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<a class="jxr_linenumber" name="L1" href="#L1">1</a> <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="L2" href="#L2">2</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</em>
<a class="jxr_linenumber" name="L3" href="#L3">3</a> <em class="jxr_comment"> * contributor license agreements. See the NOTICE file distributed with</em>
<a class="jxr_linenumber" name="L4" href="#L4">4</a> <em class="jxr_comment"> * this work for additional information regarding copyright ownership.</em>
<a class="jxr_linenumber" name="L5" href="#L5">5</a> <em class="jxr_comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</em>
<a class="jxr_linenumber" name="L6" href="#L6">6</a> <em class="jxr_comment"> * (the "License"); you may not use this file except in compliance with</em>
<a class="jxr_linenumber" name="L7" href="#L7">7</a> <em class="jxr_comment"> * the License. You may obtain a copy of the License at</em>
<a class="jxr_linenumber" name="L8" href="#L8">8</a> <em class="jxr_comment"> * </em>
<a class="jxr_linenumber" name="L9" href="#L9">9</a> <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2." target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.</a>0</em>
<a class="jxr_linenumber" name="L10" href="#L10">10</a> <em class="jxr_comment"> * </em>
<a class="jxr_linenumber" name="L11" href="#L11">11</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="L12" href="#L12">12</a> <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a class="jxr_linenumber" name="L13" href="#L13">13</a> <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a class="jxr_linenumber" name="L14" href="#L14">14</a> <em class="jxr_comment"> * See the License for the specific language governing permissions and</em>
<a class="jxr_linenumber" name="L15" href="#L15">15</a> <em class="jxr_comment"> * limitations under the License.</em>
<a class="jxr_linenumber" name="L16" href="#L16">16</a> <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="L17" href="#L17">17</a>
<a class="jxr_linenumber" name="L18" href="#L18">18</a> <strong class="jxr_keyword">package</strong> org.apache.log4j.helpers;
<a class="jxr_linenumber" name="L19" href="#L19">19</a>
<a class="jxr_linenumber" name="L20" href="#L20">20</a>
<a class="jxr_linenumber" name="L21" href="#L21">21</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L22" href="#L22">22</a> <em class="jxr_javadoccomment"> * Formats messages according to very simple rules.</em>
<a class="jxr_linenumber" name="L23" href="#L23">23</a> <em class="jxr_javadoccomment"> * See {@link #format(String,Object)} and</em>
<a class="jxr_linenumber" name="L24" href="#L24">24</a> <em class="jxr_javadoccomment"> * {@link #format(String,Object,Object)} for more details.</em>
<a class="jxr_linenumber" name="L25" href="#L25">25</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L26" href="#L26">26</a> <em class="jxr_javadoccomment"> * @author Ceki G&amp;uuml;lc&amp;uuml;</em>
<a class="jxr_linenumber" name="L27" href="#L27">27</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L28" href="#L28">28</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/log4j/helpers/MessageFormatter.html">MessageFormatter</a> {
<a class="jxr_linenumber" name="L29" href="#L29">29</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L30" href="#L30">30</a> <em class="jxr_javadoccomment"> * Private formatter since all methods and members are static.</em>
<a class="jxr_linenumber" name="L31" href="#L31">31</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L32" href="#L32">32</a> <strong class="jxr_keyword">private</strong> <a href="../../../../org/apache/log4j/helpers/MessageFormatter.html">MessageFormatter</a>() {
<a class="jxr_linenumber" name="L33" href="#L33">33</a> <strong class="jxr_keyword">super</strong>();
<a class="jxr_linenumber" name="L34" href="#L34">34</a> }
<a class="jxr_linenumber" name="L35" href="#L35">35</a>
<a class="jxr_linenumber" name="L36" href="#L36">36</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L37" href="#L37">37</a> <em class="jxr_javadoccomment"> * Start of replacement block.</em>
<a class="jxr_linenumber" name="L38" href="#L38">38</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L39" href="#L39">39</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">char</strong> DELIM_START = '{';
