io.github.jeddict.orm.generator.compiler.EqualsMethodSnippet Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jeddict
Jeddict is an open source Jakarta EE application development platform that accelerates developers productivity and simplifies development tasks of creating complex entity relationship models.
There is a newer version: 6.5.0
Show newest version
/**
 * Copyright 2013-2022 the original author or authors from the Jeddict project (https://jeddict.github.io/).
 *
 * 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 io.github.jeddict.orm.generator.compiler;

import io.github.jeddict.jpa.spec.DefaultAttribute;
import io.github.jeddict.jpa.spec.Id;
import io.github.jeddict.jpa.spec.IdentifiableClass;
import io.github.jeddict.jpa.spec.extend.Attribute;
import io.github.jeddict.jpa.spec.extend.BaseAttribute;
import io.github.jeddict.jpa.spec.extend.ClassMembers;
import io.github.jeddict.jpa.spec.extend.CompositionAttribute;
import static io.github.jeddict.orm.generator.util.ORMConverterUtil.CLOSE_BRACES;
import static io.github.jeddict.orm.generator.util.ORMConverterUtil.NEW_LINE;
import java.util.Collection;
import static java.util.Collections.singleton;
import static java.util.Objects.nonNull;
import io.github.jeddict.util.StringUtils;

public class EqualsMethodSnippet implements Snippet {

    private final String className;
    private final ClassMembers classMembers;

    public EqualsMethodSnippet(String className, ClassMembers classMembers) {
        this.className = className;
        this.classMembers = classMembers;
    }

    @Override
    public String getSnippet() throws InvalidDataException {
        StringBuilder builder = new StringBuilder();
        builder.append("if (obj == null) {return false;}\n");
        builder.append("        ")
                .append("if (!Objects.equals(getClass(), obj.getClass())) {return false;}\n");
        builder.append("        ")
                .append(String.format("final %s other = (%s) obj;\n", className, className));

        if (StringUtils.isNotBlank(classMembers.getPreCode())) {
            builder.append(classMembers.getPreCode()).append(NEW_LINE);
        }

        for (int i = 0; i < classMembers.getAttributes().size(); i++) {
            Attribute attribute = classMembers.getAttributes().get(i);

            if (attribute instanceof Id) {
                IdentifiableClass identifiableClass = (IdentifiableClass) attribute.getJavaClass();
                if (nonNull(identifiableClass.getAttributes().getEmbeddedId())) {
                    continue;
                }
            }

            if (attribute instanceof DefaultAttribute) {
                attribute = ((DefaultAttribute) attribute).getConnectedAttribute();
            }

            String expression;
            boolean optionalType = attribute.isOptionalReturnType();
            if (attribute instanceof BaseAttribute && !(attribute instanceof CompositionAttribute)) {
                expression = JavaHashcodeEqualsUtil.getEqualExpression(((BaseAttribute) attribute).getAttributeType(), attribute.getName(), optionalType);
            } else {
                expression = JavaHashcodeEqualsUtil.getEqualExpression(attribute.getDataTypeLabel(), attribute.getName(), optionalType);
            }

            builder.append("        ")
                   .append(String.format("if (%s) {", expression));
            builder.append("        ")
                   .append("return false;");
            builder.append("        ")
                   .append(CLOSE_BRACES).append(NEW_LINE);

        }
        if (StringUtils.isNotBlank(classMembers.getPostCode())) {
            builder.append(classMembers.getPostCode()).append(NEW_LINE);
        }
        builder.append("        ")
                   .append("return true;");
        return builder.toString();
    }

    @Override
    public Collection getImportSnippets() throws InvalidDataException {
        return singleton("java.util.Objects");
    }
}