117 lines
3.8 KiB
Java
117 lines
3.8 KiB
Java
/*
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* This file is part of Applied Energistics 2.
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* Copyright (c) 2013 - 2014, AlgorithmX2, All rights reserved.
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*
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* Applied Energistics 2 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Applied Energistics 2 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Applied Energistics 2. If not, see <http://www.gnu.org/licenses/lgpl>.
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*/
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package appeng.util;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.InvocationTargetException;
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import appeng.core.AELog;
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import com.google.common.base.Optional;
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public class ClassInstantiation<T> {
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private final Class<? extends T> template;
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private final Object[] args;
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public ClassInstantiation(final Class<? extends T> template, final Object... args) {
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this.template = template;
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this.args = args;
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}
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public Optional<T> get() {
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@SuppressWarnings("unchecked")
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final Constructor<T>[] constructors
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= (Constructor<T>[]) this.template.getConstructors();
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for (final Constructor<T> constructor : constructors) {
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final Class<?>[] paramTypes = constructor.getParameterTypes();
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if (paramTypes.length == this.args.length) {
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boolean valid = true;
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for (int idx = 0; idx < paramTypes.length; idx++) {
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final Class<?> cz = this.args[idx].getClass();
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if (!this.isClassMatch(paramTypes[idx], cz, this.args[idx])) {
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valid = false;
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}
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}
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if (valid) {
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try {
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return Optional.of(constructor.newInstance(this.args));
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} catch (final InstantiationException e) {
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e.printStackTrace();
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} catch (final IllegalAccessException e) {
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e.printStackTrace();
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} catch (final InvocationTargetException e) {
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e.printStackTrace();
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}
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break;
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}
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}
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}
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return Optional.absent();
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}
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private boolean isClassMatch(Class<?> expected, Class<?> got, final Object value) {
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if (value == null && !expected.isPrimitive()) {
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return true;
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}
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expected = this.condense(
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expected,
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Boolean.class,
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Character.class,
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Byte.class,
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Short.class,
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Integer.class,
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Long.class,
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Float.class,
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Double.class
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);
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got = this.condense(
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got,
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Boolean.class,
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Character.class,
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Byte.class,
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Short.class,
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Integer.class,
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Long.class,
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Float.class,
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Double.class
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);
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return expected == got || expected.isAssignableFrom(got);
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}
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private Class<?> condense(final Class<?> expected, final Class<?>... wrappers) {
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if (expected.isPrimitive()) {
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for (final Class clz : wrappers) {
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try {
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if (expected == clz.getField("TYPE").get(null)) {
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return clz;
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}
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} catch (final Throwable t) {
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AELog.debug(t);
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}
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}
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}
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return expected;
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}
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}
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