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| <p class="shortcomment cmt"><a href="../index.html" class="extype" name="org.apache.daffodil.sapi">org.apache.daffodil.sapi</a> - Provides the classes necessary to compile DFDL schemas, parse and unparse files using the compiled objects, and retrieve results and parsing diagnostics</p><div class="fullcomment"><div class="comment cmt"><h4> Apache Daffodil (incubating) Scala API </h4><h5> Packages </h5><p><a href="../index.html" class="extype" name="org.apache.daffodil.sapi">org.apache.daffodil.sapi</a> - Provides the classes necessary to compile DFDL schemas, parse and unparse files using the compiled objects, and retrieve results and parsing diagnostics</p><p><a href="../logger/index.html" class="extype" name="org.apache.daffodil.sapi.logger">org.apache.daffodil.sapi.logger</a> - Provides the classes necessary to receive logging messages from Daffodil.</p><p><a href="../debugger/index.html" class="extype" name="org.apache.daffodil.sapi.debugger">org.apache.daffodil.sapi.debugger</a> - Provides the classes necessary to perform parse tracing or create a custom debugger</p></div><dl class="attributes block"> <dt>Definition Classes</dt><dd><a href="../../../../../index.html" class="extype" name="_root_">root</a></dd></dl></div> |
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| </span> |
| |
| <p class="shortcomment cmt">Provides the classes necessary to compile DFDL schemas, parse and |
| unparse files using the compiled objects, and retrieve results and |
| parsing diagnostics</p><div class="fullcomment"><div class="comment cmt"><p>Provides the classes necessary to compile DFDL schemas, parse and |
| unparse files using the compiled objects, and retrieve results and |
| parsing diagnostics</p><h5> Overview </h5><p>The <a href="../Daffodil$.html" class="extype" name="org.apache.daffodil.sapi.Daffodil">Daffodil</a> object is a factory object to create a <a href="../Compiler.html" class="extype" name="org.apache.daffodil.sapi.Compiler">Compiler</a>. The |
| <a href="../Compiler.html" class="extype" name="org.apache.daffodil.sapi.Compiler">Compiler</a> provides a method to compils a provided DFDL schema into a |
| <a href="../ProcessorFactory.html" class="extype" name="org.apache.daffodil.sapi.ProcessorFactory">ProcessorFactory</a>, which creates a <a href="../DataProcessor.html" class="extype" name="org.apache.daffodil.sapi.DataProcessor">DataProcessor</a>:</p><pre><span class="kw">val</span> c = Daffodil.compiler() |
| <span class="kw">val</span> pf = c.compileFile(file) |
| <span class="kw">val</span> dp = pf.onPath(<span class="lit">"/"</span>)</pre><p>The <a href="../DataProcessor.html" class="extype" name="org.apache.daffodil.sapi.DataProcessor">DataProcessor</a> provides the necessary functions to parse and unparse |
| data, returning a <a href="../ParseResult.html" class="extype" name="org.apache.daffodil.sapi.ParseResult">ParseResult</a> or <a href="../UnparseResult.html" class="extype" name="org.apache.daffodil.sapi.UnparseResult">UnparseResult</a>, respectively. These |
| contain information about the parse/unparse, such as whether or not the |
| processing succeeded any diagnostic information.</p><h6> Parse </h6><p>The <a href="../DataProcessor.html#parse(input:org.apache.daffodil.sapi.io.InputSourceDataInputStream,output:org.apache.daffodil.sapi.infoset.InfosetOutputter):org.apache.daffodil.sapi.ParseResult" class="extmbr" name="org.apache.daffodil.sapi.DataProcessor#parse">DataProcessor.parse</a> method accepts input data to parse in the form |
