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Caching fields for a class for reducing the need for reflection.

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This commit is contained in:
Inderjeet Singh 2011-03-24 22:13:51 +00:00
parent 337d89cf3f
commit 0adf7f5e17
1 changed files with 13 additions and 1 deletions
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14
gson/src/main/java/com/google/gson/ReflectingFieldNavigator.java
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@ -16,6 +16,7 @@
package com.google.gson;
import com.google.gson.ObjectNavigator.Visitor;
import com.google.gson.internal.LruCache;
import com.google.gson.internal.Preconditions;
import com.google.gson.internal.Types;
@ -31,6 +32,8 @@ import java.lang.reflect.Type;
* @author Jesse Wilson
*/
final class ReflectingFieldNavigator {
private static final LruCache<Class<?>, Field[]> fieldsCache =
new LruCache<Class<?>, Field[]>(500);
private final ExclusionStrategy exclusionStrategy;
@ -59,7 +62,7 @@ final class ReflectingFieldNavigator {
private void navigateClassFields(Object obj, Type objType,
Class<?> classInInheritanceHierarchyForObj, Visitor visitor) {
Field[] fields = classInInheritanceHierarchyForObj.getDeclaredFields();
Field[] fields = getFields(classInInheritanceHierarchyForObj);
AccessibleObject.setAccessible(fields, true);
for (Field f : fields) {
FieldAttributes fieldAttributes = new FieldAttributes(classInInheritanceHierarchyForObj, f);
@ -80,6 +83,15 @@ final class ReflectingFieldNavigator {
}
}
private Field[] getFields(Class<?> clazz) {
Field[] fields = fieldsCache.get(clazz);
if (fields == null) {
fields = clazz.getDeclaredFields();
fieldsCache.put(clazz, fields);
}
return fields;
}
/**
* Evaluates the "actual" type for the field. If the field is a "TypeVariable" or has a