| /* |
| * Copyright 2002,2004 The Apache Software Foundation. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.jelly.tags.dynabean; |
| |
| import java.util.Map; |
| |
| import org.apache.commons.beanutils.BeanUtils; |
| import org.apache.commons.jelly.JellyTagException; |
| import org.apache.commons.jelly.TagSupport; |
| import org.apache.commons.jelly.XMLOutput; |
| import org.apache.commons.jelly.expression.Expression; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| /** A tag which sets a variable from the result of an expression |
| * |
| * @author Theo Niemeijer |
| * @version 1.0 |
| */ |
| public class SetTag extends TagSupport { |
| |
| /** The Log to which logging calls will be made. */ |
| private static final Log log = LogFactory.getLog(SetTag.class); |
| |
| /** The variable name to export. */ |
| private String var; |
| |
| /** The variable scope to export */ |
| private String scope; |
| |
| /** The expression to evaluate. */ |
| private Expression value; |
| |
| /** The target object on which to set a property. */ |
| private Object target; |
| |
| /** The name of the property to set on the target object. */ |
| private String property; |
| |
| public SetTag() { |
| } |
| |
| // Tag interface |
| //------------------------------------------------------------------------- |
| public void doTag(XMLOutput output) throws JellyTagException { |
| Object answer = null; |
| if ( value != null ) { |
| answer = value.evaluate(context); |
| } |
| else { |
| answer = getBodyText(); |
| } |
| |
| // Assume that if a var name and a property is given then |
| // var is the name of an object in the context |
| if (( var != null ) |
| && ( property != null) |
| && ( target == null )) |
| { |
| // Get object from context |
| if ( scope != null ) { |
| target = context.getVariable(var, scope); |
| } |
| else { |
| target = context.getVariable(var); |
| } |
| |
| if (target != null) { |
| var = null; |
| } |
| } |
| |
| if ( var != null ) { |
| |
| |
| if ( scope != null ) { |
| context.setVariable(var, scope, answer); |
| } |
| else { |
| context.setVariable(var, answer); |
| } |
| } |
| else { |
| if ( target == null ) { |
| throw new JellyTagException( "Either a 'var' or a 'target' attribute must be defined for this tag" ); |
| } |
| if ( property == null ) { |
| throw new JellyTagException( "You must define a 'property' attribute if you specify a 'target'" ); |
| } |
| setPropertyValue( target, property, answer ); |
| } |
| } |
| |
| // Properties |
| //------------------------------------------------------------------------- |
| /** Sets the variable name to define for this expression |
| */ |
| public void setVar(String var) { |
| this.var = var; |
| } |
| |
| /** |
| * Sets the variable scope for this variable. For example setting this value to 'parent' will |
| * set this value in the parent scope. When Jelly is run from inside a Servlet environment |
| * then other scopes will be available such as 'request', 'session' or 'application'. |
| * |
| * Other applications may implement their own custom scopes. |
| */ |
| public void setScope(String scope) { |
| this.scope = scope; |
| } |
| |
| /** Sets the expression to evaluate. */ |
| public void setValue(Expression value) { |
| this.value = value; |
| } |
| |
| /** Sets the target object on which to set a property. */ |
| public void setTarget(Object target) { |
| this.target = target; |
| } |
| |
| /** Sets the name of the property to set on the target object. */ |
| public void setProperty(String property) { |
| this.property = property; |
| } |
| |
| // Implementation methods |
| //------------------------------------------------------------------------- |
| protected void setPropertyValue( Object target, String property, Object value ) { |
| try { |
| if ( target instanceof Map ) { |
| Map map = (Map) target; |
| map.put( property, value ); |
| } |
| else { |
| BeanUtils.setProperty( target, property, value ); |
| } |
| } |
| catch (Exception e) { |
| log.error( "Failed to set the property: " + property + " on bean: " + target + " to value: " + value + " due to exception: " + e, e ); |
| } |
| } |
| |
| } |