JAL-3032 adds Java 8 functionality (2/2)

[jalview.git] / src2 / javajs / util / DataReader.java

diff --git a/src2/javajs/util/DataReader.java b/src2/javajs/util/DataReader.java
new file mode 100644 (file)
index 0000000..1eb8ade
--- /dev/null
+++ b/src2/javajs/util/DataReader.java
@@ -0,0 +1,56 @@
+package javajs.util;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.Reader;
+import java.io.StringReader;
+
+/**
+ * Just a simple abstract class to join a String reader and a String[]
+ * reader under the same BufferedReader umbrella.
+ * 
+ * Subclassed as StringDataReader, ArrayDataReader, and ListDataReader
+ * 
+ */
+
+public abstract class DataReader extends BufferedReader {
+
+  public abstract DataReader setData(Object data);
+  
+  protected int ptMark;
+
+  public DataReader() {
+    super(new StringReader(""));
+  }
+
+  protected DataReader(Reader in) {
+    super(in);
+  }
+
+  public BufferedReader getBufferedReader() {
+    return this;
+  }
+
+  protected int readBuf(char[] buf, int off, int len) throws IOException {
+    // not used by StringDataReader
+    int nRead = 0;
+    String line = readLine();
+    if (line == null)
+      return 0;
+    int linept = 0;
+    int linelen = line.length();
+    for (int i = off; i < len && linelen >= 0; i++) {
+      if (linept >= linelen) {
+        linept = 0;
+        buf[i] = '\n';
+        line = readLine();
+        linelen = (line == null ? -1 : line.length());
+      } else {
+        buf[i] = line.charAt(linept++);
+      }
+      nRead++;
+    }
+    return nRead;
+  }
+
+}
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