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      /**
049       * <p>The name of the attribute</p>
050       */
051      private String name;
052      /**
053       * <p>The value of the attribute</p>
054       */
055      private String value;
056      /**
057       * The name of a attribute.
058       * @param name  A attribute name
059       */
060      @TagAttribute(required = true)
061      public void setName(String name) {
062        this.name = name;
063      }
064    
065      /**
066       * The value of a attribute
067       * @param value A attribute value
068       */
069      @TagAttribute(required = true)
070      public void setValue(String value) {
071        this.value = value;
072      }
073    
074      /**
075       * @throws javax.servlet.jsp.JspException if a JSP error occurs
076       */
077      public int doStartTag() throws JspException {
078    
079        // Locate our parent UIComponentTag
080        UIComponentTag tag =
081            UIComponentTag.getParentUIComponentTag(pageContext);
082        if (tag == null) {
083          // TODO Message resource i18n
084          throw new JspException("Not nested in faces tag");
085        }
086    
087        if (!tag.getCreated()) {
088          return (SKIP_BODY);
089        }
090    
091        UIComponent component = tag.getComponentInstance();
092        if (component == null) {
093          // TODO Message resource i18n
094          throw new JspException("Component Instance is null");
095        }
096        String attributeName = name;
097    
098        if (UIComponentTag.isValueReference(name)) {
099          ValueBinding valueBinding = ComponentUtil.createValueBinding(name);
100          if (valueBinding != null) {
101            attributeName = (String) valueBinding.getValue(FacesContext.getCurrentInstance());
102          } else {
103             // TODO Message resource i18n
104            throw new JspException("Can not get ValueBinding for attribute name " + name);
105          }
106        }
107        if (component instanceof EditableValueHolder
108            && TobagoConstants.ATTR_VALIDATOR.equals(attributeName)) {
109          ComponentUtil.setValidator((EditableValueHolder) component, value);
110        } else if (component instanceof ValueHolder
111            && TobagoConstants.ATTR_CONVERTER.equals(attributeName)) {
112          ComponentUtil.setConverter((ValueHolder) component, value);
113        } else if (TobagoConstants.ATTR_STYLE_CLASS.equals(attributeName)) {
114          ComponentUtil.setStyleClasses(component, value);
115        } else if (TobagoConstants.ATTR_RENDERED_PARTIALLY.equals(attributeName)
116            && component instanceof UICommand) {
117          ComponentUtil.setRenderedPartially((UICommand) component, value);
118        } else if (UIComponentTag.isValueReference(value)) {
119          ValueBinding valueBinding = ComponentUtil.createValueBinding(value);
120          if (valueBinding != null) {
121            component.setValueBinding(name, valueBinding);
122          } else {
123             // TODO Message resource i18n
124            throw new JspException("Can not get ValueBinding for attribute value " + value);
125          }
126        } else {
127          component.getAttributes().put(attributeName, value);
128        }
129    
130        return (SKIP_BODY);
131      }
132    
133    
134      /**
135       * <p>Release references to any acquired resources.
136       */
137      public void release() {
138        super.release();
139        this.name = null;
140        this.value = null;
141      }
142    }