org.redkale.convert.OptionalCoder Maven / Gradle / Ivy
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package org.redkale.convert;
import java.lang.reflect.*;
import java.util.*;
/**
* Optional 的SimpledCoder实现
*
*
* 详情见: https://redkale.org
*
* @author zhangjx
* @param Reader输入的子类型
* @param Writer输出的子类型
*/
public class OptionalCoder extends SimpledCoder> {
private final Type type;
private final Type componentType;
protected final Class componentClass;
protected final Decodeable decoder;
protected final Encodeable encoder;
private boolean inited = false;
private final Object lock = new Object();
@SuppressWarnings("unchecked")
public OptionalCoder(final ConvertFactory factory, final Type type) {
this.type = type;
try {
if (type instanceof ParameterizedType) {
final ParameterizedType pt = (ParameterizedType) type;
this.componentType = pt.getActualTypeArguments()[0];
factory.register(type, this);
this.decoder = factory.loadDecoder(this.componentType);
if (this.componentType instanceof TypeVariable) {
this.encoder = factory.getAnyEncoder();
this.componentClass = Object.class;
} else {
if (componentType instanceof ParameterizedType) {
final ParameterizedType pt2 = (ParameterizedType) componentType;
this.componentClass = (Class) pt2.getRawType();
} else {
this.componentClass = (Class) componentType;
}
this.encoder = factory.loadEncoder(this.componentType);
}
} else {
this.componentType = Object.class;
this.componentClass = Object.class;
this.decoder = factory.loadDecoder(this.componentType);
this.encoder = factory.getAnyEncoder();
}
} finally {
inited = true;
synchronized (lock) {
lock.notifyAll();
}
}
}
@Override
public void convertTo(W out, Optional value) {
if (value == null || !value.isPresent()) {
out.writeObjectNull(null);
return;
}
if (this.encoder == null) {
if (!this.inited) {
synchronized (lock) {
try {
lock.wait();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
this.encoder.convertTo(out, value.get());
}
@Override
public Optional convertFrom(R in) {
if (this.decoder == null) {
if (!this.inited) {
synchronized (lock) {
try {
lock.wait();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
return Optional.ofNullable(this.decoder.convertFrom(in));
}
}