| of a <a href="InputSourceDataInputStream.html" class="extype" name="org.apache.daffodil.sapi.io.InputSourceDataInputStream">InputSourceDataInputStream</a> and an <a href="../infoset/InfosetOutputter.html" class="extype" name="org.apache.daffodil.sapi.infoset.InfosetOutputter">InfosetOutputter</a> |
| to determine the output representation of the infoset (e.g. Scala XML Nodes, |
| JDOM2 Documents, etc.):</p><pre><span class="kw">val</span> scalaOutputter = <span class="kw">new</span> ScalaXMLInfosetOutputter() |
| <span class="kw">val</span> is = <span class="kw">new</span> InputSourceDataInputStream(data) |
| <span class="kw">val</span> pr = dp.parse(is, scalaOutputter) |
| <span class="kw">val</span> node = scalaOutputter.getResult</pre><p>The <a href="../DataProcessor.html#parse(input:org.apache.daffodil.sapi.io.InputSourceDataInputStream,output:org.apache.daffodil.sapi.infoset.InfosetOutputter):org.apache.daffodil.sapi.ParseResult" class="extmbr" name="org.apache.daffodil.sapi.DataProcessor#parse">DataProcessor.parse</a> method is thread-safe and may be called multiple |
| times without the need to create other data processors. However, |
| <a href="../infoset/InfosetOutputter.html" class="extype" name="org.apache.daffodil.sapi.infoset.InfosetOutputter">InfosetOutputter</a>'s are not thread safe, requiring a unique instance per |
| thread. An <a href="../infoset/InfosetOutputter.html" class="extype" name="org.apache.daffodil.sapi.infoset.InfosetOutputter">InfosetOutputter</a> should call <a href="../infoset/InfosetOutputter.html#reset():Unit" class="extmbr" name="org.apache.daffodil.sapi.infoset.InfosetOutputter#reset">InfosetOutputter.reset</a> before |
| reuse (or a new one should be allocated). For example:</p><pre><span class="kw">val</span> scalaOutputter = <span class="kw">new</span> ScalaXMLInfosetOutputter() |
| files.foreach { f <span class="kw">=></span> { |
| outputter.reset |
| <span class="kw">val</span> is = <span class="kw">new</span> InputSourceDataInputStream(<span class="kw">new</span> FileInputStream(f)) |
| <span class="kw">val</span> pr = dp.parse(is, scalaOutputter) |
| <span class="kw">val</span> node = scalaOutputter.getResult |
| }</pre><p>One can repeat calls to parse() using the same InputSourceDataInputStream to continue parsing where the previous parse ended. For example:</p><pre><span class="kw">val</span> is = <span class="kw">new</span> InputSourceDataInputStream(dataStream) |
| <span class="kw">val</span> scalaOutputter = <span class="kw">new</span> ScalaXMLInfosetOutputter() |
| <span class="kw">val</span> keepParsing = <span class="kw">true</span> |
| <span class="kw">while</span> (keepParsing) { |
| scalaOutputter.reset() |
| <span class="kw">val</span> pr = dp.parse(is, jdomOutputter) |
| ... |
| keepParsing = !pr.location().isAtEnd() && !pr.isError() |
| }</pre><h6> Unparse </h6><p>The same <a href="../DataProcessor.html" class="extype" name="org.apache.daffodil.sapi.DataProcessor">DataProcessor</a> used for parse can be used to unparse an infoset |
| via the <a href="../DataProcessor.html#unparse(input:org.apache.daffodil.sapi.infoset.InfosetInputter,output:java.nio.channels.WritableByteChannel):org.apache.daffodil.sapi.UnparseResult" class="extmbr" name="org.apache.daffodil.sapi.DataProcessor#unparse">DataProcessor.unparse</a> method. An <a href="../infoset/InfosetInputter.html" class="extype" name="org.apache.daffodil.sapi.infoset.InfosetInputter">InfosetInputter</a> |
| provides the infoset to unparse, with the unparsed data written to the |
| provided java.nio.channels.WritableByteChannel. For example:</p><pre><span class="kw">val</span> inputter = <span class="kw">new</span> ScalaXMLInfosetInputter(node) |
