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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.resolve.options;

import java.util.Set;

import org.tensorics.core.resolve.domain.ExceptionHandlingRequest;
import org.tensorics.core.resolve.domain.ResolvingException;
import org.tensorics.core.tree.domain.EditableResolvingContext;
import org.tensorics.core.tree.domain.ExceptionHandlingNode;
import org.tensorics.core.tree.walking.Trees;

import com.google.common.reflect.TypeToken;

/**
 * When this strategy is used in the dispatcher, then the exceptions which appear at some node, are handled in the first
 * node above which can handle the exception. This handling node is then resolved to an appropriate result and the tree
 * below is not processed further.
 * 
 * @author kfuchsbe
 */
public class HandleWithFirstCapableAncestorStrategy extends AbstractExceptionHandlingStrategy {

    /**
     * Checks to see if there are nodes to handle each exception that occured during the processing. If not a
     * {@link ResolvingException} is thrown.
     */
    @Override
    public void handleWithRootNodeFailingNodeException(ExceptionHandlingRequest parameterObject) {
        Set> handlingNodes = Trees.findClosestAncestorNodeFromNodesToRootOfType(
                parameterObject.getThrowingNode(), parameterObject.getRootNode(),
                new TypeToken>() {
                    private static final long serialVersionUID = 1L;
                });

        if (handlingNodes.isEmpty()) {
            throw new ResolvingException(
                    "No node could be found to handle exception which occured during the processing of node '"
                            + parameterObject.getThrowingNode() + "'.", parameterObject.getException());
        }
        for (ExceptionHandlingNode handlingNode : handlingNodes) {
            putHandled(parameterObject.getException(), handlingNode, parameterObject.getContext());
        }
    }

    private  void putHandled(RuntimeException exception, ExceptionHandlingNode handlingNode,
            EditableResolvingContext context) {
        R handledErrorResult = handlingNode.handle(exception);
        context.put(handlingNode, handledErrorResult);
    }

}