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Tensorics is a java framework which uses a tensor as a central object. A tensor represents a set of values placed in an N-dimensional space. Wherever you are tempted to use maps of maps, a tensor might be a good choice ;-) Tensorics provides methods to create, transform and performing calculations with those tensors.

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// @formatter:off
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 *
 * This file is part of tensorics.
 * 
 * Copyright (c) 2008-2011, CERN. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 ******************************************************************************/
// @formatter:on

package org.tensorics.core.util;

import static com.google.common.base.Preconditions.checkNotNull;

import java.lang.reflect.InvocationTargetException;

import com.google.common.reflect.Invokable;

/**
 * Can instantiate a certain type of classes, which expect exactly one argument of a certain type in the constructor.
 * 
 * This class is immutable and thus reusable and thread safe.
 * 
 * @author kfuchsbe
 * @param  the type of the constructor argument
 * @param  the type of the resulting instance
 */
public abstract class SingleArgumentInvokableInstantiator implements Instantiator {

    protected final Class instanceClass;
    private final Invokable invokable;

    public SingleArgumentInvokableInstantiator(Class instanceClass, Class constructorArgumentClass) {
        this.instanceClass = instanceClass;
        this.invokable = invokableFor(constructorArgumentClass);
        this.invokable.setAccessible(true);
    }

    @Override
    public  R create(A1 argument) {
        checkNotNull(argument, "The constructor argument must not be null!");
        try {
            return invokable.invoke(null, argument);
        } catch (IllegalAccessException | //
                IllegalArgumentException | InvocationTargetException e) {
            throw new IllegalArgumentException("Invokable of class '" + instanceClass
                    + "' could not be invoked with argument '" + argument + "'", e);
        }
    }

    protected abstract Invokable invokableFor(Class constructorArgumentClass);

}