net.vidageek.mirror.invoke.ConstructorHandlerByConstructor Maven / Gradle / Ivy

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/**
 * 
 */
package net.vidageek.mirror.invoke;

import java.lang.reflect.Constructor;

import net.vidageek.mirror.invoke.dsl.ConstructorHandler;
import net.vidageek.mirror.provider.ConstructorReflectionProvider;
import net.vidageek.mirror.provider.ReflectionProvider;

/**
 * This class is responsible for invoking a constructor provided.
 * 
 * @author jonasabreu
 */
public final class ConstructorHandlerByConstructor implements ConstructorHandler {

	private final Constructor constructor;

	private final Class clazz;

	private final ReflectionProvider provider;

	public ConstructorHandlerByConstructor(final ReflectionProvider provider, final Class clazz,
			final Constructor con) {
		if (clazz == null) {
			throw new IllegalArgumentException("clazz cannot be null");
		}
		if (con == null) {
			throw new IllegalArgumentException("constructor cannot be null");
		}
		if (!clazz.equals(con.getDeclaringClass())) {
			throw new IllegalArgumentException("constructor declaring type should be " + clazz.getName() + " but was "
					+ con.getDeclaringClass().getName());
		}
		this.provider = provider;
		this.clazz = clazz;
		this.constructor = con;
	}

	/**
	 * {@inheritDoc ConstructorHandler#withArgs(Object...)}
	 * 
	 * @see ConstructorReflectionProvider#setAccessible()
	 * @see ConstructorReflectionProvider#instantiate(Object...)
	 */
	public T withArgs(final Object... args) {
		ConstructorReflectionProvider constructorReflectionProvider = provider.getConstructorReflectionProvider(
				clazz, constructor);
		constructorReflectionProvider.setAccessible();
		return constructorReflectionProvider.instantiate(args);
	}

	/**
	 * {@inheritDoc ConstructorHandler#withoutArgs()}
	 * 
	 * This is a convenience method for
	 * {@link ConstructorHandlerByConstructor#withArgs(Object...)}
	 * 
	 * @see ConstructorHandlerByConstructor#withArgs(Object...)
	 */
	public T withoutArgs() {
		return withArgs(new Object[0]);
	}

}