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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.
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// @formatter:on

package org.tensorics.incubate.function;

import javax.measure.quantity.Quantity;

import org.jscience.physics.amount.Amount;
import org.tensorics.core.tensor.Tensor;

import com.google.common.base.Preconditions;

/**
 * @author agorzaws
 * @param  type of arguments
 * @param  type of values
 */
public final class ConstantFunction implements
        AnalyticalFunction, Amount> {

    private final Amount constant;

    private ConstantFunction(Amount constant) {
        this.constant = constant;
        Preconditions.checkArgument(constant != null, "Argument '" + "constant" + "' must not be null!");
    }

    @Override
    public Amount getY(Amount xValue) {
        return constant;
    }

    @Override
    public String toText() {
        return "[y = A]";
    }

    public Tensor> tensor() {
        throw new UnsupportedOperationException("Cannot get a discrete tensor from analytical function");
    }

    public Amount getConstant() {
        return constant;
    }

    @SuppressWarnings("PMD.ShortMethodName")
    public static  ConstantFunction of(Amount amount) {
        return new ConstantFunction(amount);
    }

}