http://xmlgraphics.apache.org/commons/: Apache XML Graphics Commons is a library that consists of several reusable components used by Apache Batik and Apache FOP. Many of these components can easily be used separately outside the domains of SVG and XSL-FO. (Apache Software Foundation) 
public final class org.apache.xmlgraphics.io.XmlSourceUtil
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: org.apache.xmlgraphics.io.XmlSourceUtil
  super_class: java.lang.Object
{
  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.xmlgraphics.io.XmlSourceUtil this
         0: .line 47
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 48
            return
        end local 0 // org.apache.xmlgraphics.io.XmlSourceUtil this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/apache/xmlgraphics/io/XmlSourceUtil;

  public static java.io.InputStream getInputStream(javax.xml.transform.Source);
    descriptor: (Ljavax/xml/transform/Source;)Ljava/io/InputStream;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=3, args_size=1
        start local 0 // javax.xml.transform.Source src
         0: .line 58
            aload 0 /* src */
            instanceof javax.xml.transform.stream.StreamSource
            ifeq 3
         1: .line 59
            aload 0 /* src */
            checkcast javax.xml.transform.stream.StreamSource
            invokevirtual javax.xml.transform.stream.StreamSource.getInputStream:()Ljava/io/InputStream;
         2: areturn
         3: .line 60
      StackMap locals:
      StackMap stack:
            aload 0 /* src */
            instanceof javax.xml.transform.dom.DOMSource
            ifeq 9
         4: .line 61
            new java.io.ByteArrayOutputStream
            dup
            invokespecial java.io.ByteArrayOutputStream.<init>:()V
            astore 1 /* outStream */
        start local 1 // java.io.ByteArrayOutputStream outStream
         5: .line 62
            new javax.xml.transform.stream.StreamResult
            dup
            aload 1 /* outStream */
            invokespecial javax.xml.transform.stream.StreamResult.<init>:(Ljava/io/OutputStream;)V
            astore 2 /* xmlSource */
        start local 2 // javax.xml.transform.stream.StreamResult xmlSource
         6: .line 63
            invokestatic javax.xml.transform.TransformerFactory.newInstance:()Ljavax/xml/transform/TransformerFactory;
            invokevirtual javax.xml.transform.TransformerFactory.newTransformer:()Ljavax/xml/transform/Transformer;
            aload 0 /* src */
            aload 2 /* xmlSource */
            invokevirtual javax.xml.transform.Transformer.transform:(Ljavax/xml/transform/Source;Ljavax/xml/transform/Result;)V
         7: .line 64
            new java.io.ByteArrayInputStream
            dup
            aload 1 /* outStream */
            invokevirtual java.io.ByteArrayOutputStream.toByteArray:()[B
            invokespecial java.io.ByteArrayInputStream.<init>:([B)V
         8: areturn
        end local 2 // javax.xml.transform.stream.StreamResult xmlSource
        end local 1 // java.io.ByteArrayOutputStream outStream
         9: .line 65
      StackMap locals:
      StackMap stack:
            aload 0 /* src */
            instanceof javax.xml.transform.sax.SAXSource
            ifeq 12
        10: .line 66
            aload 0 /* src */
            checkcast javax.xml.transform.sax.SAXSource
            invokevirtual javax.xml.transform.sax.SAXSource.getInputSource:()Lorg/xml/sax/InputSource;
            invokevirtual org.xml.sax.InputSource.getByteStream:()Ljava/io/InputStream;
        11: areturn
        12: .line 67
      StackMap locals:
      StackMap stack:
            aload 0 /* src */
            instanceof org.apache.xmlgraphics.image.loader.ImageSource
            ifeq 16
        13: .line 68
            new org.apache.xmlgraphics.image.loader.util.ImageInputStreamAdapter
            dup
            aload 0 /* src */
            checkcast org.apache.xmlgraphics.image.loader.ImageSource