<a class="jxr_linenumber" name="L40" href="#L40">40</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L41" href="#L41">41</a> <em class="jxr_javadoccomment"> * End of replacement block.</em>
<a class="jxr_linenumber" name="L42" href="#L42">42</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L43" href="#L43">43</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">char</strong> DELIM_STOP = '}';
<a class="jxr_linenumber" name="L44" href="#L44">44</a>
<a class="jxr_linenumber" name="L45" href="#L45">45</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L46" href="#L46">46</a> <em class="jxr_javadoccomment"> * Performs single argument substitution for the 'messagePattern' passed as</em>
<a class="jxr_linenumber" name="L47" href="#L47">47</a> <em class="jxr_javadoccomment"> * parameter.</em>
<a class="jxr_linenumber" name="L48" href="#L48">48</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L49" href="#L49">49</a> <em class="jxr_javadoccomment"> * &lt;p&gt;For example, &lt;code&gt;MessageFormatter.format("Hi {}.", "there");&lt;/code&gt;</em>
<a class="jxr_linenumber" name="L50" href="#L50">50</a> <em class="jxr_javadoccomment"> * will return the string "Hi there.".</em>
<a class="jxr_linenumber" name="L51" href="#L51">51</a> <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="L52" href="#L52">52</a> <em class="jxr_javadoccomment"> * The {} pair is called the formatting element. It serves to designate the</em>
<a class="jxr_linenumber" name="L53" href="#L53">53</a> <em class="jxr_javadoccomment"> * location where the argument needs to be inserted within the pattern.</em>
<a class="jxr_linenumber" name="L54" href="#L54">54</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L55" href="#L55">55</a> <em class="jxr_javadoccomment"> * @param messagePattern</em>
<a class="jxr_linenumber" name="L56" href="#L56">56</a> <em class="jxr_javadoccomment"> * The message pattern which will be parsed and formatted</em>
<a class="jxr_linenumber" name="L57" href="#L57">57</a> <em class="jxr_javadoccomment"> * @param argument</em>
<a class="jxr_linenumber" name="L58" href="#L58">58</a> <em class="jxr_javadoccomment"> * The argument to be inserted instead of the formatting element</em>
<a class="jxr_linenumber" name="L59" href="#L59">59</a> <em class="jxr_javadoccomment"> * @return The formatted message</em>
<a class="jxr_linenumber" name="L60" href="#L60">60</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L61" href="#L61">61</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> String format(<strong class="jxr_keyword">final</strong> String messagePattern,
<a class="jxr_linenumber" name="L62" href="#L62">62</a> <strong class="jxr_keyword">final</strong> Object argument) {
<a class="jxr_linenumber" name="L63" href="#L63">63</a> <strong class="jxr_keyword">int</strong> j = messagePattern.indexOf(DELIM_START);
<a class="jxr_linenumber" name="L64" href="#L64">64</a> <strong class="jxr_keyword">int</strong> len = messagePattern.length();
<a class="jxr_linenumber" name="L65" href="#L65">65</a> <strong class="jxr_keyword">char</strong> escape = 'x';
<a class="jxr_linenumber" name="L66" href="#L66">66</a>
<a class="jxr_linenumber" name="L67" href="#L67">67</a> <em class="jxr_comment">// if there are no { characters or { is the last character</em>
<a class="jxr_linenumber" name="L68" href="#L68">68</a> <em class="jxr_comment">// then we just return messagePattern</em>
<a class="jxr_linenumber" name="L69" href="#L69">69</a> <strong class="jxr_keyword">if</strong> (j == -1 || (j + 1 == len)) {
<a class="jxr_linenumber" name="L70" href="#L70">70</a> <strong class="jxr_keyword">return</strong> messagePattern;
<a class="jxr_linenumber" name="L71" href="#L71">71</a> } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="L72" href="#L72">72</a> <strong class="jxr_keyword">char</strong> delimStop = messagePattern.charAt(j + 1);
<a class="jxr_linenumber" name="L73" href="#L73">73</a> <strong class="jxr_keyword">if</strong> (j &gt; 0) {
<a class="jxr_linenumber" name="L74" href="#L74">74</a> escape = messagePattern.charAt(j - 1);
<a class="jxr_linenumber" name="L75" href="#L75">75</a> }
