Author: markt
Date: Tue Sep 17 11:33:26 2013
New Revision: 1523988
URL: http://svn.apache.org/r1523988
Log:
Use java.beans.Expression to simplify method and constructor
matching/execution. Approach suggested by Esmond Pitt.
Modified:
tomcat/trunk/java/javax/el/BeanELResolver.java
tomcat/trunk/java/javax/el/StaticFieldELResolver.java
tomcat/trunk/java/javax/el/Util.java
Modified: tomcat/trunk/java/javax/el/BeanELResolver.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/javax/el/BeanELResolver.java?rev=1523988&r1=1523987&r2=1523988&view=diff
==============================================================================
--- tomcat/trunk/java/javax/el/BeanELResolver.java (original)
+++ tomcat/trunk/java/javax/el/BeanELResolver.java Tue Sep 17 11:33:26 2013
@@ -166,16 +166,16 @@ public class BeanELResolver extends ELRe
String methodName = (String) factory.coerceToType(method,
String.class);
- // Find the matching method
- Method matchingMethod =
- Util.findMethod(base.getClass(), methodName, paramTypes,
params);
-
- Object[] parameters = Util.buildParameters(
- matchingMethod.getParameterTypes(), matchingMethod.isVarArgs(),
- params);
+ java.beans.Expression beanExpression =
+ new java.beans.Expression(base, methodName, params);
- Object result = null;
+ Object result;
try {
+ result = beanExpression.getValue();
+ } catch (Exception e) {
+ throw new ELException(e);
+ }
+/* try {
result = matchingMethod.invoke(base, parameters);
} catch (IllegalArgumentException | IllegalAccessException e) {
throw new ELException(e);
@@ -184,7 +184,7 @@ public class BeanELResolver extends ELRe
Util.handleThrowable(cause);
throw new ELException(cause);
}
-
+*/
context.setPropertyResolved(base, method);
return result;
}
Modified: tomcat/trunk/java/javax/el/StaticFieldELResolver.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/javax/el/StaticFieldELResolver.java?rev=1523988&r1=1523987&r2=1523988&view=diff
==============================================================================
--- tomcat/trunk/java/javax/el/StaticFieldELResolver.java (original)
+++ tomcat/trunk/java/javax/el/StaticFieldELResolver.java Tue Sep 17 11:33:26
2013
@@ -17,10 +17,7 @@
package javax.el;
import java.beans.FeatureDescriptor;
-import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Iterator;
@@ -92,61 +89,29 @@ public class StaticFieldELResolver exten
throw new NullPointerException();
}
+ Object result = null;
+
if (base instanceof ELClass && method instanceof String) {
context.setPropertyResolved(base, method);
- Class<?> clazz = ((ELClass) base).getKlass();
String methodName = (String) method;
-
if ("<init>".equals(methodName)) {
- Constructor<?> match =
- Util.findConstructor(clazz, paramTypes, params);
-
- Object[] parameters = Util.buildParameters(
- match.getParameterTypes(), match.isVarArgs(), params);
-
- Object result = null;
-
- try {
- result = match.newInstance(parameters);
- } catch (IllegalArgumentException | IllegalAccessException |
- InstantiationException e) {
- throw new ELException(e);
- } catch (InvocationTargetException e) {
- Throwable cause = e.getCause();
- Util.handleThrowable(cause);
- throw new ELException(cause);
- }
- return result;
-
- } else {
- Method match =
- Util.findMethod(clazz, methodName, paramTypes, params);
-
- int modifiers = match.getModifiers();
- if (!Modifier.isStatic(modifiers)) {
- throw new MethodNotFoundException(Util.message(context,
- "staticFieldELResolver.methodNotFound", methodName,
- clazz.getName()));
- }
+ // java.beans.Expression uses 'new' for constructors
+ methodName = "new";
+ }
+ Class<?> clazz = ((ELClass) base).getKlass();
- Object[] parameters = Util.buildParameters(
- match.getParameterTypes(), match.isVarArgs(), params);
+ java.beans.Expression beanExpression =
+ new java.beans.Expression(clazz, methodName, params);
- Object result = null;
- try {
- result = match.invoke(null, parameters);
- } catch (IllegalArgumentException | IllegalAccessException e) {
- throw new ELException(e);
- } catch (InvocationTargetException e) {
- Throwable cause = e.getCause();
- Util.handleThrowable(cause);
- throw new ELException(cause);
- }
- return result;
+ try {
+ result = beanExpression.getValue();
+ } catch (Exception e) {
+ throw new ELException(e);
}
}
- return null;
+
+ return result;
}
@Override
Modified: tomcat/trunk/java/javax/el/Util.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/javax/el/Util.java?rev=1523988&r1=1523987&r2=1523988&view=diff
==============================================================================
--- tomcat/trunk/java/javax/el/Util.java (original)
+++ tomcat/trunk/java/javax/el/Util.java Tue Sep 17 11:33:26 2013
@@ -17,19 +17,12 @@
package javax.el;
import java.lang.ref.WeakReference;
-import java.lang.reflect.Array;
-import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.text.MessageFormat;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
import java.util.Locale;
-import java.util.Map;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
-import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.locks.Lock;
@@ -194,321 +187,6 @@ class Util {
* This method duplicates code in org.apache.el.util.ReflectionUtil. When
* making changes keep the code in sync.
