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| org.apache.commons.jelly.impl.DynamicDynaBeanTag |
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| 1 | /* |
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| 2 | * Copyright 2002,2004 The Apache Software Foundation. |
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| 3 | * |
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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| 5 | * you may not use this file except in compliance with the License. |
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| 6 | * You may obtain a copy of the License at |
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| 7 | * |
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 9 | * |
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| 10 | * Unless required by applicable law or agreed to in writing, software |
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 13 | * See the License for the specific language governing permissions and |
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| 14 | * limitations under the License. |
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| 15 | */ |
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| 16 | package org.apache.commons.jelly.impl; |
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| 17 | ||
| 18 | import java.util.HashSet; |
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| 19 | import java.util.Iterator; |
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| 20 | import java.util.Map; |
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| 21 | import java.util.Set; |
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| 22 | ||
| 23 | import org.apache.commons.beanutils.DynaClass; |
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| 24 | import org.apache.commons.jelly.DynaBeanTagSupport; |
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| 25 | import org.apache.commons.jelly.JellyTagException; |
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| 26 | import org.apache.commons.jelly.MissingAttributeException; |
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| 27 | import org.apache.commons.jelly.XMLOutput; |
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| 28 | import org.apache.commons.jelly.expression.Expression; |
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| 29 | ||
| 30 | /** |
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| 31 | * This tag is bound onto a {@link DynaClass} instance. |
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| 32 | * When the tag is invoked a {@link DynaBean will be created using the tags attributes. |
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| 33 | * So this class is like a {@link DynaBean} implemenation of {@link DynamicBeanTag} |
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| 34 | * |
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| 35 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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| 36 | * @version $Revision: 155420 $ |
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| 37 | */ |
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| 38 | public class DynamicDynaBeanTag extends DynaBeanTagSupport implements BeanSource { |
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| 39 | ||
| 40 | /** the bean class */ |
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| 41 | private DynaClass beanClass; |
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| 42 | ||
| 43 | /** |
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| 44 | * the tag attribute name that is used to declare the name |
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| 45 | * of the variable to export after running this tag |
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| 46 | */ |
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| 47 | private String variableNameAttribute; |
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| 48 | ||
| 49 | /** the current variable name that the bean should be exported as */ |
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| 50 | private String var; |
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| 51 | ||
| 52 | /** the set of attribute names we've already set */ |
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| 53 | 0 | private Set setAttributesSet = new HashSet(); |
| 54 | ||
| 55 | /** the attribute definitions */ |
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| 56 | private Map attributes; |
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| 57 | ||
| 58 | 0 | public DynamicDynaBeanTag(DynaClass beanClass, Map attributes, String variableNameAttribute) { |
| 59 | 0 | this.beanClass = beanClass; |
| 60 | 0 | this.attributes = attributes; |
| 61 | 0 | this.variableNameAttribute = variableNameAttribute; |
| 62 | 0 | } |
| 63 | ||
| 64 | public void beforeSetAttributes() throws JellyTagException { |
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| 65 | // create a new dynabean before the attributes are set |
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| 66 | try { |
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| 67 | 0 | setDynaBean( beanClass.newInstance() ); |
| 68 | 0 | } catch (IllegalAccessException e) { |
| 69 | 0 | throw new JellyTagException("Could not instantiate dynabean",e); |
| 70 | 0 | } catch (InstantiationException e) { |
| 71 | 0 | throw new JellyTagException("Could not instantiate dynabean",e); |
| 72 | 0 | } |
| 73 | ||
| 74 | 0 | setAttributesSet.clear(); |
| 75 | 0 | } |
| 76 | ||
| 77 | public void setAttribute(String name, Object value) throws JellyTagException { |
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| 78 | 0 | boolean isVariableName = false; |
| 79 | 0 | if (variableNameAttribute != null ) { |
| 80 | 0 | if ( variableNameAttribute.equals( name ) ) { |
| 81 | 0 | if (value == null) { |
| 82 | 0 | var = null; |
| 83 | 0 | } |
| 84 | else { |
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| 85 | 0 | var = value.toString(); |
| 86 | } |
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| 87 | 0 | isVariableName = true; |
| 88 | } |
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| 89 | } |
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| 90 | 0 | if (! isVariableName) { |
| 91 | ||
| 92 | // #### strictly speaking we could |
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| 93 | // know what attributes are specified at compile time |
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| 94 | // so this dynamic set is unnecessary |
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| 95 | 0 | setAttributesSet.add(name); |
| 96 | ||
| 97 | // we could maybe implement attribute specific validation here |
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| 98 | ||
| 99 | 0 | super.setAttribute(name, value); |
| 100 | } |
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| 101 | 0 | } |
| 102 | ||
| 103 | // Tag interface |
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| 104 | //------------------------------------------------------------------------- |
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| 105 | public void doTag(XMLOutput output) throws JellyTagException { |
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| 106 | ||
| 107 | // lets find any attributes that are not set and |
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| 108 | 0 | for ( Iterator iter = attributes.values().iterator(); iter.hasNext(); ) { |
| 109 | 0 | Attribute attribute = (Attribute) iter.next(); |
| 110 | 0 | String name = attribute.getName(); |
| 111 | 0 | if ( ! setAttributesSet.contains( name ) ) { |
| 112 | 0 | if ( attribute.isRequired() ) { |
| 113 | 0 | throw new MissingAttributeException(name); |
| 114 | } |
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| 115 | // lets get the default value |
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| 116 | 0 | Object value = null; |
| 117 | 0 | Expression expression = attribute.getDefaultValue(); |
| 118 | 0 | if ( expression != null ) { |
| 119 | 0 | value = expression.evaluate(context); |
| 120 | } |
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| 121 | ||
| 122 | // only set non-null values? |
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| 123 | 0 | if ( value != null ) { |
| 124 | 0 | super.setAttribute(name, value); |
| 125 | } |
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| 126 | } |
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| 127 | 0 | } |
| 128 | ||
| 129 | 0 | invokeBody(output); |
| 130 | ||
| 131 | // export the bean if required |
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| 132 | 0 | if ( var != null ) { |
| 133 | 0 | context.setVariable(var, getDynaBean()); |
| 134 | } |
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| 135 | 0 | } |
| 136 | ||
| 137 | // Properties |
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| 138 | //------------------------------------------------------------------------- |
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| 139 | /** |
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| 140 | * @return the bean that has just been created |
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| 141 | */ |
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| 142 | public Object getBean() { |
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| 143 | 0 | return getDynaBean(); |
| 144 | } |
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| 145 | } |
| This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |