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 $

                }
            }


            // Ordering
            if (filter.getOrders() != null) {
                ComparatorChain cchain = new ComparatorChain();
                for (String key : filter.getOrders()) {
                    boolean ascending = true;
                    String orderKey = key;
                    if (key.startsWith("+") || key.startsWith("-")) {
                        orderKey = key.substring(1, key.length());
                        if (key.startsWith("-"))
                            ascending = false;
                    }


                    Comparator c;
                    if ("name".equals(orderKey))
                        c = new Comparator<ProcessConf>() {
                            public int compare(ProcessConf o1, ProcessConf o2) {
                                return o1.getProcessId().getLocalPart().compareTo(o2.getProcessId().getLocalPart());
                            }
                        };
                    else if ("namespace".equals(orderKey))
                        c = new Comparator<ProcessConf>() {
                            public int compare(ProcessConf o1, ProcessConf o2) {
                                String ns1 = o1.getProcessId().getNamespaceURI() == null ? "" : o1.getProcessId()
                                        .getNamespaceURI();
                                String ns2 = o2.getProcessId().getNamespaceURI() == null ? "" : o2.getProcessId()
                                        .getNamespaceURI();
                                return ns1.compareTo(ns2);
                            }
                        };
                    else if ("version".equals(orderKey))
                        c = new Comparator<ProcessConf>() {
                            public int compare(ProcessConf o1, ProcessConf o2) {
                                // TODO: implement version comparisons.
                                return 0;
                            }
                        };
                    else if ("deployed".equals(orderKey))
                        c = new Comparator<ProcessConf>() {
                            public int compare(ProcessConf o1, ProcessConf o2) {
                                return o1.getDeployDate().compareTo(o2.getDeployDate());
                            }


                        };


                    else {
                        // unrecognized
                        __log.debug("unrecognized order key" + orderKey);
                        continue;
                    }


                    cchain.addComparator(c, !ascending);
                }


                Collections.sort(confs, cchain);
            }

View Full Code Here

        }


        Comparator<SystemNotificationModel> notificationTypeComparator = new BeanComparator("notificationType", new SystemNotificationTypeComparator());
        Comparator<SystemNotificationModel> notificationSeverityComparator = new BeanComparator("notificationSeverity", new SystemNotificationSeverityComparator());


        ComparatorChain chain = new ComparatorChain();
        chain.addComparator(notificationTypeComparator);
        chain.addComparator(notificationSeverityComparator);


        Collections.sort(models, chain);


        return models;
    }

View Full Code Here

    @RequestMapping(value = "/search", method = RequestMethod.GET)
    public String displayPage(Model model, UserAgentInfo userAgentInfo) {
        User user = userService.getUserFromSecurityContext();
        List<Application> applications = userService.getApplicationsForUser(user, userAgentInfo.getApplicationType());


        ComparatorChain chain = new ComparatorChain();
        chain.addComparator(new ApplicationNameComparator());
        chain.addComparator(new ApplicationDescriptionComparator());


        Collections.sort(applications, chain);


        List<ApplicationModel> applicationModels = applicationService.createApplicationModels(applications, false);
        model.addAttribute("applications", applicationModels);

View Full Code Here

            for (Application application : userApplications) {
                if ((application.getName().toLowerCase().contains(criteria) || application.getDescription().toLowerCase().contains(criteria)) && !applications.contains(application)) {
                    applications.add(application);
                }
            }
            ComparatorChain chain = new ComparatorChain();
            chain.addComparator(new ApplicationNameComparator());
            chain.addComparator(new ApplicationDescriptionComparator());


            Collections.sort(applications, chain);
        }


        return applications;

View Full Code Here

                }
            }


            // Ordering
            if (filter.getOrders() != null) {
                ComparatorChain cchain = new ComparatorChain();
                for (String key : filter.getOrders()) {
                    boolean ascending = true;
                    String orderKey = key;
                    if (key.startsWith("+") || key.startsWith("-")) {
                        orderKey = key.substring(1, key.length());
                        if (key.startsWith("-"))
                            ascending = false;
                    }