<a class="jxr_linenumber" name="L76" href="#L76">76</a> <strong class="jxr_keyword">if</strong> ((delimStop != DELIM_STOP) || (escape == '&#92;&#92;')) {
<a class="jxr_linenumber" name="L77" href="#L77">77</a> <em class="jxr_comment">// invalid DELIM_START/DELIM_STOP pair or espace character is</em>
<a class="jxr_linenumber" name="L78" href="#L78">78</a> <em class="jxr_comment">// present</em>
<a class="jxr_linenumber" name="L79" href="#L79">79</a> <strong class="jxr_keyword">return</strong> messagePattern;
<a class="jxr_linenumber" name="L80" href="#L80">80</a> } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="L81" href="#L81">81</a> StringBuffer sbuf = <strong class="jxr_keyword">new</strong> StringBuffer(len + 20);
<a class="jxr_linenumber" name="L82" href="#L82">82</a> sbuf.append(messagePattern.substring(0, j));
<a class="jxr_linenumber" name="L83" href="#L83">83</a> sbuf.append(argument);
<a class="jxr_linenumber" name="L84" href="#L84">84</a> sbuf.append(messagePattern.substring(j + 2));
<a class="jxr_linenumber" name="L85" href="#L85">85</a> <strong class="jxr_keyword">return</strong> sbuf.toString();
<a class="jxr_linenumber" name="L86" href="#L86">86</a> }
<a class="jxr_linenumber" name="L87" href="#L87">87</a> }
<a class="jxr_linenumber" name="L88" href="#L88">88</a> }
<a class="jxr_linenumber" name="L89" href="#L89">89</a>
<a class="jxr_linenumber" name="L90" href="#L90">90</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L91" href="#L91">91</a> <em class="jxr_javadoccomment"> * /**</em>
<a class="jxr_linenumber" name="L92" href="#L92">92</a> <em class="jxr_javadoccomment"> * Performs a two argument substitution for the 'messagePattern' passed as</em>
<a class="jxr_linenumber" name="L93" href="#L93">93</a> <em class="jxr_javadoccomment"> * parameter.</em>
<a class="jxr_linenumber" name="L94" href="#L94">94</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L95" href="#L95">95</a> <em class="jxr_javadoccomment"> * &lt;p&gt;For example, &lt;code&gt;MessageFormatter.format("Hi {}. My name is {}.",</em>
<a class="jxr_linenumber" name="L96" href="#L96">96</a> <em class="jxr_javadoccomment"> * "there", "David");&lt;/code&gt; will return the string</em>
<a class="jxr_linenumber" name="L97" href="#L97">97</a> <em class="jxr_javadoccomment"> * "Hi there. My name is David.".</em>
<a class="jxr_linenumber" name="L98" href="#L98">98</a> <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="L99" href="#L99">99</a> <em class="jxr_javadoccomment"> * The '{}' pair is called a formatting element. It serves to designate the</em>
<a class="jxr_linenumber" name="L100" href="#L100">100</a> <em class="jxr_javadoccomment"> * location where the arguments need to be inserted within</em>
<a class="jxr_linenumber" name="L101" href="#L101">101</a> <em class="jxr_javadoccomment"> * the message pattern.</em>
<a class="jxr_linenumber" name="L102" href="#L102">102</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L103" href="#L103">103</a> <em class="jxr_javadoccomment"> * @param messagePattern</em>
<a class="jxr_linenumber" name="L104" href="#L104">104</a> <em class="jxr_javadoccomment"> * The message pattern which will be parsed and formatted</em>
<a class="jxr_linenumber" name="L105" href="#L105">105</a> <em class="jxr_javadoccomment"> * @param arg1</em>
<a class="jxr_linenumber" name="L106" href="#L106">106</a> <em class="jxr_javadoccomment"> * The first argument to replace the first formatting element</em>
<a class="jxr_linenumber" name="L107" href="#L107">107</a> <em class="jxr_javadoccomment"> * @param arg2</em>
<a class="jxr_linenumber" name="L108" href="#L108">108</a> <em class="jxr_javadoccomment"> * The second argument to replace the second formatting element</em>
<a class="jxr_linenumber" name="L109" href="#L109">109</a> <em class="jxr_javadoccomment"> * @return The formatted message</em>
<a class="jxr_linenumber" name="L110" href="#L110">110</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L111" href="#L111">111</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> String format(<strong class="jxr_keyword">final</strong> String messagePattern,
<a class="jxr_linenumber" name="L112" href="#L112">112</a> <strong class="jxr_keyword">final</strong> Object arg1,