            invokevirtual org.apache.xmlgraphics.image.loader.ImageSource.getImageInputStream:()Ljavax/imageio/stream/ImageInputStream;
            invokespecial org.apache.xmlgraphics.image.loader.util.ImageInputStreamAdapter.<init>:(Ljavax/imageio/stream/ImageInputStream;)V
        14: areturn
        15: .line 70
      StackMap locals:
      StackMap stack: java.lang.Exception
            pop
        16: .line 73
      StackMap locals:
      StackMap stack:
            aconst_null
            areturn
        end local 0 // javax.xml.transform.Source src
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0   17     0        src  Ljavax/xml/transform/Source;
            5    9     1  outStream  Ljava/io/ByteArrayOutputStream;
            6    9     2  xmlSource  Ljavax/xml/transform/stream/StreamResult;
      Exception table:
        from    to  target  type
           0     2      15  Class java.lang.Exception
           3     8      15  Class java.lang.Exception
           9    11      15  Class java.lang.Exception
          12    14      15  Class java.lang.Exception
    MethodParameters:
      Name  Flags
      src   

  public static java.io.InputStream needInputStream(javax.xml.transform.Source);
    descriptor: (Ljavax/xml/transform/Source;)Ljava/io/InputStream;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=2, args_size=1
        start local 0 // javax.xml.transform.Source src
         0: .line 83
            aload 0 /* src */
            invokestatic org.apache.xmlgraphics.io.XmlSourceUtil.getInputStream:(Ljavax/xml/transform/Source;)Ljava/io/InputStream;
            astore 1 /* in */
        start local 1 // java.io.InputStream in
         1: .line 84
            aload 1 /* in */
            ifnull 3
         2: .line 85
            aload 1 /* in */
            areturn
         3: .line 87
      StackMap locals: java.io.InputStream
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
            ldc "Source must be a StreamSource with an InputStream or an ImageSource"
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
        end local 1 // java.io.InputStream in
        end local 0 // javax.xml.transform.Source src
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0   src  Ljavax/xml/transform/Source;
            1    4     1    in  Ljava/io/InputStream;
    MethodParameters:
      Name  Flags
      src   

  public static boolean hasReader(javax.xml.transform.Source);
    descriptor: (Ljavax/xml/transform/Source;)Z
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=2, args_size=1
        start local 0 // javax.xml.transform.Source src
         0: .line 98
            aload 0 /* src */
            instanceof javax.xml.transform.stream.StreamSource
            ifeq 4
         1: .line 99
            aload 0 /* src */
            checkcast javax.xml.transform.stream.StreamSource
            invokevirtual javax.xml.transform.stream.StreamSource.getReader:()Ljava/io/Reader;
            astore 1 /* reader */
        start local 1 // java.io.Reader reader
         2: .line 100
            aload 1 /* reader */
            ifnull 3
            iconst_1
            ireturn
      StackMap locals: java.io.Reader
      StackMap stack:
         3: iconst_0
            ireturn
        end local 1 // java.io.Reader reader
         4: .line 101
      StackMap locals:
      StackMap stack:
            aload 0 /* src */
            instanceof javax.xml.transform.sax.SAXSource
            ifeq 9
         5: .line 102
            aload 0 /* src */
            checkcast javax.xml.transform.sax.SAXSource
            invokevirtual javax.xml.transform.sax.SAXSource.getInputSource:()Lorg/xml/sax/InputSource;
            astore 1 /* is */
        start local 1 // org.xml.sax.InputSource is
         6: .line 103
            aload 1 /* is */
            ifnull 9
         7: .line 104
            aload 1 /* is */
            invokevirtual org.xml.sax.InputSource.getCharacterStream:()Ljava/io/Reader;
            ifnull 8
            iconst_1
            ireturn
