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RESOLVED - BATCH-988: MethodInvokingTaskletAdapter (via AbstractMethodInvokingDelegator) only allows specification of targetObject's declared methods

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use getMethods() instead of getDeclaredMethods for validating target method exists
allow null argument values
This commit is contained in:
robokaso
2009-01-07 10:36:36 +00:00
parent 6a7a0c7e32
commit e692072862
2 changed files with 75 additions and 47 deletions
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87
spring-batch-infrastructure/src/main/java/org/springframework/batch/item/adapter/AbstractMethodInvokingDelegator.java
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@@ -24,56 +24,59 @@ import org.springframework.util.Assert;
import org.springframework.util.MethodInvoker;
/**
* Superclass for delegating classes which dynamically call a
* custom method of injected object.
* Provides convenient API for dynamic method invocation shielding
* subclasses from low-level details and exception handling.
* Superclass for delegating classes which dynamically call a custom method of
* injected object. Provides convenient API for dynamic method invocation
* shielding subclasses from low-level details and exception handling.
*
* @author Robert Kasanicky
*/
public abstract class AbstractMethodInvokingDelegator<T> implements InitializingBean {
private Object targetObject;
private String targetMethod;
private Object[] arguments;
/**
* Invoker the target method with no arguments.
* Invoker the target method with arguments set by
* {@link #setArguments(Object[])}.
* @return object returned by invoked method
* @throws DynamicMethodInvocationException if the {@link MethodInvoker} used throws exception
* @throws DynamicMethodInvocationException if the {@link MethodInvoker}
* used throws exception
*/
protected T invokeDelegateMethod() {
MethodInvoker invoker = createMethodInvoker(targetObject, targetMethod);
invoker.setArguments(arguments);
return doInvoke(invoker);
}
/**
* Invokes the target method with given argument.
* @param object argument for the target method
* @return object returned by target method
* @throws DynamicMethodInvocationException if the {@link MethodInvoker} used throws exception
* @throws DynamicMethodInvocationException if the {@link MethodInvoker}
* used throws exception
*/
protected T invokeDelegateMethodWithArgument(Object object) {
MethodInvoker invoker = createMethodInvoker(targetObject, targetMethod);
invoker.setArguments(new Object[]{object});
invoker.setArguments(new Object[] { object });
return doInvoke(invoker);
}
/**
* Invokes the target method with given arguments.
* @param args arguments for the invoked method
* @return object returned by invoked method
* @throws DynamicMethodInvocationException if the {@link MethodInvoker} used throws exception
* @throws DynamicMethodInvocationException if the {@link MethodInvoker}
* used throws exception
*/
protected T invokeDelegateMethodWithArguments(Object[] args) {
MethodInvoker invoker = createMethodInvoker(targetObject, targetMethod);
invoker.setArguments(args);
return doInvoke(invoker);
}
/**
* Create a new configured instance of {@link MethodInvoker}.
*/
@@ -84,7 +87,7 @@ public abstract class AbstractMethodInvokingDelegator<T> implements Initializing
invoker.setArguments(arguments);
return invoker;
}
/**
* Prepare and invoke the invoker, rethrow checked exceptions as unchecked.
* @param invoker configured invoker
@@ -101,7 +104,7 @@ public abstract class AbstractMethodInvokingDelegator<T> implements Initializing
catch (NoSuchMethodException e) {
throw new DynamicMethodInvocationException(e);
}
try {
return (T) invoker.invoke();
}
@@ -110,64 +113,78 @@ public abstract class AbstractMethodInvokingDelegator<T> implements Initializing
}
catch (IllegalAccessException e) {
throw new DynamicMethodInvocationException(e);
}
}
}
public void afterPropertiesSet() throws Exception {
Assert.notNull(targetObject);
Assert.hasLength(targetMethod);
Assert.state(targetClassDeclaresTargetMethod(),
"target class must declare a method with name matching the target method");
Assert.state(targetClassDeclaresTargetMethod(),
"target class must declare a method with matching name and parameter types");
}
/**
* @return true if target class declares a method matching target method name
* with given number of arguments of appropriate type.
* @return true if target class declares a method matching target method
* name with given number of arguments of appropriate type.
*/
private boolean targetClassDeclaresTargetMethod() {
MethodInvoker invoker = createMethodInvoker(targetObject, targetMethod);
Method[] methods = invoker.getTargetClass().getDeclaredMethods();
Method[] methods = invoker.getTargetClass().getMethods();
String targetMethodName = invoker.getTargetMethod();
for (int i=0; i < methods.length; i++) {
for (int i = 0; i < methods.length; i++) {
if (methods[i].getName().equals(targetMethodName)) {
Class<?>[] params = methods[i].getParameterTypes();
if (arguments == null) {
// don't check signature, assume arguments will be supplied
// correctly at runtime
return true;
} else if (arguments.length == params.length) {
}
if (arguments.length == params.length) {
boolean argumentsMatchParameters = true;
for (int j = 0; j < params.length; j++) {
if (arguments[j] == null) {
continue;
}
if (!(params[j].isAssignableFrom(arguments[j].getClass()))) {
argumentsMatchParameters = false;
}
}
if (argumentsMatchParameters) return true;
if (argumentsMatchParameters)
return true;
}
}
}
return false;
}
/**
* @param targetObject the delegate - bean id can be used to set this value in Spring configuration
* @param targetObject the delegate - bean id can be used to set this value
* in Spring configuration
*/
public void setTargetObject(Object targetObject) {
this.targetObject = targetObject;
}
/**
* @param targetMethod name of the method to be invoked on {@link #setTargetObject(Object)}.
* @param targetMethod name of the method to be invoked on
* {@link #setTargetObject(Object)}.
*/
public void setTargetMethod(String targetMethod) {
this.targetMethod = targetMethod;
}
/**
* @param arguments arguments values for the {{@link #setTargetMethod(String)}.
* These are not expected to change during the lifetime of the delegator
* and will be used only when the subclass tries to invoke the target method
* without providing explicit argument values.
* @param arguments arguments values for the {
* {@link #setTargetMethod(String)}. These will be used only when the
* subclass tries to invoke the target method without providing explicit
* argument values.
*
* If arguments are set to not-null value {@link #afterPropertiesSet()} will
* check the values are compatible with target method's signature. In case
* arguments are null (not set) method signature will not be checked and it
* is assumed correct values will be supplied at runtime.
*/
public void setArguments(Object[] arguments) {
this.arguments = arguments;