From 2006356de97eef6d8ce1f4e03ace9a42079be8d1 Mon Sep 17 00:00:00 2001
From: pdanner <pdanner@d688527b-c9ab-4aba-bd8d-4036d912da1d>
Date: Wed, 5 Sep 2007 10:50:49 +0000
Subject: MOA-SP/SS Release 1.4.1

git-svn-id: https://joinup.ec.europa.eu/svn/moa-idspss/tags/Build-SPSS-1_4_1@995 d688527b-c9ab-4aba-bd8d-4036d912da1d
---
 .../at/gv/egovernment/moa/util/StreamUtils.java    | 128 +++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 common/src/main/java/at/gv/egovernment/moa/util/StreamUtils.java

(limited to 'common/src/main/java/at/gv/egovernment/moa/util/StreamUtils.java')

diff --git a/common/src/main/java/at/gv/egovernment/moa/util/StreamUtils.java b/common/src/main/java/at/gv/egovernment/moa/util/StreamUtils.java
new file mode 100644
index 000000000..a22f1c2a8
--- /dev/null
+++ b/common/src/main/java/at/gv/egovernment/moa/util/StreamUtils.java
@@ -0,0 +1,128 @@
+package at.gv.egovernment.moa.util;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.PrintStream;
+
+/**
+ * Utility methods for streams.
+ * 
+ * @author Patrick Peck
+ * @version $Id$
+ */
+public class StreamUtils {
+  
+  /**
+   * Compare the contents of two <code>InputStream</code>s.
+   * 
+   * @param is1 The 1st <code>InputStream</code> to compare.
+   * @param is2 The 2nd <code>InputStream</code> to compare.
+   * @return boolean <code>true</code>, if both streams contain the exactly the
+   * same content, <code>false</code> otherwise.
+   * @throws IOException An error occurred reading one of the streams.
+   */
+  public static boolean compareStreams(InputStream is1, InputStream is2) 
+    throws IOException {
+      
+    byte[] buf1 = new byte[256];
+    byte[] buf2 = new byte[256];
+    int length1;
+    int length2;
+  
+    try {
+      while (true) {
+        length1 = is1.read(buf1);
+        length2 = is2.read(buf2);
+        
+        if (length1 != length2) {
+          return false;
+        }
+        if (length1 <= 0) {
+          return true;
+        }
+        if (!compareBytes(buf1, buf2, length1)) {
+          return false;
+        }
+      }
+    } catch (IOException e) {
+      throw e;
+    } finally {
+      // close both streams
+      try {
+        is1.close();
+        is2.close();
+      } catch (IOException e) {
+        // ignore this
+      }
+    }
+  }
+  
+  /**
+   * Compare two byte arrays, up to a given maximum length.
+   * 
+   * @param b1 1st byte array to compare.
+   * @param b2 2nd byte array to compare.
+   * @param length The maximum number of bytes to compare.
+   * @return <code>true</code>, if the byte arrays are equal, <code>false</code>
+   * otherwise.
+   */
+  private static boolean compareBytes(byte[] b1, byte[] b2, int length) {
+    if (b1.length != b2.length) {
+      return false;
+    }
+  
+    for (int i = 0; i < b1.length && i < length; i++) {
+      if (b1[i] != b2[i]) {
+        return false;
+      }
+    }
+  
+    return true;
+  }
+
+  /**
+   * Reads a byte array from a stream.
+   * @param in The <code>InputStream</code> to read.
+   * @return The bytes contained in the given <code>InputStream</code>.
+   * @throws IOException on any exception thrown
+   */
+  public static byte[] readStream(InputStream in) throws IOException {
+    ByteArrayOutputStream out = new ByteArrayOutputStream();
+    int b;
+    while ((b = in.read()) >= 0)
+      out.write(b);
+    in.close();
+    return out.toByteArray();
+  }
+
+  /**
+   * Reads a <code>String</code> from a stream, using given encoding.
+   * @param in The <code>InputStream</code> to read.
+   * @param encoding The character encoding to use for converting the bytes
+   * of the <code>InputStream</code> into a <code>String</code>.
+   * @return The content of the given <code>InputStream</code> converted into
+   * a <code>String</code>.
+   * @throws IOException on any exception thrown
+   */
+  public static String readStream(InputStream in, String encoding) throws IOException {
+    ByteArrayOutputStream out = new ByteArrayOutputStream();
+    int b;
+    while ((b = in.read()) >= 0)
+      out.write(b);
+    in.close();
+    return out.toString(encoding);
+  }
+  
+  /**
+   * Gets the stack trace of the <code>Throwable</code> passed in as a string.
+   * @param t The <code>Throwable</code>.
+   * @return a String representing the stack trace of the <code>Throwable</code>.
+   */
+  public static String getStackTraceAsString(Throwable t)
+  {
+    ByteArrayOutputStream stackTraceBIS = new ByteArrayOutputStream();
+    t.printStackTrace(new PrintStream(stackTraceBIS));
+    return new String(stackTraceBIS.toByteArray());
+  }
+}
-- 
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