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package org.webmacro.directive; |
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import java.io.IOException; |
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import org.webmacro.Context; |
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import org.webmacro.FastWriter; |
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import org.webmacro.Macro; |
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import org.webmacro.PropertyException; |
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import org.webmacro.TemplateVisitor; |
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import org.webmacro.engine.BuildContext; |
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import org.webmacro.engine.BuildException; |
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import org.webmacro.engine.Variable; |
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public class DefaultDirective extends Directive |
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{ |
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private static final int DEFAULT_TARGET = 1; |
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private static final int DEFAULT_RESULT = 3; |
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private Variable target; |
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private Object result; |
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private static final ArgDescriptor[] |
52 | 2 | myArgs = new ArgDescriptor[]{ |
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new LValueArg(DEFAULT_TARGET), |
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new OptionalGroup(2), |
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new AssignmentArg(), |
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new RValueArg(DEFAULT_RESULT) |
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}; |
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private static final DirectiveDescriptor |
61 | 2 | myDescr = new DirectiveDescriptor("default", null, myArgs, null); |
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public static DirectiveDescriptor getDescriptor () |
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{ |
65 | 6 | return myDescr; |
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} |
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public DefaultDirective () |
69 | 0 | { |
70 | 0 | } |
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public Object build (DirectiveBuilder builder, |
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BuildContext bc) |
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throws BuildException |
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{ |
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try |
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{ |
78 | 0 | target = (Variable) builder.getArg(DEFAULT_TARGET, bc); |
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} |
80 | 0 | catch (ClassCastException e) |
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{ |
82 | 0 | throw new NotVariableBuildException(myDescr.name, e); |
83 | 0 | } |
84 | 0 | if (!target.isSimpleName()) |
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{ |
86 | 0 | throw new NotSimpleVariableBuildException(myDescr.name); |
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} |
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|
89 | 0 | result = builder.getArg(DEFAULT_RESULT, bc); |
90 | 0 | if (result == null) result = ""; |
91 | 0 | return this; |
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} |
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public void write (FastWriter out, Context context) |
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throws PropertyException, IOException |
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{ |
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try |
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{ |
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|
101 | 0 | if (context.containsKey(target.getName())) return; |
102 | 0 | if (result instanceof Macro) |
103 | 0 | target.setValue(context, ((Macro) result).evaluate(context)); |
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else |
105 | 0 | target.setValue(context, result); |
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} |
107 | 0 | catch (PropertyException e) |
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{ |
109 | 0 | throw e; |
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} |
111 | 0 | catch (Exception e) |
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{ |
113 | 0 | String errorText = "#default: Unable to set default value for " + target; |
114 | 0 | writeWarning(errorText, context, out); |
115 | 0 | } |
116 | 0 | } |
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public void accept (TemplateVisitor v) |
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{ |
120 | 0 | v.beginDirective(myDescr.name); |
121 | 0 | v.visitDirectiveArg("DefaultTarget", target); |
122 | 0 | v.visitDirectiveArg("DefaultValue", result); |
123 | 0 | v.endDirective(); |
124 | 0 | } |
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} |