org.apache.tomcat.util.IntrospectionUtils Maven / Gradle / Ivy
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.tomcat.util;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Hashtable;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.res.StringManager;
/**
* Utils for introspection and reflection
*/
public final class IntrospectionUtils {
private static final Log log = LogFactory.getLog(IntrospectionUtils.class);
private static final StringManager sm = StringManager.getManager(IntrospectionUtils.class);
/**
* Find a method with the right name If found, call the method ( if param is
* int or boolean we'll convert value to the right type before) - that means
* you can have setDebug(1).
* @param o The object to set a property on
* @param name The property name
* @param value The property value
* @return true if operation was successful
*/
public static boolean setProperty(Object o, String name, String value) {
return setProperty(o,name,value,true);
}
@SuppressWarnings("null") // setPropertyMethodVoid is not null when used
public static boolean setProperty(Object o, String name, String value,
boolean invokeSetProperty) {
if (log.isDebugEnabled())
log.debug("IntrospectionUtils: setProperty(" +
o.getClass() + " " + name + "=" + value + ")");
String setter = "set" + capitalize(name);
try {
Method methods[] = findMethods(o.getClass());
Method setPropertyMethodVoid = null;
Method setPropertyMethodBool = null;
// First, the ideal case - a setFoo( String ) method
for (int i = 0; i < methods.length; i++) {
Class paramT[] = methods[i].getParameterTypes();
if (setter.equals(methods[i].getName()) && paramT.length == 1
&& "java.lang.String".equals(paramT[0].getName())) {
methods[i].invoke(o, new Object[] { value });
return true;
}
}
// Try a setFoo ( int ) or ( boolean )
for (int i = 0; i < methods.length; i++) {
boolean ok = true;
if (setter.equals(methods[i].getName())
&& methods[i].getParameterTypes().length == 1) {
// match - find the type and invoke it
Class paramType = methods[i].getParameterTypes()[0];
Object params[] = new Object[1];
// Try a setFoo ( int )
if ("java.lang.Integer".equals(paramType.getName())
|| "int".equals(paramType.getName())) {
try {
params[0] = Integer.valueOf(value);
} catch (NumberFormatException ex) {
ok = false;
}
// Try a setFoo ( long )
}else if ("java.lang.Long".equals(paramType.getName())
|| "long".equals(paramType.getName())) {
try {
params[0] = Long.valueOf(value);
} catch (NumberFormatException ex) {
ok = false;
}
// Try a setFoo ( boolean )
} else if ("java.lang.Boolean".equals(paramType.getName())
|| "boolean".equals(paramType.getName())) {
params[0] = Boolean.valueOf(value);
// Try a setFoo ( InetAddress )
} else if ("java.net.InetAddress".equals(paramType
.getName())) {
try {
params[0] = InetAddress.getByName(value);
} catch (UnknownHostException exc) {
if (log.isDebugEnabled())
log.debug("IntrospectionUtils: Unable to resolve host name:" + value);
ok = false;
}
// Unknown type
} else {
if (log.isDebugEnabled())
log.debug("IntrospectionUtils: Unknown type " +
paramType.getName());
}
if (ok) {
methods[i].invoke(o, params);
return true;
}
}
// save "setProperty" for later
if ("setProperty".equals(methods[i].getName())) {
if (methods[i].getReturnType()==Boolean.TYPE){
setPropertyMethodBool = methods[i];
}else {
setPropertyMethodVoid = methods[i];
}
}
}
// Ok, no setXXX found, try a setProperty("name", "value")
if (invokeSetProperty && (setPropertyMethodBool != null ||
setPropertyMethodVoid != null)) {