*/
- static Method findMethod(Class<?> clazz, String methodName,
- Class<?>[] paramTypes, Object[] paramValues) {
-
- if (clazz == null || methodName == null) {
- throw new MethodNotFoundException(
- message(null, "util.method.notfound", clazz, methodName,
- paramString(paramTypes)));
- }
-
- if (paramTypes == null) {
- paramTypes = getTypesFromValues(paramValues);
- }
-
- Method[] methods = clazz.getMethods();
-
- List<Wrapper> wrappers = Wrapper.wrap(methods, methodName);
-
- Wrapper result = findWrapper(
- clazz, wrappers, methodName, paramTypes, paramValues);
-
- if (result == null) {
- return null;
- }
- return getMethod(clazz, (Method) result.unWrap());
- }
-
- /*
- * This method duplicates code in org.apache.el.util.ReflectionUtil. When
- * making changes keep the code in sync.
- */
- @SuppressWarnings("null")
- private static Wrapper findWrapper(Class<?> clazz, List<Wrapper> wrappers,
- String name, Class<?>[] paramTypes, Object[] paramValues) {
-
- Map<Wrapper,Integer> candidates = new HashMap<>();
-
- int paramCount;
- if (paramTypes == null) {
- paramCount = 0;
- } else {
- paramCount = paramTypes.length;
- }
-
- for (Wrapper w : wrappers) {
- Class<?>[] mParamTypes = w.getParameterTypes();
- int mParamCount;
- if (mParamTypes == null) {
- mParamCount = 0;
- } else {
- mParamCount = mParamTypes.length;
- }
-
- // Check the number of parameters
- if (!(paramCount == mParamCount ||
- (w.isVarArgs() && paramCount >= mParamCount))) {
- // Method has wrong number of parameters
- continue;
- }
-
- // Check the parameters match
- int exactMatch = 0;
- boolean noMatch = false;
- for (int i = 0; i < mParamCount; i++) {
- // Can't be null
- if (mParamTypes[i].equals(paramTypes[i])) {
- exactMatch++;
- } else if (i == (mParamCount - 1) && w.isVarArgs()) {
- Class<?> varType = mParamTypes[i].getComponentType();
- for (int j = i; j < paramCount; j++) {
- if (!isAssignableFrom(paramTypes[j], varType)) {
- if (paramValues == null) {
- noMatch = true;
- break;
- } else {
- if (!isCoercibleFrom(paramValues[j], varType))
{
- noMatch = true;
- break;
- }
- }
- }
- // Don't treat a varArgs match as an exact match, it
can
- // lead to a varArgs method matching when the result
- // should be ambiguous
- }
- } else if (!isAssignableFrom(paramTypes[i], mParamTypes[i])) {
- if (paramValues == null) {
- noMatch = true;
- break;
- } else {
- if (!isCoercibleFrom(paramValues[i], mParamTypes[i])) {
- noMatch = true;
- break;
- }
- }
- }
- }
- if (noMatch) {
- continue;
- }
-
- // If a method is found where every parameter matches exactly,
- // return it
- if (exactMatch == paramCount) {
- return w;
- }
-
- candidates.put(w, Integer.valueOf(exactMatch));
- }
-
- // Look for the method that has the highest number of parameters where
- // the type matches exactly
- int bestMatch = 0;
- Wrapper match = null;
- boolean multiple = false;
- for (Map.Entry<Wrapper, Integer> entry : candidates.entrySet()) {
- if (entry.getValue().intValue() > bestMatch ||
- match == null) {
- bestMatch = entry.getValue().intValue();
- match = entry.getKey();
- multiple = false;
- } else if (entry.getValue().intValue() == bestMatch) {
- multiple = true;
- }
- }
- if (multiple) {
- if (bestMatch == paramCount - 1) {
- // Only one parameter is not an exact match - try using the
- // super class
- match = resolveAmbiguousWrapper(candidates.keySet(),
paramTypes);
- } else {
- match = null;
- }
-
- if (match == null) {
- // If multiple methods have the same matching number of
parameters
- // the match is ambiguous so throw an exception
- throw new MethodNotFoundException(message(
- null, "util.method.ambiguous", clazz, name,
- paramString(paramTypes)));
- }
- }
-
- // Handle case where no match at all was found
- if (match == null) {
- throw new MethodNotFoundException(message(
- null, "util.method.notfound", clazz, name,
- paramString(paramTypes)));
- }
-
- return match;
- }
-
-
- private static final String paramString(Class<?>[] types) {
- if (types != null) {
- StringBuilder sb = new StringBuilder();
- for (int i = 0; i < types.length; i++) {
- if (types[i] == null) {
- sb.append("null, ");
- } else {
- sb.append(types[i].getName()).append(", ");
- }
- }
- if (sb.length() > 2) {
- sb.setLength(sb.length() - 2);
- }
- return sb.toString();
- }
- return null;
- }
-
-
- /*
- * This method duplicates code in org.apache.el.util.ReflectionUtil. When
- * making changes keep the code in sync.
