| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
| NaryExpression |
|
| 1.25;1.25 |
| 1 | /* | |
| 2 | * #%L | |
| 3 | * NaryExpression.java - mongodb-async-driver - Allanbank Consulting, Inc. | |
| 4 | * %% | |
| 5 | * Copyright (C) 2011 - 2014 Allanbank Consulting, Inc. | |
| 6 | * %% | |
| 7 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
| 8 | * you may not use this file except in compliance with the License. | |
| 9 | * You may obtain a copy of the License at | |
| 10 | * | |
| 11 | * http://www.apache.org/licenses/LICENSE-2.0 | |
| 12 | * | |
| 13 | * Unless required by applicable law or agreed to in writing, software | |
| 14 | * distributed under the License is distributed on an "AS IS" BASIS, | |
| 15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 16 | * See the License for the specific language governing permissions and | |
| 17 | * limitations under the License. | |
| 18 | * #L% | |
| 19 | */ | |
| 20 | package com.allanbank.mongodb.builder.expression; | |
| 21 | ||
| 22 | import java.io.StringWriter; | |
| 23 | import java.util.ArrayList; | |
| 24 | import java.util.List; | |
| 25 | ||
| 26 | import com.allanbank.mongodb.bson.Element; | |
| 27 | import com.allanbank.mongodb.bson.ElementAssignable; | |
| 28 | import com.allanbank.mongodb.bson.element.ArrayElement; | |
| 29 | import com.allanbank.mongodb.bson.element.DocumentElement; | |
| 30 | import com.allanbank.mongodb.bson.element.JsonSerializationVisitor; | |
| 31 | ||
| 32 | /** | |
| 33 | * NaryExpression provides an implementation of an {@link Expression} with 2-N | |
| 34 | * operands. | |
| 35 | * | |
| 36 | * @api.no This class is <b>NOT</b> part of the drivers API. This class may be | |
| 37 | * mutated in incompatible ways between any two releases of the driver. | |
| 38 | * @copyright 2012-2013, Allanbank Consulting, Inc., All Rights Reserved | |
| 39 | */ | |
| 40 | 7 | public class NaryExpression implements Expression, ElementAssignable { |
| 41 | ||
| 42 | /** The expression expressed as an {@link ArrayElement}. */ | |
| 43 | protected final ArrayElement myExpressions; | |
| 44 | ||
| 45 | /** | |
| 46 | * Creates a new NaryExpression. | |
| 47 | * | |
| 48 | * @param operator | |
| 49 | * The operator this object represents. | |
| 50 | * @param expressions | |
| 51 | * The sub expressions. | |
| 52 | */ | |
| 53 | public NaryExpression(final String operator, | |
| 54 | 32 | final Expression... expressions) { |
| 55 | 32 | final List<Element> elements = new ArrayList<Element>( |
| 56 | expressions.length); | |
| 57 | 102 | for (int i = 0; i < expressions.length; ++i) { |
| 58 | 70 | elements.add(expressions[i].toElement(String.valueOf(i))); |
| 59 | } | |
| 60 | ||
| 61 | 32 | myExpressions = new ArrayElement(operator, elements); |
| 62 | 32 | } |
| 63 | ||
| 64 | /** | |
| 65 | * {@inheritDoc} | |
| 66 | * <p> | |
| 67 | * Overridden to return the sub expressions as a {@link ArrayElement}: | |
| 68 | * </p> | |
| 69 | * <blockquote> | |
| 70 | * | |
| 71 | * <pre> | |
| 72 | * <code> | |
| 73 | * "$op" : [ <e1>, <e2>, <e2>, ... ] | |
| 74 | * </code> | |
| 75 | * </pre> | |
| 76 | * | |
| 77 | * </blockquote> | |
| 78 | */ | |
| 79 | @Override | |
| 80 | public ArrayElement asElement() { | |
| 81 | 19 | return myExpressions; |
| 82 | } | |
| 83 | ||
| 84 | /** | |
| 85 | * {@inheritDoc} | |
| 86 | * <p> | |
| 87 | * Overridden to return the sub expressions as a document with a nested | |
| 88 | * array element: | |
| 89 | * </p> | |
| 90 | * <blockquote> | |
| 91 | * | |
| 92 | * <pre> | |
| 93 | * <code> | |
| 94 | * { <name> : { "$op" : [ <e1>, <e2>, <e2>, ... ] } } | |
| 95 | * </code> | |
| 96 | * </pre> | |
| 97 | * | |
| 98 | * </blockquote> | |
| 99 | */ | |
| 100 | @Override | |
| 101 | public DocumentElement toElement(final String name) { | |
| 102 | 32 | return new DocumentElement(name, myExpressions); |
| 103 | } | |
| 104 | ||
| 105 | /** | |
| 106 | * {@inheritDoc} | |
| 107 | * <p> | |
| 108 | * Overridden to return the expression in JSON format. | |
| 109 | * </p> | |
| 110 | * <blockquote> | |
| 111 | * | |
| 112 | * <pre> | |
| 113 | * <code> | |
| 114 | * "$op" : [ <e1>, <e2>, <e2>, ... ] | |
| 115 | * </code> | |
| 116 | * </pre> | |
| 117 | * | |
| 118 | * </blockquote> | |
| 119 | */ | |
| 120 | @Override | |
| 121 | public String toString() { | |
| 122 | 1 | final StringWriter sink = new StringWriter(); |
| 123 | 1 | final JsonSerializationVisitor json = new JsonSerializationVisitor( |
| 124 | sink, true); | |
| 125 | ||
| 126 | 1 | myExpressions.accept(json); |
| 127 | ||
| 128 | 1 | return sink.toString(); |
| 129 | } | |
| 130 | } |