Method from org.apache.tomcat.util.IntrospectionUtils Detail: |
public static void addJarsFromClassPath(Vector jars,
String cp) throws IOException, MalformedURLException {
String sep = System.getProperty("path.separator");
String token;
StringTokenizer st;
if (cp != null) {
st = new StringTokenizer(cp, sep);
while (st.hasMoreTokens()) {
File f = new File(st.nextToken());
String path = f.getCanonicalPath();
if (f.isDirectory()) {
path += "/";
}
URL url = new URL("file", "", path);
if (!jars.contains(url)) {
jars.addElement(url);
}
}
}
}
Add elements from the classpath cp to a Vector jars as
file URLs (We use Vector for JDK 1.1 compat).
|
public static void addToClassPath(Vector cpV,
String dir) {
try {
String cpComp[] = getFilesByExt(dir, ".jar");
if (cpComp != null) {
int jarCount = cpComp.length;
for (int i = 0; i < jarCount; i++) {
URL url = getURL(dir, cpComp[i]);
if (url != null)
cpV.addElement(url);
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
Add all the jar files in a dir to the classpath, represented as a Vector
of URLs. |
public static void addToolsJar(Vector v) {
try {
// Add tools.jar in any case
File f = new File(System.getProperty("java.home")
+ "/../lib/tools.jar");
if (!f.exists()) {
// On some systems java.home gets set to the root of jdk.
// That's a bug, but we can work around and be nice.
f = new File(System.getProperty("java.home") + "/lib/tools.jar");
if (f.exists()) {
if (log.isDebugEnabled())
log.debug("Detected strange java.home value "
+ System.getProperty("java.home")
+ ", it should point to jre");
}
}
URL url = new URL("file", "", f.getAbsolutePath());
v.addElement(url);
} catch (MalformedURLException ex) {
ex.printStackTrace();
}
}
|
public static void callMain(Class c,
String[] args) throws Exception {
Class p[] = new Class[1];
p[0] = args.getClass();
Method m = c.getMethod("main", p);
m.invoke(c, new Object[] { args });
}
|
public static Object callMethod0(Object target,
String methodN) throws Exception {
if (target == null) {
d("Assert: Illegal params " + target);
return null;
}
if (dbg > 0)
d("callMethod0 " + target.getClass().getName() + "." + methodN);
Class params[] = new Class[0];
Method m = findMethod(target.getClass(), methodN, params);
if (m == null)
throw new NoSuchMethodException(target.getClass().getName() + " "
+ methodN);
return m.invoke(target, emptyArray);
}
|
public static Object callMethod1(Object target,
String methodN,
Object param1,
String typeParam1,
ClassLoader cl) throws Exception {
if (target == null || param1 == null) {
d("Assert: Illegal params " + target + " " + param1);
}
if (dbg > 0)
d("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);
return m.invoke(target, new Object[] { param1 });
}
|
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) {
d("Can't find method " + methodN + " in " + target + " CLASS "
+ target.getClass());
return null;
}
Object o = m.invoke(target, params);
if (dbg > 0) {
// debug
StringBuffer sb = new StringBuffer();
sb.append("" + target.getClass().getName() + "." + methodN + "( ");
for (int i = 0; i < params.length; i++) {
if (i > 0)
sb.append(", ");
sb.append(params[i]);
}
sb.append(")");
d(sb.toString());
}
return o;
}
|
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);
}
Reverse of Introspector.decapitalize |
public static String classPathAdd(URL[] urls,
String cp) {
if (urls == null)
return cp;
for (int i = 0; i < urls.length; i++) {
if (cp != null)
cp += PATH_SEPARATOR + urls[i].getFile();
else
cp = urls[i].getFile();
}
return cp;
}
Adds classpath entries from a vector of URL's to the "tc_path_add" System
property. This System property lists the classpath entries common to web
applications. This System property is currently used by Jasper when its
JSP servlet compiles the Java file for a JSP. |
public static void clear() {
objectMethods.clear();
}
|
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 = new Integer(object);
