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126 changes: 126 additions & 0 deletions
126
src/main/java/com/fasterxml/jackson/databind/deser/impl/JDKValueInstantiators.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| package com.fasterxml.jackson.databind.deser.impl; | ||
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| import java.io.IOException; | ||
| import java.util.ArrayList; | ||
| import java.util.Collection; | ||
| import java.util.Collections; | ||
| import java.util.LinkedHashMap; | ||
| import java.util.Map; | ||
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| import com.fasterxml.jackson.core.JsonLocation; | ||
| import com.fasterxml.jackson.databind.DeserializationConfig; | ||
| import com.fasterxml.jackson.databind.DeserializationContext; | ||
| import com.fasterxml.jackson.databind.deser.ValueInstantiator; | ||
| import com.fasterxml.jackson.databind.deser.std.JsonLocationInstantiator; | ||
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| /** | ||
| * Container for a set of {@link ValueInstantiator}s used for certain critical | ||
| * JDK value types, either as performance optimization for initialization time observed | ||
| * by profiling, or due to difficulty in otherwise finding constructors. | ||
| * | ||
| * @since 2.10 | ||
| */ | ||
| public abstract class JDKValueInstantiators | ||
| { | ||
| public static ValueInstantiator findStdValueInstantiator(DeserializationConfig config, | ||
| Class<?> raw) | ||
| { | ||
| if (raw == JsonLocation.class) { | ||
| return new JsonLocationInstantiator(); | ||
| } | ||
| // [databind#1868]: empty List/Set/Map | ||
| if (Collection.class.isAssignableFrom(raw)) { | ||
| if (raw == ArrayList.class) { | ||
| return ArrayListInstantiator.INSTANCE; | ||
| } | ||
| // [databind#XXX]: optimize commonly needed default creators | ||
| if (Collections.EMPTY_SET.getClass() == raw) { | ||
| return new ConstantValueInstantiator(Collections.EMPTY_SET); | ||
| } | ||
| if (Collections.EMPTY_LIST.getClass() == raw) { | ||
| return new ConstantValueInstantiator(Collections.EMPTY_LIST); | ||
| } | ||
| } else if (Map.class.isAssignableFrom(raw)) { | ||
| if (raw == LinkedHashMap.class) { | ||
| return LinkedHashMapInstantiator.INSTANCE; | ||
| } | ||
| if (Collections.EMPTY_MAP.getClass() == raw) { | ||
| return new ConstantValueInstantiator(Collections.EMPTY_MAP); | ||
| } | ||
| } | ||
| return null; | ||
| } | ||
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| private static class ArrayListInstantiator | ||
| extends ValueInstantiator.Base | ||
| implements java.io.Serializable | ||
| { | ||
| private static final long serialVersionUID = 2L; | ||
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| public final static ArrayListInstantiator INSTANCE = new ArrayListInstantiator(); | ||
| public ArrayListInstantiator() { | ||
| super(ArrayList.class); | ||
| } | ||
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| @Override | ||
| public boolean canInstantiate() { return true; } | ||
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| @Override | ||
| public boolean canCreateUsingDefault() { return true; } | ||
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| @Override | ||
| public Object createUsingDefault(DeserializationContext ctxt) throws IOException { | ||
| return new ArrayList<>(); | ||
| } | ||
| } | ||
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| private static class LinkedHashMapInstantiator | ||
| extends ValueInstantiator.Base | ||
| implements java.io.Serializable | ||
| { | ||
| private static final long serialVersionUID = 2L; | ||
|
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| public final static LinkedHashMapInstantiator INSTANCE = new LinkedHashMapInstantiator(); | ||
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| public LinkedHashMapInstantiator() { | ||
| super(LinkedHashMap.class); | ||
| } | ||
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| @Override | ||
| public boolean canInstantiate() { return true; } | ||
|
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| @Override | ||
| public boolean canCreateUsingDefault() { return true; } | ||
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| @Override | ||
| public Object createUsingDefault(DeserializationContext ctxt) throws IOException { | ||
| return new LinkedHashMap<>(); | ||
| } | ||
| } | ||
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| private static class ConstantValueInstantiator | ||
| extends ValueInstantiator.Base | ||
| implements java.io.Serializable | ||
| { | ||
| private static final long serialVersionUID = 2L; | ||
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| protected final Object _value; | ||
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| public ConstantValueInstantiator(Object value) { | ||
| super(value.getClass()); | ||
| _value = value; | ||
| } | ||
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| @Override // yes, since default ctor works | ||
| public boolean canInstantiate() { return true; } | ||
|
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| @Override | ||
| public boolean canCreateUsingDefault() { return true; } | ||
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| @Override | ||
| public Object createUsingDefault(DeserializationContext ctxt) throws IOException { | ||
| return _value; | ||
| } | ||
| } | ||
|
|
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| } |
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38 changes: 0 additions & 38 deletions
38
src/main/java/com/fasterxml/jackson/databind/util/ConstantValueInstantiator.java
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