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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<span class="sourceLineNo">003</span> * contributor license agreements. See the NOTICE file distributed with<a name="line.3"></a>
<span class="sourceLineNo">004</span> * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<span class="sourceLineNo">005</span> * The ASF licenses this file to You under the Apache license, Version 2.0<a name="line.5"></a>
<span class="sourceLineNo">006</span> * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<span class="sourceLineNo">007</span> * the License. You may obtain a copy of the License at<a name="line.7"></a>
<span class="sourceLineNo">008</span> *<a name="line.8"></a>
<span class="sourceLineNo">009</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<span class="sourceLineNo">010</span> *<a name="line.10"></a>
<span class="sourceLineNo">011</span> * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<span class="sourceLineNo">012</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<span class="sourceLineNo">013</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<span class="sourceLineNo">014</span> * See the license for the specific language governing permissions and<a name="line.14"></a>
<span class="sourceLineNo">015</span> * limitations under the license.<a name="line.15"></a>
<span class="sourceLineNo">016</span> */<a name="line.16"></a>
<span class="sourceLineNo">017</span>package org.apache.logging.log4j.spi;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import java.util.ArrayList;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.util.Collection;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.util.Iterator;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.util.List;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>import org.apache.logging.log4j.ThreadContext.ContextStack;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.apache.logging.log4j.util.StringBuilderFormattable;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>/**<a name="line.27"></a>
<span class="sourceLineNo">028</span> * TODO<a name="line.28"></a>
<span class="sourceLineNo">029</span> */<a name="line.29"></a>
<span class="sourceLineNo">030</span>public class MutableThreadContextStack implements ThreadContextStack, StringBuilderFormattable {<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span> private static final long serialVersionUID = 50505011L;<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span> /**<a name="line.34"></a>
<span class="sourceLineNo">035</span> * The underlying list (never null).<a name="line.35"></a>
<span class="sourceLineNo">036</span> */<a name="line.36"></a>
<span class="sourceLineNo">037</span> private final List&lt;String&gt; list;<a name="line.37"></a>
<span class="sourceLineNo">038</span> private boolean frozen;<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span> /**<a name="line.40"></a>
<span class="sourceLineNo">041</span> * Constructs an empty MutableThreadContextStack.<a name="line.41"></a>
<span class="sourceLineNo">042</span> */<a name="line.42"></a>
<span class="sourceLineNo">043</span> public MutableThreadContextStack() {<a name="line.43"></a>
<span class="sourceLineNo">044</span> this(new ArrayList&lt;String&gt;());<a name="line.44"></a>
<span class="sourceLineNo">045</span> }<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span> /**<a name="line.47"></a>
<span class="sourceLineNo">048</span> * Constructs a new instance.<a name="line.48"></a>
<span class="sourceLineNo">049</span> * @param list<a name="line.49"></a>
<span class="sourceLineNo">050</span> */<a name="line.50"></a>
<span class="sourceLineNo">051</span> public MutableThreadContextStack(final List&lt;String&gt; list) {<a name="line.51"></a>
<span class="sourceLineNo">052</span> this.list = new ArrayList&lt;&gt;(list);<a name="line.52"></a>
<span class="sourceLineNo">053</span> }<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>
