Examples of org.apache.commons.collections.comparators.ComparatorChain

Package org.apache.commons.collections.comparators

Examples of org.apache.commons.collections.comparators.ComparatorChain

org.apache.commons.collections.comparators.ComparatorChain

A ComparatorChain is a Comparator that wraps one or more Comparators in sequence. The ComparatorChain calls each Comparator in sequence until either 1) any single Comparator returns a non-zero result (and that result is then returned), or 2) the ComparatorChain is exhausted (and zero is returned). This type of sorting is very similar to multi-column sorting in SQL, and this class allows Java classes to emulate that kind of behaviour when sorting a List.

To further facilitate SQL-like sorting, the order of any single Comparator in the list can be reversed.

Calling a method that adds new Comparators or changes the ascend/descend sort after compare(Object, Object) has been called will result in an UnsupportedOperationException. However, take care to not alter the underlying List of Comparators or the BitSet that defines the sort order.

Instances of ComparatorChain are not synchronized. The class is not thread-safe at construction time, but it is thread-safe to perform multiple comparisons after all the setup operations are complete.
@since Commons Collections 2.0 @author Morgan Delagrange @version $Revision: 1.18 $ $Date: 2004/05/16 11:48:49 $

     * @return a {@link ComparatorChain} formed from the input comparators
     * @throws NullPointerException if comparators array is null or contains a null
     * @see ComparatorChain
     */
    public static Comparator chainedComparator(Comparator[] comparators) {
        ComparatorChain chain = new ComparatorChain();
        for (int i = 0; i < comparators.length; i++) {
            if (comparators[i] == null) {
                throw new NullPointerException("Comparator cannot be null");
            }
            chain.addComparator(comparators[i]);
        }
        return chain;
    }

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                strBuffer.append("<td>" + season + "&ordf; </td>");
                strBuffer.append("<td>" + infoExam.getDate() + "</td>");
                strBuffer.append("<td>" + infoExam.getBeginningHour() + "</td>");
                strBuffer.append("<td>" + infoExam.getEndHour() + "</td>");
                strBuffer.append("<td>");
                ComparatorChain comparatorChain = new ComparatorChain();
                comparatorChain.addComparator(new BeanComparator("infoRoom.capacidadeExame"), true);
                comparatorChain.addComparator(new BeanComparator("infoRoom.nome"));
                Collections.sort(infoExam.getWrittenEvaluationSpaceOccupations(), comparatorChain);
                for (int k = 0; k < infoExam.getWrittenEvaluationSpaceOccupations().size(); k++) {
                    if (k > 0) {
                        strBuffer.append(" ");
                    }

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                    infoExecutionDegree.getInfoDegreeCurricularPlan());


            List<InfoClass> classList = LerTurmas.run(infoExecutionDegree, infoExecutionPeriod, null);


            if (!classList.isEmpty()) {
                ComparatorChain comparatorChain = new ComparatorChain();
                comparatorChain.addComparator(new BeanComparator("anoCurricular"));
                comparatorChain.addComparator(new BeanComparator("nome"));
                Collections.sort(classList, comparatorChain);


                request.setAttribute("classList", classList);
            }
        }

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                    }
                    return false;
                }
            });


            ComparatorChain comparator = new ComparatorChain();
            comparator.addComparator(new BeanComparator("infoExecutionYear.year"), true);
            comparator.addComparator(new BeanComparator("name"), true);
            Collections.sort(infoExecutionPeriods, comparator);


            List<LabelValueBean> executionPeriodLabels = new ArrayList<LabelValueBean>();
            CollectionUtils.collect(infoExecutionPeriods, new Transformer() {
                @Override

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    private void sortInfoDegreeCurricularPlans(final List<InfoDegreeCurricularPlan> infoDegreeCurricularPlans) {
        Collections.sort(infoDegreeCurricularPlans, new BeanComparator("name"));
    }


    private void sortInfoCurricularCourseEquivalences(final List<CurricularCourseEquivalence> equivalences) {
        final ComparatorChain chain = new ComparatorChain();
        chain.addComparator(CurricularCourseEquivalence.COMPARATOR_BY_EQUIVALENT_COURSE_NAME);
        chain.addComparator(CurricularCourseEquivalence.COMPARATOR_BY_EQUIVALENT_COURSE_CODE);
        Collections.sort(equivalences, chain);
    }