      StackMap locals: org.xml.sax.InputSource
      StackMap stack:
         8: iconst_0
            ireturn
        end local 1 // org.xml.sax.InputSource is
         9: .line 107
      StackMap locals:
      StackMap stack:
            iconst_0
            ireturn
        end local 0 // javax.xml.transform.Source src
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0   10     0     src  Ljavax/xml/transform/Source;
            2    4     1  reader  Ljava/io/Reader;
            6    9     1      is  Lorg/xml/sax/InputSource;
    MethodParameters:
      Name  Flags
      src   

  public static void removeStreams(javax.xml.transform.Source);
    descriptor: (Ljavax/xml/transform/Source;)V
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // javax.xml.transform.Source src
         0: .line 116
            aload 0 /* src */
            instanceof org.apache.xmlgraphics.image.loader.ImageSource
            ifeq 4
         1: .line 117
            aload 0 /* src */
            checkcast org.apache.xmlgraphics.image.loader.ImageSource
            astore 1 /* isrc */
        start local 1 // org.apache.xmlgraphics.image.loader.ImageSource isrc
         2: .line 118
            aload 1 /* isrc */
            aconst_null
            invokevirtual org.apache.xmlgraphics.image.loader.ImageSource.setImageInputStream:(Ljavax/imageio/stream/ImageInputStream;)V
        end local 1 // org.apache.xmlgraphics.image.loader.ImageSource isrc
         3: .line 119
            goto 14
      StackMap locals:
      StackMap stack:
         4: aload 0 /* src */
            instanceof javax.xml.transform.stream.StreamSource
            ifeq 9
         5: .line 120
            aload 0 /* src */
            checkcast javax.xml.transform.stream.StreamSource
            astore 1 /* ssrc */
        start local 1 // javax.xml.transform.stream.StreamSource ssrc
         6: .line 121
            aload 1 /* ssrc */
            aconst_null
            invokevirtual javax.xml.transform.stream.StreamSource.setInputStream:(Ljava/io/InputStream;)V
         7: .line 122
            aload 1 /* ssrc */
            aconst_null
            invokevirtual javax.xml.transform.stream.StreamSource.setReader:(Ljava/io/Reader;)V
        end local 1 // javax.xml.transform.stream.StreamSource ssrc
         8: .line 123
            goto 14
      StackMap locals:
      StackMap stack:
         9: aload 0 /* src */
            instanceof javax.xml.transform.sax.SAXSource
            ifeq 14
        10: .line 124
            aload 0 /* src */
            checkcast javax.xml.transform.sax.SAXSource
            invokevirtual javax.xml.transform.sax.SAXSource.getInputSource:()Lorg/xml/sax/InputSource;
            astore 1 /* is */
        start local 1 // org.xml.sax.InputSource is
        11: .line 125
            aload 1 /* is */
            ifnull 14
        12: .line 126
            aload 1 /* is */
            aconst_null
            invokevirtual org.xml.sax.InputSource.setByteStream:(Ljava/io/InputStream;)V
        13: .line 127
            aload 1 /* is */
            aconst_null
            invokevirtual org.xml.sax.InputSource.setCharacterStream:(Ljava/io/Reader;)V
        end local 1 // org.xml.sax.InputSource is
        14: .line 130
      StackMap locals:
      StackMap stack:
            return
        end local 0 // javax.xml.transform.Source src
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   15     0   src  Ljavax/xml/transform/Source;
            2    3     1  isrc  Lorg/apache/xmlgraphics/image/loader/ImageSource;
            6    8     1  ssrc  Ljavax/xml/transform/stream/StreamSource;
           11   14     1    is  Lorg/xml/sax/InputSource;
    MethodParameters:
      Name  Flags
      src   

  public static void closeQuietly(javax.xml.transform.Source);
    descriptor: (Ljavax/xml/transform/Source;)V
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=2, args_size=1
        start local 0 // javax.xml.transform.Source src
         0: .line 138
