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POHow to write Utility class so that i can perform lazy loading with DTO design pattern?
 

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  1. POHow to write Utility class so that i can perform lazy loading with DTO design pattern?
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    <p>As i know DTO is used to transfer the objects from one layer to other layers. In my project i am using DTO to transfer the objects from persistance layer to service layer.</p> <p>Here is my Utility class file which helps me to tranfrom persistance object to DTO.</p> <p>PropertyUtil</p> <pre><code> package com.cac.util; import java.util.HashSet; import java.util.Iterator; import java.util.Set; import com.cac.hibernate.Answers; import com.cac.hibernate.Members; import com.cac.hibernate.Questions; import com.cac.hibernate.Sections; import com.cac.to.AnswersTO; import com.cac.to.MembersTO; import com.cac.to.QuestionsTO; import com.cac.to.SectionsTO; public class PropertyUtil { public static Sections getSectionsFromSectionsTO(SectionsTO sectionsto) { Sections sections=new Sections(); sections.setSection_id(sectionsto.getSection_id()); sections.setSection_name(sectionsto.getSection_name()); sections.setSection_desc(sectionsto.getSection_desc()); sections.setThreads(sectionsto.getThreads()); sections.setPosts(sectionsto.getPosts()); sections.setLast_post(sectionsto.getLast_post()); sections.setLast_post_by(PropertyUtil.getMembersFromMembersTO(sectionsto.getLast_post_by())); sections.setQuestion_id(sectionsto.getQuestion_id()); return sections; } public static SectionsTO getSectionsTOFromSections(Sections sections) { SectionsTO sectionsto=new SectionsTO(); sectionsto.setSection_id(sections.getSection_id()); sectionsto.setSection_name(sections.getSection_name()); sectionsto.setSection_desc(sections.getSection_desc()); sectionsto.setThreads(sections.getThreads()); sectionsto.setPosts(sections.getPosts()); sectionsto.setLast_post(sections.getLast_post()); sectionsto.setLast_post_by(PropertyUtil.getMembersTOFromMembers(sections.getLast_post_by())); sectionsto.setQuestion_id(sections.getQuestion_id()); Set&lt;Questions&gt; questions_set=sections.getQuestions_set(); Set&lt;QuestionsTO&gt; questions_set_to=new HashSet&lt;QuestionsTO&gt;(); Iterator&lt;Questions&gt; it=questions_set.iterator(); while(it.hasNext()) { QuestionsTO questionsto=PropertyUtil.getQuestionsTOFromQuestions(it.next()); questions_set_to.add(questionsto); } return sectionsto; } public static Members getMembersFromMembersTO(MembersTO membersto) { Members members=new Members(); members.setMember_id(membersto.getMember_id()); members.setUsername(membersto.getUsername()); members.setPassword(membersto.getPassword()); members.setEmail(membersto.getEmail()); members.setGender(membersto.getGender()); members.setBdate(membersto.getBdate()); members.setImage_path(membersto.getImage_path()); members.setAddress(membersto.getAddress()); members.setBest_at(membersto.getBest_at()); members.setPosition(membersto.getPosition()); members.setJoin_date(membersto.getJoin_date()); //Set&lt;Members&gt; memset=new HashSet&lt;Members&gt;(); //members.setQuestions_set(membersto.getQuestionsto_set()); //mem return members; } public static MembersTO getMembersTOFromMembers(Members members) { MembersTO membersto=new MembersTO(); membersto.setMember_id(members.getMember_id()); membersto.setUsername(members.getUsername()); membersto.setPassword(members.getPassword()); membersto.setEmail(members.getEmail()); membersto.setGender(members.getGender()); membersto.setBdate(members.getBdate()); membersto.setImage_path(members.getImage_path()); membersto.setAddress(members.getAddress()); membersto.setBest_at(members.getBest_at()); membersto.setPosition(members.getPosition()); membersto.setJoin_date(members.getJoin_date()); Set&lt;Questions&gt; questions_set=members.getQuestions_set(); Set&lt;QuestionsTO&gt; questions_set_to=new HashSet&lt;QuestionsTO&gt;(); Iterator&lt;Questions&gt; it=questions_set.iterator(); while(it.hasNext()) { QuestionsTO questionsto=PropertyUtil.getQuestionsTOFromQuestions(it.next()); questions_set_to.add(questionsto); } Set&lt;Answers&gt; answers_set=members.getAnswers_set(); Set&lt;AnswersTO&gt; answers_set_to=new HashSet&lt;AnswersTO&gt;(); Iterator&lt;Answers&gt; answers_it=answers_set.iterator(); while(answers_it.hasNext()) { AnswersTO answersto=PropertyUtil.getAnswersTOFromAnswers(answers_it.next()); answers_set_to.add(answersto); } //members.setQuestions_set(membersto.getQuestionsto_set()); //mem return membersto; } public static QuestionsTO getQuestionsTOFromQuestions(Questions questions) { QuestionsTO questionsto=new QuestionsTO(); questionsto.setQuestion_id(questions.getQuestion_id()); questionsto.setQuestion_title(questions.getQuestion_title()); questionsto.setQuestion_desc(questions.getQuestion_desc()); questionsto.setQ_post_date(questions.getQ_post_date()); questionsto.setReplies(questions.getReplies()); questionsto.setViews(questions.getViews()); questionsto.setLast_post_by(questions.getLast_post_by()); questionsto.setLast_post_date(questions.getLast_post_date()); Set&lt;Answers&gt; answers_set=questions.getAnswers_set(); Set&lt;AnswersTO&gt; answers_set_to=new HashSet&lt;AnswersTO&gt;(); Iterator&lt;Answers&gt; answers_it=answers_set.iterator(); while(answers_it.hasNext()) { AnswersTO answersto=PropertyUtil.getAnswersTOFromAnswers(answers_it.next()); answers_set_to.add(answersto); } return questionsto; } public static Questions getQuestionsFromQuestionsTO(QuestionsTO questionsto) { Questions questions=new Questions(); questions.setQuestion_id(questionsto.getQuestion_id()); questions.setQuestion_title(questionsto.getQuestion_title()); questions.setQuestion_desc(questionsto.getQuestion_desc()); questions.setQ_post_date(questionsto.getQ_post_date()); questions.setReplies(questionsto.getReplies()); questions.setViews(questionsto.getViews()); questions.setLast_post_by(questionsto.getLast_post_by()); questions.setLast_post_date(questionsto.getLast_post_date()); return questions; } public static AnswersTO getAnswersTOFromAnswers(Answers answers) { AnswersTO answersto=new AnswersTO(); answersto.setAnswer_id(answers.getAnswer_id()); answersto.setAnswer_desc(answers.getAnswer_desc()); answersto.setA_post_date(answers.getA_post_date()); return answersto; } public static Answers getAnswersFromAnswersTO(AnswersTO answersto) { Answers answers=new Answers(); answers.setAnswer_id(answersto.getAnswer_id()); answers.setAnswer_desc(answersto.getAnswer_desc()); answers.setA_post_date(answersto.getA_post_date()); return answers; } } </code></pre> <p>The thing is that whenever i have to perform lazy loading but when i use getSectionsTOFromSection() it will load all the persistence class. . So how to write this PropertyUtil class so that i can use lazy loading and DTO design pattern both ?</p>
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