1 /*
2 * Copyright 2020-2022 Foreseeti AB <https://foreseeti.com>
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package org.mal_lang.langspec.builders.step;
18
19 import static java.util.Objects.requireNonNull;
20
21 import jakarta.json.JsonObject;
22 import java.util.List;
23 import java.util.Map;
24 import org.mal_lang.langspec.Asset;
25 import org.mal_lang.langspec.builders.AssetBuilder;
26
27 /**
28 * A builder for creating {@link org.mal_lang.langspec.step.StepExpression} objects.
29 *
30 * @since 1.0.0
31 */
32 public abstract class StepExpressionBuilder {
33 /**
34 * Constructs a new {@code StepExpressionBuilder} object.
35 *
36 * @since 1.0.0
37 */
38 protected StepExpressionBuilder() {}
39
40 /**
41 * Returns the target asset of this {@code StepExpressionBuilder}.
42 *
43 * @param sourceAsset the source asset
44 * @param assets all assets of the language
45 * @param assetBuilders all asset builders of the language
46 * @return the target asset of this {@code StepExpressionBuilder}
47 * @since 1.0.0
48 */
49 public abstract Asset getTarget(
50 Asset sourceAsset, Map<String, Asset> assets, List<AssetBuilder> assetBuilders);
51
52 /**
53 * Creates a new {@code StepExpressionBuilder} from a {@link jakarta.json.JsonObject}.
54 *
55 * @param jsonStepExpression the {@link jakarta.json.JsonObject}
56 * @return a new {@code StepExpressionBuilder}
57 * @throws java.lang.NullPointerException if {@code jsonStepExpression} is {@code null}
58 * @since 1.0.0
59 */
60 public static StepExpressionBuilder fromJson(JsonObject jsonStepExpression) {
61 requireNonNull(jsonStepExpression);
62 switch (jsonStepExpression.getString("type")) {
63 case "union":
64 case "intersection":
65 case "difference":
66 case "collect":
67 return StepBinaryOperationBuilder.fromJson(jsonStepExpression);
68 case "transitive":
69 return StepTransitiveBuilder.fromJson(jsonStepExpression);
70 case "subType":
71 return StepSubTypeBuilder.fromJson(jsonStepExpression);
72 case "field":
73 case "attackStep":
74 case "variable":
75 return StepReferenceBuilder.fromJson(jsonStepExpression);
76 default:
77 throw new RuntimeException(
78 String.format(
79 "Invalid step expression type \"%s\"", jsonStepExpression.getString("type")));
80 }
81 }
82 }