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package org.apache.commons.jelly.expression; |
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import java.util.Collections; |
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import java.util.Collection; |
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import java.util.Enumeration; |
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import java.util.Iterator; |
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import java.util.List; |
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import java.util.Map; |
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import org.apache.commons.collections.iterators.ArrayIterator; |
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import org.apache.commons.collections.iterators.EnumerationIterator; |
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import org.apache.commons.collections.iterators.SingletonIterator; |
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import org.apache.commons.jelly.JellyContext; |
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import org.apache.commons.lang.StringUtils; |
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63258 |
public abstract class ExpressionSupport implements Expression { |
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protected static final Iterator EMPTY_ITERATOR = Collections.EMPTY_LIST.iterator(); |
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public String evaluateAsString(JellyContext context) { |
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3055 |
Object value = evaluateRecurse(context); |
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if ( value != null ) { |
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return value.toString(); |
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} |
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return null; |
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} |
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public Object evaluateRecurse(JellyContext context) { |
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15197 |
Object value = evaluate(context); |
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15197 |
if (value instanceof Expression) { |
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Expression expression = (Expression) value; |
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return expression.evaluateRecurse(context); |
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} |
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15197 |
return value; |
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} |
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public boolean evaluateAsBoolean(JellyContext context) { |
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Object value = evaluateRecurse(context); |
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if ( value instanceof Boolean ) { |
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Boolean b = (Boolean) value; |
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return b.booleanValue(); |
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} |
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2093 |
else if ( value instanceof String ) { |
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String str = (String) value; |
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return ( str.equalsIgnoreCase( "on" ) |
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|| |
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str.equalsIgnoreCase( "yes" ) |
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str.equals( "1" ) |
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str.equalsIgnoreCase( "true" ) ); |
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} |
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return false; |
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} |
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public Iterator evaluateAsIterator(JellyContext context) { |
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Object value = evaluateRecurse(context); |
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if ( value == null ) { |
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return EMPTY_ITERATOR; |
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} else if ( value instanceof Iterator ) { |
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return (Iterator) value; |
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} else if ( value instanceof List ) { |
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List list = (List) value; |
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return list.iterator(); |
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} else if ( value instanceof Map ) { |
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Map map = (Map) value; |
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return map.entrySet().iterator(); |
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} else if ( value.getClass().isArray() ) { |
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return new ArrayIterator( value ); |
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} else if ( value instanceof Enumeration ) { |
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return new EnumerationIterator((Enumeration ) value); |
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} else if ( value instanceof Collection ) { |
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Collection collection = (Collection) value; |
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return collection.iterator(); |
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} else if ( value instanceof String ) { |
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String[] array = StringUtils.split((String) value, "," ); |
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array = StringUtils.stripAll( array ); |
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return new ArrayIterator( array ); |
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} else { |
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return new SingletonIterator( value ); |
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} |
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} |
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} |