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| <h1 class="content-header header-section1" id="versions_2_0RC2" itemprop="headline">2.0 RC2</h1> |
| </div></div><div class="page-menu"> |
| <div class="page-menu-title">Page Contents</div> |
| <ul><li><a class="page-menu-link" href="#autoid_236" data-menu-target="autoid_236">Changes to Template Language</a></li><li><a class="page-menu-link" href="#autoid_237" data-menu-target="autoid_237">API Changes</a></li></ul> </div><p>FreeMarker 2.0 RC 2 was released on 4 April 2002. Here is a |
| summary of changes wrt to the first release.</p> |
| |
| |
| |
| |
| <h2 class="content-header header-section2" id="autoid_236">Changes to Template Language</h2> |
| |
| |
| <ul> |
| <li> |
| <p>Certain built-in functionality is provided via a new |
| operator, '?'. Thus, <code class="inline-code">myList?size</code> provides the |
| number of elements in a list. Similarly, |
| <code class="inline-code">myString?length</code> provides the length of a |
| string, <code class="inline-code">myString?upper_case</code> puts the string |
| all in capital letters, and <code class="inline-code">myHash?keys</code> |
| provides a sequence containing the keys in the hash. See <a href="ref_builtins.html">Reference/Built-in Reference</a> for list of all available |
| built-ins.</p> |
| </li> |
| |
| <li> |
| <p>Numerical comparisons can now be made using the "natural" |
| operators < and > but there are also "web-safe" |
| alternatives, such as <em>\lt</em> and |
| <em>\gt</em>, since the use of these characters may |
| confuse HTML editors and parsers. Note that these changed |
| between rc1 and rc2, they now start with a backslash. A little |
| asymmetry is the fact that if you use the natural greater-than |
| or greater-than-or-equals operators (i.e. > or >=) the |
| expression must be in parentheses. With any other operator, the |
| parentheses are optional.</p> |
| </li> |
| |
| <li> |
| <p>Within an iteration loop -- i.e. a |
| <code class="inline-code">foreach</code> or a <code class="inline-code">list</code> block -- |
| the current count in the loop is available as the special |
| variable |
| <code class="inline-code"><em class="code-color">index</em>_count</code>. where |
| <em>index</em> is the name of the variable in |
| the iteration. A boolean variable called |
| <code class="inline-code"><em class="code-color">index</em>_has_next</code> is |
| also defined that indicates whether there are any more items in |
| the iteration after this one. Note that the index starts at |
| zero, so you will often be adding one to it in practice.</p> |
| </li> |
| |
| <li> |
| <p>The <code class="inline-code"><#break></code> directive can now be |
| used to break out of a <code class="inline-code"><#foreach...></code> or |
| a <code class="inline-code"><list...></code> loop. (Prior to this |
| version, it only worked within a switch-case block.) There is a |
| new directive called <code class="inline-code"><#stop></code> that, when |
| encountered, simply halts processing of the template. This can |
| be useful for debugging purposes.</p> |
| </li> |
| |
| <li> |
| <p>When invoking java methods that have been exposed to the |
| page, using the code in freemarker.ext.*, there are built-ins |
| that allow you to indicate the numerical type that you wish to |
| pass as the value. For instance, if you had two methods, one |
| that takes an int and another that takes a long, and you wanted |
| to pass in a value, you would have to specify which method. |
| <code class="inline-code">myMethod(1?int)</code> or |
| <code class="inline-code">myMethod(1?long)</code>. This is unnecessary if |
| there is only one method of the given name.</p> |
| </li> |
| |
| <li> |
| <p>Ranges can be used to get the sublist from a list or the |
| substring of a string. For example: |
| <code class="inline-code">myList[0..3]</code> will return items 0 through 3 of |
| the list in question. Or, for example, you could get all the |
| elements of the list except for the first and last ones via: |
| <code class="inline-code">myList[1..(myList?size-2)]</code></p> |
| </li> |
| |
| <li> |
| <p>Or we could get the first 6 characters of a string via |
| <code class="inline-code">myString[0..5]</code></p> |
| </li> |
| |
| <li> |
| <p>Lists can be concatenated using the '+' operator. |
| Previously, this overloading of '+' only applied to |
| strings.</p> |
| </li> |
| |
| <li> |
| <p>An attempt to compare a number to a string now throws an |
| exception, since it is indicative of a coding error. Note that |
| there is a backward compatibility mode that can be set (see |
| below) that loosens this up in order to be able to process |
| legacy templates.</p> |
| </li> |
| </ul> |
| |
| |
| |
| |
| |
| <h2 class="content-header header-section2" id="autoid_237">API Changes</h2> |
| |
| |
| <ul> |
| <li> |
| <p>The <code class="inline-code">TemplateSequenceModel</code> interface now |
| has a <code class="inline-code">size()</code> method for getting the number of |
| elements in the sequence in question.</p> |
| </li> |
| |
| <li> |
| <p>The <code class="inline-code">TemplateModelIterator</code> interface now |
| has a <code class="inline-code">hasNext()</code> method.</p> |
| </li> |
| |
| <li> |
| <p>The default sequence and hash implementations, |
| <code class="inline-code">freemarker.template.SimpleSequence</code> and |
| <code class="inline-code">freemarker.template.SimpleHash</code> are now |
| unsynchronized. If you need the methods to be synchronized, you |
| can get a synchronized wrapper via the |
| <code class="inline-code">synchronizedWrapper()</code> in either class.</p> |
| </li> |
| |
| <li> |
| <p>The <code class="inline-code">freemarker.utility.ExtendedList</code> and |
| <code class="inline-code">freemarker.utility.ExtendedHash</code> classes were |
| removed, since all of the extra keys that it defined are now |
| available using the appropriate '?' built-in operation, i.e. |
| <code class="inline-code">myHash?keys</code> or <code class="inline-code">myList?size</code> |
| or <code class="inline-code">myList?last</code>.</p> |
| </li> |
| |
| <li> |
| <p>There is a method in |
| <code class="inline-code">java.freemarker.Configuration</code> named |
| <code class="inline-code">setDebugMode()</code> which allows you to decide |
| whether stack traces are simply output to the web client (the |
| best situation in development) or thrown back to the caller to |
| be handled more gracefully (the best situation in |
| production).</p> |
| </li> |
| |
| <li> |
| <p>There is a flag that can be set to turn on a processing |
| mode that is more backward-compatible with FreeMarker Classic. |
| This is off by default, but you can set it via |
| <code class="inline-code">Template.setClassicCompatibility(true)</code>. What |
| this does is that it allows scalars to be treated as a |
| single-item list in a list directive. Also, it allows somewhat |
| more looseness about types. In FreeMarker 1.x, <code class="inline-code"><#if |
| x=="1"></code> and <code class="inline-code"><#if x==1></code> |
| were in fact equivalent. This meant that legacy templates might |
| tend to be slack about this. If classic compatibility is not |
| set, an attempt to compare the string "1" with the number 1 will |
| result in an exception being thrown. (Note that it is preferable |
| to get your templates working without the backward compatibility |
| flag, since it usually will require only minor changes. However, |
| for people with a lot of templates and no time to check over |
| them, this flag may be of use.)</p> |
| </li> |
| </ul> |
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