Record position in parse exception

[cql-java-moved-to-github.git] / src / main / java / org / z3950 / zing / cql / PositionAwareReader.java

diff --git a/src/main/java/org/z3950/zing/cql/PositionAwareReader.java b/src/main/java/org/z3950/zing/cql/PositionAwareReader.java
new file mode 100644 (file)
index 0000000..b3294c0
--- /dev/null
+++ b/src/main/java/org/z3950/zing/cql/PositionAwareReader.java
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 1995-2012, Index Data
+ * All rights reserved.
+ * See the file LICENSE for details.
+ */
+package org.z3950.zing.cql;
+
+import java.io.IOException;
+import java.io.Reader;
+import java.nio.CharBuffer;
+
+/**
+ * Reader proxy to count how many characters has been read so far.
+ * @author jakub
+ */
+public class PositionAwareReader extends Reader {
+  protected Reader reader;
+  protected int pos = -1;
+  
+  public PositionAwareReader(Reader reader) {
+    this.reader = reader;
+  }
+
+  /*
+   * Position of the last read character or -1 if either reading from an empty 
+   * stream or no 'read' has been invoked for this reader.
+   */
+  public int getPosition() {
+    return pos;
+  }
+
+  @Override
+  public void mark(int readAheadLimit) throws IOException {
+    reader.mark(readAheadLimit);
+  }
+
+  @Override
+  public boolean markSupported() {
+    return reader.markSupported();
+  }
+
+  @Override
+  public int read() throws IOException {
+    int c = reader.read();
+    if (c != -1) pos++;
+    return c;
+  }
+
+  @Override
+  public int read(char[] cbuf) throws IOException {
+    int c = reader.read(cbuf);
+    if (c != -1) pos+=c;
+    return c;
+  }
+
+  @Override
+  public int read(CharBuffer target) throws IOException {
+    int c = reader.read(target);
+    if (c != -1) pos+=c;
+    return c;
+  }
+  
+  @Override
+  public int read(char[] cbuf, int off, int len) throws IOException {
+    int c = reader.read(cbuf, off, len);
+    if (c != -1) pos+=c;
+    return c;
+  }
+
+  @Override
+  public boolean ready() throws IOException {
+    return reader.ready();
+  }
+
+  @Override
+  public long skip(long n) throws IOException {
+    return reader.skip(n);
+  }
+  
+  @Override
+  public void close() throws IOException {
+    reader.close();
+  }
+
+  @Override
+  public void reset() throws IOException {
+    reader.reset();
+  }
+  
+  //override object methods, to be on the safe-side
+
+  @Override
+  public boolean equals(Object obj) {
+    return reader.equals(obj);
+  }
+
+  @Override
+  public String toString() {
+    return reader.toString();
+  }
+
+  @Override
+  public int hashCode() {
+    return reader.hashCode();
+  }
+  
+}