| <span class="kw">val</span> ur = dp.unparse(inputter, wbc)</pre><h5> Failures and Diagnostics </h5><p>It is possible that failures could occur during the creation of the |
| <a href="../ProcessorFactory.html" class="extype" name="org.apache.daffodil.sapi.ProcessorFactory">ProcessorFactory</a>, <a href="../DataProcessor.html" class="extype" name="org.apache.daffodil.sapi.DataProcessor">DataProcessor</a>, or <a href="../ParseResult.html" class="extype" name="org.apache.daffodil.sapi.ParseResult">ParseResult</a>. However, rather than |
| throwing an exception on error (e.g. invalid DFDL schema, parse |
| error, etc), these classes extend <a href="../WithDiagnostics.html" class="extype" name="org.apache.daffodil.sapi.WithDiagnostics">WithDiagnostics</a>, which is used to |
| determine if an error occurred, and any diagnostic information (see |
| <a href="../Diagnostic.html" class="extype" name="org.apache.daffodil.sapi.Diagnostic">Diagnostic</a>) related to the step. Thus, before continuing, one must check |
| <a href="../WithDiagnostics.html#isError():Boolean" class="extmbr" name="org.apache.daffodil.sapi.WithDiagnostics#isError">WithDiagnostics.isError</a>. For example:</p><pre><span class="kw">val</span> pf = c.compile(file) |
| <span class="kw">if</span> (pf.isError()) { |
| <span class="kw">val</span> diags = pf.getDiagnostics() |
| diags.foreach { d <span class="kw">=></span> |
| System.out.println(d.toString()) |
| } |
| <span class="kw">return</span> -<span class="num">1</span>; |
| }</pre><h5> Saving and Reloading Parsers </h5><p>In some cases, it may be beneficial to save a parser and reload it. |
| For example, when starting up, it may be quicker to reload an |
| already compiled parser than to compile it from scratch. To save a |
| <a href="../DataProcessor.html" class="extype" name="org.apache.daffodil.sapi.DataProcessor">DataProcessor</a>:</p><pre><span class="kw">val</span> dp = pf.onPath(<span class="lit">"/"</span>) |
| dp.save(saveFile);</pre><p>And to restore a saved <a href="../DataProcessor.html" class="extype" name="org.apache.daffodil.sapi.DataProcessor">DataProcessor</a>:</p><pre><span class="kw">val</span> dp = Daffodil.reload(saveFile); |
| <span class="kw">val</span> pr = dp.parse(data, inputter);</pre></div><dl class="attributes block"> <dt>Definition Classes</dt><dd><a href="../../index.html" class="extype" name="org.apache.daffodil">daffodil</a></dd></dl></div> |
| </li><li name="org.apache.daffodil.sapi.debugger" visbl="pub" class="indented5 " data-isabs="false" fullComment="yes" group="Ungrouped"> |
| <a id="debugger"></a><a id="debugger:debugger"></a> |
| <span class="permalink"> |
| <a href="../../../../org/apache/daffodil/sapi/index.html#debugger" title="Permalink"> |
| <i class="material-icons"></i> |
| </a> |
| </span> |
| <span class="modifier_kind"> |
| <span class="modifier"></span> |
| <span class="kind">package</span> |
| </span> |
| <span class="symbol"> |
| <a title="Provides the classes necessary to perform parse tracing or create a custom debugger" href="../debugger/index.html"><span class="name">debugger</span></a> |
| </span> |
| |
| <p class="shortcomment cmt">Provides the classes necessary to perform parse tracing or create a custom debugger</p><div class="fullcomment"><div class="comment cmt"><p>Provides the classes necessary to perform parse tracing or create a custom debugger</p><h5> Overview </h5><p>Daffodil comes with one prebuilt debugger, the <a href="../debugger/TraceDebuggerRunner.html" class="extype" name="org.apache.daffodil.sapi.debugger.TraceDebuggerRunner">TraceDebuggerRunner</a>, which outputs |
| verbose information during the parsing processes, which can be used to aid |
