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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.domain;

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

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

/**
 * Describes the situation that at some point in the expression tree an exception occured which probably should be
 * handled. It contains the information about
 * 
 * the root node of the tree
 * 
the node, where the exception occures
 * 
the eception itself
 * 
and the context, which should be modified as soon as the exception will be handled
 * 
 * 
 * This class is immutable
 * 
 * @author kfuchsbe
 */
public final class ExceptionHandlingRequest {
    private final Node rootNode;
    private final Node throwingNode;
    private final RuntimeException exception;
    private final EditableResolvingContext context;

    public ExceptionHandlingRequest(Builder builder) {
        this.rootNode = checkNotNull(builder.rootNode, "rootNode must not be null");
        this.throwingNode = checkNotNull(builder.throwingNode, "throwingNode must not be null");
        this.exception = checkNotNull(builder.exception, "exception must not be null");
        this.context = checkNotNull(builder.context, "context must not be null");
    }

    public static Builder builder() {
        return new Builder();
    }

    public Node getRootNode() {
        return rootNode;
    }

    public RuntimeException getException() {
        return exception;
    }

    public EditableResolvingContext getContext() {
        return context;
    }

    public Node getThrowingNode() {
        return throwingNode;
    }

    /**
     * The builder for an exception handling request.
     * 
     * This class is not threadsafe.
     * 
     * @author kfuchsbe
     */
    public static class Builder {
        private Node rootNode;
        private Node throwingNode;
        private RuntimeException exception;
        private EditableResolvingContext context;

        Builder() {
            /* Avoid public instantiation */
        }

        public Builder withRoot(Node newRootNode) {
            this.rootNode = newRootNode;
            return this;
        }

        public Builder withThrowingNode(Node newThrowingNode) {
            this.throwingNode = newThrowingNode;
            return this;
        }

        public Builder withException(RuntimeException newException) {
            this.exception = newException;
            return this;
        }

        public Builder withContext(EditableResolvingContext newContext) {
            this.context = newContext;
            return this;
        }

        public ExceptionHandlingRequest build() {
            return new ExceptionHandlingRequest(this);
        }

    }
}