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//
// ========================================================================
// Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.util;
import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Arrays;
import java.util.List;
/**
* IntrospectionUtil
*
*
*/
public class IntrospectionUtil
{
public static boolean isJavaBeanCompliantSetter (Method method)
{
if (method == null)
return false;
if (method.getReturnType() != Void.TYPE)
return false;
if (!method.getName().startsWith("set"))
return false;
if (method.getParameterTypes().length != 1)
return false;
return true;
}
public static Method findMethod (Class<?> clazz, String methodName, Class<?>[] args, boolean checkInheritance, boolean strictArgs)
throws NoSuchMethodException
{
if (clazz == null)
throw new NoSuchMethodException("No class");
if (methodName==null || methodName.trim().equals(""))
throw new NoSuchMethodException("No method name");
Method method = null;
Method[] methods = clazz.getDeclaredMethods();
for (int i=0;i<methods.length && method==null;i++)
{
if (methods[i].getName().equals(methodName) && checkParams(methods[i].getParameterTypes(), (args==null?new Class[] {}:args), strictArgs))
{
method = methods[i];
}
}
if (method!=null)
{
return method;
}
else if (checkInheritance)
return findInheritedMethod(clazz.getPackage(), clazz.getSuperclass(), methodName, args, strictArgs);
else
throw new NoSuchMethodException("No such method "+methodName+" on class "+clazz.getName());
}
public static Field findField (Class<?> clazz, String targetName, Class<?> targetType, boolean checkInheritance, boolean strictType)
throws NoSuchFieldException
{
if (clazz == null)
throw new NoSuchFieldException("No class");
if (targetName==null)
throw new NoSuchFieldException("No field name");
try
{
Field field = clazz.getDeclaredField(targetName);
if (strictType)
{
if (field.getType().equals(targetType))
return field;
}
else
{
if (field.getType().isAssignableFrom(targetType))
return field;
}
if (checkInheritance)
{
return findInheritedField(clazz.getPackage(), clazz.getSuperclass(), targetName, targetType, strictType);
}
else
throw new NoSuchFieldException("No field with name "+targetName+" in class "+clazz.getName()+" of type "+targetType);
}
catch (NoSuchFieldException e)
{
return findInheritedField(clazz.getPackage(),clazz.getSuperclass(), targetName,targetType,strictType);
}
}
public static boolean isInheritable (Package pack, Member member)
{
if (pack==null)
return false;
if (member==null)
return false;
int modifiers = member.getModifiers();
if (Modifier.isPublic(modifiers))
return true;
if (Modifier.isProtected(modifiers))
return true;
if (!Modifier.isPrivate(modifiers) && pack.equals(member.getDeclaringClass().getPackage()))
return true;
return false;
}
public static boolean checkParams (Class<?>[] formalParams, Class<?>[] actualParams, boolean strict)
{
if (formalParams==null)
return actualParams==null;
if (actualParams==null)
return false;
if (formalParams.length!=actualParams.length)
return false;
if (formalParams.length==0)
return true;
int j=0;
if (strict)
{
while (j<formalParams.length && formalParams[j].equals(actualParams[j]))
j++;
}
else
{
while ((j<formalParams.length) && (formalParams[j].isAssignableFrom(actualParams[j])))
{
j++;
}
}
if (j!=formalParams.length)
{
return false;
}
return true;
}
public static boolean isSameSignature (Method methodA, Method methodB)
{
if (methodA==null)
return false;
if (methodB==null)
return false;
List<Class<?>> parameterTypesA = Arrays.asList(methodA.getParameterTypes());
List<Class<?>> parameterTypesB = Arrays.asList(methodB.getParameterTypes());
if (methodA.getName().equals(methodB.getName())
&&
parameterTypesA.containsAll(parameterTypesB))
return true;
return false;
}
public static boolean isTypeCompatible (Class<?> formalType, Class<?> actualType, boolean strict)
{
if (formalType==null)
return actualType==null;
if (actualType==null)
return false;
if (strict)
return formalType.equals(actualType);
else
return formalType.isAssignableFrom(actualType);
}
public static boolean containsSameMethodSignature (Method method, Class<?> c, boolean checkPackage)
{
if (checkPackage)
{
if (!c.getPackage().equals(method.getDeclaringClass().getPackage()))
return false;
}
boolean samesig = false;
Method[] methods = c.getDeclaredMethods();
for (int i=0; i<methods.length && !samesig; i++)
{
if (IntrospectionUtil.isSameSignature(method, methods[i]))
samesig = true;
}
return samesig;
}
public static boolean containsSameFieldName(Field field, Class<?> c, boolean checkPackage)
{
if (checkPackage)
{
if (!c.getPackage().equals(field.getDeclaringClass().getPackage()))
return false;
}
boolean sameName = false;
Field[] fields = c.getDeclaredFields();
for (int i=0;i<fields.length && !sameName; i++)
{
if (fields[i].getName().equals(field.getName()))
sameName = true;
}
return sameName;
}
protected static Method findInheritedMethod (Package pack, Class<?> clazz, String methodName, Class<?>[] args, boolean strictArgs)
throws NoSuchMethodException
{
if (clazz==null)
throw new NoSuchMethodException("No class");
if (methodName==null)
throw new NoSuchMethodException("No method name");
Method method = null;
Method[] methods = clazz.getDeclaredMethods();
for (int i=0;i<methods.length && method==null;i++)
{
if (methods[i].getName().equals(methodName)
&& isInheritable(pack,methods[i])
&& checkParams(methods[i].getParameterTypes(), args, strictArgs))
method = methods[i];
}
if (method!=null)
{
return method;
}
else
return findInheritedMethod(clazz.getPackage(), clazz.getSuperclass(), methodName, args, strictArgs);
}
protected static Field findInheritedField (Package pack, Class<?> clazz, String fieldName, Class<?> fieldType, boolean strictType)
throws NoSuchFieldException
{
if (clazz==null)
throw new NoSuchFieldException ("No class");
if (fieldName==null)
throw new NoSuchFieldException ("No field name");
try
{
Field field = clazz.getDeclaredField(fieldName);
if (isInheritable(pack, field) && isTypeCompatible(fieldType, field.getType(), strictType))
return field;
else
return findInheritedField(clazz.getPackage(), clazz.getSuperclass(),fieldName, fieldType, strictType);
}
catch (NoSuchFieldException e)
{
return findInheritedField(clazz.getPackage(), clazz.getSuperclass(),fieldName, fieldType, strictType);
}
}
}
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