src/org/redkale/convert/ArrayDecoder.java

@@ -0,0 +1,82 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package org.redkale.convert;
+
+import java.lang.reflect.*;
+import java.util.*;
+
+/**
+ * 对象数组的序列化，不包含int[]、long[]这样的primitive class数组.
+ * 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。
+ * 支持一定程度的泛型。
+ *
+ * <p>
+ * 详情见: http://www.redkale.org
+ *
+ * @author zhangjx
+ * @param <T> 反解析的数组元素类型
+ */
+@SuppressWarnings("unchecked")
+public final class ArrayDecoder<T> implements Decodeable<Reader, T[]> {
+
+    private final Type type;
+
+    private final Type componentType;
+
+    private final Class componentClass;
+
+    private final Decodeable<Reader, T> decoder;
+
+    public ArrayDecoder(final ConvertFactory factory, final Type type) {
+        this.type = type;
+        if (type instanceof GenericArrayType) {
+            Type t = ((GenericArrayType) type).getGenericComponentType();
+            this.componentType = t instanceof TypeVariable ? Object.class : t;
+        } else if ((type instanceof Class) && ((Class) type).isArray()) {
+            this.componentType = ((Class) type).getComponentType();
+        } else {
+            throw new ConvertException("(" + type + ") is not a array type");
+        }
+        if (this.componentType instanceof ParameterizedType) {
+            this.componentClass = (Class) ((ParameterizedType) this.componentType).getRawType();
+        } else {
+            this.componentClass = (Class) this.componentType;
+        }
+        factory.register(type, this);
+        this.decoder = factory.loadDecoder(this.componentType);
+    }
+
+    @Override
+    public T[] convertFrom(Reader in) {
+        final int len = in.readArrayB();
+        if (len == Reader.SIGN_NULL) return null;
+        final Decodeable<Reader, T> localdecoder = this.decoder;
+        final List<T> result = new ArrayList();
+        if (len == Reader.SIGN_NOLENGTH) {
+            while (in.hasNext()) {
+                result.add(localdecoder.convertFrom(in));
+            }
+        } else {
+            for (int i = 0; i < len; i++) {
+                result.add(localdecoder.convertFrom(in));
+            }
+        }
+        in.readArrayE();
+        T[] rs = (T[]) Array.newInstance((Class) this.componentClass, result.size());
+        return result.toArray(rs);
+    }
+
+    @Override
+    public String toString() {
+        return this.getClass().getSimpleName() + "{componentType:" + this.componentType + ", decoder:" + this.decoder + "}";
+    }
+
+    @Override
+    public Type getType() {
+        return type;
+    }
+
+}