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A json schema validator that supports draft v4, v6, v7, v2019-09 and v2020-12

The newest version!

package com.networknt.schema;

import java.util.Arrays;

/**
 * Draft 4 dialect.
 */
public class Version4 implements JsonSchemaVersion {
    private static final String IRI = SchemaId.V4;
    private static final String ID = "id";
    
    private static class Holder {
        private static final JsonMetaSchema INSTANCE;
        static {
            INSTANCE = JsonMetaSchema.builder(IRI)
                    .specification(SpecVersion.VersionFlag.V4)
                    .idKeyword(ID)
                    .formats(Formats.DEFAULT)
                    .keywords(ValidatorTypeCode.getKeywords(SpecVersion.VersionFlag.V4))
                    // keywords that may validly exist, but have no validation aspect to them
                    .keywords(Arrays.asList(
                            new NonValidationKeyword("$schema"),
                            new NonValidationKeyword("id"),
                            new AnnotationKeyword("title"),
                            new AnnotationKeyword("description"),
                            new AnnotationKeyword("default"),
                            new NonValidationKeyword("definitions"),
                            new NonValidationKeyword("additionalItems"),
                            new AnnotationKeyword("exampleSetFlag"),
                            new NonValidationKeyword("exclusiveMinimum"), // exclusiveMinimum boolean handled by minimum validator
                            new NonValidationKeyword("exclusiveMaximum")  // exclusiveMaximum boolean handled by maximum validator
                    ))
                    .build(); 
        }
    }

    public JsonMetaSchema getInstance() {
        return Holder.INSTANCE;
    }
}