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A fork of MVEL by Axibase. Original version is hosted here: https://github.com/mvel/mvel.
MVEL is a powerful expression language for Java-based applications.
It provides a plethora of features and is suited for everything
from the smallest property binding and extraction, to full blown scripts.
/**
* MVEL 2.0
* Copyright (C) 2007 The Codehaus
* Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
*
* Licensed 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.mvel2.util;
import org.mvel2.ParserContext;
import org.mvel2.compiler.PropertyVerifier;
import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Map;
import static java.lang.String.valueOf;
import static java.lang.reflect.Modifier.PUBLIC;
import static java.lang.reflect.Modifier.STATIC;
import static java.lang.reflect.Modifier.isPublic;
import static org.mvel2.DataConversion.canConvert;
import static org.mvel2.util.ParseTools.boxPrimitive;
public class PropertyTools {
public static boolean isEmpty(Object o) {
if (o != null) {
if (o instanceof Object[]) {
return ((Object[]) o).length == 0 ||
(((Object[]) o).length == 1 && isEmpty(((Object[]) o)[0]));
}
else {
return ("".equals(valueOf(o)))
|| "null".equals(valueOf(o))
|| (o instanceof Collection && ((Collection) o).size() == 0)
|| (o instanceof Map && ((Map) o).size() == 0);
}
}
return true;
}
public static Method getSetter(Class clazz, String property) {
property = ReflectionUtil.getSetter(property);
for (Method meth : clazz.getMethods()) {
if ((meth.getModifiers() & PUBLIC) != 0 && meth.getParameterTypes().length == 1
&& property.equals(meth.getName())) {
return meth;
}
}
return null;
}
public static Method getSetter(Class clazz, String property, Class type) {
String simple = "set" + property;
property = ReflectionUtil.getSetter(property);
for (Method meth : clazz.getMethods()) {
if ((meth.getModifiers() & PUBLIC) != 0 && meth.getParameterTypes().length == 1 &&
(property.equals(meth.getName()) || simple.equals(meth.getName()))
&& (type == null || canConvert(meth.getParameterTypes()[0], type))) {
return meth;
}
}
return null;
}
public static boolean hasGetter(Field field) {
Method meth = getGetter(field.getDeclaringClass(), field.getName());
return meth != null && field.getType().isAssignableFrom(meth.getReturnType());
}
public static boolean hasSetter(Field field) {
Method meth = getSetter(field.getDeclaringClass(), field.getName());
return meth != null && meth.getParameterTypes().length == 1 &&
field.getType().isAssignableFrom(meth.getParameterTypes()[0]);
}
public static Method getGetter(Class clazz, String property) {
String simple = "get" + property;
String simpleIsGet = "is" + property;
String isGet = ReflectionUtil.getIsGetter(property);
String getter = ReflectionUtil.getGetter(property);
Method candidate = null;
if (Collection.class.isAssignableFrom(clazz) && "isEmpty".equals(isGet)) {
try {
return Collection.class.getMethod("isEmpty");
} catch (NoSuchMethodException ignore) {}
}
for (Method meth : clazz.getMethods()) {
if ((meth.getModifiers() & PUBLIC) != 0 && (meth.getModifiers() & STATIC) == 0 && meth.getParameterTypes().length == 0
&& (getter.equals(meth.getName()) || property.equals(meth.getName()) || ((isGet.equals(meth.getName()) || simpleIsGet.equals(meth.getName())) && meth.getReturnType() == boolean.class)
|| simple.equals(meth.getName()))) {
if (candidate == null || candidate.getReturnType().isAssignableFrom(meth.getReturnType())) {
candidate = meth;
}
}
}
return candidate;
}
public static Class getReturnType(Class clazz, String property, ParserContext ctx) {
return new PropertyVerifier(property, ctx, clazz).analyze();
}
public static Member getFieldOrAccessor(Class clazz, String property) {
for (Field f : clazz.getFields()) {
if (property.equals(f.getName())) {
if ((f.getModifiers() & PUBLIC) != 0) return f;
break;
}
}
return getGetter(clazz, property);
}
public static Member getFieldOrWriteAccessor(Class clazz, String property) {
Field field;
try {
if ((field = clazz.getField(property)) != null &&
isPublic(field.getModifiers())) {
return field;
}
}
catch (NullPointerException e) {
return null;
}
catch (NoSuchFieldException e) {
// do nothing.
}
return getSetter(clazz, property);
}
public static Member getFieldOrWriteAccessor(Class clazz, String property, Class type) {
for (Field f : clazz.getFields()) {
if (property.equals(f.getName()) && (type == null || canConvert(f.getType(), type))) {
return f;
}
}
return getSetter(clazz, property, type);
}
public static boolean contains(Object toCompare, Object testValue) {
if (toCompare == null)
return false;
else if (toCompare instanceof String)
return ((String) toCompare).contains(valueOf(testValue));
// return ((String) toCompare).indexOf(valueOf(testValue)) > -1;
else if (toCompare instanceof Collection)
return ((Collection) toCompare).contains(testValue);
else if (toCompare instanceof Map)
return ((Map) toCompare).containsKey(testValue);
else if (toCompare.getClass().isArray()) {
for (Object o : ((Object[]) toCompare)) {
if (testValue == null && o == null) return true;
else if (o != null && o.equals(testValue)) return true;
}
}
return false;
}
public static Object getPrimitiveInitialValue(Class type) {
if (type == int.class) {
return 0;
}
else if (type == boolean.class) {
return false;
}
else if (type == char.class) {
return (char) 0;
}
else if (type == double.class) {
return 0d;
}
else if (type == long.class) {
return 0l;
}
else if (type == float.class) {
return 0f;
}
else if (type == short.class) {
return (short) 0;
}
else if (type == byte.class) {
return (byte) 0;
}
else {
return 0;
}
}
public static boolean isAssignable(Class to, Class from) {
return (to.isPrimitive() ? boxPrimitive(to) : to).isAssignableFrom(from.isPrimitive() ? boxPrimitive(from) : from);
}
/**
* Get the JVM version
* @return first mvel.java.version, then java.version
* @see System.getProperty("mvel.java.version");
* @see System.getProperty("java.version");
*/
public static String getJavaVersion() {
return System.getProperty("mvel.java.version")!=null ?
System.getProperty("mvel.java.version") :
System.getProperty("java.version");
}
}