X-Git-Url: http://git.argeo.org/?a=blobdiff_plain;ds=sidebyside;f=org.argeo.server.jcr%2Fsrc%2Fmain%2Fjava%2Forg%2Fargeo%2Fjcr%2FCollectionNodeIterator.java;fp=org.argeo.server.jcr%2Fsrc%2Fmain%2Fjava%2Forg%2Fargeo%2Fjcr%2FCollectionNodeIterator.java;h=a65907a7a7b276fab32c4d1360da7f054e2052d8;hb=1df1bf64759d35d3d72b9d96b26b71118fdbe031;hp=0000000000000000000000000000000000000000;hpb=3a3d316af102ba410d1d9e6de349d0c8f7ac044f;p=lgpl%2Fargeo-commons.git diff --git a/org.argeo.server.jcr/src/main/java/org/argeo/jcr/CollectionNodeIterator.java b/org.argeo.server.jcr/src/main/java/org/argeo/jcr/CollectionNodeIterator.java new file mode 100644 index 000000000..a65907a7a --- /dev/null +++ b/org.argeo.server.jcr/src/main/java/org/argeo/jcr/CollectionNodeIterator.java @@ -0,0 +1,76 @@ +/* + * Copyright (C) 2007-2012 Argeo GmbH + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.argeo.jcr; + +import java.util.Collection; +import java.util.Iterator; +import java.util.NoSuchElementException; + +import javax.jcr.Node; +import javax.jcr.NodeIterator; + +/** Wraps a collection of nodes in order to read it as a {@link NodeIterator} */ +public class CollectionNodeIterator implements NodeIterator { + private final Long collectionSize; + private final Iterator iterator; + private Integer position = 0; + + public CollectionNodeIterator(Collection nodes) { + super(); + this.collectionSize = (long) nodes.size(); + this.iterator = nodes.iterator(); + } + + public void skip(long skipNum) { + if (skipNum < 0) + throw new IllegalArgumentException( + "Skip count has to be positive: " + skipNum); + + for (long i = 0; i < skipNum; i++) { + if (!hasNext()) + throw new NoSuchElementException("Last element past (position=" + + getPosition() + ")"); + nextNode(); + } + } + + public long getSize() { + return collectionSize; + } + + public long getPosition() { + return position; + } + + public boolean hasNext() { + return iterator.hasNext(); + } + + public Object next() { + return nextNode(); + } + + public void remove() { + iterator.remove(); + } + + public Node nextNode() { + Node node = iterator.next(); + position++; + return node; + } + +}