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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 
     18 package android.filterfw.core;
     19 
     20 /**
     21  * @hide
     22  */
     23 public abstract class InputPort extends FilterPort {
     24 
     25     protected OutputPort mSourcePort;
     26 
     27     public InputPort(Filter filter, String name) {
     28         super(filter, name);
     29     }
     30 
     31     public void setSourcePort(OutputPort source) {
     32         if (mSourcePort != null) {
     33             throw new RuntimeException(this + " already connected to " + mSourcePort + "!");
     34         }
     35         mSourcePort = source;
     36     }
     37 
     38     public boolean isConnected() {
     39         return mSourcePort != null;
     40     }
     41 
     42     public void open() {
     43         super.open();
     44         if (mSourcePort != null && !mSourcePort.isOpen()) {
     45             mSourcePort.open();
     46         }
     47     }
     48 
     49     public void close() {
     50         if (mSourcePort != null && mSourcePort.isOpen()) {
     51             mSourcePort.close();
     52         }
     53         super.close();
     54     }
     55 
     56     public OutputPort getSourcePort() {
     57         return mSourcePort;
     58     }
     59 
     60     public Filter getSourceFilter() {
     61         return mSourcePort == null ? null : mSourcePort.getFilter();
     62     }
     63 
     64     public FrameFormat getSourceFormat() {
     65         return mSourcePort != null ? mSourcePort.getPortFormat() : getPortFormat();
     66     }
     67 
     68     public Object getTarget() {
     69         return null;
     70     }
     71 
     72     public boolean filterMustClose() {
     73         return !isOpen() && isBlocking() && !hasFrame();
     74     }
     75 
     76     public boolean isReady() {
     77         return hasFrame() || !isBlocking();
     78     }
     79 
     80     public boolean acceptsFrame() {
     81         return !hasFrame();
     82     }
     83 
     84     public abstract void transfer(FilterContext context);
     85 }
     86