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DATACMNS-533 - Expose special parameters in SpEL expressions.

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We now expose special parameters like Pageable and Sort to be used in SpEL expressions if they don't collide with existing named parameters.

Related pull request: spring-projects/spring-data-jpa#101
Related ticket: DATAJPA-564
This commit is contained in:
Thomas Darimont
2014-07-07 17:58:44 +02:00
committed by Oliver Gierke
parent d23e7baa2c
commit 31848f87eb
3 changed files with 96 additions and 8 deletions
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54
src/main/java/org/springframework/data/repository/query/ExtensionAwareEvaluationContextProvider.java
View File

@@ -42,6 +42,7 @@ import org.springframework.expression.spel.SpelMessage;
import org.springframework.expression.spel.support.ReflectivePropertyAccessor;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
import org.springframework.util.TypeUtils;
/**
@@ -109,16 +110,53 @@ public class ExtensionAwareEvaluationContextProvider implements EvaluationContex
// Add parameters for indexed access
ec.setRootObject(parameterValues);
// Add parameters as variables if named
for (Parameter param : parameters) {
if (param.isNamedParameter()) {
ec.setVariable(param.getName(), parameterValues[param.getIndex()]);
}
}
Map<String, Object> variables = collectVariables(parameters, parameterValues);
ec.setVariables(variables);
return ec;
}
protected <T extends Parameters<T, ? extends Parameter>> Map<String, Object> collectVariables(T parameters,
Object[] parameterValues) {
Map<String, Object> variables = new HashMap<String, Object>();
registerSpecialParameterVariablesIfPresent(parameters, parameterValues, variables);
registerNamedMethodParameterVariables(parameters, parameterValues, variables);
return variables;
}
protected <T extends Parameters<T, ? extends Parameter>> void registerNamedMethodParameterVariables(T parameters,
Object[] parameterValues, Map<String, Object> variables) {
for (Parameter param : parameters) {
if (param.isNamedParameter()) {
variables.put(param.getName(), parameterValues[param.getIndex()]);
}
}
}
protected <T extends Parameters<T, ? extends Parameter>> void registerSpecialParameterVariablesIfPresent(
T parameters, Object[] parameterValues, Map<String, Object> variables) {
if (parameters.hasSpecialParameter()) {
for (Parameter param : parameters) {
if (param.isSpecialParameter()) {
Object paramValue = parameterValues[param.getIndex()];
if (paramValue == null) {
continue;
}
variables.put(StringUtils.uncapitalize(param.getType().getSimpleName()), paramValue);
}
}
}
}
/**
* Returns the {@link EvaluationContextExtension} to be used. Either from the current configuration or the configured
* {@link BeanFactory}.
@@ -251,6 +289,10 @@ public class ExtensionAwareEvaluationContextProvider implements EvaluationContex
final Method function = targetObject instanceof Map && ((Map<?, ?>) targetObject).containsKey(name) ? (Method) ((Map<?, ?>) targetObject)
.get(name) : (Method) functions.get(name);
if (function == null) {
return null;
}
Class<?>[] parameterTypes = function.getParameterTypes();
if (parameterTypes.length != argumentTypes.size()) {
return null;

2
src/main/java/org/springframework/data/repository/query/Parameters.java
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@@ -37,7 +37,7 @@ import org.springframework.util.Assert;
*/
public abstract class Parameters<S extends Parameters<S, T>, T extends Parameter> implements Iterable<T> {
@SuppressWarnings("unchecked") public static final List<Class<?>> TYPES = Arrays.asList(Pageable.class, Sort.class);
public static final List<Class<?>> TYPES = Arrays.asList(Pageable.class, Sort.class);
private static final String PARAM_ON_SPECIAL = format("You must not user @%s on a parameter typed %s or %s",
Param.class.getSimpleName(), Pageable.class.getSimpleName(), Sort.class.getSimpleName());