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<div class="title">DisjointSet.java</div> </div>
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<a href="DisjointSet_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>&#160;<span class="comment">// Copyright 2012 Cloudera Inc.</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment">// Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<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>&#160;<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>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<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>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<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>&#160;<span class="comment">// distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<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>&#160;<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>&#160;<span class="comment">// limitations under the License.</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;</div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="keyword">package </span>com.cloudera.impala.util;</div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;</div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="keyword">import</span> java.util.Collection;</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="keyword">import</span> java.util.Iterator;</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="keyword">import</span> java.util.Map;</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="keyword">import</span> java.util.Set;</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;<span class="keyword">import</span> com.google.common.collect.Maps;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="keyword">import</span> com.google.common.collect.Sets;</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;</div>
<div class="line"><a name="l00032"></a><span class="lineno"><a class="line" href="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4.html"> 32</a></span>&#160;<span class="keyword">public</span> <span class="keyword">class </span>DisjointSet&lt;T&gt; {</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; <span class="comment">// Maps from an item to its item set.</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"><a class="line" href="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4.html#a17e1dde3e6b71d0ae5a0eb6e46cadd60"> 34</a></span>&#160; <span class="keyword">private</span> <span class="keyword">final</span> Map&lt;T, Set&lt;T&gt;&gt; itemSets_ = Maps.newHashMap();</div>
<div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4.html#acf90014522eb570fa3eb4c3fb3c40483"> 35</a></span>&#160; <span class="keyword">private</span> <span class="keyword">final</span> Set&lt;Set&lt;T&gt;&gt; uniqueSets_ = Sets.newHashSet();</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;</div>
<div class="line"><a name="l00041"></a><span class="lineno"><a class="line" href="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4.html#a09a8f60f796cffbacfa5b8fb95ed9c21"> 41</a></span>&#160; <span class="keyword">public</span> Set&lt;T&gt; <span class="keyword">get</span>(T item) { <span class="keywordflow">return</span> itemSets_.get(item); }</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;</div>
<div class="line"><a name="l00043"></a><span class="lineno"><a class="line" href="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4.html#af7cd68f96f0577938723310ea91c84e5"> 43</a></span>&#160; <span class="keyword">public</span> Set&lt;Set&lt;T&gt;&gt; <a class="code" href="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4.html#af7cd68f96f0577938723310ea91c84e5">getSets</a>() { <span class="keywordflow">return</span> uniqueSets_; }</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160;</div>
<div class="line"><a name="l00049"></a><span class="lineno"><a class="line" href="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4.html#ad5da085381b6cc6ca9d5dd87dfc44bd7"> 49</a></span>&#160; <span class="keyword">public</span> Set&lt;T&gt; <a class="code" href="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4.html#ad5da085381b6cc6ca9d5dd87dfc44bd7">makeSet</a>(T item) {</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; <span class="keywordflow">if</span> (itemSets_.containsKey(item)) {</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; <span class="keywordflow">throw</span> <span class="keyword">new</span> IllegalStateException(</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; <span class="stringliteral">&quot;Item set for item already exists: &quot;</span> + item.toString());</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; }</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; Set&lt;T&gt; s = Sets.newHashSet(item);</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; itemSets_.put(item, s);</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; uniqueSets_.add(s);</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; <span class="keywordflow">return</span> s;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; }</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;</div>
<div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4.html#a3cdbb609ccc0c37a9ad25a42d0ffe889"> 66</a></span>&#160; <span class="keyword">public</span> <span class="keywordtype">boolean</span> <span class="keyword">union</span>(T a, T b) {</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; Set&lt;T&gt; aItems = itemSets_.get(a);</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; Set&lt;T&gt; bItems = itemSets_.get(b);</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; <span class="comment">// check if the sets are already identical</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; <span class="keywordflow">if</span> (aItems != null &amp;&amp; bItems != null &amp;&amp; aItems == bItems) <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; <span class="comment">// union(x, x) is equivalent to makeSet(x)</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <span class="keywordflow">if</span> (a.equals(b) &amp;&amp; aItems == null) {</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; makeSet(a);</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; }</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; <span class="comment">// create sets for a or b if not present already</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; <span class="keywordflow">if</span> (aItems == null) aItems = makeSet(a);</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; <span class="keywordflow">if</span> (bItems == null) bItems = makeSet(b);</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; <span class="comment">// will contain the union of aItems and bItems</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; Set&lt;T&gt; mergedItems = aItems;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; <span class="comment">// always the smaller of the two sets to be merged</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; Set&lt;T&gt; updateItems = bItems;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; <span class="keywordflow">if</span> (bItems.size() &gt; aItems.size()) {</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; mergedItems = bItems;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; updateItems = aItems;</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; }</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; <span class="keywordflow">for</span> (T item: updateItems) {</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; mergedItems.add(item);</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; itemSets_.put(item, mergedItems);</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; }</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; uniqueSets_.remove(updateItems);</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; }</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160;</div>
