1 | /*
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2 | * Copyright 2001-2004 The Apache Software Foundation
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | *
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16 | */
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17 |
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18 | package org.apache.tools.ant.taskdefs.optional.perforce;
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19 |
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20 | import java.io.ByteArrayInputStream;
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21 | import java.io.IOException;
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22 | import java.io.InputStream;
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23 | import java.io.OutputStream;
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24 |
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25 | import org.apache.tools.ant.BuildException;
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26 | import org.apache.tools.ant.taskdefs.PumpStreamHandler;
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27 | /**
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28 | * base class to manage streams around the execution of the Perforce
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29 | * command line client
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30 | */
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31 | public abstract class P4HandlerAdapter implements P4Handler {
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32 |
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33 | String p4input = "";
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34 | private PumpStreamHandler myHandler = null;
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35 | /**
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36 | * set any data to be written to P4's stdin
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37 | * @param p4Input the text to write to P4's stdin
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38 | */
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39 | public void setOutput(String p4Input) {
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40 | this.p4input = p4Input;
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41 | }
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42 | /**
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43 | * subclasses of P4HandlerAdapter must implement this routine
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44 | * processing of one line of stdout or of stderr
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45 | * @param line line of stdout or stderr to process
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46 | */
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47 | public abstract void process(String line);
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48 |
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49 | /**
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50 | * this routine gets called by the execute routine of the Execute class
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51 | * it connects the PumpStreamHandler to the input/output/error streams of the process.
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52 | * @throws BuildException
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53 | * @see org.apache.tools.ant.taskdefs.Execute#execute
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54 | */
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55 | public void start() throws BuildException {
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56 | if (p4input != null && p4input.length() > 0) {
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57 | myHandler = new PumpStreamHandler(new P4OutputStream(this), new P4OutputStream(this),
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58 | new ByteArrayInputStream(p4input.getBytes()));
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59 | } else {
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60 | myHandler = new PumpStreamHandler(new P4OutputStream(this), new P4OutputStream(this));
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61 | }
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62 | myHandler.setProcessInputStream(os);
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63 | myHandler.setProcessErrorStream(es);
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64 | myHandler.setProcessOutputStream(is);
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65 | myHandler.start();
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66 | }
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67 |
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68 | /**
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69 | * stops the processing of streams
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70 | * called from P4Base#execP4Command(String command, P4Handler handler)
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71 | * @see P4Base#execP4Command(String, P4Handler)
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72 | */
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73 | public void stop() {
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74 | myHandler.stop();
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75 | }
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76 |
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77 | OutputStream os; //Input
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78 | InputStream is; //Output
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79 | InputStream es; //Error
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80 |
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81 | /**
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82 | * connects the handler to the input stream into Perforce
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83 | * used indirectly by tasks requiring to send specific standard input
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84 | * such as p4label, p4change
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85 | * @param os the stream bringing input to the p4 executable
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86 | * @throws IOException under unknown circumstances
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87 | */
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88 | public void setProcessInputStream(OutputStream os) throws IOException {
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89 | this.os = os;
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90 | }
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91 |
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92 | /**
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93 | * connects the handler to the stderr of the Perforce process
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94 | * @param is stderr coming from Perforce
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95 | * @throws IOException under unknown circumstances
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96 | */
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97 | public void setProcessErrorStream(InputStream is) throws IOException {
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98 | this.es = is;
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99 | }
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100 |
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101 | /**
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102 | * connects the handler to the stdout of the Perforce process
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103 | * @param is stdout coming from Perforce
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104 | * @throws IOException under unknown circumstances
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105 | */
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106 | public void setProcessOutputStream(InputStream is) throws IOException {
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107 | this.is = is;
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108 | }
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109 | }
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