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SchemaExtractor.java
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SchemaExtractor.java
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package org.everit.json.schema.loader;
import static java.lang.String.format;
import static java.util.Arrays.asList;
import static java.util.Collections.emptyList;
import static java.util.Collections.singleton;
import static java.util.Collections.singletonList;
import static java.util.Objects.requireNonNull;
import static org.everit.json.schema.loader.SpecificationVersion.DRAFT_4;
import static org.everit.json.schema.loader.SpecificationVersion.DRAFT_7;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import org.everit.json.schema.ArraySchema;
import org.everit.json.schema.BooleanSchema;
import org.everit.json.schema.CombinedSchema;
import org.everit.json.schema.ConditionalSchema;
import org.everit.json.schema.ConstSchema;
import org.everit.json.schema.EnumSchema;
import org.everit.json.schema.NotSchema;
import org.everit.json.schema.NullSchema;
import org.everit.json.schema.NumberSchema;
import org.everit.json.schema.ObjectSchema;
import org.everit.json.schema.Schema;
import org.everit.json.schema.SchemaException;
import org.everit.json.schema.StringSchema;
class KeyConsumer {
private final Set<String> consumedKeys;
private final JsonObject schemaJson;
KeyConsumer(JsonObject schemaJson) {
this.schemaJson = schemaJson;
this.consumedKeys = new HashSet<>(schemaJson.keySet().size());
}
void keyConsumed(String key) {
if (schemaJson.keySet().contains(key)) {
consumedKeys.add(key);
}
}
JsonValue require(String key) {
keyConsumed(key);
return schemaJson.require(key);
}
Optional<JsonValue> maybe(String key) {
keyConsumed(key);
return schemaJson.maybe(key);
}
public Set<String> collect() {
return consumedKeys;
}
}
class ExtractionResult {
final Set<String> consumedKeys;
final Collection<Schema.Builder<?>> extractedSchemas;
ExtractionResult(Set<String> consumedKeys, Collection<Schema.Builder<?>> extractedSchemas) {
this.consumedKeys = requireNonNull(consumedKeys, "consumedKeys cannot be null");
this.extractedSchemas = requireNonNull(extractedSchemas, "extractedSchemas cannot be null");
}
ExtractionResult(String consumedKeys, Collection<Schema.Builder<?>> extactedSchemas) {
this(singleton(consumedKeys), extactedSchemas);
}
}
interface SchemaExtractor {
ExtractionResult extract(JsonObject schemaJson);
}
abstract class AbstractSchemaExtractor implements SchemaExtractor {
static final List<String> NUMBER_SCHEMA_PROPS = asList("minimum", "maximum",
"exclusiveMinimum", "exclusiveMaximum", "multipleOf");
static final List<String> STRING_SCHEMA_PROPS = asList("minLength", "maxLength",
"pattern", "format");
protected JsonObject schemaJson;
private KeyConsumer consumedKeys;
final SchemaLoader defaultLoader;
private ExclusiveLimitHandler exclusiveLimitHandler;
AbstractSchemaExtractor(SchemaLoader defaultLoader) {
this.defaultLoader = requireNonNull(defaultLoader, "defaultLoader cannot be null");
}
@Override
public final ExtractionResult extract(JsonObject schemaJson) {
this.schemaJson = requireNonNull(schemaJson, "schemaJson cannot be null");
this.exclusiveLimitHandler = ExclusiveLimitHandler.ofSpecVersion(config().specVersion);
consumedKeys = new KeyConsumer(schemaJson);
return new ExtractionResult(consumedKeys.collect(), extract());
}
JsonValue require(String key) {
return consumedKeys.require(key);
}
Optional<JsonValue> maybe(String key) {
return consumedKeys.maybe(key);
}
boolean containsKey(String key) {
return schemaJson.containsKey(key);
}
boolean schemaHasAnyOf(Collection<String> propNames) {
return propNames.stream().anyMatch(schemaJson::containsKey);
}
LoaderConfig config() {
return schemaJson.ls.config;
}
ObjectSchema.Builder buildObjectSchema() {
config().specVersion.objectKeywords().forEach(consumedKeys::keyConsumed);
return new ObjectSchemaLoader(schemaJson.ls, config(), defaultLoader).load();
}
ArraySchema.Builder buildArraySchema() {
config().specVersion.arrayKeywords().forEach(consumedKeys::keyConsumed);
return new ArraySchemaLoader(schemaJson.ls, config(), defaultLoader).load();
}
NumberSchema.Builder buildNumberSchema() {
PropertySnifferSchemaExtractor.NUMBER_SCHEMA_PROPS.forEach(consumedKeys::keyConsumed);
NumberSchema.Builder builder = NumberSchema.builder();
maybe("minimum").map(JsonValue::requireNumber).ifPresent(builder::minimum);
maybe("maximum").map(JsonValue::requireNumber).ifPresent(builder::maximum);
maybe("multipleOf").map(JsonValue::requireNumber).ifPresent(multipleOf -> {
if (BigDecimal.ZERO.compareTo(BigDecimal.valueOf(multipleOf.doubleValue())) == 0) {
throw new SchemaException(schemaJson.ls.locationOfCurrentObj(), "multipleOf should not be 0");
}
builder.multipleOf(multipleOf);
});
