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    • com.fasterxml.jackson.databind.ser.impl.ReadOnlyClassToSerializerMap Maven / Gradle / Ivy

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    This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

    There is a newer version: 35.0.0.Beta1
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    package com.fasterxml.jackson.databind.ser.impl;

import java.util.*;

import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.util.TypeKey;

/**
 * Optimized lookup table for accessing two types of serializers; typed
 * and non-typed. Only accessed from a single thread, so no synchronization
 * needed for accessors.
 *
    
 * Note that before 2.6 this class was much smaller, and referred most
 * operations to separate JsonSerializerMap, but in 2.6
 * functions were combined.
 */
public final class ReadOnlyClassToSerializerMap
{
    private final Bucket[] _buckets;

    private final int _size;

    private final int _mask;

    public ReadOnlyClassToSerializerMap(Map> serializers)
    {
        int size = findSize(serializers.size());
        _size = size;
        _mask = (size-1);
        Bucket[] buckets = new Bucket[size];
        for (Map.Entry> entry : serializers.entrySet()) {
            TypeKey key = entry.getKey();
            int index = key.hashCode() & _mask;
            buckets[index] = new Bucket(buckets[index], key, entry.getValue());
        }
        _buckets = buckets;
    }
    
    private final static int findSize(int size)
    {
        // For small enough results (64 or less), we'll require <= 50% fill rate; otherwise 80%
        int needed = (size <= 64) ? (size + size) : (size + (size >> 2));
        int result = 8;
        while (result < needed) {
            result += result;
        }
        return result;
    }

    /**
     * Factory method for constructing an instance.
     */
    public static ReadOnlyClassToSerializerMap from(HashMap> src) {
        return new ReadOnlyClassToSerializerMap(src);
    }

    /*
    /**********************************************************
    /* Public API
    /**********************************************************
     */

    public int size() { return _size; }
    
    public JsonSerializer typedValueSerializer(JavaType type)
    {
        Bucket bucket = _buckets[TypeKey.typedHash(type) & _mask];
        if (bucket == null) {
            return null;
        }
        if (bucket.matchesTyped(type)) {
            return bucket.value;
        }
        while ((bucket = bucket.next) != null) {
            if (bucket.matchesTyped(type)) {
                return bucket.value;
            }
        }
        return null;
    }

    public JsonSerializer typedValueSerializer(Class type)
    {
        Bucket bucket = _buckets[TypeKey.typedHash(type) & _mask];
        if (bucket == null) {
            return null;
        }
        if (bucket.matchesTyped(type)) {
            return bucket.value;
        }
        while ((bucket = bucket.next) != null) {
            if (bucket.matchesTyped(type)) {
                return bucket.value;
            }
        }
        return null;
    }

    public JsonSerializer untypedValueSerializer(JavaType type)
    {
        Bucket bucket = _buckets[TypeKey.untypedHash(type) & _mask];
        if (bucket == null) {
            return null;
        }
        if (bucket.matchesUntyped(type)) {
            return bucket.value;
        }
        while ((bucket = bucket.next) != null) {
            if (bucket.matchesUntyped(type)) {
                return bucket.value;
            }
        }
        return null;
    }

    public JsonSerializer untypedValueSerializer(Class type)
    {
        Bucket bucket = _buckets[TypeKey.untypedHash(type) & _mask];
        if (bucket == null) {
            return null;
        }
        if (bucket.matchesUntyped(type)) {
            return bucket.value;
        }
        while ((bucket = bucket.next) != null) {
            if (bucket.matchesUntyped(type)) {
                return bucket.value;
            }
        }
        return null;
    }    

    /*
    /**********************************************************
    /* Helper classes
    /**********************************************************
     */

    private final static class Bucket
    {
        public final JsonSerializer value;
        public final Bucket next;

        protected final Class _class;
        protected final JavaType _type;

        protected final boolean _isTyped;
        
        public Bucket(Bucket next, TypeKey key, JsonSerializer value)
        {
            this.next = next;
            this.value = value;
            _isTyped = key.isTyped();
            _class = key.getRawType();
            _type = key.getType();
        }

        public boolean matchesTyped(Class key) {
            return (_class == key) && _isTyped;
        }

        public boolean matchesUntyped(Class key) {
            return (_class == key) && !_isTyped;
        }

        public boolean matchesTyped(JavaType key) {
            return _isTyped && key.equals(_type);
        }

        public boolean matchesUntyped(JavaType key) {
            return !_isTyped && key.equals(_type);
        }
    }
}
    
    
    
    

    




    
    
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