1 files changed, 73 insertions, 0 deletions
diff --git a/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/prov/query/Query.java b/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/prov/query/Query.java
new file mode 100644
index 000000000..ac91489ed
--- /dev/null
+++ b/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/prov/query/Query.java
@@ -0,0 +1,73 @@
+/*******************************************************************************
+ * Copyright (c) 2007 IBM Corporation 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: IBM Corporation - initial API and implementation
+ ******************************************************************************/
+package org.eclipse.equinox.prov.query;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.NullProgressMonitor;
+import org.eclipse.equinox.internal.prov.metadata.Messages;
+import org.eclipse.equinox.prov.metadata.*;
+import org.eclipse.osgi.service.resolver.VersionRange;
+
+public class Query {
+
+	public static boolean match(IInstallableUnit source, String id, VersionRange range, RequiredCapability[] requirements, boolean and) {
+		if (id != null && !source.getId().equals(id))
+			return false;
+		if (range != null && !range.isIncluded(source.getVersion()))
+			return false;
+		if (requirements == null)
+			return true;
+		// if any of the requirements are met by any of the capabilities of the source...
+		for (int k = 0; k < requirements.length; k++) {
+			boolean valid = false;
+			ProvidedCapability[] capabilities = source.getProvidedCapabilities();
+			for (int j = 0; j < capabilities.length; j++)
+				//TODO Need to deal with option and multiplicity flag
+				if ((requirements[k].getName().equals(capabilities[j].getName()) && requirements[k].getNamespace().equals(capabilities[j].getNamespace()) && (requirements[k].getRange() == null ? true : requirements[k].getRange().isIncluded(capabilities[j].getVersion())))) {
+					valid = true;
+				}
+			// if we are OR'ing then the first time we find a requirement that is met, return success
+			if (valid && !and)
+				return true;
+			// if we are AND'ing then the first time we find a requirement that is NOT met, return failure
+			if (!valid && and)
+				return false;
+		}
+		// if we get past the requirements check and we are AND'ing then return true 
+		// since all requirements must have been met.  If we are OR'ing then return false 
+		// since none of the requirements were met.
+		return and;
+	}
+
+	public static IInstallableUnit[] query(IQueryable[] sources, String id, VersionRange range, RequiredCapability[] requirements, boolean and, IProgressMonitor progress) {
+		if (progress == null)
+			progress = new NullProgressMonitor();
+
+		progress.beginTask(Messages.QUERY_PROGRESS, sources.length);
+		ArrayList result = new ArrayList();
+		for (int i = 0; i < sources.length; i++) {
+			IQueryable source = sources[i];
+			IInstallableUnit[] list = source.query(id, range, requirements, and, progress);
+			for (int j = 0; j < list.length; j++)
+				result.add(list[j]);
+			progress.worked(1);
+		}
+		progress.done();
+		return (IInstallableUnit[]) result.toArray(new IInstallableUnit[result.size()]);
+	}
+
+	public static Iterator getIterator(IQueryable[] sources, String id, VersionRange range, RequiredCapability[] requirements, boolean and) {
+		Iterator[] result = new Iterator[sources.length];
+		for (int i = 0; i < sources.length; i++)
+			result[i] = sources[i].getIterator(id, range, requirements, and);
+		return new CompoundIterator(result);
+	}
+}