jodd.util.Util Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of redisson-all Show documentation
Show all versions of redisson-all Show documentation
Redis based In-Memory Data Grid for Java
// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
package jodd.util;
import java.lang.reflect.Array;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;
import java.util.Objects;
/**
* Some general utilities.
* All methods are safe as possible and operates with as many types as possible.
*/
public class Util {
/**
* Returns string representation of an object, while checking for null.
*/
public static String toString(final Object value) {
if (value == null) {
return null;
}
return value.toString();
}
// ---------------------------------------------------------------- misc
/**
* Returns length of the object. Returns 0 for null.
* Returns -1 for objects without a length.
*/
public static int length(final Object obj) {
if (obj == null) {
return 0;
}
if (obj instanceof CharSequence) {
return ((CharSequence) obj).length();
}
if (obj instanceof Collection) {
return ((Collection) obj).size();
}
if (obj instanceof Map) {
return ((Map) obj).size();
}
int count;
if (obj instanceof Iterator) {
final Iterator iter = (Iterator) obj;
count = 0;
while (iter.hasNext()) {
count++;
iter.next();
}
return count;
}
if (obj instanceof Enumeration) {
final Enumeration enumeration = (Enumeration) obj;
count = 0;
while (enumeration.hasMoreElements()) {
count++;
enumeration.nextElement();
}
return count;
}
if (obj.getClass().isArray()) {
return Array.getLength(obj);
}
return -1;
}
/**
* Returns true if first argument contains provided element.
* It works for strings, collections, maps and arrays.
s */
public static boolean containsElement(final Object obj, final Object element) {
if (obj == null) {
return false;
}
if (obj instanceof String) {
if (element == null) {
return false;
}
return ((String) obj).contains(element.toString());
}
if (obj instanceof Collection) {
return ((Collection) obj).contains(element);
}
if (obj instanceof Map) {
return ((Map) obj).values().contains(element);
}
if (obj instanceof Iterator) {
final Iterator iter = (Iterator) obj;
while (iter.hasNext()) {
final Object o = iter.next();
if (Objects.equals(o, element)) {
return true;
}
}
return false;
}
if (obj instanceof Enumeration) {
final Enumeration enumeration = (Enumeration) obj;
while (enumeration.hasMoreElements()) {
final Object o = enumeration.nextElement();
if (Objects.equals(o, element)) {
return true;
}
}
return false;
}
if (obj.getClass().isArray()) {
final int len = Array.getLength(obj);
for (int i = 0; i < len; i++) {
final Object o = Array.get(obj, i);
if (Objects.equals(o, element)) {
return true;
}
}
}
return false;
}
/**
* Converts object into pretty string. All arrays are iterated.
*/
public static String toPrettyString(final Object value) {
if (value == null) {
return StringPool.NULL;
}
final Class type = value.getClass();
if (type.isArray()) {
final Class componentType = type.getComponentType();
if (componentType.isPrimitive()) {
final StringBuilder sb = new StringBuilder();
sb.append('[');
if (componentType == int.class) {
sb.append(ArraysUtil.toString((int[]) value));
}
else if (componentType == long.class) {
sb.append(ArraysUtil.toString((long[]) value));
}
else if (componentType == double.class) {
sb.append(ArraysUtil.toString((double[]) value));
}
else if (componentType == float.class) {
sb.append(ArraysUtil.toString((float[]) value));
}
else if (componentType == boolean.class) {
sb.append(ArraysUtil.toString((boolean[]) value));
}
else if (componentType == short.class) {
sb.append(ArraysUtil.toString((short[]) value));
}
else if (componentType == byte.class) {
sb.append(ArraysUtil.toString((byte[]) value));
} else {
throw new IllegalArgumentException();
}
sb.append(']');
return sb.toString();
} else {
final StringBuilder sb = new StringBuilder();
sb.append('[');
final Object[] array = (Object[]) value;
for (int i = 0; i < array.length; i++) {
if (i > 0) {
sb.append(',');
}
sb.append(toPrettyString(array[i]));
}
sb.append(']');
return sb.toString();
}
} else if (value instanceof Iterable) {
final Iterable iterable = (Iterable) value;
final StringBuilder sb = new StringBuilder();
sb.append('{');
int i = 0;
for (final Object o : iterable) {
if (i > 0) {
sb.append(',');
}
sb.append(toPrettyString(o));
i++;
}
sb.append('}');
return sb.toString();
}
return value.toString();
}
}