| in debugging a DFDL schema. For example, the <a href="../debugger/TraceDebuggerRunner.html" class="extype" name="org.apache.daffodil.sapi.debugger.TraceDebuggerRunner">TraceDebuggerRunner</a> can be use like so:</p><pre><span class="kw">val</span> tdr = <span class="kw">new</span> TraceDebuggerRunner() |
| Daffodil.setDebugger(tdr)</pre><p>Additionally, one may create their own debugger runner by implementing the |
| methods in the <a href="../debugger/DebuggerRunner.html" class="extype" name="org.apache.daffodil.sapi.debugger.DebuggerRunner">DebuggerRunner</a>.</p><p>Once the debugger is set, it must then be turned on, like so:</p><pre>Daffodil.setDebugging(<span class="kw">true</span>);</pre></div><dl class="attributes block"> <dt>Definition Classes</dt><dd><a href="../index.html" class="extype" name="org.apache.daffodil.sapi">sapi</a></dd></dl></div> |
| </li><li name="org.apache.daffodil.sapi.infoset" visbl="pub" class="indented5 " data-isabs="false" fullComment="yes" group="Ungrouped"> |
| <a id="infoset"></a><a id="infoset:infoset"></a> |
| <span class="permalink"> |
| <a href="../../../../org/apache/daffodil/sapi/index.html#infoset" title="Permalink"> |
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| </a> |
| </span> |
| <span class="modifier_kind"> |
| <span class="modifier"></span> |
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| </span> |
| <span class="symbol"> |
| <a title="Defines various classes used control the representation of the infoset for parse and unparse." href="../infoset/index.html"><span class="name">infoset</span></a> |
| </span> |
| |
| <p class="shortcomment cmt">Defines various classes used control the representation of the infoset for parse and unparse.</p><div class="fullcomment"><div class="comment cmt"><p>Defines various classes used control the representation of the infoset for parse and unparse. |
| Classes that extend <a href="../infoset/InfosetOutputter.html" class="extype" name="org.apache.daffodil.sapi.infoset.InfosetOutputter">InfosetOutputter</a> are provided to the <a href="../DataProcessor.html#parse(input:org.apache.daffodil.sapi.io.InputSourceDataInputStream,output:org.apache.daffodil.sapi.infoset.InfosetOutputter):org.apache.daffodil.sapi.ParseResult" class="extmbr" name="org.apache.daffodil.sapi.DataProcessor#parse">DataProcessor.parse</a> |
| method to deteremine how to output an infoset. These classes are not |
| guaranteed to be thread-safe. Classes that extend <a href="../infoset/InfosetInputter.html" class="extype" name="org.apache.daffodil.sapi.infoset.InfosetInputter">InfosetInputter</a> are |
| provided to the <a href="../DataProcessor.html#unparse(input:org.apache.daffodil.sapi.infoset.InfosetInputter,output:java.nio.channels.WritableByteChannel):org.apache.daffodil.sapi.UnparseResult" class="extmbr" name="org.apache.daffodil.sapi.DataProcessor#unparse">DataProcessor.unparse</a> method to determine how to read in |
| an infoset. A new InfosetOutputter is required for each call to unparse(). |
| </p></div><dl class="attributes block"> <dt>Definition Classes</dt><dd><a href="../index.html" class="extype" name="org.apache.daffodil.sapi">sapi</a></dd></dl></div> |
| </li><li name="org.apache.daffodil.sapi.io" visbl="pub" class="indented5 current" data-isabs="false" fullComment="yes" group="Ungrouped"> |
| <a id="io"></a><a id="io:io"></a> |
| <span class="permalink"> |
| <a href="../../../../org/apache/daffodil/sapi/index.html#io" title="Permalink"> |
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| </span> |
| |
| <div class="fullcomment"><dl class="attributes block"> <dt>Definition Classes</dt><dd><a href="../index.html" class="extype" name="org.apache.daffodil.sapi">sapi</a></dd></dl></div> |
