com.fasterxml.jackson.databind.introspect.SimpleMixInResolver Maven / Gradle / Ivy
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package com.fasterxml.jackson.databind.introspect;
import java.util.HashMap;
import java.util.Map;
import com.fasterxml.jackson.databind.type.ClassKey;
/**
* Simple implementation of {@link ClassIntrospector.MixInResolver}
* that just uses a {@link java.util.Map} for containing mapping
* from target to mix-in classes.
*
* Implementation is only thread-safe after initialization (that is,
* when underlying Map is not modified but only read).
*
* @since 2.6
*/
public class SimpleMixInResolver
implements ClassIntrospector.MixInResolver,
java.io.Serializable
{
private static final long serialVersionUID = 1L;
/**
* External resolver that gets called before looking at any locally defined
* mix-in target classes.
*/
protected final ClassIntrospector.MixInResolver _overrides;
/**
* Simple mix-in targets defined locally.
*/
protected Map> _localMixIns;
public SimpleMixInResolver(ClassIntrospector.MixInResolver overrides) {
_overrides = overrides;
}
protected SimpleMixInResolver(ClassIntrospector.MixInResolver overrides,
Map> mixins) {
_overrides = overrides;
_localMixIns = mixins;
}
/**
* Mutant factory for constructor a new resolver instance with given
* mix-in resolver override.
*/
public SimpleMixInResolver withOverrides(ClassIntrospector.MixInResolver overrides) {
return new SimpleMixInResolver(overrides, _localMixIns);
}
/**
* Mutant factory method that constructs a new instance that has no locally
* defined mix-in/target mappings.
*/
public SimpleMixInResolver withoutLocalDefinitions() {
return new SimpleMixInResolver(_overrides, null);
}
public void setLocalDefinitions(Map, Class> sourceMixins) {
if (sourceMixins == null || sourceMixins.isEmpty()) {
_localMixIns = null;
} else {
Map> mixIns = new HashMap>(sourceMixins.size());
for (Map.Entry,Class> en : sourceMixins.entrySet()) {
mixIns.put(new ClassKey(en.getKey()), en.getValue());
}
_localMixIns = mixIns;
}
}
public void addLocalDefinition(Class target, Class mixinSource) {
if (_localMixIns == null) {
_localMixIns = new HashMap>();
}
_localMixIns.put(new ClassKey(target), mixinSource);
}
@Override
public SimpleMixInResolver copy() {
ClassIntrospector.MixInResolver overrides = (_overrides == null)
? null : _overrides.copy();
Map> mixIns = (_localMixIns == null)
? null : new HashMap>(_localMixIns);
return new SimpleMixInResolver(overrides, mixIns);
}
@Override
public Class findMixInClassFor(Class cls)
{
Class mixin = (_overrides == null) ? null : _overrides.findMixInClassFor(cls);
if (mixin == null && (_localMixIns != null)) {
mixin = _localMixIns.get(new ClassKey(cls));
}
return mixin;
}
public int localSize() {
return (_localMixIns == null) ? 0 : _localMixIns.size();
}
/**
* Method that may be called for optimization purposes, to see if calls to
* mix-in resolver may be avoided. Return value of {@code true} means that
* it is possible that a mix-in class will be found; {@code false} that no
* mix-in will ever be found. In latter case caller can avoid calls altogether.
*
* Note that the reason for "empty" resolvers is to use "null object" for simplifying
* code.
*
* @return True, if this resolver MAY have mix-ins to apply; false if not (it
* is "empty")
*
* @since 2.10.1
*/
public boolean hasMixIns() {
if (_localMixIns == null) {
// if neither local mix-ins nor overrides, no mix-ins
if (_overrides == null) {
return false;
}
// or, if no local mix-ins and can delegate to resolver
if (_overrides instanceof SimpleMixInResolver) {
return ((SimpleMixInResolver) _overrides).hasMixIns();
}
}
// cannot rule out the possibility, so...
return true;
}
}