am ac50c3ae: ADT XML extract string IDs: display existing IDs of the selected file.

Merge commit 'ac50c3aedfd4e18a3770315708ac4de47906eec4'

* commit 'ac50c3aedfd4e18a3770315708ac4de47906eec4':
  ADT XML extract string IDs: display existing IDs of the

tools/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/refactorings/extractstring/ExtractStringInputPage.java

@@ -33,6 +33,8 @@ import org.eclipse.ltk.ui.refactoring.UserInputWizardPage;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.ModifyEvent;
 import org.eclipse.swt.events.ModifyListener;
+import org.eclipse.swt.events.SelectionAdapter;
+import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Combo;
@@ -42,6 +44,7 @@ import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Text;
 
 import java.util.HashMap;
+import java.util.Set;
 import java.util.TreeSet;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -59,7 +62,7 @@ class ExtractStringInputPage extends UserInputWizardPage implements IWizardPage
     private final IProject mProject;
 
     /** Text field where the user enters the new ID to be generated or replaced with. */
-    private Text mStringIdField;
+    private Combo mStringIdCombo;
     /** Text field where the user enters the new string value. */
     private Text mStringValueField;
     /** The configuration selector, to select the resource path of the XML file. */
@@ -163,18 +166,24 @@ class ExtractStringInputPage extends UserInputWizardPage implements IWizardPage
             label.setText("ID &R.string.");
         }
 
-        mStringIdField = new Text(group, SWT.SINGLE | SWT.LEFT | SWT.BORDER);
+        mStringIdCombo = new Combo(group, SWT.SINGLE | SWT.LEFT | SWT.BORDER | SWT.DROP_DOWN);
-        mStringIdField.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
+        mStringIdCombo.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
-        mStringIdField.setText(guessId(selectedString));
+        mStringIdCombo.setText(guessId(selectedString));
-        mStringIdField.forceFocus();
+        mStringIdCombo.forceFocus();
 
-        ref.setNewStringId(mStringIdField.getText().trim());
+        ref.setNewStringId(mStringIdCombo.getText().trim());
 
-        mStringIdField.addModifyListener(new ModifyListener() {
+        mStringIdCombo.addModifyListener(new ModifyListener() {
             public void modifyText(ModifyEvent e) {
                 validatePage();
             }
         });
+        mStringIdCombo.addSelectionListener(new SelectionAdapter() {
+            @Override
+            public void widgetSelected(SelectionEvent e) {
+                validatePage();
+            }
+        });
     }
 
     /**
@@ -270,7 +279,7 @@ class ExtractStringInputPage extends UserInputWizardPage implements IWizardPage
 
         // Analyze fatal errors.
 
-        String text = mStringIdField.getText().trim();
+        String text = mStringIdCombo.getText().trim();
         if (text == null || text.length() < 1) {
             setErrorMessage("Please provide a resource ID.");
             success = false;
@@ -342,6 +351,23 @@ class ExtractStringInputPage extends UserInputWizardPage implements IWizardPage
         return success;
     }
 
+    private void updateStringValueCombo() {
+        String resFile = mResFileCombo.getText();
+        Set<String> ids = mXmlHelper.getResIdsForFile(mProject, resFile);
+
+        // get the current text from the combo, to make sure we don't change it
+        String currText = mStringIdCombo.getText();
+
+        // erase the choices and fill with the given ids
+        mStringIdCombo.removeAll();
+        mStringIdCombo.setItems(ids.toArray(new String[ids.size()]));
+
+        // set the current text to preserve it in case it changed
+        if (!currText.equals(mStringIdCombo.getText())) {
+            mStringIdCombo.setText(currText);
+        }
+    }
+
     public class OnConfigSelectorUpdated implements Runnable, ModifyListener {
 
         /** Regex pattern to parse a valid res path: it reads (/res/folder-name/)+(filename). */
@@ -458,6 +484,7 @@ class ExtractStringInputPage extends UserInputWizardPage implements IWizardPage
             }
 
             // finally validate the whole page
+            updateStringValueCombo();
             validatePage();
         }
 
@@ -510,6 +537,7 @@ class ExtractStringInputPage extends UserInputWizardPage implements IWizardPage
                 }
             }
 
+            updateStringValueCombo();
             validatePage();
         }
     }

tools/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/refactorings/extractstring/XmlStringFileHelper.java

@@ -26,20 +26,21 @@ import org.w3c.dom.NodeList;
 import org.xml.sax.InputSource;
 
 import java.util.HashMap;
-import java.util.HashSet;
+import java.util.Set;
+import java.util.TreeSet;
 
 import javax.xml.xpath.XPath;
 import javax.xml.xpath.XPathConstants;
 import javax.xml.xpath.XPathExpressionException;
 
 /**
- * 
+ * An helper utility to get IDs out of an Android XML resource file.
  */
 class XmlStringFileHelper {
 
     /** A temporary cache of R.string IDs defined by a given xml file. The key is the
      * project path of the file, the data is a set of known string Ids for that file. */
-    private HashMap<String,HashSet<String>> mResIdCache;
+    private HashMap<String, Set<String>> mResIdCache = new HashMap<String, Set<String>>();
     /** An instance of XPath, created lazily on demand. */
     private XPath mXPath;
 
@@ -57,18 +58,27 @@ class XmlStringFileHelper {
      * @return True if such a string ID is already defined.
      */
     public boolean isResIdDuplicate(IProject project, String xmlFileWsPath, String stringId) {
-        // This is going to be called many times on the same file.
+        Set<String> cache = getResIdsForFile(project, xmlFileWsPath);
-        // Build a cache of the existing IDs for a given file.
+        return cache.contains(stringId);
-        if (mResIdCache == null) {
-            mResIdCache = new HashMap<String, HashSet<String>>();
-        }
-        HashSet<String> cache = mResIdCache.get(xmlFileWsPath);
-        if (cache == null) {
-            cache = getResIdsForFile(project, xmlFileWsPath);
-            mResIdCache.put(xmlFileWsPath, cache);
     }
 
-        return cache.contains(stringId);
+    /**
+     * Utility method that retrieves all the *string* IDs defined in the given Android resource
+     * file. The instance maintains an internal cache so a given file is retrieved only once.
+     * Callers should consider the set to be read-only.
+     *
+     * @param project The project contain the XML file.
+     * @param xmlFileWsPath The project path of the XML file, e.g. "/res/values/strings.xml".
+     *          The given file may or may not exist.
+     * @return The set of string IDs defined in the given file. Cached. Never null.
+     */
+    public Set<String> getResIdsForFile(IProject project, String xmlFileWsPath) {
+        Set<String> cache = mResIdCache.get(xmlFileWsPath);
+        if (cache == null) {
+            cache = internalGetResIdsForFile(project, xmlFileWsPath);
+            mResIdCache.put(xmlFileWsPath, cache);
+        }
+        return cache;
     }
 
     /**
@@ -78,8 +88,8 @@ class XmlStringFileHelper {
      * @return The set of all string IDs defined in the file. The returned set is always non
      *   null. It is empty if the file does not exist.
      */
-    private HashSet<String> getResIdsForFile(IProject project, String xmlFileWsPath) {
+    private Set<String> internalGetResIdsForFile(IProject project, String xmlFileWsPath) {
-        HashSet<String> ids = new HashSet<String>();
+        TreeSet<String> ids = new TreeSet<String>();
 
         if (mXPath == null) {
             mXPath = AndroidXPathFactory.newXPath();