<div class="line"><a name="l00102"></a><span class="lineno"><a class="line" href="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4.html#a1dc709681aa02735a5c7f568b706b42a"> 102</a></span>&#160; <span class="keyword">public</span> <span class="keywordtype">boolean</span> <a class="code" href="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4.html#a1dc709681aa02735a5c7f568b706b42a">bulkUnion</a>(Collection&lt;T&gt; items) {</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; <span class="keywordflow">if</span> (items.isEmpty()) <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; Iterator&lt;T&gt; it = items.iterator();</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; T head = it.next();</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; <span class="comment">// bulkUnion(x) is equivalent to makeSet(x)</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; <span class="keywordflow">if</span> (!it.hasNext()) {</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; <span class="keywordflow">if</span> (<span class="keyword">get</span>(head) != null) <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; makeSet(head);</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; }</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; <span class="keywordtype">boolean</span> result = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; <span class="keywordflow">while</span>(it.hasNext()) {</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; <span class="keywordtype">boolean</span> changed = <span class="keyword">union</span>(head, it.next());</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; result = result || changed;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; }</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; <span class="keywordflow">return</span> result;</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160; }</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160;</div>
<div class="line"><a name="l00124"></a><span class="lineno"><a class="line" href="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4.html#acfa566b3ba30084c62df5b8fd6c30e02"> 124</a></span>&#160; <span class="keyword">public</span> <span class="keywordtype">void</span> <a class="code" href="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4.html#acfa566b3ba30084c62df5b8fd6c30e02">checkConsistency</a>() {</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160; Set&lt;Set&lt;T&gt;&gt; validatedSets = Sets.newHashSet();</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; <span class="keywordflow">for</span> (Set&lt;T&gt; itemSet: itemSets_.values()) {</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; <span class="comment">// Avoid checking the same item set multiple times.</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160; <span class="keywordflow">if</span> (validatedSets.contains(itemSet)) <span class="keywordflow">continue</span>;</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; <span class="comment">// Validate that all items in this set are properly mapped to</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160; <span class="comment">// the set itself.</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160; <span class="keywordflow">for</span> (T item: itemSet) {</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160; <span class="keywordflow">if</span> (itemSet != itemSets_.get(item)) {</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160; <span class="keywordflow">throw</span> <span class="keyword">new</span> IllegalStateException(<span class="stringliteral">&quot;DisjointSet is in an inconsistent state.&quot;</span>);</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160; }</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160; }</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160; validatedSets.add(itemSet);</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160; }</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160; }</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160;}</div>
<div class="ttc" id="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4_html_ad5da085381b6cc6ca9d5dd87dfc44bd7"><div class="ttname"><a href="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4.html#ad5da085381b6cc6ca9d5dd87dfc44bd7">com.cloudera.impala.util.DisjointSet&lt; T &gt;.makeSet</a></div><div class="ttdeci">Set&lt; T &gt; makeSet(T item)</div><div class="ttdef"><b>Definition:</b> <a href="DisjointSet_8java_source.html#l00049">DisjointSet.java:49</a></div></div>
<div class="ttc" id="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4_html_a1dc709681aa02735a5c7f568b706b42a"><div class="ttname"><a href="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4.html#a1dc709681aa02735a5c7f568b706b42a">com.cloudera.impala.util.DisjointSet&lt; T &gt;.bulkUnion</a></div><div class="ttdeci">boolean bulkUnion(Collection&lt; T &gt; items)</div><div class="ttdef"><b>Definition:</b> <a href="DisjointSet_8java_source.html#l00102">DisjointSet.java:102</a></div></div>
<div class="ttc" id="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4_html_af7cd68f96f0577938723310ea91c84e5"><div class="ttname"><a href="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4.html#af7cd68f96f0577938723310ea91c84e5">com.cloudera.impala.util.DisjointSet&lt; T &gt;.getSets</a></div><div class="ttdeci">Set&lt; Set&lt; T &gt; &gt; getSets()</div><div class="ttdef"><b>Definition:</b> <a href="DisjointSet_8java_source.html#l00043">DisjointSet.java:43</a></div></div>
<div class="ttc" id="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4_html_acfa566b3ba30084c62df5b8fd6c30e02"><div class="ttname"><a href="classcom_1_1cloudera_1_1impala_1_1util_1_1DisjointSet_3_01T_01_4.html#acfa566b3ba30084c62df5b8fd6c30e02">com.cloudera.impala.util.DisjointSet&lt; T &gt;.checkConsistency</a></div><div class="ttdeci">void checkConsistency()</div><div class="ttdef"><b>Definition:</b> <a href="DisjointSet_8java_source.html#l00124">DisjointSet.java:124</a></div></div>
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