com.github.liuyehcf.framework.rpc.ares.Converter Maven / Gradle / Ivy

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package com.github.liuyehcf.framework.rpc.ares;

import com.github.liuyehcf.framework.common.tools.type.TypeMatcher;

import javax.annotation.Nonnull;
import java.lang.reflect.Type;

/**
 * @author hechenfeng
 * @date 2020/4/9
 */
public abstract class Converter implements Comparable> {

    protected final Class inputType;
    protected final Class outputType;
    protected final TypeMatcher inputMatcher;

    protected Converter() {
        inputType = TypeMatcher.fetchType(this, Converter.class, "I");
        outputType = TypeMatcher.fetchType(this, Converter.class, "O");
        this.inputMatcher = TypeMatcher.create(inputType);
    }

    @Override
    public final int compareTo(@Nonnull Converter o) {
        return Integer.compare(o.order(), this.order());
    }

    /**
     * whether inputObject and outputType matches this converter
     *
     * @param inputObject input object
     * @param outputType  type of output
     */
    public abstract boolean match(Object inputObject, Type outputType);

    /**
     * convert from input to output
     *
     * @param input      object to be converted
     * @param outputType type of output
     * @return output
     */
    public abstract O convert(I input, Type outputType);

    /**
     * order of this converter
     */
    public abstract int order();
}