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| 1 | +package no.ssb.vtl.model; |
| 2 | + |
| 3 | +/*- |
| 4 | + * ========================LICENSE_START================================= |
| 5 | + * Java VTL |
| 6 | + * %% |
| 7 | + * Copyright (C) 2016 - 2017 Hadrien Kohl |
| 8 | + * %% |
| 9 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 10 | + * you may not use this file except in compliance with the License. |
| 11 | + * You may obtain a copy of the License at |
| 12 | + * |
| 13 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 14 | + * |
| 15 | + * Unless required by applicable law or agreed to in writing, software |
| 16 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 17 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 18 | + * See the License for the specific language governing permissions and |
| 19 | + * limitations under the License. |
| 20 | + * =========================LICENSE_END================================== |
| 21 | + */ |
| 22 | + |
| 23 | +import com.google.common.collect.ImmutableMap; |
| 24 | + |
| 25 | +import java.util.Map; |
| 26 | + |
| 27 | +/** |
| 28 | + * Represents a VTL Function. |
| 29 | + */ |
| 30 | +public abstract class VTLFunction extends VTLExpression { |
| 31 | + |
| 32 | + private final Map<String, VTLExpression> context; |
| 33 | + |
| 34 | + protected VTLFunction(Map<String, VTLExpression> context) { |
| 35 | + this.context = context; |
| 36 | + } |
| 37 | + |
| 38 | + public static Builder create(Class<? extends VTLObject> returnType) { |
| 39 | + return new Builder(returnType); |
| 40 | + } |
| 41 | + |
| 42 | + @Override |
| 43 | + public Class<? extends VTLObject> getType() { |
| 44 | + return null; |
| 45 | + } |
| 46 | + |
| 47 | + @FunctionalInterface |
| 48 | + interface Body { |
| 49 | + VTLObject execute(); |
| 50 | + } |
| 51 | + |
| 52 | + /** |
| 53 | + * Builder for VTLFunction. |
| 54 | + */ |
| 55 | + private static class Builder { |
| 56 | + |
| 57 | + private final Class<? extends VTLObject> type; |
| 58 | + ImmutableMap.Builder<String, Class<? extends VTLObject>> signature; |
| 59 | + ImmutableMap.Builder<String, VTLObject> defaultValues; |
| 60 | + |
| 61 | + private Builder(Class<? extends VTLObject> type) { |
| 62 | + this.type = type; |
| 63 | + } |
| 64 | + |
| 65 | + public Builder withArgument(String name, Class<? extends VTLObject> type) { |
| 66 | + signature.put(name, type); |
| 67 | + return this; |
| 68 | + } |
| 69 | + |
| 70 | + public Builder withArgument(String name, VTLObject defaultValue) { |
| 71 | + defaultValues.put(name, defaultValue); |
| 72 | + return withArgument(name, defaultValue.getClass()); |
| 73 | + } |
| 74 | + |
| 75 | + public VTLFunction build(Map<String, VTLExpression> context) { |
| 76 | + throw new UnsupportedOperationException("TODO"); |
| 77 | + } |
| 78 | + } |
| 79 | +} |
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