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

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/*
 * Copyright (c) 2024 the original author or authors.
 *
 * 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.networknt.schema.resource;

import java.util.ArrayList;
import java.util.List;

import com.networknt.schema.AbsoluteIri;

/**
 * Default {@link SchemaLoader}.
 */
public class DefaultSchemaLoader implements SchemaLoader {
    private static final List DEFAULT;
    private static final MetaSchemaMapper META_SCHEMA_MAPPER = new MetaSchemaMapper();

    static {
        List result = new ArrayList<>();
        result.add(new ClasspathSchemaLoader());
        result.add(new UriSchemaLoader());
        DEFAULT = result;
    }

    private final List schemaLoaders;
    private final List schemaMappers;

    public DefaultSchemaLoader(List schemaLoaders, List schemaMappers) {
        this.schemaLoaders = schemaLoaders;
        this.schemaMappers = schemaMappers;
    }

    @Override
    public InputStreamSource getSchema(AbsoluteIri absoluteIri) {
        AbsoluteIri mappedResult = absoluteIri;
        for (SchemaMapper mapper : schemaMappers) {
            AbsoluteIri mapped = mapper.map(mappedResult);
            if (mapped != null) {
                mappedResult = mapped;
            }
        }
        AbsoluteIri mapped = META_SCHEMA_MAPPER.map(absoluteIri);
        if (mapped != null) {
            mappedResult = mapped;
        }
        for (SchemaLoader loader : schemaLoaders) {
            InputStreamSource result = loader.getSchema(mappedResult);
            if (result != null) {
                return result;
            }
        }
        for (SchemaLoader loader : DEFAULT) {
            InputStreamSource result = loader.getSchema(mappedResult);
            if (result != null) {
                return result;
            }
        }
        return null;
    }

}