maybe("exclusiveMinimum").ifPresent(exclMin -> exclusiveLimitHandler.handleExclusiveMinimum(exclMin, builder));
maybe("exclusiveMaximum").ifPresent(exclMax -> exclusiveLimitHandler.handleExclusiveMaximum(exclMax, builder));
return builder;
}
StringSchema.Builder buildStringSchema() {
PropertySnifferSchemaExtractor.STRING_SCHEMA_PROPS.forEach(consumedKeys::keyConsumed);
return new StringSchemaLoader(schemaJson.ls, config().formatValidators).load();
}
abstract List<Schema.Builder<?>> extract();
}
class EnumSchemaExtractor extends AbstractSchemaExtractor {
EnumSchemaExtractor(SchemaLoader defaultLoader) {
super(defaultLoader);
}
@Override List<Schema.Builder<?>> extract() {
if (!containsKey("enum")) {
return emptyList();
}
EnumSchema.Builder builder = EnumSchema.builder();
List<Object> possibleValues = new ArrayList<>();
require("enum").requireArray().forEach((i, item) -> possibleValues.add(item.unwrap()));
builder.possibleValues(possibleValues);
return singletonList(builder);
}
}
class ReferenceSchemaExtractor extends AbstractSchemaExtractor {
ReferenceSchemaExtractor(SchemaLoader defaultLoader) {
super(defaultLoader);
}
@Override List<Schema.Builder<?>> extract() {
if (containsKey("$ref")) {
String ref = require("$ref").requireString();
return singletonList(new ReferenceLookup(schemaJson.ls).lookup(ref, schemaJson));
}
return emptyList();
}
}
class PropertySnifferSchemaExtractor extends AbstractSchemaExtractor {
static final List<String> CONDITIONAL_SCHEMA_KEYWORDS = asList("if", "then", "else");
PropertySnifferSchemaExtractor(SchemaLoader defaultLoader) {
super(defaultLoader);
}
@Override List<Schema.Builder<?>> extract() {
List<Schema.Builder<?>> builders = new ArrayList<>(1);
if (schemaHasAnyOf(config().specVersion.arrayKeywords())) {
builders.add(buildArraySchema().requiresArray(false));
}
if (schemaHasAnyOf(config().specVersion.objectKeywords())) {
builders.add(buildObjectSchema().requiresObject(false));
}
if (schemaHasAnyOf(NUMBER_SCHEMA_PROPS)) {
builders.add(buildNumberSchema().requiresNumber(false));
}
if (schemaHasAnyOf(STRING_SCHEMA_PROPS)) {
builders.add(buildStringSchema().requiresString(false));
}
if (config().specVersion.isAtLeast(DRAFT_7) && schemaHasAnyOf(CONDITIONAL_SCHEMA_KEYWORDS)) {
builders.add(buildConditionalSchema());
}
return builders;
}
private ConditionalSchema.Builder buildConditionalSchema() {
ConditionalSchema.Builder builder = ConditionalSchema.builder();
maybe("if").map(defaultLoader::loadChild).map(Schema.Builder::build).ifPresent(builder::ifSchema);
maybe("then").map(defaultLoader::loadChild).map(Schema.Builder::build).ifPresent(builder::thenSchema);
maybe("else").map(defaultLoader::loadChild).map(Schema.Builder::build).ifPresent(builder::elseSchema);
return builder;
}
}
class TypeBasedSchemaExtractor extends AbstractSchemaExtractor {
TypeBasedSchemaExtractor(SchemaLoader defaultLoader) {
super(defaultLoader);
}
@Override List<Schema.Builder<?>> extract() {
if (containsKey("type")) {
return singletonList(require("type").canBeMappedTo(JsonArray.class, arr -> (Schema.Builder) buildAnyOfSchemaForMultipleTypes())
.orMappedTo(String.class, this::loadForExplicitType)
.requireAny());
} else {
return emptyList();
}
}
private CombinedSchema.Builder buildAnyOfSchemaForMultipleTypes() {
JsonArray subtypeJsons = require("type").requireArray();
Collection<Schema> subschemas = new ArrayList<>(subtypeJsons.length());
subtypeJsons.forEach((j, raw) -> {
subschemas.add(loadForExplicitType(raw.requireString()).build());
});
return CombinedSchema.anyOf(subschemas);
}
private Schema.Builder<?> loadForExplicitType(String typeString) {
switch (typeString) {
case "string":
return buildStringSchema().requiresString(true);
case "integer":
return buildNumberSchema().requiresInteger(true);
case "number":
return buildNumberSchema();
case "boolean":
return BooleanSchema.builder();
case "null":
return NullSchema.builder();
case "array":
return buildArraySchema();
case "object":
return buildObjectSchema();
default:
throw new SchemaException(schemaJson.ls.locationOfCurrentObj(), format("unknown type: [%s]", typeString));
}
}
}
class NotSchemaExtractor extends AbstractSchemaExtractor {
NotSchemaExtractor(SchemaLoader defaultLoader) {
super(defaultLoader);
}
@Override List<Schema.Builder<?>> extract() {
if (containsKey("not")) {
Schema mustNotMatch = defaultLoader.loadChild(require("not")).build();
return singletonList(NotSchema.builder().mustNotMatch(mustNotMatch));
}
return emptyList();
}
}
class ConstSchemaExtractor extends AbstractSchemaExtractor {
ConstSchemaExtractor(SchemaLoader defaultLoader) {
super(defaultLoader);
}
@Override List<Schema.Builder<?>> extract() {
if (config().specVersion != DRAFT_4 && containsKey("const")) {
return singletonList(ConstSchema.builder().permittedValue(require("const").unwrap()));
} else {
return emptyList();
}
}
}