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        }


        // order list of execution courses by name
        if (infoCurriculum.getInfoCurricularCourse() != null
                && infoCurriculum.getInfoCurricularCourse().getInfoAssociatedExecutionCourses() != null) {
            ComparatorChain comparatorChain = new ComparatorChain();
            comparatorChain.addComparator(new BeanComparator("infoExecutionPeriod.infoExecutionYear.beginDate"), true);
            comparatorChain.addComparator(new BeanComparator("infoExecutionPeriod.beginDate"), true);


            Collections.sort(infoCurriculum.getInfoCurricularCourse().getInfoAssociatedExecutionCourses(), comparatorChain);
        }


        // order list by year, semester
        if (infoCurriculum.getInfoCurricularCourse() != null
                && infoCurriculum.getInfoCurricularCourse().getCurricularCourseExecutionScope() != null) {
            ComparatorChain comparatorChain = new ComparatorChain();
            comparatorChain.addComparator(new BeanComparator("infoCurricularSemester.infoCurricularYear.year"));
            comparatorChain.addComparator(new BeanComparator("infoCurricularSemester.semester"));
            comparatorChain.addComparator(new BeanComparator("infoCurricularCourse.name"));
            Collections.sort(infoCurriculum.getInfoCurricularCourse().getInfoScopes(), comparatorChain);
        }
        infoCurriculum.prepareEnglishPresentation(getLocale(request));
        request.setAttribute("infoCurriculum", infoCurriculum);

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    protected boolean isPresent(final String string) {
        return string != null && string.length() > 0;
    }


    protected void putDegreeCurricularPlansInRequest(final HttpServletRequest request, final List infoDegreeCurricularPlans) {
        final ComparatorChain comparatorChain = new ComparatorChain();
        comparatorChain.addComparator(new BeanComparator("infoDegree.nome"));
        comparatorChain.addComparator(new BeanComparator("initialDate"));
        Collections.sort(infoDegreeCurricularPlans, comparatorChain);
        request.setAttribute("degreeCurricularPlans", infoDegreeCurricularPlans);
    }

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        InfoExecutionPeriod infoExecutionPeriod = (InfoExecutionPeriod) request.getAttribute("infoExecutionPeriod");


        List<InfoExecutionDegree> executionDegrees =
                ReadExecutionDegreesByExecutionYearAndDegreeType.run(infoExecutionPeriod.getInfoExecutionYear().getYear(), null);


        ComparatorChain comparatorChain = new ComparatorChain();


        comparatorChain.addComparator(new BeanComparator("infoDegreeCurricularPlan.infoDegree.tipoCurso"));
        comparatorChain.addComparator(new BeanComparator("infoDegreeCurricularPlan.infoDegree.nome"));


        Collections.sort(executionDegrees, comparatorChain);


        MessageResources messageResources = this.getResources(request, "ENUMERATION_RESOURCES");
        executionDegrees = InfoExecutionDegree.buildLabelValueBeansForList(executionDegrees, messageResources);

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            return orderAsc ? AcademicServiceRequest.EXECUTION_YEAR_AND_OID_COMPARATOR : new ReverseComparator(
                    AcademicServiceRequest.EXECUTION_YEAR_AND_OID_COMPARATOR);
        } else if (orderGetter.equals(REGISTRATION_NUMBER) || orderGetter.equals(DESCRIPTION)
                || orderGetter.equals(URGENT_REQUEST) || orderGetter.equals(REGISTRATION_NUMBER)
                || orderGetter.equals(REQUEST_DATE) || orderGetter.equals(ACTIVE_SITUATION_DATE)) {
            final ComparatorChain chain = new ComparatorChain();
            chain.addComparator(orderAsc ? new BeanComparator(orderGetter) : new ReverseComparator(
                    new BeanComparator(orderGetter)));
            chain.addComparator(DomainObjectUtil.COMPARATOR_BY_ID);
            return chain;
        }


        return null;
    }

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            return null;
        }


        BeanComparator courseName = new BeanComparator("infoCurricularCourse.name");
        BeanComparator executionYear = new BeanComparator("infoExecutionPeriod.infoExecutionYear.year");
        ComparatorChain chainComparator = new ComparatorChain();
        chainComparator.addComparator(courseName);
        chainComparator.addComparator(executionYear);


        Collections.sort(result, chainComparator);


        InfoStudentCurricularPlan infoStudentCurricularPlan = null;
        try {

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