ColumnListGenerator.java

/*
 *    Copyright 2006-2026 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.mybatis.generator.runtime.dynamicsql.kotlin.elements;

import java.util.HashSet;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;

import org.jspecify.annotations.Nullable;
import org.mybatis.generator.api.IntrospectedColumn;
import org.mybatis.generator.api.dom.kotlin.KotlinFile;
import org.mybatis.generator.api.dom.kotlin.KotlinModifier;
import org.mybatis.generator.api.dom.kotlin.KotlinProperty;
import org.mybatis.generator.codegen.AbstractGenerator;
import org.mybatis.generator.runtime.dynamicsql.kotlin.elements.KotlinFragmentGenerator.FieldNameAndImport;

public class ColumnListGenerator extends AbstractGenerator {

    private final String supportObjectImport;
    private final String tableFieldName;
    private final KotlinFragmentGenerator fragmentGenerator;

    private ColumnListGenerator(Builder builder) {
        super(builder);
        supportObjectImport = Objects.requireNonNull(builder.supportObjectImport);
        tableFieldName = Objects.requireNonNull(builder.tableFieldName);
        fragmentGenerator = Objects.requireNonNull(builder.fragmentGenerator);
    }

    public KotlinPropertyAndImports generatePropertyAndImports() {
        List<FieldNameAndImport> fieldsAndImports = introspectedTable.getAllColumns().stream()
                .map(this::calculateFieldAndImport)
                .toList();

        KotlinProperty property = KotlinProperty.newVal("columnList") //$NON-NLS-1$
                .withModifier(KotlinModifier.PRIVATE)
                .withInitializationString(getInitializationString(fieldsAndImports))
                .build();

        Set<String> imports = new HashSet<>();

        commentGenerator.addGeneralPropertyComment(property, introspectedTable, imports);

        return KotlinPropertyAndImports.withProperty(property)
                .withImports(imports)
                .withImports(getImports(fieldsAndImports))
                .build();
    }

    private FieldNameAndImport calculateFieldAndImport(IntrospectedColumn column) {
        return fragmentGenerator.calculateFieldNameAndImport(tableFieldName, supportObjectImport, column);
    }

    private String getInitializationString(List<FieldNameAndImport> fieldsAndImports) {
        return fieldsAndImports.stream()
                .map(FieldNameAndImport::fieldName)
                .collect(Collectors.joining(", ", "listOf(", ")")); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
    }

    private Set<String> getImports(List<FieldNameAndImport> fieldsAndImports) {
        return fieldsAndImports.stream()
                .map(FieldNameAndImport::importString)
                .collect(Collectors.toSet());
    }

    public boolean callPlugins(KotlinProperty kotlinProperty, KotlinFile kotlinFile) {
        return pluginAggregator.clientColumnListPropertyGenerated(kotlinProperty, kotlinFile, introspectedTable);
    }

    public static class Builder extends AbstractGeneratorBuilder<Builder> {
        private @Nullable String supportObjectImport;
        private @Nullable String tableFieldName;
        private @Nullable KotlinFragmentGenerator fragmentGenerator;

        public Builder withSupportObjectImport(String supportObjectImport) {
            this.supportObjectImport = supportObjectImport;
            return this;
        }

        public Builder withTableFieldName(String tableFieldName) {
            this.tableFieldName = tableFieldName;
            return this;
        }

        public Builder withFragmentGenerator(KotlinFragmentGenerator fragmentGenerator) {
            this.fragmentGenerator = fragmentGenerator;
            return this;
        }

        public ColumnListGenerator build() {
            return new ColumnListGenerator(this);
        }

        @Override
        protected Builder getThis() {
            return this;
        }
    }
}