} catch (NumberFormatException ex) {
}
// Try a setFoo ( boolean )
} else if ("java.lang.Boolean".equals(paramType.getName())
|| "boolean".equals(paramType.getName())) {
result = new Boolean(object);
// Try a setFoo ( InetAddress )
} else if ("java.net.InetAddress".equals(paramType
.getName())) {
try {
result = InetAddress.getByName(object);
} catch (UnknownHostException exc) {
d("Unable to resolve host name:" + object);
}
// Unknown type
} else {
d("Unknown type " + paramType.getName());
}
if (result == null) {
throw new IllegalArgumentException("Can't convert argument: " + object);
}
return result;
}
|
static void d(String s) {
if (log.isDebugEnabled())
log.debug("IntrospectionUtils: " + s);
}
|
public static void displayClassPath(String msg,
URL[] cp) {
if (log.isDebugEnabled()) {
log.debug(msg);
for (int i = 0; i < cp.length; i++) {
log.debug(cp[i].getFile());
}
}
}
Debug method, display the classpath |
public static void execute(Object proxy,
String method) throws Exception {
Method executeM = null;
Class c = proxy.getClass();
Class params[] = new Class[0];
// params[0]=args.getClass();
executeM = findMethod(c, method, params);
if (executeM == null) {
throw new RuntimeException("No execute in " + proxy.getClass());
}
executeM.invoke(proxy, (Object[]) null);//new Object[] { args });
}
Call execute() - any ant-like task should work |
public static String[] findBooleanSetters(Class c) {
Method m[] = findMethods(c);
if (m == null)
return null;
Vector v = new Vector();
for (int i = 0; i < m.length; i++) {
if (m[i].getName().startsWith("set")
&& m[i].getParameterTypes().length == 1
&& "boolean".equalsIgnoreCase(m[i].getParameterTypes()[0]
.getName())) {
String arg = m[i].getName().substring(3);
v.addElement(unCapitalize(arg));
}
}
String s[] = new String[v.size()];
for (int i = 0; i < s.length; i++) {
s[i] = (String) v.elementAt(i);
}
return s;
}
|
public static Method findMethod(Class c,
String name,
Class[] params) {
Method methods[] = findMethods(c);
if (methods == null)
return null;
for (int i = 0; i < methods.length; i++) {
if (methods[i].getName().equals(name)) {
Class methodParams[] = methods[i].getParameterTypes();
if (methodParams == null)
if (params == null || params.length == 0)
return methods[i];
if (params == null)
if (methodParams == 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 Method[] findMethods(Class c) {
Method methods[] = (Method[]) objectMethods.get(c);
if (methods != null)
return methods;
methods = c.getMethods();
objectMethods.put(c, methods);
return methods;
}
|
public static String[] findVoidSetters(Class c) {
Method m[] = findMethods(c);
if (m == null)
return null;
Vector v = new Vector();
for (int i = 0; i < m.length; i++) {
if (m[i].getName().startsWith("set")
&& m[i].getParameterTypes().length == 0) {
String arg = m[i].getName().substring(3);
v.addElement(unCapitalize(arg));
}
}
String s[] = new String[v.size()];
for (int i = 0; i < s.length; i++) {
s[i] = (String) v.elementAt(i);
}
return s;
}
|
public static Object getAttribute(Object proxy,
String n) throws Exception {
Method executeM = null;
Class c = proxy.getClass();
Class params[] = new Class[1];
params[0] = String.class;
executeM = findMethod(c, "getAttribute", params);
if (executeM == null) {
if (log.isDebugEnabled())
log.debug("No getAttribute in " + proxy.getClass());
return null;
}
return executeM.invoke(proxy, new Object[] { n });
}
Call void getAttribute( String ) |
public static URL[] getClassPath(Vector v) {
URL[] urls = new URL[v.size()];
for (int i = 0; i < v.size(); i++) {
urls[i] = (URL) v.elementAt(i);
}
return urls;
}
Return a URL[] that can be used to construct a class loader |
public static URL[] getClassPath(String dir,
String cpath,
String cpathProp,
boolean addTools) throws IOException, MalformedURLException {
Vector jarsV = new Vector();
if (dir != null) {
