[MaterialDatePicker] Added a DateValidator for a bounded range.

Resolves https://github.com/material-components/material-components-android/pull/972

GIT_ORIGIN_REV_ID=29cbbd569f5284f0bdf4cc1bdad60f93f92856eb

Co-authored-by: ymarian <38727469+ymarian@users.noreply.github.com>
PiperOrigin-RevId: 295810824

catalog/java/io/material/catalog/datepicker/DatePickerMainDemoFragment.java

@@ -30,11 +30,14 @@ import android.widget.LinearLayout;
 import android.widget.RadioGroup;
 import com.google.android.material.button.MaterialButton;
 import com.google.android.material.datepicker.CalendarConstraints;
+import com.google.android.material.datepicker.CompositeDateValidator;
 import com.google.android.material.datepicker.DateValidatorPointForward;
 import com.google.android.material.datepicker.MaterialDatePicker;
 import com.google.android.material.snackbar.Snackbar;
 import io.material.catalog.feature.DemoFragment;
+import java.util.ArrayList;
 import java.util.Calendar;
+import java.util.List;
 import java.util.TimeZone;
 
 /** A fragment that displays the main Picker demos for the Catalog app. */
@@ -190,6 +193,16 @@ public class DatePickerMainDemoFragment extends DemoFragment {
       constraintsBuilder.setValidator(DateValidatorPointForward.now());
     } else if (validationChoice == R.id.cat_picker_validation_weekdays) {
       constraintsBuilder.setValidator(new DateValidatorWeekdays());
+    } else if ((validationChoice == R.id.cat_picker_validation_last_two_weeks)) {
+      Calendar lowerBoundCalendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
+      lowerBoundCalendar.add(Calendar.DAY_OF_MONTH, -14);
+      long lowerBound = lowerBoundCalendar.getTimeInMillis();
+
+      List<CalendarConstraints.DateValidator> validators = new ArrayList<>();
+      validators.add(DateValidatorPointForward.from(lowerBound));
+      validators.add(new DateValidatorWeekdays());
+
+      constraintsBuilder.setValidator(CompositeDateValidator.allOf(validators));
     }
     return constraintsBuilder;
   }

catalog/java/io/material/catalog/datepicker/res/layout/cat_picker_validation.xml

@@ -33,7 +33,7 @@
       android:id="@+id/cat_picker_validation_group"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
-      android:orientation="horizontal">
+      android:orientation="vertical">
     <RadioButton
         android:id="@+id/cat_picker_validation_default"
         android:layout_width="wrap_content"
@@ -45,18 +45,20 @@
         android:id="@+id/cat_picker_validation_today_onward"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_marginStart="@dimen/cat_picker_demo_padding"
-        android:layout_marginLeft="@dimen/cat_picker_demo_padding"
         android:text="@string/cat_picker_validation_today_onward"
         android:textAppearance="?attr/textAppearanceBody1"/>
     <RadioButton
         android:id="@+id/cat_picker_validation_weekdays"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_marginStart="@dimen/cat_picker_demo_padding"
-        android:layout_marginLeft="@dimen/cat_picker_demo_padding"
         android:text="@string/cat_picker_validation_weekdays"
         android:textAppearance="?attr/textAppearanceBody1"/>
+    <RadioButton
+      android:id="@+id/cat_picker_validation_last_two_weeks"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:text="@string/cat_picker_validation_last_two_weeks"
+      android:textAppearance="?attr/textAppearanceBody1"/>
 
   </RadioGroup>
 </LinearLayout>

catalog/java/io/material/catalog/datepicker/res/values/strings.xml

@@ -65,6 +65,8 @@
   <string name="cat_picker_validation_today_onward">Today onward</string>
   <!-- Indicates that only weekdays will be valid [CHAR LIMIT=25] -->
   <string name="cat_picker_validation_weekdays">Weekdays</string>
+  <!-- Indicates that only the last 2 weeks will be valid [CHAR LIMIT=25] -->
+  <string name="cat_picker_validation_last_two_weeks">Last 2 weeks</string>
 
