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 $

        }


        int sortByNum = sortBy.length;


        // - use the Comparator chain to provide SQL like sorting of properties
        final ComparatorChain chain = new ComparatorChain();
        for (int ctr = 0; ctr < sortByNum; ctr++)
        {
            final SortCriteria orderBy = sortBy[ctr];
            chain.addComparator(new BeanComparator(orderBy));
        }


        Collections.sort(
            sorted,
            chain);

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            }
        }


        if (messages != null && !messages.isEmpty())
        {
            final ComparatorChain chain = new ComparatorChain();
            chain.addComparator(new ValidationMessageTypeComparator());
            chain.addComparator(new ValidationMessageNameComparator());
            Collections.sort(
                messages,
                chain);
        }
    }

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


        if (comp == null)
            return val;

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


        if (comp == null)
            return val;

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


        if (comp == null)
            return val;

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

                }
            }


            // 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);
            }

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     * @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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