// Add dir/classes first, if it exists
URL url = getURL(dir, "classes");
if (url != null)
jarsV.addElement(url);
addToClassPath(jarsV, dir);
}
if (cpath != null)
addJarsFromClassPath(jarsV, cpath);
if (cpathProp != null) {
String cpath1 = System.getProperty(cpathProp);
addJarsFromClassPath(jarsV, cpath1);
}
if (addTools)
addToolsJar(jarsV);
return getClassPath(jarsV);
}
Construct a URL classpath from files in a directory, a cpath property,
and tools.jar. |
public static String[] getFilesByExt(String ld,
String ext) {
File dir = new File(ld);
String[] names = null;
final String lext = ext;
if (dir.isDirectory()) {
names = dir.list(new FilenameFilter() {
public boolean accept(File d, String name) {
if (name.endsWith(lext)) {
return true;
}
return false;
}
});
}
return names;
}
Return all files with a given extension in a dir |
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 ex2) {
log.warn("IAE " + o + " " + name, ex2);
} catch (SecurityException ex1) {
if (dbg > 0)
d("SecurityException for " + o.getClass() + " " + name + ")");
if (dbg > 1)
ex1.printStackTrace();
} catch (IllegalAccessException iae) {
if (dbg > 0)
d("IllegalAccessException for " + o.getClass() + " " + name
+ ")");
if (dbg > 1)
iae.printStackTrace();
} catch (InvocationTargetException ie) {
if (dbg > 0)
d("InvocationTargetException for " + o.getClass() + " " + name
+ ")");
if (dbg > 1)
ie.printStackTrace();
}
return null;
}
|
public static URL getURL(String base,
String file) {
try {
File baseF = new File(base);
File f = new File(baseF, file);
String path = f.getCanonicalPath();
if (f.isDirectory()) {
path += "/";
}
if (!f.exists())
return null;
return new URL("file", "", path);
} catch (Exception ex) {
ex.printStackTrace();
return null;
}
}
Construct a file url from a file, using a base dir |
public static ClassLoader getURLClassLoader(URL[] urls,
ClassLoader parent) {
try {
Class urlCL = Class.forName("java.net.URLClassLoader");
Class paramT[] = new Class[2];
paramT[0] = urls.getClass();
paramT[1] = ClassLoader.class;
Method m = findMethod(urlCL, "newInstance", paramT);
if (m == null)
return null;
ClassLoader cl = (ClassLoader) m.invoke(urlCL, new Object[] { urls,
parent });
return cl;
} catch (ClassNotFoundException ex) {
// jdk1.1
return null;
} catch (Exception ex) {
ex.printStackTrace();
return null;
}
}
Construct a URLClassLoader. Will compile and work in JDK1.1 too. |
public static String guessInstall(String installSysProp,
String homeSysProp,
String jarName) {
return guessInstall(installSysProp, homeSysProp, jarName, null);
}
|
public static String guessInstall(String installSysProp,
String homeSysProp,
String jarName,
String classFile) {
String install = null;
String home = null;
if (installSysProp != null)
install = System.getProperty(installSysProp);
if (homeSysProp != null)
home = System.getProperty(homeSysProp);
if (install != null) {
if (home == null)
System.getProperties().put(homeSysProp, install);
return install;
}
// Find the directory where jarName.jar is located
String cpath = System.getProperty("java.class.path");
String pathSep = System.getProperty("path.separator");
StringTokenizer st = new StringTokenizer(cpath, pathSep);
while (st.hasMoreTokens()) {
String path = st.nextToken();
// log( "path " + path );
if (path.endsWith(jarName)) {
home = path.substring(0, path.length() - jarName.length());
try {
if ("".equals(home)) {
home = new File("./").getCanonicalPath();
} else if (home.endsWith(File.separator)) {
home = home.substring(0, home.length() - 1);
}
File f = new File(home);
String parentDir = f.getParent();
if (parentDir == null)
parentDir = home; // unix style
File f1 = new File(parentDir);
install = f1.getCanonicalPath();
if (installSysProp != null)
System.getProperties().put(installSysProp, install);
if (home == null && homeSysProp != null)
System.getProperties().put(homeSysProp, install);
return install;
} catch (Exception ex) {