Object params[] = new Object[2];
params[0] = name;
params[1] = value;
if (setPropertyMethodBool != null) {
try {
return ((Boolean) setPropertyMethodBool.invoke(o,
params)).booleanValue();
}catch (IllegalArgumentException biae) {
//the boolean method had the wrong
//parameter types. lets try the other
if (setPropertyMethodVoid!=null) {
setPropertyMethodVoid.invoke(o, params);
return true;
}else {
throw biae;
}
}
} else {
setPropertyMethodVoid.invoke(o, params);
return true;
}
}
} catch (IllegalArgumentException | SecurityException | IllegalAccessException e) {
log.warn(sm.getString("introspectionUtils.setPropertyError", name, value, o.getClass()), e);
} catch (InvocationTargetException e) {
ExceptionUtils.handleThrowable(e.getCause());
log.warn(sm.getString("introspectionUtils.setPropertyError", name, value, o.getClass()), e);
}
return false;
}
public static Object getProperty(Object o, String name) {
String getter = "get" + capitalize(name);
String isGetter = "is" + capitalize(name);
try {
Method methods[] = findMethods(o.getClass());
Method getPropertyMethod = null;
// First, the ideal case - a getFoo() method
for (int i = 0; i < methods.length; i++) {
Class paramT[] = methods[i].getParameterTypes();
if (getter.equals(methods[i].getName()) && paramT.length == 0) {
return methods[i].invoke(o, (Object[]) null);
}
if (isGetter.equals(methods[i].getName()) && paramT.length == 0) {
return methods[i].invoke(o, (Object[]) null);
}
if ("getProperty".equals(methods[i].getName())) {
getPropertyMethod = methods[i];
}
}
// Ok, no setXXX found, try a getProperty("name")
if (getPropertyMethod != null) {
Object params[] = new Object[1];
params[0] = name;
return getPropertyMethod.invoke(o, params);
}
} catch (IllegalArgumentException | SecurityException | IllegalAccessException e) {
log.warn(sm.getString("introspectionUtils.getPropertyError", name, o.getClass()), e);
} catch (InvocationTargetException e) {
if (e.getCause() instanceof NullPointerException) {
// Assume the underlying object uses a storage to represent an unset property
return null;
}
ExceptionUtils.handleThrowable(e.getCause());
log.warn(sm.getString("introspectionUtils.getPropertyError", name, o.getClass()), e);
}
return null;
}
/**
* Replace ${NAME} with the property value.
* @param value The value
* @param staticProp Replacement properties
* @param dynamicProp Replacement properties
* @return the replacement value
*/
public static String replaceProperties(String value,
Hashtable staticProp, PropertySource dynamicProp[]) {
if (value.indexOf('$') < 0) {
return value;
}
StringBuilder sb = new StringBuilder();
int prev = 0;
// assert value!=nil
int pos;
while ((pos = value.indexOf('$', prev)) >= 0) {
if (pos > 0) {
sb.append(value.substring(prev, pos));
}
if (pos == (value.length() - 1)) {
sb.append('$');
prev = pos + 1;
} else if (value.charAt(pos + 1) != '{') {
sb.append('$');
prev = pos + 1; // XXX
} else {
int endName = value.indexOf('}', pos);
if (endName < 0) {
sb.append(value.substring(pos));
prev = value.length();
continue;
}
String n = value.substring(pos + 2, endName);
String v = null;
if (staticProp != null) {
v = (String) staticProp.get(n);
}
if (v == null && dynamicProp != null) {
for (int i = 0; i < dynamicProp.length; i++) {
v = dynamicProp[i].getProperty(n);
if (v != null) {
break;
}
}
}
if (v == null)
v = "${" + n + "}";
sb.append(v);
prev = endName + 1;
}
}
if (prev < value.length())
sb.append(value.substring(prev));
return sb.toString();
}
/**
* Reverse of Introspector.decapitalize.
