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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
 /*******************************************************************************
 *
 * 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.tree.walking;

import org.tensorics.core.tree.domain.Node;

/**
 * This exception is thrown, if a path is searched from a child node to a parent node, but none can be found.
 * 
 * @author kfuchsbe
 */
public class PathDoesNotExistException extends RuntimeException {

    private static final long serialVersionUID = 1L;

    public PathDoesNotExistException(Node childNode, Node ancestorNode) {
        super("The path between child '" + childNode + "' to ancestor '" + ancestorNode + "' contains no elements."
                + " This means no path could be found."
                + " Maybe the given child is nowhere in the tree of the ancestor?");
    }

}