123 lines
3.1 KiB
Java
123 lines
3.1 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 java.util.Optional;
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import appeng.core.AELog;
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public class ClassInstantiation<T>
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{
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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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{
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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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{
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@SuppressWarnings( "unchecked" )
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final Constructor<T>[] constructors = (Constructor<T>[]) this.template.getConstructors();
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for( final Constructor<T> constructor : constructors )
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{
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final Class<?>[] paramTypes = constructor.getParameterTypes();
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if( paramTypes.length == this.args.length )
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{
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boolean valid = true;
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for( int idx = 0; idx < paramTypes.length; idx++ )
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{
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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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{
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valid = false;
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}
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}
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if( valid )
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{
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try
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{
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return Optional.of( constructor.newInstance( this.args ) );
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}
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catch( final InstantiationException e )
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{
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e.printStackTrace();
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}
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catch( final IllegalAccessException e )
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{
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e.printStackTrace();
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}
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catch( final InvocationTargetException e )
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{
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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.empty();
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}
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private boolean isClassMatch( Class<?> expected, Class<?> got, final Object value )
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{
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if( value == null && !expected.isPrimitive() )
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{
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return true;
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}
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expected = this.condense( expected, Boolean.class, Character.class, Byte.class, Short.class, Integer.class, Long.class, Float.class, Double.class );
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got = this.condense( got, Boolean.class, Character.class, Byte.class, Short.class, Integer.class, Long.class, Float.class, Double.class );
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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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{
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if( expected.isPrimitive() )
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{
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for( final Class clz : wrappers )
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{
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try
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{
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if( expected == clz.getField( "TYPE" ).get( null ) )
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{
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return clz;
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}
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}
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catch( final Throwable t )
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{
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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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