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A json schema validator that supports draft v4, v6, v7, v2019-09 and v2020-12
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package com.networknt.schema;

import com.fasterxml.jackson.databind.JsonNode;

import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * {@link JsonValidator} for {@literal maxContains} and {@literal minContains} in a schema.
 * 
 * This validator only checks that the schema is valid. The functionality for
 * testing whether an instance array conforms to the {@literal maxContains}
 * and {@literal minContains} constraints exists within {@code ContainsValidator}.
 */
public class MinMaxContainsValidator extends BaseJsonValidator {
    private final Set analysis;

    public MinMaxContainsValidator(SchemaLocation schemaLocation, JsonNodePath evaluationPath, JsonNode schemaNode, JsonSchema parentSchema,
            ValidationContext validationContext) {
        super(schemaLocation, evaluationPath, schemaNode, parentSchema, ValidatorTypeCode.MAX_CONTAINS, validationContext);

        Set analysis = null;
        int min = 1;
        int max = Integer.MAX_VALUE;

        JsonNode minNode = parentSchema.getSchemaNode().get("minContains");
        if (null != minNode) {
            if (!minNode.isNumber() || !minNode.canConvertToExactIntegral() || minNode.intValue() < 0) {
                if (analysis == null) {
                    analysis = new LinkedHashSet<>();
                }
                analysis.add(new Analysis("minContains", schemaLocation));
            } else {
                min = minNode.intValue();
            }
        }

        JsonNode maxNode = parentSchema.getSchemaNode().get("maxContains");
        if (null != maxNode) {
            if (!maxNode.isNumber() || !maxNode.canConvertToExactIntegral() || maxNode.intValue() < 0) {
                if (analysis == null) {
                    analysis = new LinkedHashSet<>();
                }
                analysis.add(new Analysis("maxContains", schemaLocation));
            } else {
                max = maxNode.intValue();
            }
        }

        if (max < min) {
            if (analysis == null) {
                analysis = new LinkedHashSet<>();
            }
            analysis.add(new Analysis("minContainsVsMaxContains", schemaLocation));
        }
        this.analysis = analysis;
    }

    @Override
    public Set validate(ExecutionContext executionContext, JsonNode node, JsonNode rootNode,
            JsonNodePath instanceLocation) {
        return this.analysis != null ? this.analysis.stream()
                .map(analysis -> message().instanceNode(node)
                        .instanceLocation(instanceLocation)
                        .messageKey(analysis.getMessageKey()).locale(executionContext.getExecutionConfig().getLocale())
                        .failFast(executionContext.isFailFast())
                        .type(analysis.getMessageKey())
                        .arguments(parentSchema.getSchemaNode().toString()).build())
                .collect(Collectors.toCollection(LinkedHashSet::new)) : Collections.emptySet();
    }
    
    public static class Analysis {
        public String getMessageKey() {
            return messageKey;
        }

        public SchemaLocation getSchemaLocation() {
            return schemaLocation;
        }

        private final String messageKey;
        private final SchemaLocation schemaLocation;

        public Analysis(String messageKey, SchemaLocation schemaLocation) {
            super();
            this.messageKey = messageKey;
            this.schemaLocation = schemaLocation;
        }
    }
}