- */
- private static Wrapper resolveAmbiguousWrapper(Set<Wrapper> candidates,
- Class<?>[] paramTypes) {
- // Identify which parameter isn't an exact match
- Wrapper w = candidates.iterator().next();
-
- int nonMatchIndex = 0;
- Class<?> nonMatchClass = null;
-
- for (int i = 0; i < paramTypes.length; i++) {
- if (w.getParameterTypes()[i] != paramTypes[i]) {
- nonMatchIndex = i;
- nonMatchClass = paramTypes[i];
- break;
- }
- }
-
- if (nonMatchClass == null) {
- // Null will always be ambiguous
- return null;
- }
-
- for (Wrapper c : candidates) {
- if (c.getParameterTypes()[nonMatchIndex] ==
- paramTypes[nonMatchIndex]) {
- // Methods have different non-matching parameters
- // Result is ambiguous
- return null;
- }
- }
-
- // Can't be null
- Class<?> superClass = nonMatchClass.getSuperclass();
- while (superClass != null) {
- for (Wrapper c : candidates) {
- if (c.getParameterTypes()[nonMatchIndex].equals(superClass)) {
- // Found a match
- return c;
- }
- }
- superClass = superClass.getSuperclass();
- }
-
- // Treat instances of Number as a special case
- Wrapper match = null;
- if (Number.class.isAssignableFrom(nonMatchClass)) {
- for (Wrapper c : candidates) {
- Class<?> candidateType = c.getParameterTypes()[nonMatchIndex];
- if (Number.class.isAssignableFrom(candidateType) ||
- candidateType.isPrimitive()) {
- if (match == null) {
- match = c;
- } else {
- // Match still ambiguous
- match = null;
- break;
- }
- }
- }
- }
-
- return match;
- }
-
-
- /*
- * This method duplicates code in org.apache.el.util.ReflectionUtil. When
- * making changes keep the code in sync.
- */
- private static boolean isAssignableFrom(Class<?> src, Class<?> target) {
- // src will always be an object
- // Short-cut. null is always assignable to an object and in EL null
- // can always be coerced to a valid value for a primitive
- if (src == null) {
- return true;
- }
-
- Class<?> targetClass;
- if (target.isPrimitive()) {
- if (target == Boolean.TYPE) {
- targetClass = Boolean.class;
- } else if (target == Character.TYPE) {
- targetClass = Character.class;
- } else if (target == Byte.TYPE) {
- targetClass = Byte.class;
- } else if (target == Short.TYPE) {
- targetClass = Short.class;
- } else if (target == Integer.TYPE) {
- targetClass = Integer.class;
- } else if (target == Long.TYPE) {
- targetClass = Long.class;
- } else if (target == Float.TYPE) {
- targetClass = Float.class;
- } else {
- targetClass = Double.class;
- }
- } else {
- targetClass = target;
- }
- return targetClass.isAssignableFrom(src);
- }
-
-
- /*
- * This method duplicates code in org.apache.el.util.ReflectionUtil. When
- * making changes keep the code in sync.
- */
- private static boolean isCoercibleFrom(Object src, Class<?> target) {
- // TODO: This isn't pretty but it works. Significant refactoring would
- // be required to avoid the exception.
- try {
- getExpressionFactory().coerceToType(src, target);
- } catch (ELException e) {
- return false;
- }
- return true;
- }
-
-
- private static Class<?>[] getTypesFromValues(Object[] values) {
- if (values == null) {
- return null;
- }
-
- Class<?> result[] = new Class<?>[values.length];
- for (int i = 0; i < values.length; i++) {
- if (values[i] == null) {
- result[i] = null;
- } else {
- result[i] = values[i].getClass();
- }
- }
- return result;
- }
-
-
- /*
- * This method duplicates code in org.apache.el.util.ReflectionUtil. When
- * making changes keep the code in sync.
