com.fasterxml.jackson.databind.util.BeanUtil Maven / Gradle / Ivy
Show all versions of jackson-databind Show documentation
package com.fasterxml.jackson.databind.util;
import com.fasterxml.jackson.databind.introspect.AnnotatedMethod;
/**
* Helper class that contains functionality needed by both serialization
* and deserialization side.
*/
public class BeanUtil
{
/*
/**********************************************************
/* Handling "getter" names
/**********************************************************
*/
public static String okNameForGetter(AnnotatedMethod am)
{
String name = am.getName();
String str = okNameForIsGetter(am, name);
if (str == null) {
str = okNameForRegularGetter(am, name);
}
return str;
}
public static String okNameForRegularGetter(AnnotatedMethod am, String name)
{
if (name.startsWith("get")) {
/* 16-Feb-2009, tatu: To handle [JACKSON-53], need to block
* CGLib-provided method "getCallbacks". Not sure of exact
* safe criteria to get decent coverage without false matches;
* but for now let's assume there's no reason to use any
* such getter from CGLib.
* But let's try this approach...
*/
if ("getCallbacks".equals(name)) {
if (isCglibGetCallbacks(am)) {
return null;
}
} else if ("getMetaClass".equals(name)) {
/* 30-Apr-2009, tatu: [JACKSON-103], need to suppress
* serialization of a cyclic (and useless) reference
*/
if (isGroovyMetaClassGetter(am)) {
return null;
}
}
return manglePropertyName(name.substring(3));
}
return null;
}
public static String okNameForIsGetter(AnnotatedMethod am, String name)
{
if (name.startsWith("is")) {
// plus, must return boolean...
Class rt = am.getRawType();
if (rt != Boolean.class && rt != Boolean.TYPE) {
return null;
}
return manglePropertyName(name.substring(2));
}
// no, not a match by name
return null;
}
public static String okNameForSetter(AnnotatedMethod am)
{
String name = okNameForMutator(am, "set");
if (name != null) {
// 26-Nov-2009 [JACSON-103], need to suppress this internal groovy method
if ("metaClass".equals(name)) {
if (isGroovyMetaClassSetter(am)) {
return null;
}
}
return name;
}
return null;
}
public static String okNameForMutator(AnnotatedMethod am, String prefix)
{
String name = am.getName();
if (name.startsWith(prefix)) {
return manglePropertyName(name.substring(prefix.length()));
}
return null;
}
/*
/**********************************************************
/* Helper methods for bean property name handling
/**********************************************************
*/
/**
* This method was added to address [JACKSON-53]: need to weed out
* CGLib-injected "getCallbacks".
* At this point caller has detected a potential getter method
* with name "getCallbacks" and we need to determine if it is
* indeed injectect by Cglib. We do this by verifying that the
* result type is "net.sf.cglib.proxy.Callback[]"
*
* Also, see [JACKSON-177]; Hibernate may repackage cglib
* it uses, so we better catch that too
*/
protected static boolean isCglibGetCallbacks(AnnotatedMethod am)
{
Class rt = am.getRawType();
// Ok, first: must return an array type
if (rt == null || !rt.isArray()) {
return false;
}
/* And that type needs to be "net.sf.cglib.proxy.Callback".
* Theoretically could just be a type that implements it, but
* for now let's keep things simple, fix if need be.
*/
Class compType = rt.getComponentType();
// Actually, let's just verify it's a "net.sf.cglib.*" class/interface
Package pkg = compType.getPackage();
if (pkg != null) {
String pname = pkg.getName();
if (pname.startsWith("net.sf.cglib")
// also, as per [JACKSON-177]
|| pname.startsWith("org.hibernate.repackage.cglib")) {
return true;
}
}
return false;
}
/**
* Similar to {@link #isCglibGetCallbacks}, need to suppress
* a cyclic reference to resolve [JACKSON-103]
*/
protected static boolean isGroovyMetaClassSetter(AnnotatedMethod am)
{
Class argType = am.getRawParameterType(0);
Package pkg = argType.getPackage();
if (pkg != null && pkg.getName().startsWith("groovy.lang")) {
return true;
}
return false;
}
/**
* Another helper method to deal with rest of [JACKSON-103]
*/
protected static boolean isGroovyMetaClassGetter(AnnotatedMethod am)
{
Class rt = am.getRawType();
if (rt == null || rt.isArray()) {
return false;
}
Package pkg = rt.getPackage();
if (pkg != null && pkg.getName().startsWith("groovy.lang")) {
return true;
}
return false;
}
/**
* Method called to figure out name of the property, given
* corresponding suggested name based on a method or field name.
*
* @param basename Name of accessor/mutator method, not including prefix
* ("get"/"is"/"set")
*/
protected static String manglePropertyName(String basename)
{
int len = basename.length();
// First things first: empty basename is no good
if (len == 0) {
return null;
}
// otherwise, lower case initial chars
StringBuilder sb = null;
for (int i = 0; i < len; ++i) {
char upper = basename.charAt(i);
char lower = Character.toLowerCase(upper);
if (upper == lower) {
break;
}
if (sb == null) {
sb = new StringBuilder(basename);
}
sb.setCharAt(i, lower);
}
return (sb == null) ? basename : sb.toString();
}
}