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15 changed files with 1214 additions and 1172 deletions

2
.gitignore vendored
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@ -1,2 +1,4 @@
target/*
.pmd
.scala_dependencies
.settings/

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@ -3,6 +3,18 @@ SpelHelper provides additional functionalities to work with
SpelHelper is available under GNU Lesser General Public License (GNU LGPL).
**Maven Usage**
To use SpelHelper with Maven, add the following snippet in the dependencies section of your project's POM file:
<dependency>
<groupId>net.abhinavsarkar</groupId>
<artifactId>SpelHelper</artifactId>
<version>1.1</version>
</dependency>
**Functionalities**
The addition functionalities provided are:
1. Implicit methods
@ -10,7 +22,7 @@ The addition functionalities provided are:
3. Simplified extension functions
4. Simplified constructors
**Implicit Methods**
_**Implicit methods**_
Implicit methods allow one to registers methods with SpelHelper and attach
them to particular classes. After that, when that method is called on an
@ -27,7 +39,7 @@ So when an expression like `"#list(1,4,2).sorted()"` is evaluated, the
first parameter and its return value is used in further evaluation of the
expression.
**Implicit Properties**
_**Implicit properties**_
Implicit properties allow one to treat no argument methods of an object
as properties of the object. SpelHelper intercepts the property resolution
@ -42,7 +54,7 @@ the same value as the last example.
Implicit property resolution considers both the actual methods of the object
and the implicit methods registered on the object's class.
**Simplified extension functions**
_**Simplified extension functions**_
SpEL [allows][2] to register extension function on the context by providing a
name and a java.lang.reflect.Method object. SpelHelper simplifies this by taking a class
@ -54,7 +66,7 @@ registered by SpelHelper. Hence the method [ExtensionFunctions#list(Object...)][
can be called from inside a SpEL expression using the function call syntax:
`"#list(1,2,3)`".
**Simplified constructors**
_**Simplified constructors**_
SpEL [allows][3] calling constructors from inside a SpEL expression using the
`new` operator. But they have to be called with their full name like:

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@ -3,7 +3,7 @@
<groupId>net.abhinavsarkar</groupId>
<artifactId>SpelHelper</artifactId>
<version>1.0</version>
<version>1.3-SNAPSHOT</version>
<packaging>jar</packaging>
<name>SpelHelper</name>
@ -19,6 +19,7 @@
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<scala.version>2.7.7</scala.version>
<spring.version>3.0.6.RELEASE</spring.version>
</properties>
<issueManagement>
@ -189,6 +190,7 @@
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>${scala.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.scalatest</groupId>
@ -205,12 +207,12 @@
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>3.0.2.RELEASE</version>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>3.0.2.RELEASE</version>
<version>${spring.version}</version>
</dependency>
</dependencies>

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@ -18,26 +18,29 @@
package net.abhinavsarkar.spelhelper;
import java.lang.reflect.Constructor;
import java.util.Arrays;
import java.util.List;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.expression.AccessException;
import org.springframework.expression.ConstructorExecutor;
import org.springframework.expression.ConstructorResolver;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.spel.support.ReflectiveConstructorResolver;
final class ImplicitConstructorResolver implements
ConstructorResolver {
final class ImplicitConstructorResolver implements ConstructorResolver {
private final ReflectiveConstructorResolver delegate = new ReflectiveConstructorResolver();
public ConstructorExecutor resolve(final EvaluationContext context,
final String typeName, final Class<?>[] argumentTypes) throws AccessException {
@Override
public ConstructorExecutor resolve(
final EvaluationContext context, final String typeName,
final List<TypeDescriptor> argumentTypes)
throws AccessException {
try {
return delegate.resolve(context, typeName, argumentTypes);
} catch (AccessException ex) {
Object variable = ((SpelHelper) context.lookupVariable(SpelHelper.CONTEXT_LOOKUP_KEY))
.lookupImplicitConstructor(typeName + Arrays.toString(argumentTypes));
.lookupImplicitConstructor(typeName + argumentTypes.toString());
if (variable instanceof Constructor<?>) {
Constructor<?> constructor = (Constructor<?>) variable;
return delegate.resolve(context, constructor.getDeclaringClass().getName(), argumentTypes);

