Examples of org.apache.commons.collections.iterators.IteratorChain

Package org.apache.commons.collections.iterators

Examples of org.apache.commons.collections.iterators.IteratorChain

org.apache.commons.collections.iterators.IteratorChain
An IteratorChain is an Iterator that wraps a number of Iterators.
This class makes multiple iterators look like one to the caller When any method from the Iterator interface is called, the IteratorChain will delegate to a single underlying Iterator. The IteratorChain will invoke the Iterators in sequence until all Iterators are exhausted.
Under many circumstances, linking Iterators together in this manner is more efficient (and convenient) than reading out the contents of each Iterator into a List and creating a new Iterator.
Calling a method that adds new Iteratorafter a method in the Iterator interface has been called will result in an UnsupportedOperationException. Subclasses should take care to not alter the underlying List of Iterators.
NOTE: As from version 3.0, the IteratorChain may contain no iterators. In this case the class will function as an empty iterator. @since Commons Collections 2.1 @version $Revision: 647116 $ $Date: 2008-04-11 12:23:08 +0100 (Fri, 11 Apr 2008) $ @author Morgan Delagrange @author Stephen Colebourne

        } catch (RepositoryException re) {
            log.warn("inconsistent hierarchy state", re);
        }
        // create an iterator over the collected descendants
        // in decreasing depth order
        IteratorChain resultIter = new IteratorChain();
        for (int i = la.length - 1; i >= 0; i--) {
            List list = la[i];
            if (list != null) {
                resultIter.addIterator(list.iterator());
            }
        }
        /**
         * if the resulting iterator chain is empty return
         * EMPTY_LIST.iterator() instead because older versions
         * of IteratorChain (pre Commons Collections 3.1)
         * would throw UnsupportedOperationException in this
         * situation
         */
        if (resultIter.getIterators().isEmpty()) {
            List<ItemState> empty = Collections.emptyList();
            return empty.iterator();
        }
        return resultIter;
    }

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        } catch (RepositoryException re) {
            log.warn("inconsistent hierarchy state", re);
        }
        // create an iterator over the collected descendants
        // in decreasing depth order
        IteratorChain resultIter = new IteratorChain();
        for (int i = la.length - 1; i >= 0; i--) {
            List list = la[i];
            if (list != null) {
                resultIter.addIterator(list.iterator());
            }
        }
        /**
         * if the resulting iterator chain is empty return
         * EMPTY_LIST.iterator() instead because older versions
         * of IteratorChain (pre Commons Collections 3.1)
         * would throw UnsupportedOperationException in this
         * situation
         */
        if (resultIter.getIterators().isEmpty()) {
            List<ItemState> empty = Collections.emptyList();
            return empty.iterator();
        }
        return resultIter;
    }

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     * @param includeAttic
     * @return iterator over all children entries, that currently are loaded
     * with this NodeEntry
     */
    private Iterator getAllChildEntries(boolean includeAttic) {
        IteratorChain chain = new IteratorChain();
        // attic
        if (includeAttic) {
            Collection attic = propertiesInAttic.values();
            chain.addIterator(new ArrayList(attic).iterator());
        }
        // add props
        synchronized (properties) {
            Collection props = properties.getPropertyEntries();
            chain.addIterator(props.iterator());
        }
        // add childNodeEntries
        synchronized (childNodeEntries) {
            chain.addIterator(childNodeEntries.iterator());
        }
        return chain;
    }

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                        }
                    } catch (RepositoryException e) {
                        // currentNode is probably stale
                    }
                }
                selfAndChildren = new IteratorChain(allIterators);
            }
        }

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                userAces.addAll(uaces);
            }
        }


        private Iterator<AccessControlEntry> iterator() {
            return new IteratorChain(userAces.iterator(), groupAces.iterator());
        }

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            case PrincipalManager.SEARCH_TYPE_ALL:
                PrincipalIterator[] its = new PrincipalIterator[] {
                        findUserPrincipals(simpleFilter),
                        findGroupPrincipals(simpleFilter)
                };
                return new PrincipalIteratorAdapter(new IteratorChain(its));
            default:
                throw new IllegalArgumentException("Invalid searchType");
        }
    }

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        } catch (RepositoryException re) {
            log.warn("inconsistent hierarchy state", re);
        }
        // create an iterator over the collected descendants
        // in decreasing depth order
        IteratorChain resultIter = new IteratorChain();
        for (int i = la.length - 1; i >= 0; i--) {
            List list = la[i];
            if (list != null) {
                resultIter.addIterator(list.iterator());
            }
        }
        /**
         * if the resulting iterator chain is empty return
         * EMPTY_LIST.iterator() instead because older versions
         * of IteratorChain (pre Commons Collections 3.1)
         * would throw UnsupportedOperationException in this
         * situation
         */
        if (resultIter.getIterators().isEmpty()) {
            List<ItemState> empty = Collections.emptyList();
            return empty.iterator();
        }
        return resultIter;
    }

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        } catch (RepositoryException re) {
            log.warn("inconsistent hierarchy state", re);
        }
        // create an iterator over the collected descendants
        // in decreasing depth order
        IteratorChain resultIter = new IteratorChain();
        for (int i = la.length - 1; i >= 0; i--) {
            List list = la[i];
            if (list != null) {
                resultIter.addIterator(list.iterator());
            }
        }
        /**
         * if the resulting iterator chain is empty return
         * EMPTY_LIST.iterator() instead because older versions
         * of IteratorChain (pre Commons Collections 3.1)
         * would throw UnsupportedOperationException in this
         * situation
         */
        if (resultIter.getIterators().isEmpty()) {
            List<ItemState> empty = Collections.emptyList();
            return empty.iterator();
        }
        return resultIter;
    }

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            return toIterator(IteratorUtils.arrayIterator(value), delimiter);
        }
        else if (value instanceof Iterator)
        {
            Iterator iterator = (Iterator) value;
            IteratorChain chain = new IteratorChain();
            while (iterator.hasNext())
            {
                chain.addIterator(toIterator(iterator.next(), delimiter));
            }
            return chain;
        }
        else
        {

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        private boolean removeCleanInternal(StateManagerImpl sm) {
            return _clean != null && _clean.remove(sm);
        }


        public Iterator iterator() {
            IteratorChain chain = new IteratorChain();
            if (_dirty != null && !_dirty.isEmpty())
                chain.addIterator(_dirty.iterator());
            if (_clean != null && !_clean.isEmpty())
                chain.addIterator(_clean.iterator());
            return chain;
        }

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