ex.printStackTrace();
}
} else {
String fname = path + (path.endsWith("/") ? "" : "/")
+ classFile;
if (new File(fname).exists()) {
try {
File f = new File(path);
String parentDir = f.getParent();
if (parentDir == null)
parentDir = path; // unix style
File f1 = new File(parentDir);
install = f1.getCanonicalPath();
if (installSysProp != null)
System.getProperties().put(installSysProp, install);
if (home == null && homeSysProp != null)
System.getProperties().put(homeSysProp, install);
return install;
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
}
// if install directory can't be found, use home as the default
if (home != null) {
System.getProperties().put(installSysProp, home);
return home;
}
return null;
}
Guess a product install/home by analyzing the class path. It works for
product using the pattern: lib/executable.jar or if executable.jar is
included in classpath by a shell script. ( java -jar also works )
Insures both "install" and "home" System properties are set. If either or
both System properties are unset, "install" and "home" will be set to the
same value. This value will be the other System property that is set, or
the guessed value if neither is set. |
public static boolean hasHook(Object obj,
String methodN) {
try {
Method myMethods[] = findMethods(obj.getClass());
for (int i = 0; i < myMethods.length; i++) {
if (methodN.equals(myMethods[i].getName())) {
// check if it's overriden
Class declaring = myMethods[i].getDeclaringClass();
Class parentOfDeclaring = declaring.getSuperclass();
// this works only if the base class doesn't extend
// another class.
// if the method is declared in a top level class
// like BaseInterceptor parent is Object, otherwise
// parent is BaseInterceptor or an intermediate class
if (!"java.lang.Object".equals(parentOfDeclaring.getName())) {
return true;
}
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
return false;
}
Test if the object implements a particular
method |
public static boolean processArgs(Object proxy,
String[] args) throws Exception {
String args0[] = null;
if (null != findMethod(proxy.getClass(), "getOptions1", new Class[] {})) {
args0 = (String[]) callMethod0(proxy, "getOptions1");
}
if (args0 == null) {
//args0=findVoidSetters(proxy.getClass());
args0 = findBooleanSetters(proxy.getClass());
}
Hashtable h = null;
if (null != findMethod(proxy.getClass(), "getOptionAliases",
new Class[] {})) {
h = (Hashtable) callMethod0(proxy, "getOptionAliases");
}
return processArgs(proxy, args, args0, null, h);
}
|
public static boolean processArgs(Object proxy,
String[] args,
String[] args0,
String[] args1,
Hashtable aliases) throws Exception {
for (int i = 0; i < args.length; i++) {
String arg = args[i];
if (arg.startsWith("-"))
arg = arg.substring(1);
if (aliases != null && aliases.get(arg) != null)
arg = (String) aliases.get(arg);
if (args0 != null) {
boolean set = false;
for (int j = 0; j < args0.length; j++) {
if (args0[j].equalsIgnoreCase(arg)) {
setProperty(proxy, args0[j], "true");
set = true;
break;
}
}
if (set)
continue;
}
if (args1 != null) {
for (int j = 0; j < args1.length; j++) {
if (args1[j].equalsIgnoreCase(arg)) {
i++;
if (i >= args.length)
return false;
setProperty(proxy, arg, args[i]);
break;
}
}
} else {
// if args1 is not specified,assume all other options have param
i++;
if (i >= args.length)
return false;
setProperty(proxy, arg, args[i]);
}
}
return true;
}
|
public static String replaceProperties(String value,
Object getter) {
if (getter instanceof Hashtable)
return replaceProperties(value, (Hashtable) getter, null);
if (getter instanceof PropertySource) {
PropertySource src[] = new PropertySource[] { (PropertySource) getter };
return replaceProperties(value, null, src);
}
return value;
} Deprecated! Use - the explicit method
Replace ${NAME} with the property value |
public static String replaceProperties(String value,