<span class="sourceLineNo">055</span> private MutableThreadContextStack(final MutableThreadContextStack stack) {<a name="line.55"></a>
<span class="sourceLineNo">056</span> this.list = new ArrayList&lt;&gt;(stack.list);<a name="line.56"></a>
<span class="sourceLineNo">057</span> }<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span> private void checkInvariants() {<a name="line.59"></a>
<span class="sourceLineNo">060</span> if (frozen) {<a name="line.60"></a>
<span class="sourceLineNo">061</span> throw new UnsupportedOperationException("context stack has been frozen");<a name="line.61"></a>
<span class="sourceLineNo">062</span> }<a name="line.62"></a>
<span class="sourceLineNo">063</span> }<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span> @Override<a name="line.65"></a>
<span class="sourceLineNo">066</span> public String pop() {<a name="line.66"></a>
<span class="sourceLineNo">067</span> checkInvariants();<a name="line.67"></a>
<span class="sourceLineNo">068</span> if (list.isEmpty()) {<a name="line.68"></a>
<span class="sourceLineNo">069</span> return null;<a name="line.69"></a>
<span class="sourceLineNo">070</span> }<a name="line.70"></a>
<span class="sourceLineNo">071</span> final int last = list.size() - 1;<a name="line.71"></a>
<span class="sourceLineNo">072</span> final String result = list.remove(last);<a name="line.72"></a>
<span class="sourceLineNo">073</span> return result;<a name="line.73"></a>
<span class="sourceLineNo">074</span> }<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span> @Override<a name="line.76"></a>
<span class="sourceLineNo">077</span> public String peek() {<a name="line.77"></a>
<span class="sourceLineNo">078</span> if (list.isEmpty()) {<a name="line.78"></a>
<span class="sourceLineNo">079</span> return null;<a name="line.79"></a>
<span class="sourceLineNo">080</span> }<a name="line.80"></a>
<span class="sourceLineNo">081</span> final int last = list.size() - 1;<a name="line.81"></a>
<span class="sourceLineNo">082</span> return list.get(last);<a name="line.82"></a>
<span class="sourceLineNo">083</span> }<a name="line.83"></a>
<span class="sourceLineNo">084</span><a name="line.84"></a>
<span class="sourceLineNo">085</span> @Override<a name="line.85"></a>
<span class="sourceLineNo">086</span> public void push(final String message) {<a name="line.86"></a>
<span class="sourceLineNo">087</span> checkInvariants();<a name="line.87"></a>
<span class="sourceLineNo">088</span> list.add(message);<a name="line.88"></a>
<span class="sourceLineNo">089</span> }<a name="line.89"></a>
<span class="sourceLineNo">090</span><a name="line.90"></a>
<span class="sourceLineNo">091</span> @Override<a name="line.91"></a>
<span class="sourceLineNo">092</span> public int getDepth() {<a name="line.92"></a>
<span class="sourceLineNo">093</span> return list.size();<a name="line.93"></a>
<span class="sourceLineNo">094</span> }<a name="line.94"></a>
<span class="sourceLineNo">095</span><a name="line.95"></a>
<span class="sourceLineNo">096</span> @Override<a name="line.96"></a>
<span class="sourceLineNo">097</span> public List&lt;String&gt; asList() {<a name="line.97"></a>
<span class="sourceLineNo">098</span> return list;<a name="line.98"></a>
<span class="sourceLineNo">099</span> }<a name="line.99"></a>
<span class="sourceLineNo">100</span><a name="line.100"></a>
<span class="sourceLineNo">101</span> @Override<a name="line.101"></a>
<span class="sourceLineNo">102</span> public void trim(final int depth) {<a name="line.102"></a>
<span class="sourceLineNo">103</span> checkInvariants();<a name="line.103"></a>
<span class="sourceLineNo">104</span> if (depth &lt; 0) {<a name="line.104"></a>
<span class="sourceLineNo">105</span> throw new IllegalArgumentException("Maximum stack depth cannot be negative");<a name="line.105"></a>
<span class="sourceLineNo">106</span> }<a name="line.106"></a>
<span class="sourceLineNo">107</span> if (list == null) {<a name="line.107"></a>
<span class="sourceLineNo">108</span> return;<a name="line.108"></a>
<span class="sourceLineNo">109</span> }<a name="line.109"></a>