   <!-- Grouping label for a set of radio buttons that choose the title [CHAR LIMIT=50] -->
   <string name="cat_picker_title">Picker Title</string>

lib/java/com/google/android/material/datepicker/CompositeDateValidator.java

@@ -0,0 +1,113 @@
+/*
+ * Copyright 2019 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.google.android.material.datepicker;
+
+import static androidx.core.util.Preconditions.checkNotNull;
+
+import android.os.Parcel;
+import android.os.Parcelable;
+import androidx.annotation.NonNull;
+import com.google.android.material.datepicker.CalendarConstraints.DateValidator;
+import java.util.List;
+
+/** A {@link DateValidator} that accepts a list of Date Validators. */
+public final class CompositeDateValidator implements DateValidator {
+
+  @NonNull private final List<DateValidator> validators;
+
+  private CompositeDateValidator(@NonNull List<DateValidator> validators) {
+    this.validators = validators;
+  }
+
+  /**
+   * Returns a {@link DateValidator} that can perform validation for every given {@link
+   * #validators}.
+   */
+  @NonNull
+  public static DateValidator allOf(@NonNull List<DateValidator> validators) {
+    return new CompositeDateValidator(validators);
+  }
+
+  /** Part of {@link Parcelable} requirements. Do not use. */
+  public static final Creator<CompositeDateValidator> CREATOR =
+      new Creator<CompositeDateValidator>() {
+        @NonNull
+        @Override
+        public CompositeDateValidator createFromParcel(@NonNull Parcel source) {
+          @SuppressWarnings("unchecked")
+          List<DateValidator> validators =
+              source.readArrayList(DateValidator.class.getClassLoader());
+          return new CompositeDateValidator(checkNotNull(validators));
+        }
+
+        @NonNull
+        @Override
+        public CompositeDateValidator[] newArray(int size) {
+          return new CompositeDateValidator[size];
+        }
+      };
+
+  /**
+   * Performs the {@link DateValidator#isValid(long)} check as an AND of all validators in {@link
+   * #validators}. e.g. If every validator in this class returns `true` for each {@link
+   * DateValidator#isValid(long)}, this this method will return true.
+   *
+   * @param date milliseconds date to validate against.
+   * @return True, if the given date is valid for every given validator in this class.
+   */
+  @Override
+  public boolean isValid(long date) {
+    for (DateValidator validator : validators) {
+      if (validator == null) {
+        continue;
+      }
+      if (!validator.isValid(date)) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  @Override
+  public int describeContents() {
+    return 0;
+  }
+
+  @Override
+  public void writeToParcel(@NonNull Parcel dest, int flags) {
+    dest.writeList(validators);
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+
+    if (!(o instanceof CompositeDateValidator)) {
+      return false;
+    }
+
+    CompositeDateValidator that = (CompositeDateValidator) o;
+
+    return validators.equals(that.validators);
+  }
+
+  @Override
+  public int hashCode() {
+    return validators.hashCode();
+  }
+}

lib/javatests/com/google/android/material/datepicker/CompositeDateValidatorTest.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright 2020 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.google.android.material.datepicker;
+
+import com.google.android.material.R;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.os.Parcel;
+import com.google.android.material.datepicker.CalendarConstraints.DateValidator;
+import java.util.ArrayList;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+
+/** Test for {@link CompositeDateValidator} */
+@RunWith(RobolectricTestRunner.class)
+public class CompositeDateValidatorTest {
+
+  private DateValidator subject;
+
+  @Before
+  public void createSubject() {
+    DateValidator validator1 = DateValidatorPointBackward.before(5);
+    DateValidator validator2 = DateValidatorPointForward.from(2);
+
+    ArrayList<DateValidator> validators = new ArrayList<>(2);
+    validators.add(validator1);
+    validators.add(validator2);
+
+    subject = CompositeDateValidator.allOf(validators);
+  }
+
+  @Test
+  public void testValidDate() {
+    assertThat(subject.isValid(4)).isTrue();
+  }
+
+  @Test
+  public void testInvalidDate() {
+    assertThat(subject.isValid(1)).isFalse();
+    assertThat(subject.isValid(6)).isFalse();
+  }
+
+  @Test
+  public void testParcelable() {
+    DateValidator original = subject;
+
+    Parcel parcel = Parcel.obtain();
+    original.writeToParcel(parcel, 0);
+    parcel.setDataPosition(0);
+
+    DateValidator createdFromParcel = CompositeDateValidator.CREATOR.createFromParcel(parcel);
+    assertThat(original).isEqualTo(createdFromParcel);
+  }
+}