aQute.lib.json.SpecialHandler Maven / Gradle / Ivy

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bndlib: A Swiss Army Knife for OSGi

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package aQute.lib.json;

import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.Map;
import java.util.regex.Pattern;

public class SpecialHandler extends Handler {
	@SuppressWarnings("rawtypes")
	final Class				type;
	final Method			valueOf;
	final Constructor< ? >	constructor;

	public SpecialHandler(Class< ? > type, Constructor< ? > constructor, Method valueOf) {
		this.type = type;
		this.constructor = constructor;
		this.valueOf = valueOf;
	}

	@Override
	public void encode(Encoder app, Object object, Map visited) throws IOException, Exception {
		StringHandler.string(app, object.toString());
	}

	@Override
	public Object decode(Decoder dec, String s) throws Exception {
		if (type == Pattern.class)
			return Pattern.compile(s);

		if (constructor != null)
			return constructor.newInstance(s);

		if (valueOf != null)
			return valueOf.invoke(null, s);

		throw new IllegalArgumentException("Do not know how to convert a " + type + " from a string");
	}

}