<span class="sourceLineNo">110</span> final List&lt;String&gt; copy = new ArrayList&lt;&gt;(list.size());<a name="line.110"></a>
<span class="sourceLineNo">111</span> final int count = Math.min(depth, list.size());<a name="line.111"></a>
<span class="sourceLineNo">112</span> for (int i = 0; i &lt; count; i++) {<a name="line.112"></a>
<span class="sourceLineNo">113</span> copy.add(list.get(i));<a name="line.113"></a>
<span class="sourceLineNo">114</span> }<a name="line.114"></a>
<span class="sourceLineNo">115</span> list.clear();<a name="line.115"></a>
<span class="sourceLineNo">116</span> list.addAll(copy);<a name="line.116"></a>
<span class="sourceLineNo">117</span> }<a name="line.117"></a>
<span class="sourceLineNo">118</span><a name="line.118"></a>
<span class="sourceLineNo">119</span> @Override<a name="line.119"></a>
<span class="sourceLineNo">120</span> public ThreadContextStack copy() {<a name="line.120"></a>
<span class="sourceLineNo">121</span> return new MutableThreadContextStack(this);<a name="line.121"></a>
<span class="sourceLineNo">122</span> }<a name="line.122"></a>
<span class="sourceLineNo">123</span><a name="line.123"></a>
<span class="sourceLineNo">124</span> @Override<a name="line.124"></a>
<span class="sourceLineNo">125</span> public void clear() {<a name="line.125"></a>
<span class="sourceLineNo">126</span> checkInvariants();<a name="line.126"></a>
<span class="sourceLineNo">127</span> list.clear();<a name="line.127"></a>
<span class="sourceLineNo">128</span> }<a name="line.128"></a>
<span class="sourceLineNo">129</span><a name="line.129"></a>
<span class="sourceLineNo">130</span> @Override<a name="line.130"></a>
<span class="sourceLineNo">131</span> public int size() {<a name="line.131"></a>
<span class="sourceLineNo">132</span> return list.size();<a name="line.132"></a>
<span class="sourceLineNo">133</span> }<a name="line.133"></a>
<span class="sourceLineNo">134</span><a name="line.134"></a>
<span class="sourceLineNo">135</span> @Override<a name="line.135"></a>
<span class="sourceLineNo">136</span> public boolean isEmpty() {<a name="line.136"></a>
<span class="sourceLineNo">137</span> return list.isEmpty();<a name="line.137"></a>
<span class="sourceLineNo">138</span> }<a name="line.138"></a>
<span class="sourceLineNo">139</span><a name="line.139"></a>
<span class="sourceLineNo">140</span> @Override<a name="line.140"></a>
<span class="sourceLineNo">141</span> public boolean contains(final Object o) {<a name="line.141"></a>
<span class="sourceLineNo">142</span> return list.contains(o);<a name="line.142"></a>
<span class="sourceLineNo">143</span> }<a name="line.143"></a>
<span class="sourceLineNo">144</span><a name="line.144"></a>
<span class="sourceLineNo">145</span> @Override<a name="line.145"></a>
<span class="sourceLineNo">146</span> public Iterator&lt;String&gt; iterator() {<a name="line.146"></a>
<span class="sourceLineNo">147</span> return list.iterator();<a name="line.147"></a>
<span class="sourceLineNo">148</span> }<a name="line.148"></a>
<span class="sourceLineNo">149</span><a name="line.149"></a>
<span class="sourceLineNo">150</span> @Override<a name="line.150"></a>
<span class="sourceLineNo">151</span> public Object[] toArray() {<a name="line.151"></a>
<span class="sourceLineNo">152</span> return list.toArray();<a name="line.152"></a>
<span class="sourceLineNo">153</span> }<a name="line.153"></a>
<span class="sourceLineNo">154</span><a name="line.154"></a>
<span class="sourceLineNo">155</span> @Override<a name="line.155"></a>
<span class="sourceLineNo">156</span> public &lt;T&gt; T[] toArray(final T[] ts) {<a name="line.156"></a>
<span class="sourceLineNo">157</span> return list.toArray(ts);<a name="line.157"></a>
<span class="sourceLineNo">158</span> }<a name="line.158"></a>
<span class="sourceLineNo">159</span><a name="line.159"></a>
<span class="sourceLineNo">160</span> @Override<a name="line.160"></a>
<span class="sourceLineNo">161</span> public boolean add(final String s) {<a name="line.161"></a>
<span class="sourceLineNo">162</span> checkInvariants();<a name="line.162"></a>
