X-Git-Url: http://git.argeo.org/?a=blobdiff_plain;f=org.argeo.server.jcr%2Fsrc%2Forg%2Fargeo%2Fjcr%2FCollectionNodeIterator.java;fp=org.argeo.server.jcr%2Fsrc%2Forg%2Fargeo%2Fjcr%2FCollectionNodeIterator.java;h=a65907a7a7b276fab32c4d1360da7f054e2052d8;hb=cf3a914f6fbf31b43be5cb86e54d05e8543be6a9;hp=0000000000000000000000000000000000000000;hpb=2e854796e0a27c9ef9e29b0664132a87ddbd1285;p=lgpl%2Fargeo-commons.git

diff --git a/org.argeo.server.jcr/src/org/argeo/jcr/CollectionNodeIterator.java b/org.argeo.server.jcr/src/org/argeo/jcr/CollectionNodeIterator.java
new file mode 100644
index 000000000..a65907a7a
--- /dev/null
+++ b/org.argeo.server.jcr/src/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<Node> iterator;
+	private Integer position = 0;
+
+	public CollectionNodeIterator(Collection<Node> 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;
+	}
+
+}