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java.lang.Objectorg.apache.commons.lang.text.StrLookup
org.apache.commons.configuration.interpol.ExprLookup
public class ExprLookup
Lookup that allows expressions to be evaluated.
ExprLookup.Variables vars = new ExprLookup.Variables(); vars.add(new ExprLookup.Variable("String", org.apache.commons.lang.StringUtils.class)); vars.add(new ExprLookup.Variable("Util", new Utility("Hello"))); vars.add(new ExprLookup.Variable("System", "Class:java.lang.System")); XMLConfiguration config = new XMLConfiguration(TEST_FILE); config.setLogger(log); ExprLookup lookup = new ExprLookup(vars); lookup.setConfiguration(config); String str = lookup.lookup("'$[element] ' + String.trimToEmpty('$[space.description]')");In the example above TEST_FILE contains xml that looks like:
<configuration> <element>value</element> <space xml:space="preserve"> <description xml:space="default"> Some text </description> </space> </configuration>The result will be "value Some text". This lookup uses Apache Commons Jexl and requires that the dependency be added to any projects which use this.
Nested Class Summary | |
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static class |
ExprLookup.Variable
The key and corresponding object that will be made available to the JexlContext for use in expressions. |
static class |
ExprLookup.Variables
List wrapper used to allow the Variables list to be created as beans in DefaultConfigurationBuilder. |
Constructor Summary | |
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ExprLookup()
The default constructor. |
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ExprLookup(ExprLookup.Variables list)
Constructor for use by applications. |
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ExprLookup(ExprLookup.Variables list,
java.lang.String prefix,
java.lang.String suffix)
Constructor for use by applications. |
Method Summary | |
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ExprLookup.Variables |
getVariables()
Returns the list of Variables that are accessible within expressions. |
java.lang.String |
lookup(java.lang.String var)
Evaluates the expression. |
void |
setConfiguration(AbstractConfiguration config)
Set the configuration to be used to interpolate subordinate expressions. |
void |
setVariablePrefixMatcher(java.lang.String prefix)
Set the prefix to use to identify subordinate expressions. |
void |
setVariables(ExprLookup.Variables list)
Add the Variables that will be accessible within expressions. |
void |
setVariableSuffixMatcher(java.lang.String suffix)
Set the suffix to use to identify subordinate expressions. |
Methods inherited from class org.apache.commons.lang.text.StrLookup |
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mapLookup, noneLookup, systemPropertiesLookup |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public ExprLookup()
public ExprLookup(ExprLookup.Variables list)
list
- The list of objects to be accessible in expressions.public ExprLookup(ExprLookup.Variables list, java.lang.String prefix, java.lang.String suffix)
list
- The list of objects to be accessible in expressions.prefix
- The prefix to use for subordinate lookups.suffix
- The suffix to use for subordinate lookups.Method Detail |
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public void setVariablePrefixMatcher(java.lang.String prefix)
prefix
- The String identifying the beginning of the expression.public void setVariableSuffixMatcher(java.lang.String suffix)
suffix
- The String identifying the end of the expression.public void setVariables(ExprLookup.Variables list)
list
- The list of Variables.public ExprLookup.Variables getVariables()
public void setConfiguration(AbstractConfiguration config)
config
- The Configuration.public java.lang.String lookup(java.lang.String var)
lookup
in class org.apache.commons.lang.text.StrLookup
var
- The expression.
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