                    Comparator c;
                    if ("name".equals(orderKey))
                        c = new Comparator<ProcessConf>() {
                            public int compare(ProcessConf o1, ProcessConf o2) {
                                return o1.getProcessId().getLocalPart().compareTo(o2.getProcessId().getLocalPart());
                            }
                        };
                    else if ("namespace".equals(orderKey))
                        c = new Comparator<ProcessConf>() {
                            public int compare(ProcessConf o1, ProcessConf o2) {
                                String ns1 = o1.getProcessId().getNamespaceURI() == null ? "" : o1.getProcessId()
                                        .getNamespaceURI();
                                String ns2 = o2.getProcessId().getNamespaceURI() == null ? "" : o2.getProcessId()
                                        .getNamespaceURI();
                                return ns1.compareTo(ns2);
                            }
                        };
                    else if ("version".equals(orderKey))
                        c = new Comparator<ProcessConf>() {
                            public int compare(ProcessConf o1, ProcessConf o2) {
                                // TODO: implement version comparisons.
                                return 0;
                            }
                        };
                    else if ("deployed".equals(orderKey))
                        c = new Comparator<ProcessConf>() {
                            public int compare(ProcessConf o1, ProcessConf o2) {
                                return o1.getDeployDate().compareTo(o2.getDeployDate());
                            }


                        };


                    else {
                        // unrecognized
                        __log.debug("unrecognized order key" + orderKey);
                        continue;
                    }


                    cchain.addComparator(c, !ascending);
                }


                Collections.sort(confs, cchain);
            }

View Full Code Here

                }
            }


            // Ordering
            if (filter.getOrders() != null) {
                ComparatorChain cchain = new ComparatorChain();
                for (String key : filter.getOrders()) {
                    boolean ascending = true;
                    String orderKey = key;
                    if (key.startsWith("+") || key.startsWith("-")) {
                        orderKey = key.substring(1, key.length());
                        if (key.startsWith("-"))
                            ascending = false;
                    }


                    Comparator c;
                    if ("name".equals(orderKey))
                        c = new Comparator<ProcessConf>() {
                            public int compare(ProcessConf o1, ProcessConf o2) {
                                return o1.getProcessId().getLocalPart().compareTo(o2.getProcessId().getLocalPart());
                            }
                        };
                    else if ("namespace".equals(orderKey))
                        c = new Comparator<ProcessConf>() {
                            public int compare(ProcessConf o1, ProcessConf o2) {
                                String ns1 = o1.getProcessId().getNamespaceURI() == null ? "" : o1.getProcessId()
                                        .getNamespaceURI();
                                String ns2 = o2.getProcessId().getNamespaceURI() == null ? "" : o2.getProcessId()
                                        .getNamespaceURI();
                                return ns1.compareTo(ns2);
                            }
                        };
                    else if ("version".equals(orderKey))
                        c = new Comparator<ProcessConf>() {
                            public int compare(ProcessConf o1, ProcessConf o2) {
                                // TODO: implement version comparisons.
                                return 0;
                            }
                        };
                    else if ("deployed".equals(orderKey))
                        c = new Comparator<ProcessConf>() {
                            public int compare(ProcessConf o1, ProcessConf o2) {
                                return o1.getDeployDate().compareTo(o2.getDeployDate());
                            }


                        };


                    else {
                        // unrecognized
                        __log.debug("unrecognized order key" + orderKey);
                        continue;
                    }


                    cchain.addComparator(c, !ascending);
                }


                Collections.sort(confs, cchain);
            }

View Full Code Here

                }
            }
            if (comps == null)
                comp = null;
            else
                comp = new ComparatorChain(comps);
        }


        if (comp == null)
            return val;

View Full Code Here

     * @param iterators  the comparators to use, not null or empty or contain nulls
     * @return a combination comparator over the comparators
     * @throws NullPointerException if comparators array is null or contains a null
     */
    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;
    }

View Full Code Here

    
    public static final ExternalAggregatedGroupMappingComparator INSTANCE = new ExternalAggregatedGroupMappingComparator();
    
    @SuppressWarnings("unchecked")
    private ExternalAggregatedGroupMappingComparator() {
        chain = new ComparatorChain(Arrays.asList(
                new ComparableExtractingComparator<ExternalAggregatedGroupMapping, String>() {
                    @Override
                    protected String getComparable(ExternalAggregatedGroupMapping o) {
                        return o.getGroupService();
                    }

View Full Code Here

                }
            }
            if (comps == null)
                comp = null;
            else
                comp = new ComparatorChain(comps);
        }


        if (comp == null)
            return val;

View Full Code Here

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