Add utility for storing values in a repository query attribute

Change-Id: Iae11bb46d4f04b5ae96aead7168aec4b7ad5a56d
Signed-off-by: Kevin Sawicki <kevin@github.com>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>

1 files changed, 78 insertions, 0 deletions

diff --git a/org.eclipse.mylyn.github.core/src/org/eclipse/mylyn/github/internal/QueryUtils.java b/org.eclipse.mylyn.github.core/src/org/eclipse/mylyn/github/internal/QueryUtils.java
new file mode 100644
index 00000000..c2496f3d
--- /dev/null
+++ b/org.eclipse.mylyn.github.core/src/org/eclipse/mylyn/github/internal/QueryUtils.java
@@ -0,0 +1,78 @@
+/*******************************************************************************
+ *  Copyright (c) 2011 GitHub Inc.
+ *  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:
+ *    Kevin Sawicki (GitHub Inc.) - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.mylyn.github.internal;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+
+import org.eclipse.mylyn.tasks.core.IRepositoryQuery;
+
+/**
+ * Utilities for working with {@link IRepositoryQuery} objects.
+ * 
+ * @author Kevin Sawicki (kevin@github.com)
+ */
+public abstract class QueryUtils {
+
+	/**
+	 * DELIMITER
+	 */
+	public static final String DELIMITER = "::"; //$NON-NLS-1$
+
+	/**
+	 * Set attribute
+	 * 
+	 * @param key
+	 * @param values
+	 * @param query
+	 */
+	public static void setAttribute(String key, Collection<String> values,
+			IRepositoryQuery query) {
+		if (key == null || query == null)
+			return;
+
+		if (values != null && !values.isEmpty()) {
+			StringBuilder value = new StringBuilder();
+			for (String entry : values)
+				value.append(entry).append(DELIMITER);
+			query.setAttribute(key, value.toString());
+		} else
+			query.setAttribute(key, null);
+
+	}
+
+	/**
+	 * Get attribute
+	 * 
+	 * @param key
+	 * @param query
+	 * @return non-null but possibly empty list
+	 */
+	public static List<String> getAttributes(String key, IRepositoryQuery query) {
+		if (key == null || query == null)
+			return Collections.emptyList();
+
+		String attribute = query.getAttribute(key);
+		if (attribute == null || attribute.length() == 0)
+			return Collections.emptyList();
+
+		List<String> attrs = new LinkedList<String>();
+		String[] values = attribute.split(DELIMITER);
+		for (String value : values)
+			if (value.length() > 0)
+				attrs.add(value);
+
+		return attrs;
+	}
+
+}