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Polish documentation and implementation of SpEL's Indexer

This commit is contained in:
Sam Brannen 2024-05-28 15:24:48 +02:00
parent 726ac9110c
commit defb6b7a62
1 changed files with 18 additions and 13 deletions
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31
spring-expression/src/main/java/org/springframework/expression/spel/ast/Indexer.java
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@ -54,10 +54,11 @@ import org.springframework.util.ReflectionUtils;
*
* <ul>
* <li>Arrays: the n<sup>th</sup> element</li>
* <li>Collections (lists and sets): the n<sup>th</sup> element</li>
* <li>Collections (lists, sets, etc.): the n<sup>th</sup> element</li>
* <li>Strings: the n<sup>th</sup> character as a {@link String}</li>
* <li>Maps: the value for the specified key</li>
* <li>Objects: the property with the specified name</li>
* <li>Custom Structures: via registered {@link IndexAccessor} implementations</li>
* </ul>
*
* <h3>Null-safe Indexing</h3>
@ -72,6 +73,9 @@ import org.springframework.util.ReflectionUtils;
* @author Stephane Nicoll
* @author Sam Brannen
* @since 3.0
* @see org.springframework.expression.IndexAccessor
* @see org.springframework.expression.spel.CompilableIndexAccessor
* @see org.springframework.expression.spel.support.ReflectiveIndexAccessor
*/
public class Indexer extends SpelNodeImpl {
@ -385,7 +389,7 @@ public class Indexer extends SpelNodeImpl {
mv.visitTypeInsn(CHECKCAST, "java/util/Map");
// Special case when the key is an unquoted string literal that will be parsed as
// a property/field reference
if ((index instanceof PropertyOrFieldReference reference)) {
if (index instanceof PropertyOrFieldReference reference) {
String mapKeyName = reference.getName();
mv.visitLdcInsn(mapKeyName);
}
@ -849,6 +853,7 @@ public class Indexer extends SpelNodeImpl {
exitTypeDescriptor = CodeFlow.toDescriptor(Object.class);
return new TypedValue(o, this.collectionEntryDescriptor.elementTypeDescriptor(o));
}
int pos = 0;
for (Object o : this.collection) {
if (pos == this.index) {
@ -856,23 +861,23 @@ public class Indexer extends SpelNodeImpl {
}
pos++;
}
throw new IllegalStateException("Failed to find indexed element " + this.index + ": " + this.collection);
throw new SpelEvaluationException(getStartPosition(), SpelMessage.COLLECTION_INDEX_OUT_OF_BOUNDS,
this.collection.size(), this.index);
}
@Override
public void setValue(@Nullable Object newValue) {
growCollectionIfNecessary();
if (this.collection instanceof List list) {
if (this.collectionEntryDescriptor.getElementTypeDescriptor() != null) {
newValue = this.typeConverter.convertValue(newValue, TypeDescriptor.forObject(newValue),
this.collectionEntryDescriptor.getElementTypeDescriptor());
}
list.set(this.index, newValue);
}
else {
if (!(this.collection instanceof List list)) {
throw new SpelEvaluationException(getStartPosition(), SpelMessage.INDEXING_NOT_SUPPORTED_FOR_TYPE,
this.collectionEntryDescriptor.toString());
}
growCollectionIfNecessary();
if (this.collectionEntryDescriptor.getElementTypeDescriptor() != null) {
newValue = this.typeConverter.convertValue(newValue, TypeDescriptor.forObject(newValue),
this.collectionEntryDescriptor.getElementTypeDescriptor());
}
list.set(this.index, newValue);
}
private void growCollectionIfNecessary() {
@ -906,7 +911,7 @@ public class Indexer extends SpelNodeImpl {
@Override
public boolean isWritable() {
return true;
return (this.collection instanceof List);
}
@Nullable