| </li><li class="current-entities indented5"> |
| <span class="separator"></span> |
| <a class="class" href="InputSourceDataInputStream.html" title="Provides Daffodil with byte data from an InputStream, ByteBuffer, or byte Array."></a> |
| <a href="InputSourceDataInputStream.html" title="Provides Daffodil with byte data from an InputStream, ByteBuffer, or byte Array.">InputSourceDataInputStream</a> |
| </li><li name="org.apache.daffodil.sapi.logger" visbl="pub" class="indented5 " data-isabs="false" fullComment="yes" group="Ungrouped"> |
| <a id="logger"></a><a id="logger:logger"></a> |
| <span class="permalink"> |
| <a href="../../../../org/apache/daffodil/sapi/index.html#logger" title="Permalink"> |
| <i class="material-icons"></i> |
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| </span> |
| <span class="modifier_kind"> |
| <span class="modifier"></span> |
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| </span> |
| <span class="symbol"> |
| <a title="Provides the classes necessary to receive logging messages from Daffodil." href="../logger/index.html"><span class="name">logger</span></a> |
| </span> |
| |
| <p class="shortcomment cmt">Provides the classes necessary to receive logging messages from Daffodil.</p><div class="fullcomment"><div class="comment cmt"><p>Provides the classes necessary to receive logging messages from Daffodil.</p><h5> Overview </h5><p>Daffodil comes with three prebuilt log writers:</p><ul><li><a href="../logger/ConsoleLogWriter.html" class="extype" name="org.apache.daffodil.sapi.logger.ConsoleLogWriter">ConsoleLogWriter</a> - writes all log messages to stdout</li><li><a href="../logger/FileLogWriter.html" class="extype" name="org.apache.daffodil.sapi.logger.FileLogWriter">FileLogWriter</a> - writes all log messages to file</li><li><a href="../logger/NullLogWriter.html" class="extype" name="org.apache.daffodil.sapi.logger.NullLogWriter">NullLogWriter</a> - drop all log messages</li></ul><p>To use one of these log writers, create and instance of it and pass it to |
| <a href="../Daffodil$.html#setLogWriter(lw:org.apache.daffodil.sapi.logger.LogWriter):Unit" class="extmbr" name="org.apache.daffodil.sapi.Daffodil#setLogWriter">Daffodil.setLogWriter</a>. For example, to write all logs to <code>/var/log/daffodil.log</code>:</p><pre><span class="kw">val</span> lw = <span class="kw">new</span> FileLogWriter(<span class="kw">new</span> File(<span class="lit">"/var/log/daffodil.log"</span>)) |
| Daffodil.setLogWriter(lw)</pre><p>One may also change the log level using <a href="../Daffodil$.html#setLoggingLevel(lvl:org.apache.daffodil.sapi.logger.LogLevel.Value):Unit" class="extmbr" name="org.apache.daffodil.sapi.Daffodil#setLoggingLevel">Daffodil.setLoggingLevel</a>, which |
| defaults to <a href="../logger/LogLevel$.html#Info:org.apache.daffodil.sapi.logger.LogLevel.Value" class="extmbr" name="org.apache.daffodil.sapi.logger.LogLevel#Info">LogLevel.Info</a> if not set. For example, to change the log |
| level to <a href="../logger/LogLevel$.html#Warning:org.apache.daffodil.sapi.logger.LogLevel.Value" class="extmbr" name="org.apache.daffodil.sapi.logger.LogLevel#Warning">LogLevel.Warning</a>:</p><pre>Daffodil.setLoggingLevel(LogLevel.Warning);</pre></div><dl class="attributes block"> <dt>Definition Classes</dt><dd><a href="../index.html" class="extype" name="org.apache.daffodil.sapi">sapi</a></dd></dl></div> |
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| <p class="shortcomment cmt">Provides Daffodil with byte data from an InputStream, ByteBuffer, or byte |
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