PT 156967558 - Replace ObjectMapper with Gson in Bosh LS

headless-services/commons/commons-util/src/main/java/org/springframework/ide/vscode/commons/util/GsonUtil.java

@@ -0,0 +1,55 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Pivotal, 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:
+ *     Pivotal, Inc. - initial API and implementation
+ *******************************************************************************/
+package org.springframework.ide.vscode.commons.util;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map.Entry;
+import java.util.Set;
+import java.util.stream.Stream;
+
+import com.google.gson.JsonElement;
+
+public class GsonUtil {
+	
+	public static Stream<JsonElement> getFromElements(JsonElement target) {
+		if (target.isJsonArray()) {
+			return Streams.fromIterable(target.getAsJsonArray());
+		} else if (target.isJsonObject()) {
+			List<JsonElement> vals = new ArrayList<>();
+			Set<Entry<String, JsonElement>> entrySet = target.getAsJsonObject().entrySet();
+			if (entrySet != null) {
+				for (Entry<String, JsonElement> entry : entrySet) {
+					vals.add(entry.getValue());
+				}
+			}
+			return vals.stream();
+		} else {
+			return Stream.empty();
+		}
+	}
+
+	public static Stream<JsonElement> getFromIndex(JsonElement target, int index) {
+		if (target.isJsonArray()) {
+			return Streams.fromNullable(target.getAsJsonArray().get(index));
+		} else {
+			return Stream.empty();
+		}
+	}
+
+	public static Stream<JsonElement> getFromKey(JsonElement target, String key) {
+		if (target.isJsonObject()) {
+			return Streams.fromNullable(target.getAsJsonObject().get(key));
+		} else {
+			return Stream.empty();
+		}
+	}
+}

headless-services/commons/commons-util/src/main/java/org/springframework/ide/vscode/commons/util/Streams.java

@@ -0,0 +1,42 @@
+/*******************************************************************************
+ * Copyright (c) 2016-2017 Pivotal, 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:
+ *     Pivotal, Inc. - initial API and implementation
+ *******************************************************************************/
+package org.springframework.ide.vscode.commons.util;
+
+import java.util.ArrayList;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+import java.util.stream.StreamSupport;
+
+public class Streams {
+
+	/**
+	 * Returns the element in the stream, if the stream has exactly one element.
+	 * Otherwise returns null
+	 */
+	public static <T> T getSingle(Stream<T> stream) {
+		ArrayList<T> els = stream
+				.limit(2) //Don't need more than 2 to know there is more than 1
+				.collect(Collectors.toCollection(() -> new ArrayList<>(2)));
+		return els.size()==1 ? els.get(0) : null;
+	}
+
+	/**
+	 * Like java.util.Stream.of but returns Stream.empty if the element is null
+	 */
+	public static <T> Stream<T> fromNullable(T e) {
+		return e==null ? Stream.empty() : Stream.of(e);
+	}
+
+	public static <T> Stream<T> fromIterable(Iterable<T> target) {
+		return StreamSupport.stream(target.spliterator(), false);
+	}
+
+}