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1   /**
2    * Copyright (c) 2014, stateful.co
3    * All rights reserved.
4    *
5    * Redistribution and use in source and binary forms, with or without
6    * modification, are permitted provided that the following conditions
7    * are met: 1) Redistributions of source code must retain the above
8    * copyright notice, this list of conditions and the following
9    * disclaimer. 2) Redistributions in binary form must reproduce the above
10   * copyright notice, this list of conditions and the following
11   * disclaimer in the documentation and/or other materials provided
12   * with the distribution. 3) Neither the name of the stateful.co nor
13   * the names of its contributors may be used to endorse or promote
14   * products derived from this software without specific prior written
15   * permission.
16   *
17   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
19   * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20   * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21   * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
22   * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
28   * OF THE POSSIBILITY OF SUCH DAMAGE.
29   */
30  package co.stateful.rest;
31  
32  import co.stateful.spi.Counter;
33  import java.io.IOException;
34  import java.math.BigDecimal;
35  import java.net.HttpURLConnection;
36  import javax.ws.rs.GET;
37  import javax.ws.rs.PUT;
38  import javax.ws.rs.Path;
39  import javax.ws.rs.PathParam;
40  import javax.ws.rs.Produces;
41  import javax.ws.rs.QueryParam;
42  import javax.ws.rs.WebApplicationException;
43  import javax.ws.rs.core.MediaType;
44  import javax.ws.rs.core.Response;
45  
46  /**
47   * Counter of a user.
48   *
49   * @author Yegor Bugayenko (yegor@tpc2.com)
50   * @version $Id$
51   */
52  @Path("/c/{cnt}")
53  public final class CounterRs extends BaseRs {
54  
55      /**
56       * The counter we're working with.
57       */
58      private transient Counter counter;
59  
60      /**
61       * Set counter.
62       * @param name Counter name
63       */
64      @PathParam("cnt")
65      public void setCounter(final String name) {
66          this.counter = this.user().counters().get(name);
67      }
68  
69      /**
70       * Set counter.
71       * @param value Value to set
72       * @return The JAX-RS response
73       * @throws IOException If fails due to IO problem
74       */
75      @PUT
76      @Path("/set")
77      public Response set(@QueryParam("value") final String value)
78          throws IOException {
79          this.counter.set(this.decimal(value));
80          return Response.ok().build();
81      }
82  
83      /**
84       * Add counter.
85       * @param value Value to add
86       * @return The JAX-RS response
87       * @throws IOException If fails due to IO problem
88       */
89      @GET
90      @Path("/inc")
91      @Produces(MediaType.TEXT_PLAIN)
92      public Response increment(@QueryParam("value") final String value)
93          throws IOException {
94          return Response.ok()
95              .entity(this.counter.increment(this.decimal(value)).toString())
96              .build();
97      }
98  
99      /**
100      * Convert string to decimal.
101      * @param text Text to convert
102      * @return Decimal
103      */
104     private BigDecimal decimal(final String text) {
105         if (!text.matches("-?[0-9]{1,32}")) {
106             throw new WebApplicationException(
107                 Response.status(HttpURLConnection.HTTP_BAD_REQUEST)
108                     .entity("1-32 integer allowed as a value")
109                     .build()
110             );
111         }
112         return new BigDecimal(text);
113     }
114 
115 }