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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 {
protected final Object tag;
public PromptHelper(Object tag) {
this.tag = tag;
}
protected Handler handler = null;
/**
* Register a user interface handler, if available.
*/
public void setHandler(Handler handler) {
this.handler = handler;
}
protected Semaphore promptResponse = new Semaphore(0);
public String promptHint = null;
public Object promptRequested = null;
protected Object response = null;
/**
* Set an incoming value from an above user interface. Will automatically
* notify any waiting requests.
*/
public void setResponse(Object value) {
this.response = value;
this.promptResponse.release();
}
/**
* Return the internal response value just before erasing and returning it.
*/
protected Object popResponse() {
Object value = this.response;
this.response = null;
return value;
}
/**
* Request a prompt response from parent. This is a blocking call until user
* interface returns a value.
*/
public synchronized Object requestPrompt(String hint, Object type) throws Exception {
this.promptHint = hint;
this.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
this.promptResponse.acquire();
this.promptRequested = null;
return this.popResponse();
}
/**
* Request a string response from parent. This is a blocking call until user
* interface returns a value.
*/
public String requestStringPrompt(String hint) {
String value = null;
try {
value = (String)this.requestPrompt(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.
*/
public Boolean requestBooleanPrompt(String hint) {
Boolean value = null;
try {
value = (Boolean)this.requestPrompt(hint, Boolean.class);
} catch(Exception e) {
}
return value;
}
}
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