Add support for converting JSON dates to Java dates.

Change-Id: If328b7023e0b8cdc4f19f23fd473b4189b2ffe4e
Signed-off-by: Kevin Sawicki <kevin@github.com>

2 files changed, 97 insertions, 1 deletions

diff --git a/org.eclipse.mylyn.github.core/src/org/eclipse/mylyn/github/internal/DateFormatter.java b/org.eclipse.mylyn.github.core/src/org/eclipse/mylyn/github/internal/DateFormatter.java
new file mode 100644
index 00000000..de356f16
--- /dev/null
+++ b/org.eclipse.mylyn.github.core/src/org/eclipse/mylyn/github/internal/DateFormatter.java
@@ -0,0 +1,92 @@
+/*******************************************************************************
+ *  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 com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonParseException;
+
+import java.lang.reflect.Type;
+import java.text.DateFormat;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.TimeZone;
+
+/**
+ * Date formatter for multiple date formats present in the GitHub v2 API.
+ *
+ * @author Kevin Sawicki (kevin@github.com)
+ */
+public class DateFormatter implements JsonDeserializer<Date> {
+
+	/**
+	 * DATE_FORMAT1
+	 */
+	public static final String DATE_FORMAT1 = "yyyy/MM/dd HH:mm:ss Z";
+
+	/**
+	 * DATE_FORMAT2
+	 */
+	public static final String DATE_FORMAT2 = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";
+
+	/**
+	 * DATE_FORMAT3
+	 */
+	public static final String DATE_FORMAT3 = "yyyy-MM-dd'T'HH:mm:ss'Z'";
+
+	/**
+	 * DATE_FORMAT4
+	 */
+	public static final String DATE_FORMAT4 = "yyyy-MM-dd'T'HH:mm:ss";
+
+	private static final String[] FORMATS = new String[] { DATE_FORMAT1,
+			DATE_FORMAT2, DATE_FORMAT3, DATE_FORMAT4 };
+
+	private List<DateFormat> formats;
+
+	/**
+	 * Create date formatter
+	 */
+	public DateFormatter() {
+		this.formats = new LinkedList<DateFormat>();
+		TimeZone timeZone = TimeZone.getTimeZone("Zulu");
+		for (String format : FORMATS) {
+			DateFormat dateFormat = new SimpleDateFormat(format);
+			dateFormat.setTimeZone(timeZone);
+			this.formats.add(dateFormat);
+		}
+	}
+
+	/**
+	 * @see com.google.gson.JsonDeserializer#deserialize(com.google.gson.JsonElement,
+	 *      java.lang.reflect.Type, com.google.gson.JsonDeserializationContext)
+	 */
+	public Date deserialize(JsonElement json, Type typeOfT,
+			JsonDeserializationContext context) throws JsonParseException {
+		String string = json.getAsString();
+		Exception exception = null;
+		for (DateFormat format : this.formats) {
+			try {
+				synchronized (format) {
+					return format.parse(string);
+				}
+			} catch (ParseException e) {
+				exception = e;
+			}
+		}
+		throw new JsonParseException(exception);
+	}
+
+}
diff --git a/org.eclipse.mylyn.github.core/src/org/eclipse/mylyn/github/internal/GitHubService.java b/org.eclipse.mylyn.github.core/src/org/eclipse/mylyn/github/internal/GitHubService.java
index 17171f60..9a5b7438 100644
--- a/org.eclipse.mylyn.github.core/src/org/eclipse/mylyn/github/internal/GitHubService.java
+++ b/org.eclipse.mylyn.github.core/src/org/eclipse/mylyn/github/internal/GitHubService.java
@@ -13,6 +13,7 @@
 package org.eclipse.mylyn.github.internal;
 
 import java.io.IOException;
+import java.util.Date;
 
 import org.apache.commons.httpclient.Credentials;
 import org.apache.commons.httpclient.HttpClient;
@@ -29,6 +30,7 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
 import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
 
 /**
  * Facility to perform API operations on a GitHub issue tracker.
@@ -78,7 +80,9 @@ public class GitHubService {
 	 */
 	public GitHubService() {
 		httpClient = new HttpClient();
-		gson = new Gson();
+		GsonBuilder builder = new GsonBuilder();
+		builder.registerTypeAdapter(Date.class, new DateFormatter());
+		gson = builder.create();
 	}
 
 	/**