* @param name The name
* @return the capitalized string
*/
public static String capitalize(String name) {
if (name == null || name.length() == 0) {
return name;
}
char chars[] = name.toCharArray();
chars[0] = Character.toUpperCase(chars[0]);
return new String(chars);
}
// -------------------- other utils --------------------
public static void clear() {
objectMethods.clear();
}
private static final Hashtable,Method[]> objectMethods = new Hashtable<>();
public static Method[] findMethods(Class c) {
Method methods[] = objectMethods.get(c);
if (methods != null)
return methods;
methods = c.getMethods();
objectMethods.put(c, methods);
return methods;
}
@SuppressWarnings("null") // params cannot be null when comparing lengths
public static Method findMethod(Class c, String name,
Class params[]) {
Method methods[] = findMethods(c);
for (int i = 0; i < methods.length; i++) {
if (methods[i].getName().equals(name)) {
Class methodParams[] = methods[i].getParameterTypes();
if (params == null && methodParams.length == 0) {
return methods[i];
}
if (params.length != methodParams.length) {
continue;
}
boolean found = true;
for (int j = 0; j < params.length; j++) {
if (params[j] != methodParams[j]) {
found = false;
break;
}
}
if (found) {
return methods[i];
}
}
}
return null;
}
public static Object callMethod1(Object target, String methodN,
Object param1, String typeParam1, ClassLoader cl) throws Exception {
if (target == null || methodN == null || param1 == null) {
throw new IllegalArgumentException(sm.getString("introspectionUtils.nullParameter"));
}
if (log.isDebugEnabled())
log.debug("IntrospectionUtils: callMethod1 " +
target.getClass().getName() + " " +
param1.getClass().getName() + " " + typeParam1);
Class params[] = new Class[1];
if (typeParam1 == null)
params[0] = param1.getClass();
else
params[0] = cl.loadClass(typeParam1);
Method m = findMethod(target.getClass(), methodN, params);
if (m == null)
throw new NoSuchMethodException(target.getClass().getName() + " "
+ methodN);
try {
return m.invoke(target, new Object[] { param1 });
} catch (InvocationTargetException ie) {
ExceptionUtils.handleThrowable(ie.getCause());
throw ie;
}
}
public static Object callMethodN(Object target, String methodN,
Object params[], Class typeParams[]) throws Exception {
Method m = null;
m = findMethod(target.getClass(), methodN, typeParams);
if (m == null) {
if (log.isDebugEnabled())
log.debug("IntrospectionUtils: Can't find method " + methodN +
" in " + target + " CLASS " + target.getClass());
return null;
}
try {
Object o = m.invoke(target, params);
if (log.isDebugEnabled()) {
// debug
StringBuilder sb = new StringBuilder();
sb.append(target.getClass().getName()).append('.')
.append(methodN).append("( ");
for (int i = 0; i < params.length; i++) {
if (i > 0)
sb.append(", ");
sb.append(params[i]);
}
sb.append(")");
log.debug("IntrospectionUtils:" + sb.toString());
}
return o;
} catch (InvocationTargetException ie) {
ExceptionUtils.handleThrowable(ie.getCause());
throw ie;
}
}
public static Object convert(String object, Class paramType) {
Object result = null;
if ("java.lang.String".equals(paramType.getName())) {
result = object;
} else if ("java.lang.Integer".equals(paramType.getName())
|| "int".equals(paramType.getName())) {
try {
result = Integer.valueOf(object);
} catch (NumberFormatException ex) {
}
// Try a setFoo ( boolean )
} else if ("java.lang.Boolean".equals(paramType.getName())
|| "boolean".equals(paramType.getName())) {
result = Boolean.valueOf(object);
// Try a setFoo ( InetAddress )
} else if ("java.net.InetAddress".equals(paramType
.getName())) {
try {
result = InetAddress.getByName(object);
} catch (UnknownHostException exc) {
if (log.isDebugEnabled())
log.debug("IntrospectionUtils: Unable to resolve host name:" +
object);
}
// Unknown type
} else {
if (log.isDebugEnabled())
log.debug("IntrospectionUtils: Unknown type " +
paramType.getName());
}
if (result == null) {
throw new IllegalArgumentException(sm.getString("introspectionUtils.conversionError", object, paramType.getName()));
}
return result;
}
// -------------------- Get property --------------------
// This provides a layer of abstraction
public static interface PropertySource {
public String getProperty(String key);
}
}
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