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.filterpacks.text; 19 20 import android.filterfw.core.Filter; 21 import android.filterfw.core.FilterContext; 22 import android.filterfw.core.Frame; 23 import android.filterfw.core.FrameFormat; 24 import android.filterfw.core.GenerateFieldPort; 25 import android.filterfw.core.KeyValueMap; 26 import android.filterfw.core.MutableFrameFormat; 27 import android.filterfw.format.ObjectFormat; 28 29 /** 30 * @hide 31 */ 32 public class StringSource extends Filter { 33 34 @GenerateFieldPort(name = "stringValue") 35 private String mString; 36 37 private FrameFormat mOutputFormat; 38 39 public StringSource(String name) { 40 super(name); 41 } 42 43 @Override 44 public void setupPorts() { 45 mOutputFormat = ObjectFormat.fromClass(String.class, FrameFormat.TARGET_SIMPLE); 46 addOutputPort("string", mOutputFormat); 47 } 48 49 @Override 50 public void process(FilterContext env) { 51 Frame output = env.getFrameManager().newFrame(mOutputFormat); 52 output.setObjectValue(mString); 53 output.setTimestamp(Frame.TIMESTAMP_UNKNOWN); 54 pushOutput("string", output); 55 closeOutputPort("string"); 56 } 57 58 59 } 60