001// --------------------------------------------------------------------------------
002// Copyright 2002-2026 Echo Three, LLC
003//
004// Licensed under the Apache License, Version 2.0 (the "License");
005// you may not use this file except in compliance with the License.
006// You may obtain a copy of the License at
007//
008//     http://www.apache.org/licenses/LICENSE-2.0
009//
010// Unless required by applicable law or agreed to in writing, software
011// distributed under the License is distributed on an "AS IS" BASIS,
012// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013// See the License for the specific language governing permissions and
014// limitations under the License.
015// --------------------------------------------------------------------------------
016
017package com.echothree.control.user.party.server.command;
018
019import com.echothree.control.user.party.common.form.GetLanguageForm;
020import com.echothree.control.user.party.common.result.PartyResultFactory;
021import com.echothree.model.control.core.common.ComponentVendors;
022import com.echothree.model.control.core.common.EntityTypes;
023import com.echothree.model.control.core.common.EventTypes;
024import com.echothree.model.control.core.server.logic.EntityInstanceLogic;
025import com.echothree.model.control.party.server.control.PartyControl;
026import com.echothree.model.control.party.server.logic.LanguageLogic;
027import com.echothree.model.data.party.server.entity.Language;
028import com.echothree.model.data.user.common.pk.UserVisitPK;
029import com.echothree.util.common.message.ExecutionErrors;
030import com.echothree.util.common.validation.FieldDefinition;
031import com.echothree.util.common.validation.FieldType;
032import com.echothree.util.common.command.BaseResult;
033import com.echothree.util.server.control.BaseSingleEntityCommand;
034import java.util.List;
035import javax.enterprise.context.Dependent;
036import javax.inject.Inject;
037
038@Dependent
039public class GetLanguageCommand
040        extends BaseSingleEntityCommand<Language, GetLanguageForm> {
041    
042    // No COMMAND_SECURITY_DEFINITION, anyone may execute this command.
043    private final static List<FieldDefinition> FORM_FIELD_DEFINITIONS;
044    
045    static {
046        FORM_FIELD_DEFINITIONS = List.of(
047                new FieldDefinition("LanguageIsoName", FieldType.ENTITY_NAME, false, null, null),
048                new FieldDefinition("EntityRef", FieldType.ENTITY_REF, false, null, null),
049                new FieldDefinition("Uuid", FieldType.UUID, false, null, null)
050        );
051    }
052
053    @Inject
054    PartyControl partyControl;
055
056    @Inject
057    EntityInstanceLogic entityInstanceLogic;
058
059    @Inject
060    LanguageLogic languageLogic;
061
062    
063    /** Creates a new instance of GetLanguageCommand */
064    public GetLanguageCommand() {
065        super(null, FORM_FIELD_DEFINITIONS, true);
066    }
067    
068    @Override
069    protected Language getEntity() {
070        Language language = null;
071        var languageIsoName = form.getLanguageIsoName();
072        var parameterCount = (languageIsoName == null ? 0 : 1) + entityInstanceLogic.countPossibleEntitySpecs(form);
073
074        switch(parameterCount) {
075            case 0 -> language = partyControl.getDefaultLanguage();
076            case 1 -> {
077                if(languageIsoName == null) {
078                    var entityInstance = entityInstanceLogic.getEntityInstance(this, form,
079                            ComponentVendors.ECHO_THREE.name(), EntityTypes.Language.name());
080
081                    if(!hasExecutionErrors()) {
082                        language = partyControl.getLanguageByEntityInstance(entityInstance);
083                    }
084                } else {
085                    language = languageLogic.getLanguageByName(this, languageIsoName);
086                }
087            }
088            default -> addExecutionError(ExecutionErrors.InvalidParameterCount.name());
089        }
090        
091        if(language != null) {
092            sendEvent(language.getPrimaryKey(), EventTypes.READ, null, null, getPartyPK());
093        }
094
095        return language;
096    }
097    
098    @Override
099    protected BaseResult getResult(Language language) {
100        var result = PartyResultFactory.getGetLanguageResult();
101
102        if(language != null) {
103            result.setLanguage(partyControl.getLanguageTransfer(getUserVisit(), language));
104        }
105
106        return result;
107    }
108    
109}