Add simple HTTP to z39.50 example

[yaz4j-moved-to-github.git] / examples / zgate / src / main / java / com / indexdata / zgate / ZgateServlet.java

diff --git a/examples/zgate/src/main/java/com/indexdata/zgate/ZgateServlet.java b/examples/zgate/src/main/java/com/indexdata/zgate/ZgateServlet.java
new file mode 100644 (file)
index 0000000..13b1a07
--- /dev/null
+++ b/examples/zgate/src/main/java/com/indexdata/zgate/ZgateServlet.java
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 1995-2010, Index Data
+ * All rights reserved.
+ * See the file LICENSE for details.
+ */
+package com.indexdata.zgate;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.yaz4j.Connection;
+import org.yaz4j.Record;
+import org.yaz4j.ResultSet;
+import org.yaz4j.exception.ZoomException;
+
+/**
+ *
+ * @author jakub
+ */
+public class ZgateServlet extends HttpServlet {
+
+  @Override
+  public void init() throws ServletException {
+    System.out.println("Zeta: java.library.path=" + System.getProperty("java.library.path"));
+    System.out.println("Zeta: LD_LIBRARY_PATH=" + System.getenv("LD_LIBRARY_PATH"));
+  }
+
+  @Override
+  /*
+   * For dinosaur search use: ?zurl=z3950.loc.gov:7090/voyager&query=@attr 1=7 0253333490&syntax=usmarc
+   **/
+  protected void doGet(HttpServletRequest request, HttpServletResponse response)
+    throws ServletException, IOException {
+    String zurl = request.getParameter("zurl");
+    if (zurl == null || zurl.isEmpty()) { response.sendError(400, "Missing parameter 'zurl'"); return; }
+
+    String query = request.getParameter("query");
+    if (query == null || query.isEmpty()) { response.sendError(400, "Missing parameter 'query'"); return; }
+
+    String syntax = request.getParameter("syntax");
+    if (syntax == null || syntax.isEmpty()) { response.sendError(400, "Missing parameter 'syntax'"); return; }
+
+    int maxrecs=10;
+    if (request.getParameter("maxrecs") != null && !request.getParameter("maxrecs").isEmpty()) {
+      try {
+        maxrecs = Integer.parseInt(request.getParameter("maxrecs"));
+      } catch (NumberFormatException nfe) {
+        response.sendError(400, "Malformed parameter 'maxrecs'");
+        return;
+      }
+    }
+
+    response.getWriter().println("SEARCH PARAMETERS");
+    response.getWriter().println("zurl: " + zurl);
+    response.getWriter().println("query: " + query);
+    response.getWriter().println("syntax: " + syntax);
+    response.getWriter().println("maxrecs: " + maxrecs);
+    response.getWriter().println();
+
+    Connection con = new Connection(zurl, 0);
+    con.setSyntax(syntax);
+    try {
+      con.connect();
+      ResultSet set = con.search(query, Connection.QueryType.PrefixQuery);
+      response.getWriter().println("Showing " + maxrecs + " of " +set.getSize());
+      response.getWriter().println();
+      for(int i=0; i<set.getSize() && i<maxrecs; i++) {
+        Record rec = set.getRecord(i);
+        response.getWriter().print(rec.render());
+      }
+    } catch (ZoomException ze) {
+      throw new ServletException(ze);
+    } finally {
+      con.close();
+    }
+  }
+
+  @Override
+  protected void doPost(HttpServletRequest request, HttpServletResponse response)
+    throws ServletException, IOException {
+  }
+
+  @Override
+  public String getServletInfo() {
+    return "Zeta search engine servlet";
+  }
+}