Convert to gradle build system

1 files changed, 159 insertions, 0 deletions

diff --git a/app/src/main/java/org/connectbot/service/PromptHelper.java b/app/src/main/java/org/connectbot/service/PromptHelper.java
new file mode 100644
index 0000000..f0a37be
--- /dev/null
+++ b/app/src/main/java/org/connectbot/service/PromptHelper.java
@@ -0,0 +1,159 @@
+/*
+ * ConnectBot: simple, powerful, open-source SSH client for Android
+ * Copyright 2007 Kenny Root, Jeffrey Sharkey
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.connectbot.service;
+
+import java.util.concurrent.Semaphore;
+
+import android.os.Handler;
+import android.os.Message;
+
+/**
+ * Helps provide a relay for prompts and responses between a possible user
+ * interface and some underlying service.
+ *
+ * @author jsharkey
+ */
+public class PromptHelper {
+	private final Object tag;
+
+	private Handler handler = null;
+
+	private Semaphore promptToken;
+	private Semaphore promptResponse;
+
+	public String promptInstructions = null;
+	public String promptHint = null;
+	public Object promptRequested = null;
+
+	private Object response = null;
+
+	public PromptHelper(Object tag) {
+		this.tag = tag;
+
+		// Threads must acquire this before they can send a prompt.
+		promptToken = new Semaphore(1);
+
+		// Responses will release this semaphore.
+		promptResponse = new Semaphore(0);
+	}
+
+
+	/**
+	 * Register a user interface handler, if available.
+	 */
+	public void setHandler(Handler handler) {
+		this.handler = handler;
+	}
+
+	/**
+	 * Set an incoming value from an above user interface. Will automatically
+	 * notify any waiting requests.
+	 */
+	public void setResponse(Object value) {
+		response = value;
+		promptRequested = null;
+		promptInstructions = null;
+		promptHint = null;
+		promptResponse.release();
+	}
+
+	/**
+	 * Return the internal response value just before erasing and returning it.
+	 */
+	protected Object popResponse() {
+		Object value = response;
+		response = null;
+		return value;
+	}
+
+
+	/**
+	 * Request a prompt response from parent. This is a blocking call until user
+	 * interface returns a value.
+	 * Only one thread can call this at a time. cancelPrompt() will force this to
+	 * immediately return.
+	 */
+	private Object requestPrompt(String instructions, String hint, Object type) throws InterruptedException {
+		Object response = null;
+
+		promptToken.acquire();
+
+		try {
+			promptInstructions = instructions;
+			promptHint = hint;
+			promptRequested = type;
+
+			// notify any parent watching for live events
+			if (handler != null)
+				Message.obtain(handler, -1, tag).sendToTarget();
+
+			// acquire lock until user passes back value
+			promptResponse.acquire();
+
+			response = popResponse();
+		} finally {
+			promptToken.release();
+		}
+
+		return response;
+	}
+
+	/**
+	 * Request a string response from parent. This is a blocking call until user
+	 * interface returns a value.
+	 * @param hint prompt hint for user to answer
+	 * @return string user has entered
+	 */
+	public String requestStringPrompt(String instructions, String hint) {
+		String value = null;
+		try {
+			value = (String)this.requestPrompt(instructions, hint, String.class);
+		} catch(Exception e) {
+		}
+		return value;
+	}
+
+	/**
+	 * Request a boolean response from parent. This is a blocking call until user
+	 * interface returns a value.
+	 * @param hint prompt hint for user to answer
+	 * @return choice user has made (yes/no)
+	 */
+	public Boolean requestBooleanPrompt(String instructions, String hint) {
+		Boolean value = null;
+		try {
+			value = (Boolean)this.requestPrompt(instructions, hint, Boolean.class);
+		} catch(Exception e) {
+		}
+		return value;
+	}
+
+	/**
+	 * Cancel an in-progress prompt.
+	 */
+	public void cancelPrompt() {
+		if (!promptToken.tryAcquire()) {
+			// A thread has the token, so try to interrupt it
+			response = null;
+			promptResponse.release();
+		} else {
+			// No threads have acquired the token
+			promptToken.release();
+		}
+	}
+}