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/*******************************************************************************
* Copyright (c) 2010, 2017 Cloudsmith Inc. and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Cloudsmith Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.p2.artifact.repository.simple;
import java.util.*;
import org.eclipse.equinox.internal.p2.core.helpers.CollectionUtils;
import org.eclipse.equinox.internal.p2.metadata.ArtifactKey;
import org.eclipse.equinox.internal.p2.metadata.index.Index;
import org.eclipse.equinox.p2.metadata.IArtifactKey;
import org.eclipse.equinox.p2.metadata.expression.IEvaluationContext;
import org.eclipse.equinox.p2.metadata.expression.IExpression;
/**
* An index that maps id to IArtifactKey
*/
public class KeyIndex extends Index<IArtifactKey> {
// Memory conserving map. Stores either String -> IArtifactKey
// or String -> IArtifactKey[]
// A stored array is always length >= 2.
private final Map<String, Object> artifactMap;
public KeyIndex(Collection<IArtifactKey> artifactKeys) {
artifactMap = new HashMap<>(artifactKeys.size());
for (IArtifactKey ak : artifactKeys) {
Object prev = artifactMap.put(ak.getId(), ak);
if (prev != null) {
if (prev instanceof IArtifactKey)
artifactMap.put(ak.getId(), new IArtifactKey[] {(IArtifactKey) prev, ak});
else {
IArtifactKey[] prevArr = (IArtifactKey[]) prev;
IArtifactKey[] nxtArr = new IArtifactKey[prevArr.length + 1];
System.arraycopy(prevArr, 0, nxtArr, 0, prevArr.length);
nxtArr[prevArr.length] = ak;
artifactMap.put(ak.getId(), nxtArr);
}
}
}
}
@Override
public Iterator<IArtifactKey> getCandidates(IEvaluationContext ctx, IExpression variable, IExpression booleanExpr) {
Object queriedKeys = getQueriedIDs(ctx, variable, ArtifactKey.MEMBER_ID, booleanExpr, null);
if (queriedKeys == null)
return null;
Collection<IArtifactKey> collector = null;
if (queriedKeys.getClass().isArray()) {
Object[] keyArr = (Object[]) queriedKeys;
int idx = keyArr.length;
while (--idx >= 0) {
Object v = artifactMap.get(keyArr[idx]);
if (v == null)
continue;
if (collector == null)
collector = new ArrayList<>();
if (v instanceof IArtifactKey)
collector.add((IArtifactKey) v);
else {
IArtifactKey[] akArr = (IArtifactKey[]) v;
for (IArtifactKey ak : akArr)
collector.add(ak);
}
}
if (collector == null)
collector = Collections.<IArtifactKey> emptySet();
} else {
Object v = artifactMap.get(queriedKeys);
if (v == null)
collector = Collections.<IArtifactKey> emptySet();
else if (v instanceof IArtifactKey)
collector = Collections.singleton((IArtifactKey) v);
else
collector = CollectionUtils.unmodifiableList((IArtifactKey[]) v);
}
return collector.iterator();
}
}
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