Importing Processing rev. 5503 (1.0.3).

core/src/processing/xml/PIReader.java

@@ -0,0 +1,157 @@
+/* PIReader.java                                                   NanoXML/Java
+ *
+ * $Revision: 1.3 $
+ * $Date: 2002/01/04 21:03:28 $
+ * $Name: RELEASE_2_2_1 $
+ *
+ * This file is part of NanoXML 2 for Java.
+ * Copyright (C) 2000-2002 Marc De Scheemaecker, All Rights Reserved.
+ *
+ * This software is provided 'as-is', without any express or implied warranty.
+ * In no event will the authors be held liable for any damages arising from the
+ * use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ *  1. The origin of this software must not be misrepresented; you must not
+ *     claim that you wrote the original software. If you use this software in
+ *     a product, an acknowledgment in the product documentation would be
+ *     appreciated but is not required.
+ *
+ *  2. Altered source versions must be plainly marked as such, and must not be
+ *     misrepresented as being the original software.
+ *
+ *  3. This notice may not be removed or altered from any source distribution.
+ */
+
+package processing.xml;
+
+
+import java.io.Reader;
+import java.io.IOException;
+
+
+/**
+ * This reader reads data from another reader until the end of a processing
+ * instruction (?>) has been encountered.
+ *
+ * @author Marc De Scheemaecker
+ * @version $Name: RELEASE_2_2_1 $, $Revision: 1.3 $
+ */
+class PIReader
+   extends Reader
+{
+
+   /**
+    * The encapsulated reader.
+    */
+   private StdXMLReader reader;
+
+
+   /**
+    * True if the end of the stream has been reached.
+    */
+   private boolean atEndOfData;
+
+
+   /**
+    * Creates the reader.
+    *
+    * @param reader the encapsulated reader
+    */
+   PIReader(StdXMLReader reader)
+   {
+      this.reader = reader;
+      this.atEndOfData = false;
+   }
+
+
+   /**
+    * Cleans up the object when it's destroyed.
+    */
+   protected void finalize()
+      throws Throwable
+   {
+      this.reader = null;
+      super.finalize();
+   }
+
+
+   /**
+    * Reads a block of data.
+    *
+    * @param buffer where to put the read data
+    * @param offset first position in buffer to put the data
+    * @param size maximum number of chars to read
+    *
+    * @return the number of chars read, or -1 if at EOF
+    *
+    * @throws java.io.IOException
+    *		if an error occurred reading the data
+    */
+   public int read(char[] buffer,
+                   int    offset,
+                   int    size)
+      throws IOException
+   {
+      if (this.atEndOfData) {
+         return -1;
+      }
+
+      int charsRead = 0;
+
+      if ((offset + size) > buffer.length) {
+         size = buffer.length - offset;
+      }
+
+      while (charsRead < size) {
+         char ch = this.reader.read();
+
+         if (ch == '?') {
+            char ch2 = this.reader.read();
+
+            if (ch2 == '>') {
+               this.atEndOfData = true;
+               break;
+            }
+
+            this.reader.unread(ch2);
+         }
+
+         buffer[charsRead] = ch;
+         charsRead++;
+      }
+
+      if (charsRead == 0) {
+         charsRead = -1;
+      }
+
+      return charsRead;
+   }
+
+
+   /**
+    * Skips remaining data and closes the stream.
+    *
+    * @throws java.io.IOException
+    *		if an error occurred reading the data
+    */
+   public void close()
+      throws IOException
+   {
+      while (! this.atEndOfData) {
+         char ch = this.reader.read();
+
+         if (ch == '?') {
+            char ch2 = this.reader.read();
+
+            if (ch2 == '>') {
+               this.atEndOfData = true;
+            }
+         }
+      }
+   }
+
+}