Android Open Source - AndroidPlugin Reflect Field Accessor

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License

The source code is released under:

MIT License

Java Source Code

package com.limemobile.app.plugin.internal;
/*from  w w w.j a v a  2 s .c  o m*/
import java.lang.reflect.Field;

public class ReflectFieldAccessor<T> {
  private Object mObject;
  private String mFieldName;

  private boolean isInited;
  private Field mField;

  public ReflectFieldAccessor(Object obj, String fieldName) {
    if (obj == null) {
      throw new IllegalArgumentException("obj cannot be null");
    }
    this.mObject = obj;
    this.mFieldName = fieldName;
  }

  private void prepare() {
    if (isInited)
      return;
    isInited = true;

    Class<?> c = mObject.getClass();
    while (c != null) {
      try {
        Field f = c.getDeclaredField(mFieldName);
        f.setAccessible(true);
        mField = f;
        return;
      } catch (Exception e) {
      } finally {
        c = c.getSuperclass();
      }
    }
  }

  public T get() throws NoSuchFieldException, IllegalAccessException,
      IllegalArgumentException {
    prepare();

    if (mField == null)
      throw new NoSuchFieldException();

    try {
      @SuppressWarnings("unchecked")
      T r = (T) mField.get(mObject);
      return r;
    } catch (ClassCastException e) {
      throw new IllegalArgumentException("unable to cast object");
    }
  }

  public void set(T val) throws NoSuchFieldException, IllegalAccessException,
      IllegalArgumentException {
    prepare();

    if (mField == null)
      throw new NoSuchFieldException();

    mField.set(mObject, val);
  }
}

Java Source Code List

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