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package org.apache.commons.jelly.tags.core; |
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import java.lang.reflect.InvocationTargetException; |
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import java.util.ArrayList; |
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import java.util.List; |
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import org.apache.commons.beanutils.MethodUtils; |
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import org.apache.commons.jelly.JellyTagException; |
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import org.apache.commons.jelly.MissingAttributeException; |
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import org.apache.commons.jelly.TagSupport; |
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import org.apache.commons.jelly.XMLOutput; |
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public class InvokeTag extends TagSupport implements ArgTagParent { |
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private String var; |
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private String exceptionVar; |
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private String methodName; |
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private Object onInstance; |
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private List paramTypes = new ArrayList(); |
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private List paramValues = new ArrayList(); |
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public InvokeTag() { |
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} |
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public void setVar(String var) { |
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this.var = class="keyword">var; |
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} |
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public void setExceptionVar(String var) { |
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this.exceptionVar = var; |
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} |
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public void setMethod(String method) { |
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this.methodName = method; |
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} |
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public void setOn(Object instance) { |
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this.onInstance = instance; |
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} |
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public void addArgument(Class type, Object value) { |
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paramTypes.add(type); |
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paramValues.add(value); |
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} |
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public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException { |
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if ( null == methodName) { |
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throw new MissingAttributeException( "method" ); |
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} |
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if ( null == onInstance ) { |
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throw new MissingAttributeException( "on" ); |
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} |
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invokeBody(output); |
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Object[] values = paramValues.toArray(); |
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Class[] types = (Class[])(paramTypes.toArray(new Class[paramTypes.size()])); |
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Object result = null; |
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try { |
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result = MethodUtils.invokeMethod(onInstance,methodName,values,types); |
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} |
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catch (NoSuchMethodException e) { |
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throw new JellyTagException(e); |
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} |
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catch (IllegalAccessException e) { |
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throw new JellyTagException(e); |
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} |
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catch (InvocationTargetException e) { |
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if(null != exceptionVar) { |
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context.setVariable(exceptionVar,e.getTargetException()); |
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} else { |
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throw new JellyTagException("method " + methodName + |
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" threw exception: "+ e.getTargetException().getMessage(), |
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e.getTargetException() ); |
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} |
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} |
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finally { |
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paramTypes.clear(); |
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paramValues.clear(); |
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} |
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ArgTag parentArg = (ArgTag)(findAncestorWithClass(ArgTag.class)); |
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if(null != parentArg) { |
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parentArg.setValue(result); |
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} |
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if(null != var) { |
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context.setVariable(var, result); |
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} |
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} |
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} |