76 lines
2.5 KiB
Java
76 lines
2.5 KiB
Java
/*
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* To change this license header, choose License Headers in Project Properties.
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* To change this template file, choose Tools | Templates
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* and open the template in the editor.
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*/
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package com.wentch.redkale.convert;
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import java.lang.reflect.*;
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/**
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* 对象数组的反序列化，不包含int[]、long[]这样的primitive class数组.
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* 数组长度不能超过 32767。 在BSON中数组长度设定的是short，对于大于32767长度的数组传输会影响性能，所以没有采用int存储。
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* 支持一定程度的泛型。
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*
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* @author zhangjx
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* @param <T>
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*/
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@SuppressWarnings("unchecked")
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public final class ArrayEncoder<T> implements Encodeable<Writer, T[]> {
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private final Type type;
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private final Type componentType;
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private final Encodeable anyEncoder;
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private final Encodeable<Writer, Object> encoder;
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public ArrayEncoder(final Factory factory, final Type type) {
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this.type = type;
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if (type instanceof GenericArrayType) {
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Type t = ((GenericArrayType) type).getGenericComponentType();
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this.componentType = t instanceof TypeVariable ? Object.class : t;
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} else if ((type instanceof Class) && ((Class) type).isArray()) {
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this.componentType = ((Class) type).getComponentType();
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} else {
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throw new ConvertException("(" + type + ") is not a array type");
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}
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factory.register(type, this);
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this.encoder = factory.loadEncoder(this.componentType);
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this.anyEncoder = factory.getAnyEncoder();
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}
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@Override
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public void convertTo(Writer out, T[] value) {
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if (value == null) {
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out.writeNull();
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return;
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}
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if (value.length == 0) {
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out.writeArrayB(0);
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out.writeArrayE();
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return;
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}
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out.writeArrayB(value.length);
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final Type comp = this.componentType;
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boolean first = true;
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for (Object v : value) {
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if (!first) out.writeArrayMark();
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((v != null && v.getClass() == comp) ? encoder : anyEncoder).convertTo(out, v);
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if (first) first = false;
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}
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out.writeArrayE();
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}
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@Override
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public String toString() {
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return this.getClass().getSimpleName() + "{componentType:" + this.componentType + ", encoder:" + this.encoder + "}";
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}
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@Override
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public Type getType() {
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return type;
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}
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}
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