| /* |
| * Copyright (C) 2011 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 android.filterfw.core; |
| |
| import java.lang.reflect.Field; |
| |
| /** |
| * @hide |
| */ |
| public class FieldPort extends InputPort { |
| |
| protected Field mField; |
| protected boolean mHasFrame; |
| protected boolean mValueWaiting = false; |
| protected Object mValue; |
| |
| public FieldPort(Filter filter, String name, Field field, boolean hasDefault) { |
| super(filter, name); |
| mField = field; |
| mHasFrame = hasDefault; |
| } |
| |
| @Override |
| public void clear() { |
| } |
| |
| @Override |
| public void pushFrame(Frame frame) { |
| setFieldFrame(frame, false); |
| } |
| |
| @Override |
| public void setFrame(Frame frame) { |
| setFieldFrame(frame, true); |
| } |
| |
| @Override |
| public Object getTarget() { |
| try { |
| return mField.get(mFilter); |
| } catch (IllegalAccessException e) { |
| return null; |
| } |
| } |
| |
| @Override |
| public synchronized void transfer(FilterContext context) { |
| if (mValueWaiting) { |
| try { |
| mField.set(mFilter, mValue); |
| } catch (IllegalAccessException e) { |
| throw new RuntimeException( |
| "Access to field '" + mField.getName() + "' was denied!"); |
| } |
| mValueWaiting = false; |
| if (context != null) { |
| mFilter.notifyFieldPortValueUpdated(mName, context); |
| } |
| } |
| } |
| |
| @Override |
| public synchronized Frame pullFrame() { |
| throw new RuntimeException("Cannot pull frame on " + this + "!"); |
| } |
| |
| @Override |
| public synchronized boolean hasFrame() { |
| return mHasFrame; |
| } |
| |
| @Override |
| public synchronized boolean acceptsFrame() { |
| return !mValueWaiting; |
| } |
| |
| @Override |
| public String toString() { |
| return "field " + super.toString(); |
| } |
| |
| protected synchronized void setFieldFrame(Frame frame, boolean isAssignment) { |
| assertPortIsOpen(); |
| checkFrameType(frame, isAssignment); |
| |
| // Store the object value |
| Object value = frame.getObjectValue(); |
| if ((value == null && mValue != null) || !value.equals(mValue)) { |
| mValue = value; |
| mValueWaiting = true; |
| } |
| |
| // Since a frame was set, mark this port as having a frame to pull |
| mHasFrame = true; |
| } |
| } |