/*
* $Id$
*
* Copyright (C) 2003-2014 JNode.org
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.configure;
import java.util.ArrayList;
import java.util.List;
import org.jnode.configure.PropertySet.Value;
/**
* This class represents a 'screen' that sets a number of properties.
*
* @author crawley@jnode.org
*/
public class Screen {
public static class Item {
private final ConfigureScript script;
private final String propName;
private final String text;
private final String changed;
public Item(ConfigureScript script, String propName, String text, String changed) {
this.script = script;
this.propName = propName;
this.text = text;
this.changed = changed;
}
public ConfigureScript getScript() {
return script;
}
public String getPropName() {
return propName;
}
public String getText() {
return text;
}
public String getChanged() {
return changed;
}
}
private final String title;
private final String guardProp;
private final Value valueIs;
private final Value valueIsNot;
private final List<Item> items = new ArrayList<Item>();
public Screen(String title, String guardProp, Value valueIs, Value valueIsNot) {
this.title = title;
this.guardProp = guardProp;
this.valueIs = valueIs;
this.valueIsNot = valueIsNot;
}
public String getTitle() {
return title;
}
public String getGuardProp() {
return guardProp;
}
public Value getValueIs() {
return valueIs;
}
public Value getValueIsNot() {
return valueIsNot;
}
public List<Item> getItems() {
return items;
}
public void addItem(Item item) {
items.add(item);
}
/**
* Test to see if this script is executable (yet). A screen is executable if
* it has no guard property, or its guard property is set, and has the
* appropriate value. Note that we test using the PropertyValue's 'value'
* attribute, not the 'token' attribute.
*
* @param script this gives us the context for property lookup
* @return <code>true</code> if the screen is executable, <code>false</code> otherwise.
*/
public boolean isExecutable(ConfigureScript script) {
if (guardProp == null) {
return true;
}
PropertySet.Property prop = script.getProperty(guardProp);
if (!prop.isSet()) {
return false;
}
Value value = prop.getValue();
if (valueIs != null) {
return valueIs.getText().equals(value.getText());
} else if (valueIsNot != null) {
return !valueIsNot.getText().equals(value.getText());
} else {
return true;
}
}
public void execute(Configure configure, ConfigureScript script) throws ConfigureException {
configure.output("");
configure.output(title, Configure.DISPLAY_HIGHLIGHT);
// Process the items in order
for (Item item : items) {
// Output the item text if provided.
String text = item.getText();
if (text != null) {
if (text.endsWith("\n")) {
text = text.substring(0, text.length() - 1);
}
configure.output(text);
}
// Capture the value for the item property
PropertySet.Property prop = script.getProperty(item.getPropName());
Value value = null;
Value defaultValue = prop.getDefaultValue();
do {
String info = prop.getType().describe(defaultValue);
String input = configure.input(prop.getDescription() + " " + info + ":");
if (input == null) {
throw new ConfigureException("Unexpected EOF on input");
}
if (input.length() == 0) {
if (defaultValue != null) {
configure.debug("Using default");
value = defaultValue;
}
} else {
value = prop.getType().fromInput(input);
}
// Loop until we get a permissible value.
} while (value == null);
prop.setValue(value);
configure.output("");
if (item.getChanged() != null) {
// Display message if property value has changed.
String oldValue = (defaultValue == null) ? "" : defaultValue.getText();
String newValue = value.getText();
if (!oldValue.equals(newValue)) {
configure.output(item.getChanged());
configure.output("");
}
}
if (!prop.isControlProperty()) {
configure.verbose(
"Setting property " + prop.getName() + " to " +
"\"" + value.getText() + "\"");
}
}
}
}