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/******************************************************************************* |
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* Copyright (c) 2009 IBM Corporation and others. |
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* All rights reserved. This program and the accompanying materials |
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* are made available under the terms of the Eclipse Public License v1.0 |
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* which accompanies this distribution, and is available at |
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* http://www.eclipse.org/legal/epl-v10.html |
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* |
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* Contributors: |
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* IBM Corporation - initial API and implementation |
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*******************************************************************************/ |
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package org.eclipse.equinox.internal.provisional.p2.artifact.repository; |
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import java.util.*; |
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import org.eclipse.equinox.internal.provisional.p2.metadata.IArtifactKey; |
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|
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/** |
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* An iterator over an IArtifactRepository |
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* Returns IArtifactKey's and IArtifactDescriptor's. First a key is returned, |
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* then that key's descriptors, and again for the next key. |
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*/ |
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public class ArtifactIterator implements Iterator { |
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private final IArtifactRepository artifactRepository; |
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private Iterator keys = null; |
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private Iterator descriptors = null; |
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private boolean returnKeys = false; |
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private boolean returnDescriptors = false; |
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|
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/** |
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* @param artifactRepository - the artifact repository |
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* @param returnKeys - whether or not to include IArtifactKey's in the iteration |
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* @param returnDescriptors - whether or not to include IArtifactDescriptor's in the iteration |
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*/ |
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public ArtifactIterator(IArtifactRepository artifactRepository, boolean returnKeys, boolean returnDescriptors) { |
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this.artifactRepository = artifactRepository; |
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this.returnDescriptors = returnDescriptors; |
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this.returnKeys = returnKeys; |
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//initialize the key interator |
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keys = Arrays.asList(artifactRepository.getArtifactKeys()).iterator(); |
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} |
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|
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/** |
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* See {@link Iterator#hasNext()} |
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*/ |
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public boolean hasNext() { |
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if (!returnDescriptors && !returnKeys) |
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return false; //perhaps this is an exception? |
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|
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if (!returnDescriptors) |
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return keys.hasNext(); //keys only |
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|
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if (returnKeys) //keys and descriptors |
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return (descriptors != null && descriptors.hasNext()) || keys.hasNext(); |
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|
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//descriptors only |
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if (descriptors != null && descriptors.hasNext()) |
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return true; |
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while (keys.hasNext()) { |
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IArtifactKey key = (IArtifactKey) keys.next(); |
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descriptors = Arrays.asList(artifactRepository.getArtifactDescriptors(key)).iterator(); |
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if (descriptors.hasNext()) |
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return true; |
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} |
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return false; |
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} |
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|
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/** |
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* See {@link Iterator#next()} |
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*/ |
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public Object next() { |
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if (!returnDescriptors && !returnKeys) |
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throw new NoSuchElementException(); |
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|
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if (!returnDescriptors) |
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return keys.next(); //keys only |
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|
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if (returnKeys) { |
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//keys and descriptors |
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if (descriptors != null && descriptors.hasNext()) |
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return descriptors.next(); |
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|
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IArtifactKey nextKey = (IArtifactKey) keys.next(); |
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descriptors = Arrays.asList(artifactRepository.getArtifactDescriptors(nextKey)).iterator(); |
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return nextKey; |
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} |
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|
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//descriptors only |
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if (descriptors != null && descriptors.hasNext()) |
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return descriptors.next(); |
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while (keys.hasNext()) { |
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IArtifactKey key = (IArtifactKey) keys.next(); |
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descriptors = Arrays.asList(artifactRepository.getArtifactDescriptors(key)).iterator(); |
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if (!descriptors.hasNext()) |
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continue; |
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return descriptors.next(); |
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} |
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throw new NoSuchElementException(); |
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} |
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/** |
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* Returns true if the iteration contains more IArtifactKeys |
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* @return boolean |
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*/ |
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public boolean hasNextKey() { |
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if (!returnKeys) |
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return false; |
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return keys.hasNext(); |
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} |
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/** |
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* Get the next IArtifactKey skipping over any IArtifactDescriptor's |
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* @return IArtifactKey |
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* @throws IllegalStateException if this iterator is not returning keys |
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*/ |
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public IArtifactKey nextKey() { |
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if (!returnKeys) |
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throw new IllegalStateException(); |
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IArtifactKey next = (IArtifactKey) keys.next(); |
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if (returnDescriptors) |
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descriptors = Arrays.asList(artifactRepository.getArtifactDescriptors(next)).iterator(); |
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return next; |
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} |
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/** |
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* See {@link Iterator#remove()} |
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* This operation is not supported |
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* @throws UnsupportedOperationException |
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*/ |
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public void remove() { |
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throw new UnsupportedOperationException(); |
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} |
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} |
