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5: Design Patterns
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if (mainQuery == ' ') { mainQuery = 'A'; } else { if ((subQuery == ' ') && (forUsed)) { subQuery = 'A'; } } } else if (currentToken.equals("for")) { forUsed = true; } else if ((searchString == null) && (subQuery != ' ') && (currentToken.startsWith("<"))) { searchString = currentToken; searchStarted = true; if (currentToken.endsWith(">")) { searchEnded = true; } } else if ((searchStarted) && (!searchEnded)) { searchString = searchString + " " + currentToken; if (currentToken.endsWith(">")) { searchEnded = true; } } } if (searchString != null) { searchString = searchString.substring(1,(searchString.length() - 1));//remove <> } BookAbstractExpression abstractExpression; switch (mainQuery) { case 'A' : { switch (subQuery) { case 'T' : { abstractExpression = new BookAuthorTitleExpression(searchString); break; } default : { abstractExpression = new BookAuthorExpression(); break; } } break; } case 'T' : { switch (subQuery) { case 'A' : { abstractExpression = new BookTitleAuthorExpression(searchString); break; } default : { abstractExpression = new BookTitleExpression(); break; } }
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break; } default : return result.toString(); } result.append(abstractExpression.interpret(bookInterpreterContext)); return result.toString(); } } class BookInterpreterContext { private ArrayList titles = new ArrayList(); private ArrayList authors = new ArrayList(); private ArrayList titlesAndAuthors = new ArrayList(); public void addTitle(String title) {titles.add(title);} public void addAuthor(String author) {authors.add(author);} public void addTitleAndAuthor(TitleAndAuthor titleAndAuthor) {titlesAndAuthors.add(titleAndAuthor);} public ArrayList getAllTitles() {return titles;} public ArrayList getAllAuthors() {return authors;} public ArrayList getAuthorsForTitle(String titleIn) { ArrayList authorsForTitle = new ArrayList(); TitleAndAuthor tempTitleAndAuthor; ListIterator titlesAndAuthorsIterator = titlesAndAuthors.listIterator(); while (titlesAndAuthorsIterator.hasNext()) { tempTitleAndAuthor = (TitleAndAuthor)titlesAndAuthorsIterator.next(); if (titleIn.equals(tempTitleAndAuthor.getTitle())) { authorsForTitle.add(tempTitleAndAuthor.getAuthor()); } } return authorsForTitle; } public ArrayList getTitlesForAuthor(String authorIn) { ArrayList titlesForAuthor = new ArrayList(); TitleAndAuthor tempTitleAndAuthor; ListIterator authorsAndTitlesIterator = titlesAndAuthors.listIterator(); while (authorsAndTitlesIterator.hasNext()) { tempTitleAndAuthor = (TitleAndAuthor)authorsAndTitlesIterator.next(); if (authorIn.equals(tempTitleAndAuthor.getAuthor())) { titlesForAuthor.add(tempTitleAndAuthor.getTitle()); } } return titlesForAuthor; } } abstract class BookAbstractExpression { public abstract String interpret(BookInterpreterContext parm); } class BookAuthorExpression extends BookAbstractExpression { public String interpret(BookInterpreterContext parm) { ArrayList authors = parm.getAllAuthors(); ListIterator authorsIterator = authors.listIterator();
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StringBuffer titleBuffer = new StringBuffer(""); boolean first = true; while (authorsIterator.hasNext()) { if (!first) {titleBuffer.append(", ");} else {first = false;} titleBuffer.append((String)authorsIterator.next()); } return titleBuffer.toString(); } } class BookAuthorTitleExpression extends BookAbstractExpression { String title; public BookAuthorTitleExpression(String parm) {title = parm;} public String interpret(BookInterpreterContext parm) { ArrayList authorsAndTitles = parm.getAuthorsForTitle(title); ListIterator authorsAndTitlesIterator = authorsAndTitles.listIterator(); StringBuffer authorBuffer = new StringBuffer(""); boolean first = true; while (authorsAndTitlesIterator.hasNext()) { if (!first) {authorBuffer.append(", ");} else {first = false;} authorBuffer.append((String)authorsAndTitlesIterator.next()); } return authorBuffer.toString(); } } class BookTitleExpression extends BookAbstractExpression { public String interpret(BookInterpreterContext parm) { ArrayList titles = parm.getAllTitles(); ListIterator titlesIterator = titles.listIterator(); StringBuffer titleBuffer = new StringBuffer(""); boolean first = true; while (titlesIterator.hasNext()) { if (!first) {titleBuffer.append(", ");} else {first = false;} titleBuffer.append((String)titlesIterator.next()); } return titleBuffer.toString(); } } class BookTitleAuthorExpression extends BookAbstractExpression { String title; public BookTitleAuthorExpression(String parm) {title = parm;} public String interpret(BookInterpreterContext parm) { ArrayList titlesAndAuthors = parm.getTitlesForAuthor(title); ListIterator titlesAndAuthorsIterator = titlesAndAuthors.listIterator();
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StringBuffer titleBuffer = new StringBuffer(""); boolean first = true; while (titlesAndAuthorsIterator.hasNext()) { if (!first) {titleBuffer.append(", ");} else {first = false;} titleBuffer.append((String)titlesAndAuthorsIterator.next()); } return titleBuffer.toString(); } } class TitleAndAuthor { private String title; private String author; public TitleAndAuthor(String parm1, String parm2) { title = parm1; author = parm2; } public String getTitle() {return title;} public String getAuthor() {return author;} }
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The Iterator pattern s intent is to provide a way to access the elements of an aggregate object sequentially without exposing its underlying implementation. java.util.Enumeration and java.util.Iterator are examples of the Iterator pattern. The Iterator pattern is also known as Cursor. The UML is shown in Figure 5-16.
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FIGURE 5-16
UML for the Iterator pattern
5: Design Patterns
Benefits Following is a list of benefits of using the Iterator pattern:
n It supports variations in the traversal of a collection. n It simplifies the interface to the collection.
Applicable Scenarios The following scenarios are most appropriate for the Iterator pattern:
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