Hashtable staticProp,
PropertySource[] dynamicProp) {
if (value.indexOf("$") < 0) {
return value;
}
StringBuffer sb = new StringBuffer();
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('$');
prev = pos + 1; // XXX
} else {
int endName = value.indexOf('}', pos);
if (endName < 0) {
sb.append(value.substring(pos));
prev = value.length();
continue;
}
String n = value.substring(pos + 2, endName);
String v = null;
if (staticProp != null) {
v = (String) ((Hashtable) staticProp).get(n);
}
if (v == null && dynamicProp != null) {
for (int i = 0; i < dynamicProp.length; i++) {
v = dynamicProp[i].getProperty(n);
if (v != null) {
break;
}
}
}
if (v == null)
v = "${" + n + "}";
sb.append(v);
prev = endName + 1;
}
}
if (prev < value.length())
sb.append(value.substring(prev));
return sb.toString();
}
Replace ${NAME} with the property value |
public static void setAttribute(Object proxy,
String n,
Object v) throws Exception {
if (proxy instanceof AttributeHolder) {
((AttributeHolder) proxy).setAttribute(n, v);
return;
}
Method executeM = null;
Class c = proxy.getClass();
Class params[] = new Class[2];
params[0] = String.class;
params[1] = Object.class;
executeM = findMethod(c, "setAttribute", params);
if (executeM == null) {
if (log.isDebugEnabled())
log.debug("No setAttribute in " + proxy.getClass());
return;
}
if (false)
if (log.isDebugEnabled())
log.debug("Setting " + n + "=" + v + " in " + proxy);
executeM.invoke(proxy, new Object[] { n, v });
return;
}
Call void setAttribute( String ,Object ) |
public static void setProperty(Object o,
String name) {
String setter = "set" + capitalize(name);
try {
Method methods[] = findMethods(o.getClass());
Method setPropertyMethod = null;
// find setFoo() method
for (int i = 0; i < methods.length; i++) {
Class paramT[] = methods[i].getParameterTypes();
if (setter.equals(methods[i].getName()) && paramT.length == 0) {
methods[i].invoke(o, new Object[] {});
return;
}
}
} catch (Exception ex1) {
if (dbg > 0)
d("Exception for " + o.getClass() + " " + name);
if (dbg > 1)
ex1.printStackTrace();
}
}
|
public static boolean setProperty(Object o,
String name,
String value) {
return setProperty(o,name,value,true);
}
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). |
public static boolean setProperty(Object o,
String name,
String value,
boolean invokeSetProperty) {
if (dbg > 1)
d("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] = new Integer(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] = new Long(value);
} catch (NumberFormatException ex) {
ok = false;
}
// Try a setFoo ( boolean )
} else if ("java.lang.Boolean".equals(paramType.getName())
|| "boolean".equals(paramType.getName())) {
params[0] = new Boolean(value);
// Try a setFoo ( InetAddress )
} else if ("java.net.InetAddress".equals(paramType
.getName())) {
try {
params[0] = InetAddress.getByName(value);
} catch (UnknownHostException exc) {
d("Unable to resolve host name:" + value);
ok = false;
}
// Unknown type
} else {
d("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);
}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 ex2) {
log.warn("IAE " + o + " " + name + " " + value, ex2);
} catch (SecurityException ex1) {
if (dbg > 0)
d("SecurityException for " + o.getClass() + " " + name + "="
+ value + ")");
if (dbg > 1)
ex1.printStackTrace();
} catch (IllegalAccessException iae) {
if (dbg > 0)
d("IllegalAccessException for " + o.getClass() + " " + name
+ "=" + value + ")");
if (dbg > 1)
iae.printStackTrace();
} catch (InvocationTargetException ie) {
if (dbg > 0)
d("InvocationTargetException for " + o.getClass() + " " + name
+ "=" + value + ")");
if (dbg > 1)
ie.printStackTrace();
}
return false;
}
|
public static String unCapitalize(String name) {
if (name == null || name.length() == 0) {
return name;
}
char chars[] = name.toCharArray();
chars[0] = Character.toLowerCase(chars[0]);
return new String(chars);
}
|