- */
static Method getMethod(Class<?> type, Method m) {
if (m == null || Modifier.isPublic(type.getModifiers())) {
return m;
@@ -540,164 +218,4 @@ class Util {
}
return null;
}
-
-
- static Constructor<?> findConstructor(Class<?> clazz, Class<?>[]
paramTypes,
- Object[] paramValues) {
-
- String methodName = "<init>";
-
- if (clazz == null) {
- throw new MethodNotFoundException(
- message(null, "util.method.notfound", clazz, methodName,
- paramString(paramTypes)));
- }
-
- if (paramTypes == null) {
- paramTypes = getTypesFromValues(paramValues);
- }
-
- Constructor<?>[] constructors = clazz.getConstructors();
-
- List<Wrapper> wrappers = Wrapper.wrap(constructors);
-
- Wrapper result = findWrapper(
- clazz, wrappers, methodName, paramTypes, paramValues);
-
- if (result == null) {
- return null;
- }
- return getConstructor(clazz, (Constructor<?>) result.unWrap());
- }
-
-
- static Constructor<?> getConstructor(Class<?> type, Constructor<?> c) {
- if (c == null || Modifier.isPublic(type.getModifiers())) {
- return c;
- }
- Constructor<?> cp = null;
- Class<?> sup = type.getSuperclass();
- if (sup != null) {
- try {
- cp = sup.getConstructor(c.getParameterTypes());
- cp = getConstructor(cp.getDeclaringClass(), cp);
- if (cp != null) {
- return cp;
- }
- } catch (NoSuchMethodException e) {
- // Ignore
- }
- }
- return null;
- }
-
-
- static Object[] buildParameters(Class<?>[] parameterTypes,
- boolean isVarArgs,Object[] params) {
- ExpressionFactory factory = getExpressionFactory();
- Object[] parameters = null;
- if (parameterTypes.length > 0) {
- parameters = new Object[parameterTypes.length];
- int paramCount = params.length;
- if (isVarArgs) {
- int varArgIndex = parameterTypes.length - 1;
- // First argCount-1 parameters are standard
- for (int i = 0; (i < varArgIndex); i++) {
- parameters[i] = factory.coerceToType(params[i],
- parameterTypes[i]);
- }
- // Last parameter is the varargs
- Class<?> varArgClass =
- parameterTypes[varArgIndex].getComponentType();
- final Object varargs = Array.newInstance(
- varArgClass,
- (paramCount - varArgIndex));
- for (int i = (varArgIndex); i < paramCount; i++) {
- Array.set(varargs, i - varArgIndex,
- factory.coerceToType(params[i], varArgClass));
- }
- parameters[varArgIndex] = varargs;
- } else {
- parameters = new Object[parameterTypes.length];
- for (int i = 0; i < parameterTypes.length; i++) {
- parameters[i] = factory.coerceToType(params[i],
- parameterTypes[i]);
- }
- }
- }
- return parameters;
- }
-
-
- private abstract static class Wrapper {
-
- public static List<Wrapper> wrap(Method[] methods, String name) {
- List<Wrapper> result = new ArrayList<>();
- for (Method method : methods) {
- if (method.getName().equals(name)) {
- result.add(new MethodWrapper(method));
- }
- }
- return result;
- }
-
- public static List<Wrapper> wrap(Constructor<?>[] constructors) {
- List<Wrapper> result = new ArrayList<>();
- for (Constructor<?> constructor : constructors) {
- result.add(new ConstructorWrapper(constructor));
- }
- return result;
- }
-
- public abstract Object unWrap();
- public abstract Class<?>[] getParameterTypes();
- public abstract boolean isVarArgs();
- }
-
-
- private static class MethodWrapper extends Wrapper {
- private final Method m;
-
- public MethodWrapper(Method m) {
- this.m = m;
- }
-
- @Override
- public Object unWrap() {
- return m;
- }
-
- @Override
- public Class<?>[] getParameterTypes() {
- return m.getParameterTypes();
- }
-
- @Override
- public boolean isVarArgs() {
- return m.isVarArgs();
- }
- }
-
- private static class ConstructorWrapper extends Wrapper {
- private final Constructor<?> c;
-
- public ConstructorWrapper(Constructor<?> c) {
- this.c = c;
- }
-
- @Override
- public Object unWrap() {
- return c;
- }
-
- @Override
- public Class<?>[] getParameterTypes() {
- return c.getParameterTypes();
- }
-
- @Override
- public boolean isVarArgs() {
- return c.isVarArgs();
- }
- }
}
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