001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry.form;
016    
017    import org.apache.tapestry.IMarkupWriter;
018    import org.apache.tapestry.IRequestCycle;
019    import org.apache.tapestry.valid.ValidatorException;
020    
021    /**
022     * Implements a component that manages an HTML <textarea> form element.
023     *
024     * [<a href="../../../../../ComponentReference/TextArea.html">Component Reference</a>]
025     * <p>
026     * As of 4.0, this component can be configurably translated and validated.
027     *
028     * @author Howard Lewis Ship
029     * @author Paul Ferraro
030     */
031    public abstract class TextArea extends AbstractFormComponent implements TranslatedField
032    {
033        public abstract String getValue();
034        
035        public abstract void setValue(String value);
036        
037        /**
038         * @see org.apache.tapestry.form.AbstractFormComponent#renderFormComponent(org.apache.tapestry.IMarkupWriter, org.apache.tapestry.IRequestCycle)
039         */
040        protected void renderFormComponent(IMarkupWriter writer, IRequestCycle cycle)
041        {
042            String value = getTranslatedFieldSupport().format(this, getValue());
043            
044            renderDelegatePrefix(writer, cycle);
045            
046            writer.begin("textarea");
047    
048            writer.attribute("name", getName());
049    
050            if (isDisabled())
051                writer.attribute("disabled", "disabled");
052    
053            renderIdAttribute(writer, cycle);
054    
055            renderDelegateAttributes(writer, cycle);
056            
057            getTranslatedFieldSupport().renderContributions(this, writer, cycle);
058            getValidatableFieldSupport().renderContributions(this, writer, cycle);
059            
060            renderInformalParameters(writer, cycle);
061    
062            if (value != null)
063                writer.print(value);
064    
065            writer.end();
066            
067            renderDelegateSuffix(writer, cycle);
068        }
069    
070        /**
071         * @see org.apache.tapestry.form.AbstractFormComponent#rewindFormComponent(org.apache.tapestry.IMarkupWriter, org.apache.tapestry.IRequestCycle)
072         */
073        protected void rewindFormComponent(IMarkupWriter writer, IRequestCycle cycle)
074        {
075            String value = cycle.getParameter(getName());
076            
077            try
078            {
079                String text = (String) getTranslatedFieldSupport().parse(this, value);
080                
081                getValidatableFieldSupport().validate(this, writer, cycle, text);
082                
083                setValue(text);
084            }
085            catch (ValidatorException e)
086            {
087                getForm().getDelegate().record(e);
088            }
089        }
090    
091        /**
092         * Injected.
093         */
094        public abstract ValidatableFieldSupport getValidatableFieldSupport();
095    
096        /**
097         * Injected.
098         */
099        public abstract TranslatedFieldSupport getTranslatedFieldSupport();
100    
101        /**
102         * @see org.apache.tapestry.form.AbstractFormComponent#isRequired()
103         */
104        public boolean isRequired()
105        {
106            return getValidatableFieldSupport().isRequired(this);
107        }
108    }