aboutsummaryrefslogtreecommitdiff
path: root/common/src/at/gv/egovernment/moa/util/StreamUtils.java
diff options
context:
space:
mode:
Diffstat (limited to 'common/src/at/gv/egovernment/moa/util/StreamUtils.java')
-rw-r--r--common/src/at/gv/egovernment/moa/util/StreamUtils.java116
1 files changed, 116 insertions, 0 deletions
diff --git a/common/src/at/gv/egovernment/moa/util/StreamUtils.java b/common/src/at/gv/egovernment/moa/util/StreamUtils.java
new file mode 100644
index 000000000..88db24504
--- /dev/null
+++ b/common/src/at/gv/egovernment/moa/util/StreamUtils.java
@@ -0,0 +1,116 @@
+package at.gv.egovernment.moa.util;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * 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);
+ }
+
+}