Android Open Source - geoar-app Number Settings View Field

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License

The source code is released under:

Apache License

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Java Source Code

/**
 * Copyright 2012 52North Initiative for Geospatial Open Source Software GmbH
 *//from   w  ww .  j a  v  a 2 s .  c o m
 * 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 org.n52.geoar.settings;

import java.lang.reflect.Field;

import org.n52.geoar.newdata.Annotations.Settings.Max;
import org.n52.geoar.newdata.Annotations.Settings.Min;
import org.n52.geoar.newdata.Annotations.Settings.NotNull;

import android.content.Context;
import android.view.View;
import android.widget.EditText;

public abstract class NumberSettingsViewField<T extends Number> extends EditText
    implements SettingsViewField<T> {

  private boolean notNull;
  private T minValue;
  private T maxValue;
  private Field field;

  public NumberSettingsViewField(Context context, Field field, int inputType) {
    super(context);
    this.field = field;
    // Check annotations
    notNull = field.isAnnotationPresent(NotNull.class);

    if (field.isAnnotationPresent(Min.class)) {
      minValue = parseString(field.getAnnotation(Min.class).value());
    }
    if (field.isAnnotationPresent(Max.class)) {
      maxValue = parseString(field.getAnnotation(Max.class).value());
    }
    setInputType(inputType);
  }

  @Override
  public Field getField() {
    return field;
  }

  @Override
  public boolean validate() {
    if (getText().toString().isEmpty() && !notNull) {
      return true;
    }
    T value;
    try {
      value = getValue();
    } catch (NumberFormatException e) {
      setError("Invalid Number");
      return false;
    }

    if (minValue != null && minValue.doubleValue() > value.doubleValue()) {
      setError("Must be at least " + minValue);
      return false;
    }
    if (maxValue != null && maxValue.doubleValue() < value.doubleValue()) {
      setError("Must be less than " + maxValue);
      return false;
    }

    return true;
  }

  @Override
  public T getValue() {
    if (getText().toString().isEmpty() && !notNull)
      return null;

    return parseString(getText().toString());
  }

  protected abstract T parseString(String value);

  @Override
  public void setValue(T value) {
    setText(value != null ? value + "" : "");
  }

  @Override
  public void setValueObject(Object object) {
    setValue((T) object);
  }

  @Override
  public View getView() {
    return this;
  }
}

Java Source Code List