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Spring Data Relational support

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/*
 * Copyright 2019-2023 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.relational.core.sql;

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

import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

/**
 * Default {@link Update} implementation.
 *
 * @author Mark Paluch
 * @since 1.1
 */
class DefaultUpdate implements Update {

	private final Table table;
	private final List assignments;
	private final @Nullable Where where;

	DefaultUpdate(Table table, List assignments, @Nullable Condition where) {
		this.table = table;
		this.assignments = new ArrayList<>(assignments);
		this.where = where != null ? new Where(where) : null;
	}

	@Override
	public void visit(Visitor visitor) {

		Assert.notNull(visitor, "Visitor must not be null");

		visitor.enter(this);

		this.table.visit(visitor);
		this.assignments.forEach(it -> it.visit(visitor));

		if (this.where != null) {
			this.where.visit(visitor);
		}

		visitor.leave(this);
	}

	@Override
	public String toString() {

		StringBuilder builder = new StringBuilder();
		builder.append("UPDATE ").append(table);

		if (!assignments.isEmpty()) {
			builder.append(" SET ").append(StringUtils.collectionToDelimitedString(this.assignments, ", "));
		}

		if (this.where != null) {
			builder.append(" ").append(this.where);
		}

		return builder.toString();
	}
}