<a class="jxr_linenumber" name="L113" href="#L113">113</a> <strong class="jxr_keyword">final</strong> Object arg2) {
<a class="jxr_linenumber" name="L114" href="#L114">114</a> <strong class="jxr_keyword">int</strong> i = 0;
<a class="jxr_linenumber" name="L115" href="#L115">115</a> <strong class="jxr_keyword">int</strong> len = messagePattern.length();
<a class="jxr_linenumber" name="L116" href="#L116">116</a>
<a class="jxr_linenumber" name="L117" href="#L117">117</a> StringBuffer sbuf = <strong class="jxr_keyword">new</strong> StringBuffer(messagePattern.length() + 50);
<a class="jxr_linenumber" name="L118" href="#L118">118</a>
<a class="jxr_linenumber" name="L119" href="#L119">119</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> l = 0; l &lt; 2; l++) {
<a class="jxr_linenumber" name="L120" href="#L120">120</a> <strong class="jxr_keyword">int</strong> j = messagePattern.indexOf(DELIM_START, i);
<a class="jxr_linenumber" name="L121" href="#L121">121</a>
<a class="jxr_linenumber" name="L122" href="#L122">122</a> <strong class="jxr_keyword">if</strong> (j == -1 || (j + 1 == len)) {
<a class="jxr_linenumber" name="L123" href="#L123">123</a> <em class="jxr_comment">// no more variables</em>
<a class="jxr_linenumber" name="L124" href="#L124">124</a> <strong class="jxr_keyword">if</strong> (i == 0) { <em class="jxr_comment">// this is a simple string</em>
<a class="jxr_linenumber" name="L125" href="#L125">125</a> <strong class="jxr_keyword">return</strong> messagePattern;
<a class="jxr_linenumber" name="L126" href="#L126">126</a> } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="L127" href="#L127">127</a> <em class="jxr_comment">// add the tail string which contains no variables</em>
<a class="jxr_linenumber" name="L128" href="#L128">128</a> <em class="jxr_comment">// and return the result.</em>
<a class="jxr_linenumber" name="L129" href="#L129">129</a> sbuf.append(messagePattern.substring(i,
<a class="jxr_linenumber" name="L130" href="#L130">130</a> messagePattern.length()));
<a class="jxr_linenumber" name="L131" href="#L131">131</a> <strong class="jxr_keyword">return</strong> sbuf.toString();
<a class="jxr_linenumber" name="L132" href="#L132">132</a> }
<a class="jxr_linenumber" name="L133" href="#L133">133</a> } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="L134" href="#L134">134</a> <strong class="jxr_keyword">char</strong> delimStop = messagePattern.charAt(j + 1);
<a class="jxr_linenumber" name="L135" href="#L135">135</a> <strong class="jxr_keyword">if</strong> ((delimStop != DELIM_STOP)) {
<a class="jxr_linenumber" name="L136" href="#L136">136</a> <em class="jxr_comment">// invalid DELIM_START/DELIM_STOP pair</em>
<a class="jxr_linenumber" name="L137" href="#L137">137</a> sbuf.append(messagePattern.substring(i,
<a class="jxr_linenumber" name="L138" href="#L138">138</a> messagePattern.length()));
<a class="jxr_linenumber" name="L139" href="#L139">139</a> <strong class="jxr_keyword">return</strong> sbuf.toString();
<a class="jxr_linenumber" name="L140" href="#L140">140</a> }
<a class="jxr_linenumber" name="L141" href="#L141">141</a> sbuf.append(messagePattern.substring(i, j));
<a class="jxr_linenumber" name="L142" href="#L142">142</a> <strong class="jxr_keyword">if</strong> (l == 0) {
<a class="jxr_linenumber" name="L143" href="#L143">143</a> sbuf.append(arg1);
<a class="jxr_linenumber" name="L144" href="#L144">144</a> } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="L145" href="#L145">145</a> sbuf.append(arg2);
<a class="jxr_linenumber" name="L146" href="#L146">146</a> }
<a class="jxr_linenumber" name="L147" href="#L147">147</a> i = j + 2;
<a class="jxr_linenumber" name="L148" href="#L148">148</a> }
<a class="jxr_linenumber" name="L149" href="#L149">149</a> }
<a class="jxr_linenumber" name="L150" href="#L150">150</a> <em class="jxr_comment">// append the characters following the second {} pair.</em>
<a class="jxr_linenumber" name="L151" href="#L151">151</a> sbuf.append(messagePattern.substring(i, messagePattern.length()));
<a class="jxr_linenumber" name="L152" href="#L152">152</a> <strong class="jxr_keyword">return</strong> sbuf.toString();
<a class="jxr_linenumber" name="L153" href="#L153">153</a> }
<a class="jxr_linenumber" name="L154" href="#L154">154</a> }
</pre>
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