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ENH: Add new Semantic Types - SPATIAL.WKT, SPATIAL.GEOJSON (#121)
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types/src/main/java/com/cobber/fta/plugins/SpatialGeoJSON.java
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * Copyright 2017-2024 Tim Segall | ||
| * | ||
| * 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. | ||
| */ | ||
| package com.cobber.fta.plugins; | ||
|
|
||
| import java.io.IOException; | ||
| import java.util.Arrays; | ||
| import java.util.HashSet; | ||
| import java.util.Locale; | ||
| import java.util.Set; | ||
|
|
||
| import com.cobber.fta.AnalysisConfig; | ||
| import com.cobber.fta.AnalyzerContext; | ||
| import com.cobber.fta.Facts; | ||
| import com.cobber.fta.FiniteMap; | ||
| import com.cobber.fta.LogicalTypeInfinite; | ||
| import com.cobber.fta.PluginAnalysis; | ||
| import com.cobber.fta.PluginDefinition; | ||
| import com.cobber.fta.token.TokenStreams; | ||
| import com.fasterxml.jackson.databind.JsonNode; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
|
|
||
| /** | ||
| * Plugin to detect Spatial data in GeoJSON format. | ||
| * See https://en.wikipedia.org/wiki/Well-known_text_representation_of_geometry | ||
| */ | ||
| public class SpatialGeoJSON extends LogicalTypeInfinite { | ||
| /** The Regular Expression for this Semantic type. */ | ||
| public static final String REGEXP = ".*"; | ||
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| private final ObjectMapper mapper = new ObjectMapper(); | ||
|
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| private static final String[] keywords = { | ||
| "POINT", | ||
| "MULTIPOINT", | ||
| "LINESTRING", | ||
| "MULTILINESTRING", | ||
| "POLYGON", | ||
| "MULTIPOLYGON" | ||
| }; | ||
| private Set<String> keywordSet; | ||
| private int minKeywordLength = Integer.MAX_VALUE; | ||
| private int maxKeywordLength = 0; | ||
|
|
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| /** | ||
| * Construct a Spatial plugin based on the Plugin Definition. | ||
| * @param plugin The definition of this plugin. | ||
| */ | ||
| public SpatialGeoJSON(final PluginDefinition plugin) { | ||
| super(plugin); | ||
|
|
||
| for (String keyword : keywords) { | ||
| final int len = keyword.length(); | ||
| if (len < minKeywordLength) | ||
| minKeywordLength = len; | ||
| if (len > maxKeywordLength) | ||
| maxKeywordLength = len; | ||
| } | ||
|
|
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| keywordSet = new HashSet<>(Arrays.asList(keywords)); | ||
| } | ||
|
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| @Override | ||
| public String nextRandom() { | ||
| StringBuilder s = new StringBuilder(); | ||
| s.append("{ \"coordinates\": ["); | ||
| final int points = getRandom().nextInt(8) + 2; | ||
| for (int i = 0; i < points; i++) { | ||
| s.append('['). | ||
| append(getRandom().nextDouble() * 100). | ||
| append(", "). | ||
| append(getRandom().nextDouble() * 100). | ||
| append(']'); | ||
| if (i != points - 1) | ||
| s.append(", "); | ||
| } | ||
|
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| s.append("], \"type\": \"LineString\" }"); | ||
|
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| return s.toString(); | ||
| } | ||
|
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| @Override | ||
| public String getRegExp() { | ||
| return REGEXP; | ||
| } | ||
|
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| @Override | ||
| public boolean isRegExpComplete() { | ||
| return false; | ||
| } | ||
|
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| private boolean check(final String trimmed) { | ||
| String input = trimmed; | ||
| final int len = input.length(); | ||
| if (len < minKeywordLength) | ||
| return false; | ||
|
|
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| char first = input.charAt(0); | ||
| char last = input.charAt(input.length() - 1); | ||
|
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| // If the whole field is quoted - then inspect it without the quotes | ||
| if (first == '"' && last == '"') { | ||
| input = input.substring(1, input.length() - 1); | ||
| first = input.charAt(0); | ||
| last = input.charAt(input.length() - 1); | ||
| } | ||
|
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| // Quick test to see if it might be a JSON structure (note: must see entire JSON field, i.e. not truncated) | ||
| if (first == '{' && last == '}') { | ||
| try { | ||
| JsonNode root = mapper.readTree(input); | ||
| JsonNode typeNode = root.path("type"); | ||
| if (!typeNode.isMissingNode()) { | ||
| JsonNode coordinatesNode = root.path("coordinates"); | ||
| if (coordinatesNode.isMissingNode()) | ||
| return false; | ||
| String shapeType = root.path("type").asText(); | ||
| return keywordSet.contains(shapeType.toUpperCase(Locale.ROOT)); | ||
| } | ||
| } catch (IOException e) { | ||
| return false; | ||
| } | ||
| } | ||
|
|
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| return false; | ||
| } | ||
|
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| @Override | ||
| public boolean isValid(final String input, final boolean detectMode, final long count) { | ||
| return check(input.trim()); | ||
| } | ||
|
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| @Override | ||
| public boolean isCandidate(final String trimmed, final StringBuilder compressed, final int[] charCounts, final int[] lastIndex) { | ||
| if (charCounts['{'] == 0) | ||
| return false; | ||
|
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| return check(trimmed); | ||
| } | ||
|
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| @Override | ||
| public PluginAnalysis analyzeSet(final AnalyzerContext context, final long matchCount, final long realSamples, final String currentRegExp, | ||
| final Facts facts, final FiniteMap cardinality, final FiniteMap outliers, final TokenStreams tokenStreams, final AnalysisConfig analysisConfig) { | ||
| return (double) matchCount / realSamples >= getThreshold() / 100.0 ? PluginAnalysis.OK : PluginAnalysis.SIMPLE_NOT_OK; | ||
| } | ||
| } | ||
|
|
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