org.springframework.data.solr.core.schema.SolrSchemaWriter.java Source code

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Here is the source code for org.springframework.data.solr.core.schema.SolrSchemaWriter.java

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/*
 * Copyright 2014-2019 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
 *
 *      https://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 org.springframework.data.solr.core.schema;

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

import org.springframework.data.solr.core.SolrTemplate;
import org.springframework.data.solr.core.schema.SchemaDefinition.FieldDefinition;
import org.springframework.data.solr.server.SolrClientFactory;
import org.springframework.util.CollectionUtils;

/**
 * @author Christoph Strobl
 * @since 1.3
 */
public class SolrSchemaWriter {

    private final SolrTemplate template;

    public SolrSchemaWriter(SolrClientFactory factory) {
        this.template = new SolrTemplate(factory);
    }

    public void writeSchema(SchemaDefinition schemaDefinition) {

        if (isSchemaPresent(schemaDefinition.getCollectionName())) {
            updateSchema(schemaDefinition);
            return;
        }

        createSchema(schemaDefinition);
    }

    protected void createSchema(SchemaDefinition schemaDefinition) {
        throw new UnsupportedOperationException("The solr rest API does not allow schema creation.");
    }

    protected void updateSchema(SchemaDefinition schemaDefinition) {

        SchemaDefinition existing = loadExistingSchema(schemaDefinition.getCollectionName());

        List<FieldDefinition> fieldsToBeCreated = new ArrayList<>();
        for (FieldDefinition fieldDefinition : schemaDefinition.getFields()) {

            if (!existing.containsField(fieldDefinition.getName()))
                fieldsToBeCreated.add(fieldDefinition);
        }

        writeFieldDefinitions(fieldsToBeCreated, schemaDefinition.getCollectionName());
    }

    private void writeFieldDefinitions(Collection<FieldDefinition> definitions, String collectionName) {

        if (!CollectionUtils.isEmpty(definitions)) {

            SchemaOperations schemaOps = template.getSchemaOperations(collectionName);
            for (FieldDefinition fd : definitions) {
                schemaOps.addField(fd);
            }
        }
    }

    boolean isSchemaPresent(String collectionName) {
        return !retrieveSchemaVersion(collectionName).isNaN();
    }

    SchemaDefinition loadExistingSchema(String collectionName) {
        return template.getSchemaOperations(collectionName).readSchema();
    }

    Double retrieveSchemaVersion(String collectionName) {
        return template.getSchemaOperations(collectionName).getSchemaVersion();
    }

}