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/*
* Braille Utils (C) 2010-2011 Daisy Consortium
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at your option)
* any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.daisy.dotify.cli;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.util.List;
import java.util.prefs.BackingStoreException;
import java.util.prefs.Preferences;
import org.daisy.dotify.api.factory.FactoryProperties;
/**
* Provides a command line input helper for setting arguments interactively and
* storing them in the users preferences.
* @author Joel Håkansson
*/
public class InputHelper {
private Preferences pr;
private LineNumberReader ln;
/**
* Creates a new InputHelper for the specified class. The package name
* for the specified class will be used to locate an appropriate storage
* location in the user preferences.
* @param c the class to create a InputHelper for
*/
public InputHelper(@SuppressWarnings("rawtypes") Class c) {
pr = Preferences.userNodeForPackage(c);
ln = new LineNumberReader(new InputStreamReader(System.in));
}
/**
* Creates a new InputHelper with the default storage location (determined by
* the calling class's package name)
*/
public InputHelper() {
// Determining the calling class.
// ca[0] is the anonymous security manager
// ca[1] is this class
// ca[2] is the calling class
this((new SecurityManager() { @SuppressWarnings("rawtypes")
@Override
public Class[] getClassContext() { return super.getClassContext(); }}.getClassContext())[2]
);
}
/**
* Selects the value for a key.
* @param key the key to select a value for
* @param select the list of available values
* @param name a display name for the key
* @param verify if true, and no value is found, lets user select a value
* @return returns the value for the key.
*/
public String select(String key, String[] select, String name, boolean verify) {
String value = getKey(key);
if (value!=null) {
// check value
boolean ok = false;
for (String s : select) {
if (value.equals(s)) {
ok = true;
break;
}
}
if (!ok) {
// reset value
value = null;
}
}
if (value==null || verify) {
// ask user
System.out.println("Choose " + name + ": ");
int i = 1;
for (String s : select) {
System.out.print(i + ". " + s);
if (value!=null && s.equals(value)) {
System.out.print(" (current value, hit enter to keep this value)");
}
System.out.println();
i++;
}
int sel;
try {
sel = getInput(value!=null)-1;
} catch (IOException e) {
throw new RuntimeException(e);
}
if (sel==-1 && value!=null) {
return value;
} else if (sel<0) {
throw new RuntimeException("Exception");
}
value = select[sel];
pr.put(key, value);
}
return value;
}
/**
* Selects the value for a key.
* @param key the key to get a value for
* @param select the list of available values
* @param name the display name for the key
* @param verify if true, and no value is found, lets user select a value
* @return returns the value for the key.
*/
public String select(String key, List select, String name, boolean verify) {
String value = getKey(key);
if (value!=null) {
// check value
boolean ok = false;
for (FactoryProperties s : select) {
if (value.equals(s.getIdentifier())) {
ok = true;
break;
}
}
if (!ok) {
// reset value
value = null;
}
}
if (value==null || verify) {
// ask user
System.out.println("Choose " + name + ": ");
int i = 1;
for (FactoryProperties s : select) {
System.out.print(i + ". " + s.getDisplayName());
if (value!=null && s.getIdentifier().equals(value)) {
System.out.print(" (current value, hit enter to keep this value)");
}
System.out.println();
i++;
}
int sel;
try {
sel = getInput(value!=null)-1;
} catch (IOException e) {
throw new RuntimeException(e);
}
if (sel==-1 && value!=null) {
return value;
} else if (sel<0) {
throw new RuntimeException("Exception");
}
value = select.get(sel).getIdentifier();
pr.put(key, value);
}
return value;
}
/**
* Gets the value for a key.
* @param key the key to get a value for
* @return returns the value for the key
*/
public String getKey(String key) {
return pr.get(key, null);
}
/**
* Gets a integer from user. The assumption is that this value should be a non-zero
* positive integer, that is the user selects a value from a list starting with one.
* If the input is an empty string, 0 is returned. If an IO error occurs, -1 is returned.
* @param allowEnter set to true to return 0 if input is empty, false to retry if input is empty
* @return returns the integer value suppled by the user on the command line.
* @throws IOException if IO fails.
*/
public int getInput(boolean allowEnter) throws IOException {
while (true) {
System.out.print("Input: ");
String line = ln.readLine();
try {
if (line.equals("") && allowEnter) {
return 0;
} else {
return Integer.parseInt(line);
}
} catch (NumberFormatException e) {
System.out.println("Not a number: '" + line + "'");
}
}
}
public double getDouble(String msg, String key, boolean verify) throws IOException {
Double ret = null;
if (getKey(key)!=null) {
// check value
try {
ret = Double.valueOf(getKey(key));
} catch (NumberFormatException e) { }
}
if (ret==null || verify) {
// ask user
while (true) {
System.out.print(msg+ (ret!=null?" (current value "+ ret + ")":"") + " : ");
String line = ln.readLine();
if (ret!=null && "".equals(line)) {
pr.put(key, ret+"");
break;
} else {
try {
ret = Double.parseDouble(line);
pr.put(key, ret+"");
break;
} catch (NumberFormatException e) {
System.out.println("Not a number: '" + line + "'");
}
}
}
}
return ret;
}
public boolean getBoolean(String msg, String key, boolean verify) throws IOException {
Boolean ret = null;
if (getKey(key)!=null) {
ret = Boolean.valueOf(getKey(key));
}
if (ret==null || verify) {
// ask user
while (true) {
System.out.print(msg+" (y/n): ");
String line = ln.readLine();
if (ret!=null && "".equals(line)) {
pr.put(key, ret+"");
break;
} else {
if ("y".equalsIgnoreCase(line)) {
ret = true;
pr.put(key, ret+"");
break;
} else if ("n".equalsIgnoreCase(line)) {
ret = false;
pr.put(key, ret+"");
break;
}
System.out.println("Not a valid input: '" + line + "'");
}
}
}
return ret;
}
/**
* Clears the settings associated with this object from storage.
* @throws BackingStoreException if this operation cannot be completed
* due to a failure in the backing store, or inability to communicate with it.
* @throws IllegalStateException if the associated node (or an ancestor) has
* been removed with the removeNode() method.
*/
public void clearSettings() throws BackingStoreException {
pr.clear();
pr.flush();
}
}
