentException(String.format("%s may not be empty", pParamName == null ? UNSPECIFIED_PARAM_NAME : pParamName));
}
return pParameter;
}
public static <K, V> Map<K, V> notEmpty(final Map<K, V> pParameter) {
return notEmpty(pParameter, null);
}
public static <K, V> Map<K, V> notEmpty(final Map<K, V> pParameter, final String pParamName) {
if (pParameter == null || pParameter.isEmpty()) {
throw new IllegalArgumentException(String.format("%s may not be empty", pParamName == null ? UNSPECIFIED_PARAM_NAME : pParamName));
}
return pParameter;
}
// No null elements
public static <T> T[] noNullElements(final T[] pParameter) {
return noNullElements(pParameter, null);
}
public static <T> T[] noNullElements(final T[] pParameter, final String pParamName) {
noNullElements(pParameter == null ? null : Arrays.asList(pParameter), pParamName);
return pParameter;
}
public static <T> Collection<T> noNullElements(final Collection<T> pParameter) {
return noNullElements(pParameter, null);
}
public static <T> Collection<T> noNullElements(final Collection<T> pParameter, final String pParamName) {
notNull(pParameter, pParamName);
for (T element : pParameter) {
if (element == null) {
throw new IllegalArgumentException(String.format("%s may not contain null elements", pParamName == null ? UNSPECIFIED_PARAM_NAME : pParamName));
}
}
return pParameter;
}
public static <K, V> Map<K, V> noNullValues(final Map<K, V> pParameter) {
return noNullValues(pParameter, null);
}
public static <K, V> Map<K, V> noNullValues(final Map<K, V> pParameter, final String pParamName) {
notNull(pParameter, pParamName);
for (V value : pParameter.values()) {
if (value == null) {
throw new IllegalArgumentException(String.format("%s may not contain null values", pParamName == null ? UNSPECIFIED_PARAM_NAME : pParamName));
}
}
return pParameter;
}
public static <K, V> Map<K, V> noNullKeys(final Map<K, V> pParameter) {
return noNullKeys(pParameter, null);
}
public static <K, V> Map<K, V> noNullKeys(final Map<K, V> pParameter, final String pParamName) {
notNull(pParameter, pParamName);
for (K key : pParameter.keySet()) {
if (key == null) {
throw new IllegalArgumentException(String.format("%s may not contain null keys", pParamName == null ? UNSPECIFIED_PARAM_NAME : pParamName));
}
}
return pParameter;
}
// Is true
public static boolean isTrue(final boolean pExpression, final String pMessage) {
return isTrue(pExpression, pExpression, pMessage);
}
public static <T> T isTrue(final boolean condition, final T value, final String message) {
if (!condition) {
throw new IllegalArgumentException(String.format(message == null ? "expression may not be %s" : message, value));
}
return value;
}
}