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@ -19,8 +19,11 @@ package net.abhinavsarkar.spelhelper;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.expression.AccessException;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.MethodExecutor;
@ -33,21 +36,24 @@ final class ImplicitMethodResolver implements MethodResolver {
private static final ConcurrentHashMap<String, MethodExecutor> CACHE =
new ConcurrentHashMap<String, MethodExecutor>();
private final ReflectiveMethodResolver delegate = new ReflectiveMethodResolver();
private static final MethodExecutor NULL_ME = new MethodExecutor() {
@Override
public TypedValue execute(final EvaluationContext context, final Object target,
final Object... arguments) throws AccessException {
return null;
throw new UnsupportedOperationException("This method should never be called");
}
};
private static final class ImplicitMethodExecutor implements
MethodExecutor {
private static final class ImplicitMethodExecutor implements MethodExecutor {
private final MethodExecutor executor;
public ImplicitMethodExecutor(final MethodExecutor executor) {
this.executor = executor;
}
@Override
public TypedValue execute(final EvaluationContext context, final Object target,
final Object... arguments) throws AccessException {
Object[] modifiedArguments = new Object[arguments.length + 1];
@ -57,8 +63,10 @@ final class ImplicitMethodResolver implements MethodResolver {
}
}
public MethodExecutor resolve(final EvaluationContext context,
final Object targetObject, final String name, final Class<?>[] argumentTypes)
@Override
public MethodExecutor resolve(
final EvaluationContext context, final Object targetObject,
final String name, final List<TypeDescriptor> argumentTypes)
throws AccessException {
if (targetObject == null) {
return null;
@ -78,13 +86,13 @@ final class ImplicitMethodResolver implements MethodResolver {
Class<?> firstParamType = parameterTypes[0];
if (parameterTypes.length > 0
&& firstParamType.isAssignableFrom(type)) {
Class<?>[] newArgumentTypes = new Class[argumentTypes.length + 1];
newArgumentTypes[0] = firstParamType;
System.arraycopy(argumentTypes, 0, newArgumentTypes,
1, argumentTypes.length);
MethodExecutor executor = new ReflectiveMethodResolver()
.resolve(context, method.getDeclaringClass(), name,
newArgumentTypes);
List<TypeDescriptor> newArgumentTypes = new ArrayList<TypeDescriptor>();
newArgumentTypes.add(TypeDescriptor.valueOf(firstParamType));
newArgumentTypes.addAll(argumentTypes);
MethodExecutor executor =
delegate.resolve(context, method.getDeclaringClass(),
name, newArgumentTypes);
MethodExecutor wrappedExecutor = executor == null ? null
: new ImplicitMethodExecutor(executor);
if (wrappedExecutor == null) {

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@ -18,8 +18,10 @@
package net.abhinavsarkar.spelhelper;
import java.text.MessageFormat;
import java.util.Collections;
import java.util.concurrent.ConcurrentHashMap;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.expression.AccessException;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.MethodExecutor;
@ -32,27 +34,38 @@ final class ImplicitPropertyAccessor extends ReadOnlyGenericPropertyAccessor {
private static final ConcurrentHashMap<String, MethodExecutor> CACHE =
new ConcurrentHashMap<String, MethodExecutor>();
private static final MethodExecutor NULL_ME = new MethodExecutor() {
@Override
public TypedValue execute(final EvaluationContext context, final Object target,
final Object... arguments) throws AccessException {
throw new UnsupportedOperationException("This method should never be called");
}
};
@Override
public boolean canRead(final EvaluationContext context,
final Object target, final String name)
throws AccessException {
Assert.notNull(target, "target is null");
String cacheKey = target.getClass().getName() + "." + name;
if (CACHE.containsKey(cacheKey)) {
return CACHE.get(cacheKey) != null;
return CACHE.get(cacheKey) != NULL_ME;
}
for (MethodResolver mr : context.getMethodResolvers()) {
MethodExecutor me = mr.resolve(context, target, name, new Class[0]);
MethodExecutor me =
mr.resolve(context, target, name, Collections.<TypeDescriptor>emptyList());
if (me != null) {
CACHE.putIfAbsent(cacheKey, me);
return true;
}
}
CACHE.putIfAbsent(cacheKey, null);
CACHE.putIfAbsent(cacheKey, NULL_ME);
return false;
}
@Override
public TypedValue read(final EvaluationContext context,
final Object target, final String name)
throws AccessException {

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@ -23,19 +23,21 @@ import org.springframework.expression.AccessException;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.PropertyAccessor;
abstract class ReadOnlyGenericPropertyAccessor implements
PropertyAccessor {
abstract class ReadOnlyGenericPropertyAccessor implements PropertyAccessor {
@Override
public final boolean canWrite(final EvaluationContext context,
final Object target, final String name) throws AccessException {
return false;
}
@Override
@SuppressWarnings("rawtypes")
public final Class[] getSpecificTargetClasses() {
return null;
}
@Override
public final void write(final EvaluationContext context, final Object target,
final String name, final Object newValue) throws AccessException {
throw new AccessException(MessageFormat.format(