1 files changed, 171 insertions, 0 deletions
diff --git a/org.eclipse.mylyn.tasks.core/src/org/eclipse/mylyn/internal/tasks/core/notifications/Environment.java b/org.eclipse.mylyn.tasks.core/src/org/eclipse/mylyn/internal/tasks/core/notifications/Environment.java
new file mode 100644
index 000000000..aced0f558
--- /dev/null
+++ b/org.eclipse.mylyn.tasks.core/src/org/eclipse/mylyn/internal/tasks/core/notifications/Environment.java
@@ -0,0 +1,171 @@
+/*******************************************************************************
+ * Copyright (c) 2011 Tasktop Technologies 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:
+ *     Tasktop Technologies - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.mylyn.internal.tasks.core.notifications;
+
+import java.util.Collections;
+import java.util.Dictionary;
+import java.util.Hashtable;
+import java.util.List;
+import java.util.Set;
+
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.Platform;
+import org.eclipse.osgi.service.resolver.VersionRange;
+import org.osgi.framework.Bundle;
+import org.osgi.framework.Filter;
+import org.osgi.framework.FrameworkUtil;
+import org.osgi.framework.InvalidSyntaxException;
+import org.osgi.framework.Version;
+
+/**
+ * @author Steffen Pingel
+ */
+public class Environment {
+
+	private final Dictionary<Object, Object> environment;
+
+	public Environment() {
+		environment = new Hashtable<Object, Object>(System.getProperties());
+	}
+
+	public Version getFrameworkVersion() {
+		Bundle bundle = Platform.getBundle("org.eclipse.mylyn"); //$NON-NLS-1$
+		if (bundle != null) {
+			return bundle.getVersion();
+		} else {
+			return Version.emptyVersion;
+		}
+	}
+
+	public Version getPlatformVersion() {
+		Bundle bundle = Platform.getBundle("org.eclipse.platform"); //$NON-NLS-1$
+		if (bundle == null) {
+			bundle = Platform.getBundle(Platform.PI_RUNTIME);
+		}
+		if (bundle != null) {
+			String versionString = bundle.getHeaders().get(org.osgi.framework.Constants.BUNDLE_VERSION);
+			try {
+				return new Version(versionString);
+			} catch (IllegalArgumentException e) {
+				// should never happen
+			}
+		}
+		return Version.emptyVersion;
+	}
+
+	public Version getRuntimeVersion() {
+		Version result = parseRuntimeVersion(System.getProperty("java.runtime.version")); //$NON-NLS-1$
+		if (result == Version.emptyVersion) {
+			result = parseRuntimeVersion(System.getProperty("java.version")); //$NON-NLS-1$
+		}
+		return result;
+	}
+
+	@SuppressWarnings({ "unchecked", "rawtypes" })
+	public boolean matches(FeedEntry entry, IProgressMonitor monitor) {
+		if (!matchesVersion(entry.getFilter("frameworkVersion"), getFrameworkVersion())) { //$NON-NLS-1$
+			return false;
+		}
+		if (!matchesVersion(entry.getFilter("platformVersion"), getPlatformVersion())) { //$NON-NLS-1$
+			return false;
+		}
+		if (!matchesVersion(entry.getFilter("runtimeVersion"), getRuntimeVersion())) { //$NON-NLS-1$
+			return false;
+		}
+		List<String> filterExpressions = entry.getFilters("filter"); //$NON-NLS-1$
+		for (String filterExpression : filterExpressions) {
+			try {
+				Filter filter = FrameworkUtil.createFilter(filterExpression);
+				if (!filter.match((Dictionary) environment)) {
+					return false;
+				}
+			} catch (InvalidSyntaxException e) {
+				// ignore that filter
+			}
+		}
+		List<String> requiredFeatures = entry.getFilters("requires"); //$NON-NLS-1$
+		for (String requiredFeature : requiredFeatures) {
+			if (!getInstalledFeatures(monitor).contains(parseFeature(requiredFeature))) {
+				return false;
+			}
+		}
+		List<String> conflictedFeatures = entry.getFilters("conflicts"); //$NON-NLS-1$
+		for (String conflictedFeature : conflictedFeatures) {
+			if (getInstalledFeatures(monitor).contains(parseFeature(conflictedFeature))) {
+				return false;
+			}
+		}
+		return true;
+	}
+
+	private int findLastNumberIndex(String versionString, int secondSeparator) {
+		int lastDigit = secondSeparator;
+		for (int i = secondSeparator + 1; i < versionString.length(); i++) {
+			if (Character.isDigit(versionString.charAt(i))) {
+				lastDigit++;
+			} else {
+				break;
+			}
+		}
+		if (lastDigit == secondSeparator) {
+			return secondSeparator - 1;
+		}
+		return lastDigit;
+	}
+
+	public Set<String> getInstalledFeatures(IProgressMonitor monitor) {
+		return Collections.emptySet();
+	}
+
+	private boolean matchesVersion(String expectedVersionRangeExpression, Version actualVersion) {
+		if (expectedVersionRangeExpression != null) {
+			try {
+				VersionRange versionRange = new VersionRange(expectedVersionRangeExpression);
+				if (!versionRange.isIncluded(actualVersion)) {
+					return false;
+				}
+			} catch (IllegalArgumentException e) {
+				// ignore
+			}
+		}
+		return true;
+	}
+
+	private String parseFeature(String requiredFeature) {
+		int i = requiredFeature.indexOf(";"); //$NON-NLS-1$
+		if (i != -1) {
+			return requiredFeature.substring(0, i);
+		}
+		return requiredFeature;
+	}
+
+	private Version parseRuntimeVersion(String versionString) {
+		if (versionString != null) {
+			int firstSeparator = versionString.indexOf('.');
+			if (firstSeparator != -1) {
+				try {
+					int secondSeparator = versionString.indexOf('.', firstSeparator + 1);
+					if (secondSeparator != -1) {
+						return new Version(versionString.substring(0,
+								findLastNumberIndex(versionString, secondSeparator) + 1));
+					}
+					return new Version(versionString.substring(0,
+							findLastNumberIndex(versionString, firstSeparator) + 1));
+				} catch (IllegalArgumentException e) {
+					// ignore
+				}
+			}
+		}
+		return Version.emptyVersion;
+	}
+
+}