1 files changed, 170 insertions, 0 deletions
diff --git a/java/com/android/contacts/common/list/ContactListFilterController.java b/java/com/android/contacts/common/list/ContactListFilterController.java
new file mode 100644
index 000000000..d2168f3f2
--- /dev/null
+++ b/java/com/android/contacts/common/list/ContactListFilterController.java
@@ -0,0 +1,170 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * 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 com.android.contacts.common.list;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.preference.PreferenceManager;
+import com.android.contacts.common.model.AccountTypeManager;
+import com.android.contacts.common.model.account.AccountWithDataSet;
+import java.util.ArrayList;
+import java.util.List;
+
+/** Manages {@link ContactListFilter}. All methods must be called from UI thread. */
+public abstract class ContactListFilterController {
+
+  // singleton to cache the filter controller
+  private static ContactListFilterControllerImpl sFilterController = null;
+
+  public static ContactListFilterController getInstance(Context context) {
+    // We may need to synchronize this in the future if background task will call this.
+    if (sFilterController == null) {
+      sFilterController = new ContactListFilterControllerImpl(context);
+    }
+    return sFilterController;
+  }
+
+  public abstract void addListener(ContactListFilterListener listener);
+
+  public abstract void removeListener(ContactListFilterListener listener);
+
+  /** Return the currently-active filter. */
+  public abstract ContactListFilter getFilter();
+
+  /**
+   * @param filter the filter
+   * @param persistent True when the given filter should be saved soon. False when the filter should
+   *     not be saved. The latter case may happen when some Intent requires a certain type of UI
+   *     (e.g. single contact) temporarily.
+   */
+  public abstract void setContactListFilter(ContactListFilter filter, boolean persistent);
+
+  public abstract void selectCustomFilter();
+
+  /**
+   * Checks if the current filter is valid and reset the filter if not. It may happen when an
+   * account is removed while the filter points to the account with {@link
+   * ContactListFilter#FILTER_TYPE_ACCOUNT} type, for example. It may also happen if the current
+   * filter is {@link ContactListFilter#FILTER_TYPE_SINGLE_CONTACT}, in which case, we should switch
+   * to the last saved filter in {@link SharedPreferences}.
+   */
+  public abstract void checkFilterValidity(boolean notifyListeners);
+
+  public interface ContactListFilterListener {
+
+    void onContactListFilterChanged();
+  }
+}
+
+/**
+ * Stores the {@link ContactListFilter} selected by the user and saves it to {@link
+ * SharedPreferences} if necessary.
+ */
+class ContactListFilterControllerImpl extends ContactListFilterController {
+
+  private final Context mContext;
+  private final List<ContactListFilterListener> mListeners =
+      new ArrayList<ContactListFilterListener>();
+  private ContactListFilter mFilter;
+
+  public ContactListFilterControllerImpl(Context context) {
+    mContext = context;
+    mFilter = ContactListFilter.restoreDefaultPreferences(getSharedPreferences());
+    checkFilterValidity(true /* notify listeners */);
+  }
+
+  @Override
+  public void addListener(ContactListFilterListener listener) {
+    mListeners.add(listener);
+  }
+
+  @Override
+  public void removeListener(ContactListFilterListener listener) {
+    mListeners.remove(listener);
+  }
+
+  @Override
+  public ContactListFilter getFilter() {
+    return mFilter;
+  }
+
+  private SharedPreferences getSharedPreferences() {
+    return PreferenceManager.getDefaultSharedPreferences(mContext);
+  }
+
+  @Override
+  public void setContactListFilter(ContactListFilter filter, boolean persistent) {
+    setContactListFilter(filter, persistent, true);
+  }
+
+  private void setContactListFilter(
+      ContactListFilter filter, boolean persistent, boolean notifyListeners) {
+    if (!filter.equals(mFilter)) {
+      mFilter = filter;
+      if (persistent) {
+        ContactListFilter.storeToPreferences(getSharedPreferences(), mFilter);
+      }
+      if (notifyListeners && !mListeners.isEmpty()) {
+        notifyContactListFilterChanged();
+      }
+    }
+  }
+
+  @Override
+  public void selectCustomFilter() {
+    setContactListFilter(
+        ContactListFilter.createFilterWithType(ContactListFilter.FILTER_TYPE_CUSTOM), true);
+  }
+
+  private void notifyContactListFilterChanged() {
+    for (ContactListFilterListener listener : mListeners) {
+      listener.onContactListFilterChanged();
+    }
+  }
+
+  @Override
+  public void checkFilterValidity(boolean notifyListeners) {
+    if (mFilter == null) {
+      return;
+    }
+
+    switch (mFilter.filterType) {
+      case ContactListFilter.FILTER_TYPE_SINGLE_CONTACT:
+        setContactListFilter(
+            ContactListFilter.restoreDefaultPreferences(getSharedPreferences()),
+            false,
+            notifyListeners);
+        break;
+      case ContactListFilter.FILTER_TYPE_ACCOUNT:
+        if (!filterAccountExists()) {
+          // The current account filter points to invalid account. Use "all" filter
+          // instead.
+          setContactListFilter(
+              ContactListFilter.createFilterWithType(ContactListFilter.FILTER_TYPE_ALL_ACCOUNTS),
+              true,
+              notifyListeners);
+        }
+    }
+  }
+
+  /** @return true if the Account for the current filter exists. */
+  private boolean filterAccountExists() {
+    final AccountTypeManager accountTypeManager = AccountTypeManager.getInstance(mContext);
+    final AccountWithDataSet filterAccount =
+        new AccountWithDataSet(mFilter.accountName, mFilter.accountType, mFilter.dataSet);
+    return accountTypeManager.contains(filterAccount, false);
+  }
+}