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| <div class="title">AliasGenerator.java</div> </div> |
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| <a href="AliasGenerator_8java.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2014 Cloudera Inc.</span></div> |
| <div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">//</span></div> |
| <div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span></div> |
| <div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// you may not use this file except in compliance with the License.</span></div> |
| <div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// You may obtain a copy of the License at</span></div> |
| <div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">//</span></div> |
| <div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div> |
| <div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">//</span></div> |
| <div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div> |
| <div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span></div> |
| <div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div> |
| <div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// See the License for the specific language governing permissions and</span></div> |
| <div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">// limitations under the License.</span></div> |
| <div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div> |
| <div class="line"><a name="l00015"></a><span class="lineno"><a class="line" href="namespacecom_1_1cloudera_1_1impala_1_1common.html"> 15</a></span> <span class="keyword">package </span>com.cloudera.impala.common;</div> |
| <div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div> |
| <div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">import</span> java.util.Set;</div> |
| <div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div> |
| <div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">import</span> com.google.common.base.Preconditions;</div> |
| <div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">import</span> com.google.common.collect.Sets;</div> |
| <div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div> |
| <div class="line"><a name="l00027"></a><span class="lineno"><a class="line" href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html"> 27</a></span> <span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keyword">class </span><a class="code" href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html">AliasGenerator</a> {</div> |
| <div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html#a12416fefb49e4688326d11351ff96b0b"> 28</a></span>  <span class="keyword">private</span> <span class="keywordtype">int</span> <a class="code" href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html#a12416fefb49e4688326d11351ff96b0b">numGeneratedAliases_</a> = 1;</div> |
| <div class="line"><a name="l00029"></a><span class="lineno"><a class="line" href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html#a859d01096a150b4799a8104839a223ea"> 29</a></span>  <span class="keyword">protected</span> String <a class="code" href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html#a859d01096a150b4799a8104839a223ea">aliasPrefix_</a> = null;</div> |
| <div class="line"><a name="l00030"></a><span class="lineno"><a class="line" href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html#a8953378ea60485551143749cb3f0faa9"> 30</a></span>  <span class="keyword">protected</span> Set<String> <a class="code" href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html#a8953378ea60485551143749cb3f0faa9">usedAliases_</a> = Sets.newHashSet();</div> |
| <div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div> |
| <div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html#aa14a81be365a3b411262596cba59a37c"> 35</a></span>  <span class="keyword">public</span> String <a class="code" href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html#aa14a81be365a3b411262596cba59a37c">getNextAlias</a>() {</div> |
| <div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  Preconditions.checkNotNull(<a class="code" href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html#a859d01096a150b4799a8104839a223ea">aliasPrefix_</a>);</div> |
| <div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordflow">while</span> (<span class="keyword">true</span>) {</div> |
| <div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  String candidateAlias = <a class="code" href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html#a859d01096a150b4799a8104839a223ea">aliasPrefix_</a> + Integer.toString(<a class="code" href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html#a12416fefb49e4688326d11351ff96b0b">numGeneratedAliases_</a>++);</div> |
| <div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">if</span> (<a class="code" href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html#a8953378ea60485551143749cb3f0faa9">usedAliases_</a>.add(candidateAlias)) <span class="keywordflow">return</span> candidateAlias;</div> |
| <div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordflow">if</span> (<a class="code" href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html#a12416fefb49e4688326d11351ff96b0b">numGeneratedAliases_</a> < 0) {</div> |
| <div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordflow">throw</span> <span class="keyword">new</span> IllegalStateException(<span class="stringliteral">"Overflow occured during alias generation."</span>);</div> |
| <div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  }</div> |
| <div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  }</div> |
| <div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  }</div> |
| <div class="line"><a name="l00045"></a><span class="lineno"> 45</span> }</div> |
| <div class="ttc" id="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator_html_aa14a81be365a3b411262596cba59a37c"><div class="ttname"><a href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html#aa14a81be365a3b411262596cba59a37c">com.cloudera.impala.common.AliasGenerator.getNextAlias</a></div><div class="ttdeci">String getNextAlias()</div><div class="ttdef"><b>Definition:</b> <a href="AliasGenerator_8java_source.html#l00035">AliasGenerator.java:35</a></div></div> |
| <div class="ttc" id="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator_html_a8953378ea60485551143749cb3f0faa9"><div class="ttname"><a href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html#a8953378ea60485551143749cb3f0faa9">com.cloudera.impala.common.AliasGenerator.usedAliases_</a></div><div class="ttdeci">Set< String > usedAliases_</div><div class="ttdef"><b>Definition:</b> <a href="AliasGenerator_8java_source.html#l00030">AliasGenerator.java:30</a></div></div> |
| <div class="ttc" id="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator_html_a859d01096a150b4799a8104839a223ea"><div class="ttname"><a href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html#a859d01096a150b4799a8104839a223ea">com.cloudera.impala.common.AliasGenerator.aliasPrefix_</a></div><div class="ttdeci">String aliasPrefix_</div><div class="ttdef"><b>Definition:</b> <a href="AliasGenerator_8java_source.html#l00029">AliasGenerator.java:29</a></div></div> |
| <div class="ttc" id="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator_html_a12416fefb49e4688326d11351ff96b0b"><div class="ttname"><a href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html#a12416fefb49e4688326d11351ff96b0b">com.cloudera.impala.common.AliasGenerator.numGeneratedAliases_</a></div><div class="ttdeci">int numGeneratedAliases_</div><div class="ttdef"><b>Definition:</b> <a href="AliasGenerator_8java_source.html#l00028">AliasGenerator.java:28</a></div></div> |
| <div class="ttc" id="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator_html"><div class="ttname"><a href="classcom_1_1cloudera_1_1impala_1_1common_1_1AliasGenerator.html">com.cloudera.impala.common.AliasGenerator</a></div><div class="ttdef"><b>Definition:</b> <a href="AliasGenerator_8java_source.html#l00027">AliasGenerator.java:27</a></div></div> |
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