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package org.webmacro.directive; |
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import java.io.IOException; |
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import java.util.ArrayList; |
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import java.util.Iterator; |
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import java.util.List; |
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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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86 | 0 | public class AlternateDirective extends Directive |
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{ |
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private static final int ALTERNATE_TARGET = 1; |
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private static final int ALTERNATE_THROUGH = 2; |
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private static final int ALTERNATE_LIST = 3; |
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private Variable target; |
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private Object list; |
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private static final ArgDescriptor[] |
94 | 2 | myArgs = new ArgDescriptor[] { |
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new LValueArg(ALTERNATE_TARGET), |
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new KeywordArg(ALTERNATE_THROUGH, "through"), |
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new RValueArg(ALTERNATE_LIST) |
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}; |
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private static final DirectiveDescriptor |
100 | 2 | myDescr = new DirectiveDescriptor("alternate", null, myArgs, null); |
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public static DirectiveDescriptor getDescriptor() |
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{ |
103 | 6 | return myDescr; |
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} |
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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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{ |
111 | 0 | target = (Variable) builder.getArg(ALTERNATE_TARGET, bc); |
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} |
113 | 0 | catch (ClassCastException e) |
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{ |
115 | 0 | throw new NotVariableBuildException(myDescr.name, e); |
116 | 0 | } |
117 | 0 | list = builder.getArg(ALTERNATE_LIST, bc); |
118 | 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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{ |
123 | 0 | Object l = null; |
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try |
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{ |
126 | 0 | if (list instanceof Macro) |
127 | 0 | l = ((Macro) list).evaluate(context); |
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else |
129 | 0 | l = list; |
130 | 0 | Iterator itr = context.getBroker()._propertyOperators |
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.getIterator(l); |
132 | 0 | target.setValue(context, new IteratorAlternator(itr)); |
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} |
134 | 0 | catch (Exception e) |
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{ |
136 | 0 | String warning = "#alternate: list argument is not a list: " + l; |
137 | 0 | writeWarning(warning, context, out); |
138 | 0 | return; |
139 | 0 | } |
140 | 0 | } |
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public void accept(TemplateVisitor v) |
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{ |
143 | 0 | v.beginDirective(myDescr.name); |
144 | 0 | v.visitDirectiveArg("AlternateTarget", target); |
145 | 0 | v.visitDirectiveArg("AlternateList", list); |
146 | 0 | v.endDirective(); |
147 | 0 | } |
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} |
149 | 0 | abstract class Alternator implements Macro |
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{ |
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public abstract Object evaluate(Context context); |
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public void write(FastWriter out, Context context) |
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throws PropertyException, IOException |
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{ |
155 | 0 | Object o = evaluate(context); |
156 | 0 | if (o != null) |
157 | 0 | out.write(o.toString()); |
158 | 0 | } |
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} |
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class IteratorAlternator extends Alternator |
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{ |
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private Iterator<Object> itr; |
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private List<Object> list; |
164 | 0 | private int index = -1; |
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public IteratorAlternator(Iterator<Object> itr) |
166 | 0 | { |
167 | 0 | this.itr = itr; |
168 | 0 | this.list = new ArrayList<Object>(); |
169 | 0 | } |
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public Object evaluate(Context context) |
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{ |
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Object o; |
173 | 0 | if (index == -1 && itr.hasNext()) |
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{ |
175 | 0 | o = itr.next(); |
176 | 0 | list.add(o); |
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} |
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else |
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{ |
180 | 0 | index++; |
181 | 0 | if (index == list.size()) |
182 | 0 | index = 0; |
183 | 0 | o = list.get(index); |
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} |
185 | 0 | return o; |
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} |
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} |