            aload 0 /* src */
            instanceof javax.xml.transform.stream.StreamSource
            ifeq 4
         1: .line 139
            aload 0 /* src */
            checkcast javax.xml.transform.stream.StreamSource
            astore 1 /* streamSource */
        start local 1 // javax.xml.transform.stream.StreamSource streamSource
         2: .line 140
            aload 1 /* streamSource */
            invokevirtual javax.xml.transform.stream.StreamSource.getReader:()Ljava/io/Reader;
            invokestatic org.apache.commons.io.IOUtils.closeQuietly:(Ljava/io/Reader;)V
        end local 1 // javax.xml.transform.stream.StreamSource streamSource
         3: .line 141
            goto 15
      StackMap locals:
      StackMap stack:
         4: aload 0 /* src */
            instanceof org.apache.xmlgraphics.image.loader.ImageSource
            ifeq 10
         5: .line 142
            aload 0 /* src */
            invokestatic org.apache.xmlgraphics.image.loader.util.ImageUtil.getImageInputStream:(Ljavax/xml/transform/Source;)Ljavax/imageio/stream/ImageInputStream;
            ifnull 15
         6: .line 144
            aload 0 /* src */
            invokestatic org.apache.xmlgraphics.image.loader.util.ImageUtil.getImageInputStream:(Ljavax/xml/transform/Source;)Ljavax/imageio/stream/ImageInputStream;
            invokeinterface javax.imageio.stream.ImageInputStream.close:()V
         7: .line 145
            goto 15
      StackMap locals:
      StackMap stack: java.io.IOException
         8: pop
         9: .line 149
            goto 15
      StackMap locals:
      StackMap stack:
        10: aload 0 /* src */
            instanceof javax.xml.transform.sax.SAXSource
            ifeq 15
        11: .line 150
            aload 0 /* src */
            checkcast javax.xml.transform.sax.SAXSource
            invokevirtual javax.xml.transform.sax.SAXSource.getInputSource:()Lorg/xml/sax/InputSource;
            astore 1 /* is */
        start local 1 // org.xml.sax.InputSource is
        12: .line 151
            aload 1 /* is */
            ifnull 15
        13: .line 152
            aload 1 /* is */
            invokevirtual org.xml.sax.InputSource.getByteStream:()Ljava/io/InputStream;
            invokestatic org.apache.commons.io.IOUtils.closeQuietly:(Ljava/io/InputStream;)V
        14: .line 153
            aload 1 /* is */
            invokevirtual org.xml.sax.InputSource.getCharacterStream:()Ljava/io/Reader;
            invokestatic org.apache.commons.io.IOUtils.closeQuietly:(Ljava/io/Reader;)V
        end local 1 // org.xml.sax.InputSource is
        15: .line 156
      StackMap locals:
      StackMap stack:
            aload 0 /* src */
            invokestatic org.apache.xmlgraphics.io.XmlSourceUtil.removeStreams:(Ljavax/xml/transform/Source;)V
        16: .line 157
            return
        end local 0 // javax.xml.transform.Source src
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0   17     0           src  Ljavax/xml/transform/Source;
            2    3     1  streamSource  Ljavax/xml/transform/stream/StreamSource;
           12   15     1            is  Lorg/xml/sax/InputSource;
      Exception table:
        from    to  target  type
           6     7       8  Class java.io.IOException
    MethodParameters:
      Name  Flags
      src   

  public static boolean hasInputStream(javax.xml.transform.Source);
    descriptor: (Ljavax/xml/transform/Source;)Z
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // javax.xml.transform.Source src
         0: .line 165
            aload 0 /* src */
            invokestatic org.apache.xmlgraphics.io.XmlSourceUtil.getInputStream:(Ljavax/xml/transform/Source;)Ljava/io/InputStream;
            ifnull 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
        end local 0 // javax.xml.transform.Source src
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0   src  Ljavax/xml/transform/Source;
    MethodParameters:
      Name  Flags
      src   
}
SourceFile: "XmlSourceUtil.java"