all files / src/ast/ SpelNode.js

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/*
 * Copyright 2002-2015 the original author or authors.
 *
 * 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.
 */
 
/**
 * The common supertype of all AST nodes in a parsed Spring Expression Language
 * format expression.
 *
 * @author Andy Clement
 * @author Ben March
 * @since 0.2.0
 */
 
function createSpelNode(nodeType, position, ...operands) {
  var node = {},
    type = nodeType || 'Abstract',
    children = [],
    parent = null,
    activeContext;
 
  node._type = type;
 
  node.getType = function () {
    return type;
  };
  node.setType = function (nodeType) {
    type = nodeType;
  };
 
  node.getChildren = function () {
    return children;
  };
  node.addChild = function (childNode) {
    childNode.setParent(node);
    children.push(childNode);
  };
 
  node.getParent = function () {
    return parent;
  };
  node.setParent = function (parentNode) {
    parent = parentNode;
  };
 
  node.getContext = function (state) {
    return activeContext || state.activeContext.peek();
  };
  node.setContext = function (nodeContext) {
    activeContext = nodeContext;
  };
 
  node.getStartPosition = function () {
    return position >> 16;
  };
 
  node.getEndPosition = function () {
    return position & 0xffff;
  };
 
  //must override
  node.getValue = function () {
    throw {
      name: 'MethodNotImplementedException',
      message: 'SpelNode#getValue() must be overridden.',
    };
  };
 
  node.toString = function () {
    var s = 'Kind: ' + node.getType();
    //s += ', Value: ' + node.getValue();
    s += ', Children: [';
    for (var i = 0, l = node.getChildren().length; i < l; i += 1) {
      s += '{' + node.getChildren()[i] + '}, ';
    }
    s += ']';
    return s;
  };
 
  //constructor
  if (Iposition === 0) {
    throw {
      name: 'Error',
      message: 'Position cannot be 0',
    };
  }
 
  if (Eoperands) {
    operands.forEach(function (operand) {
      node.addChild(operand);
    });
  }
 
  return node;
}
 
export var SpelNode = {
  create: createSpelNode,
};