Class EnvarBasedValueSource
- java.lang.Object
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- org.codehaus.plexus.interpolation.fixed.EnvarBasedValueSource
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- All Implemented Interfaces:
FixedValueSource
public class EnvarBasedValueSource extends Object implements FixedValueSource
ValueSource
which resolves expressions against the environment variables available from the underlying operating system (and possibly, the shell environment that created the present Java process). If the expression starts with 'env.', this prefix is trimmed before resolving the rest as an environment variable name.
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Constructor Summary
Constructors Constructor Description EnvarBasedValueSource()
Create a new value source for interpolation based on shell environment variables.EnvarBasedValueSource(boolean caseSensitive)
Create a new value source for interpolation based on shell environment variables.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Object
getValue(String expression, InterpolationState interpolationState)
If the expression starts with 'env.' then trim this prefix.
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Constructor Detail
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EnvarBasedValueSource
public EnvarBasedValueSource() throws IOException
Create a new value source for interpolation based on shell environment variables. In this case, envar keys ARE CASE SENSITIVE.- Throws:
IOException
- in case of an error.
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EnvarBasedValueSource
public EnvarBasedValueSource(boolean caseSensitive) throws IOException
Create a new value source for interpolation based on shell environment variables.- Parameters:
caseSensitive
- Whether the environment variable key should be treated in a case-sensitive manner for lookups- Throws:
IOException
- in case of an error.
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Method Detail
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getValue
public Object getValue(String expression, InterpolationState interpolationState)
If the expression starts with 'env.' then trim this prefix. Next, resolve the (possibly trimmed) expression as an environment variable name against the collection of environment variables that were read from the operating system when thisValueSource
instance was created.- Specified by:
getValue
in interfaceFixedValueSource
- Parameters:
expression
- envar expression, like 'HOME' or 'env.HOME'interpolationState
-InterpolationState
.- Returns:
- the environment variable value for the given expression
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