<span class="sourceLineNo">163</span> return list.add(s);<a name="line.163"></a>
<span class="sourceLineNo">164</span> }<a name="line.164"></a>
<span class="sourceLineNo">165</span><a name="line.165"></a>
<span class="sourceLineNo">166</span> @Override<a name="line.166"></a>
<span class="sourceLineNo">167</span> public boolean remove(final Object o) {<a name="line.167"></a>
<span class="sourceLineNo">168</span> checkInvariants();<a name="line.168"></a>
<span class="sourceLineNo">169</span> return list.remove(o);<a name="line.169"></a>
<span class="sourceLineNo">170</span> }<a name="line.170"></a>
<span class="sourceLineNo">171</span><a name="line.171"></a>
<span class="sourceLineNo">172</span> @Override<a name="line.172"></a>
<span class="sourceLineNo">173</span> public boolean containsAll(final Collection&lt;?&gt; objects) {<a name="line.173"></a>
<span class="sourceLineNo">174</span> return list.containsAll(objects);<a name="line.174"></a>
<span class="sourceLineNo">175</span> }<a name="line.175"></a>
<span class="sourceLineNo">176</span><a name="line.176"></a>
<span class="sourceLineNo">177</span> @Override<a name="line.177"></a>
<span class="sourceLineNo">178</span> public boolean addAll(final Collection&lt;? extends String&gt; strings) {<a name="line.178"></a>
<span class="sourceLineNo">179</span> checkInvariants();<a name="line.179"></a>
<span class="sourceLineNo">180</span> return list.addAll(strings);<a name="line.180"></a>
<span class="sourceLineNo">181</span> }<a name="line.181"></a>
<span class="sourceLineNo">182</span><a name="line.182"></a>
<span class="sourceLineNo">183</span> @Override<a name="line.183"></a>
<span class="sourceLineNo">184</span> public boolean removeAll(final Collection&lt;?&gt; objects) {<a name="line.184"></a>
<span class="sourceLineNo">185</span> checkInvariants();<a name="line.185"></a>
<span class="sourceLineNo">186</span> return list.removeAll(objects);<a name="line.186"></a>
<span class="sourceLineNo">187</span> }<a name="line.187"></a>
<span class="sourceLineNo">188</span><a name="line.188"></a>
<span class="sourceLineNo">189</span> @Override<a name="line.189"></a>
<span class="sourceLineNo">190</span> public boolean retainAll(final Collection&lt;?&gt; objects) {<a name="line.190"></a>
<span class="sourceLineNo">191</span> checkInvariants();<a name="line.191"></a>
<span class="sourceLineNo">192</span> return list.retainAll(objects);<a name="line.192"></a>
<span class="sourceLineNo">193</span> }<a name="line.193"></a>
<span class="sourceLineNo">194</span><a name="line.194"></a>
<span class="sourceLineNo">195</span> @Override<a name="line.195"></a>
<span class="sourceLineNo">196</span> public String toString() {<a name="line.196"></a>
<span class="sourceLineNo">197</span> return String.valueOf(list);<a name="line.197"></a>
<span class="sourceLineNo">198</span> }<a name="line.198"></a>
<span class="sourceLineNo">199</span><a name="line.199"></a>
<span class="sourceLineNo">200</span> @Override<a name="line.200"></a>
<span class="sourceLineNo">201</span> public void formatTo(final StringBuilder buffer) {<a name="line.201"></a>
<span class="sourceLineNo">202</span> buffer.append('[');<a name="line.202"></a>
<span class="sourceLineNo">203</span> for (int i = 0; i &lt; list.size(); i++) {<a name="line.203"></a>
<span class="sourceLineNo">204</span> if (i &gt; 0) {<a name="line.204"></a>
<span class="sourceLineNo">205</span> buffer.append(',').append(' ');<a name="line.205"></a>
<span class="sourceLineNo">206</span> }<a name="line.206"></a>
<span class="sourceLineNo">207</span> buffer.append(list.get(i));<a name="line.207"></a>
<span class="sourceLineNo">208</span> }<a name="line.208"></a>
<span class="sourceLineNo">209</span> buffer.append(']');<a name="line.209"></a>
<span class="sourceLineNo">210</span> }<a name="line.210"></a>
<span class="sourceLineNo">211</span><a name="line.211"></a>
<span class="sourceLineNo">212</span> @Override<a name="line.212"></a>
<span class="sourceLineNo">213</span> public int hashCode() {<a name="line.213"></a>
