001    package org.apache.myfaces.tobago.taglib.component;
002    
003    /*
004     * Licensed to the Apache Software Foundation (ASF) under one or more
005     * contributor license agreements.  See the NOTICE file distributed with
006     * this work for additional information regarding copyright ownership.
007     * The ASF licenses this file to You under the Apache License, Version 2.0
008     * (the "License"); you may not use this file except in compliance with
009     * the License.  You may obtain a copy of the License at
010     *
011     *      http://www.apache.org/licenses/LICENSE-2.0
012     *
013     * Unless required by applicable law or agreed to in writing, software
014     * distributed under the License is distributed on an "AS IS" BASIS,
015     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016     * See the License for the specific language governing permissions and
017     * limitations under the License.
018     */
019    
020    import org.apache.myfaces.tobago.apt.annotation.Tag;
021    import org.apache.myfaces.tobago.apt.annotation.BodyContent;
022    import org.apache.myfaces.tobago.apt.annotation.TagAttribute;
023    import org.apache.myfaces.tobago.component.ComponentUtil;
024    import org.apache.myfaces.tobago.component.UICommand;
025    import org.apache.myfaces.tobago.TobagoConstants;
026    
027    import javax.servlet.jsp.tagext.TagSupport;
028    import javax.servlet.jsp.JspException;
029    import javax.faces.webapp.UIComponentTag;
030    import javax.faces.component.UIComponent;
031    import javax.faces.component.EditableValueHolder;
032    import javax.faces.component.ValueHolder;
033    import javax.faces.el.ValueBinding;
034    import javax.faces.context.FacesContext;
035    
036    /*
037     * Date: Oct 14, 2006
038     * Time: 1:47:13 PM
039     */
040    
041    /**
042     * Add an attribute on the UIComponent
043     * associated with the closest parent UIComponent custom action.
044     */
045    @Tag(name = "attribute", bodyContent = BodyContent.EMPTY)
046    public class AttributeTag extends TagSupport {
047    
048      private static final long serialVersionUID = 6231531736083277631L;
049    
050      /**
051       * <p>The name of the attribute</p>
052       */
053      private String name;
054    
055      /**
056       * <p>The value of the attribute</p>
057       */
058      private String value;
059    
060      /**
061       * The name of a attribute.
062       *
063       * @param name A attribute name
064       */
065      @TagAttribute(required = true)
066      public void setName(String name) {
067        this.name = name;
068      }
069    
070      /**
071       * The value of a attribute
072       *
073       * @param value A attribute value
074       */
075      @TagAttribute(required = true)
076      public void setValue(String value) {
077        this.value = value;
078      }
079    
080      /**
081       * @throws javax.servlet.jsp.JspException if a JSP error occurs
082       */
083      public int doStartTag() throws JspException {
084    
085        // Locate our parent UIComponentTag
086        UIComponentTag tag =
087            UIComponentTag.getParentUIComponentTag(pageContext);
088        if (tag == null) {
089          // TODO Message resource i18n
090          throw new JspException("Not nested in faces tag");
091        }
092    
093        if (!tag.getCreated()) {
094          return (SKIP_BODY);
095        }
096    
097        UIComponent component = tag.getComponentInstance();
098        if (component == null) {
099          // TODO Message resource i18n
100          throw new JspException("Component Instance is null");
101        }
102        String attributeName = name;
103    
104        if (UIComponentTag.isValueReference(name)) {
105          ValueBinding valueBinding = ComponentUtil.createValueBinding(name);
106          if (valueBinding != null) {
107            attributeName = (String) valueBinding.getValue(FacesContext.getCurrentInstance());
108          } else {
109            // TODO Message resource i18n
110            throw new JspException("Can not get ValueBinding for attribute name " + name);
111          }
112        }
113        if (component instanceof EditableValueHolder
114            && TobagoConstants.ATTR_VALIDATOR.equals(attributeName)) {
115          ComponentUtil.setValidator((EditableValueHolder) component, value);
116        } else if (component instanceof ValueHolder
117            && TobagoConstants.ATTR_CONVERTER.equals(attributeName)) {
118          ComponentUtil.setConverter((ValueHolder) component, value);
119        } else if (TobagoConstants.ATTR_STYLE_CLASS.equals(attributeName)) {
120          ComponentUtil.setStyleClasses(component, value);
121        } else if (TobagoConstants.ATTR_RENDERED_PARTIALLY.equals(attributeName)
122            && component instanceof UICommand) {
123          ComponentUtil.setRenderedPartially((UICommand) component, value);
124        } else if (UIComponentTag.isValueReference(value)) {
125          ValueBinding valueBinding = ComponentUtil.createValueBinding(value);
126          if (valueBinding != null) {
127            component.setValueBinding(name, valueBinding);
128          } else {
129            // TODO Message resource i18n
130            throw new JspException("Can not get ValueBinding for attribute value " + value);
131          }
132        } else {
133          component.getAttributes().put(attributeName, value);
134        }
135    
136        return (SKIP_BODY);
137      }
138    
139    
140      /**
141       * <p>Release references to any acquired resources.
142       */
143      public void release() {
144        super.release();
145        this.name = null;
146        this.value = null;
147      }
148    }