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package org.apache.commons.jelly.expression.jexl; |
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import java.util.Map; |
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import java.util.Set; |
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import java.util.Collection; |
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import org.apache.commons.jelly.JellyContext; |
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import org.apache.commons.jelly.expression.ExpressionSupport; |
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import org.apache.commons.jexl.Expression; |
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import org.apache.commons.jexl.JexlContext; |
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import org.apache.commons.logging.Log; |
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import org.apache.commons.logging.LogFactory; |
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public class JexlExpression extends ExpressionSupport { |
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private static final Log log = LogFactory.getLog(JexlExpression.class); |
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private Expression expression; |
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public JexlExpression(Expression expression) { |
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this.expression = expression; |
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} |
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public String toString() { |
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return super.toString() + "[" + expression.getExpression() + "]"; |
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} |
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public String getExpressionText() { |
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return "${" + expression.getExpression() + "}"; |
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} |
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public Object evaluate(JellyContext context) { |
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try { |
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JexlContext jexlContext = new JellyJexlContext( context ); |
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if (log.isDebugEnabled()) { |
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log.debug("Evaluating EL: " + expression.getExpression()); |
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} |
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Object value = expression.evaluate(jexlContext); |
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if (log.isDebugEnabled()) { |
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log.debug("value of expression: " + value); |
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} |
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return value; |
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} |
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catch (Exception e) { |
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log.warn("Caught exception evaluating: " + expression + ". Reason: " + e, e); |
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return null; |
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} |
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} |
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} |
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class JellyJexlContext implements JexlContext { |
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private Map vars; |
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JellyJexlContext(JellyContext context) { |
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this.vars = new JellyMap( context ); |
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} |
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public void setVars(Map vars) { |
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this.vars.clear(); |
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this.vars.putAll( vars ); |
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} |
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public Map getVars() { |
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return this.vars; |
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} |
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} |
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class JellyMap implements Map { |
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private JellyContext context; |
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JellyMap(JellyContext context) { |
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this.context = context; |
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} |
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public Object get(Object key) { |
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return context.getVariable( (String) key ); |
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} |
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public void clear() { |
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} |
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public boolean containsKey(Object key) { |
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return ( get( key ) != null ); |
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} |
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public boolean containsValue(Object value) { |
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return false; |
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} |
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public Set entrySet() { |
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return null; |
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} |
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public boolean isEmpty() { |
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return false; |
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} |
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public Set keySet() { |
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return null; |
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} |
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public Object put(Object key, Object value) { |
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return null; |
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} |
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public void putAll(Map t) { |
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} |
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public Object remove(Object key) { |
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return null; |
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} |
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public int size() { |
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return -1; |
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} |
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public Collection values() { |
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return null; |
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} |
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} |