<span class="sourceLineNo">214</span> final int prime = 31;<a name="line.214"></a>
<span class="sourceLineNo">215</span> int result = 1;<a name="line.215"></a>
<span class="sourceLineNo">216</span> result = prime * result + ((this.list == null) ? 0 : this.list.hashCode());<a name="line.216"></a>
<span class="sourceLineNo">217</span> return result;<a name="line.217"></a>
<span class="sourceLineNo">218</span> }<a name="line.218"></a>
<span class="sourceLineNo">219</span><a name="line.219"></a>
<span class="sourceLineNo">220</span> @Override<a name="line.220"></a>
<span class="sourceLineNo">221</span> public boolean equals(final Object obj) {<a name="line.221"></a>
<span class="sourceLineNo">222</span> if (this == obj) {<a name="line.222"></a>
<span class="sourceLineNo">223</span> return true;<a name="line.223"></a>
<span class="sourceLineNo">224</span> }<a name="line.224"></a>
<span class="sourceLineNo">225</span> if (obj == null) {<a name="line.225"></a>
<span class="sourceLineNo">226</span> return false;<a name="line.226"></a>
<span class="sourceLineNo">227</span> }<a name="line.227"></a>
<span class="sourceLineNo">228</span> if (!(obj instanceof ThreadContextStack)) {<a name="line.228"></a>
<span class="sourceLineNo">229</span> return false;<a name="line.229"></a>
<span class="sourceLineNo">230</span> }<a name="line.230"></a>
<span class="sourceLineNo">231</span> final ThreadContextStack other = (ThreadContextStack) obj;<a name="line.231"></a>
<span class="sourceLineNo">232</span> final List&lt;String&gt; otherAsList = other.asList();<a name="line.232"></a>
<span class="sourceLineNo">233</span> if (this.list == null) {<a name="line.233"></a>
<span class="sourceLineNo">234</span> if (otherAsList != null) {<a name="line.234"></a>
<span class="sourceLineNo">235</span> return false;<a name="line.235"></a>
<span class="sourceLineNo">236</span> }<a name="line.236"></a>
<span class="sourceLineNo">237</span> } else if (!this.list.equals(otherAsList)) {<a name="line.237"></a>
<span class="sourceLineNo">238</span> return false;<a name="line.238"></a>
<span class="sourceLineNo">239</span> }<a name="line.239"></a>
<span class="sourceLineNo">240</span> return true;<a name="line.240"></a>
<span class="sourceLineNo">241</span> }<a name="line.241"></a>
<span class="sourceLineNo">242</span><a name="line.242"></a>
<span class="sourceLineNo">243</span> @Override<a name="line.243"></a>
<span class="sourceLineNo">244</span> public ContextStack getImmutableStackOrNull() {<a name="line.244"></a>
<span class="sourceLineNo">245</span> return copy();<a name="line.245"></a>
<span class="sourceLineNo">246</span> }<a name="line.246"></a>
<span class="sourceLineNo">247</span><a name="line.247"></a>
<span class="sourceLineNo">248</span> /**<a name="line.248"></a>
<span class="sourceLineNo">249</span> * "Freezes" this context stack so it becomes immutable: all mutator methods will throw an exception from now on.<a name="line.249"></a>
<span class="sourceLineNo">250</span> */<a name="line.250"></a>
<span class="sourceLineNo">251</span> public void freeze() {<a name="line.251"></a>
<span class="sourceLineNo">252</span> frozen = true;<a name="line.252"></a>
<span class="sourceLineNo">253</span> }<a name="line.253"></a>
<span class="sourceLineNo">254</span><a name="line.254"></a>
<span class="sourceLineNo">255</span> /**<a name="line.255"></a>
<span class="sourceLineNo">256</span> * Returns whether this context stack is frozen.<a name="line.256"></a>
<span class="sourceLineNo">257</span> * @return whether this context stack is frozen.<a name="line.257"></a>
<span class="sourceLineNo">258</span> */<a name="line.258"></a>
<span class="sourceLineNo">259</span> public boolean isFrozen() {<a name="line.259"></a>
<span class="sourceLineNo">260</span> return frozen;<a name="line.260"></a>
<span class="sourceLineNo">261</span> }<a name="line.261"></a>
<span class="sourceLineNo">262</span>}<a name="line.262"></a>
</pre>
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