| // Copyright 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.tapestry.form; |
| |
| import java.io.IOException; |
| |
| import org.apache.tapestry.ApplicationRuntimeException; |
| import org.apache.tapestry.IActionListener; |
| import org.apache.tapestry.IBinding; |
| import org.apache.tapestry.IForm; |
| import org.apache.tapestry.IMarkupWriter; |
| import org.apache.tapestry.IRequestCycle; |
| import org.apache.tapestry.util.io.DataSqueezer; |
| |
| /** |
| * Implements a hidden field within a {@link Form}. |
| * |
| * [<a href="../../../../../ComponentReference/Hidden.html">Component Reference</a>] |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * |
| **/ |
| |
| public abstract class Hidden extends AbstractFormComponent |
| { |
| |
| protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) |
| { |
| IForm form = getForm(cycle); |
| boolean formRewound = form.isRewinding(); |
| |
| String name = form.getElementId(this); |
| |
| // If the form containing the Hidden isn't rewound, then render. |
| |
| if (!formRewound) |
| { |
| // Optimiziation: if the page is rewinding (some other action or |
| // form was submitted), then don't bother rendering. |
| |
| if (cycle.isRewinding()) |
| return; |
| |
| String externalValue = null; |
| |
| if (getEncode()) |
| { |
| Object value = getValueBinding().getObject(); |
| |
| try |
| { |
| externalValue = getDataSqueezer().squeeze(value); |
| } |
| catch (IOException ex) |
| { |
| throw new ApplicationRuntimeException(ex.getMessage(), this, null, ex); |
| } |
| } |
| else |
| externalValue = (String) getValueBinding().getObject("value", String.class); |
| |
| String id = getElementId(); |
| //if we would like to test the IForm.addHiddenValue(name, externalValue) method with |
| //Hidden JUnit test the following code must be default. But from the performance issue |
| //I don't use the id parameter clauses. |
| /* if(id == null || id.length() == 0){ |
| form.addHiddenValue(name, externalValue); |
| }else{ |
| form.addHiddenValue(name, id, externalValue); |
| } |
| */ |
| form.addHiddenValue(name, id, externalValue); |
| |
| |
| return; |
| } |
| |
| String externalValue = cycle.getRequestContext().getParameter(name); |
| Object value = null; |
| |
| if (getEncode()) |
| { |
| try |
| { |
| value = getDataSqueezer().unsqueeze(externalValue); |
| } |
| catch (IOException ex) |
| { |
| throw new ApplicationRuntimeException(ex.getMessage(), this, null, ex); |
| } |
| } |
| else |
| value = externalValue; |
| |
| // A listener is not always necessary ... it's easy to code |
| // the synchronization as a side-effect of the accessor method. |
| |
| getValueBinding().setObject(value); |
| |
| IActionListener listener = getListener(); |
| |
| if (listener != null) |
| listener.actionTriggered(this, cycle); |
| } |
| |
| public String getElementId(){ |
| String value = null; |
| IBinding idBinding = getIdBinding(); |
| if(idBinding != null){ |
| value = idBinding.getString(); |
| } |
| return value; |
| } |
| |
| /** @since 2.2 **/ |
| |
| private DataSqueezer getDataSqueezer() |
| { |
| return getPage().getEngine().getDataSqueezer(); |
| } |
| |
| public abstract IActionListener getListener(); |
| |
| public abstract IBinding getValueBinding(); |
| public abstract IBinding getIdBinding(); |
| |
| /** |
| * |
| * Returns false. Hidden components are never disabled. |
| * |
| * @since 2.2 |
| * |
| **/ |
| |
| public boolean isDisabled() |
| { |
| return false; |
| } |
| |
| /** |
| * |
| * Returns true if the compent encodes object values using a |
| * {@link org.apache.tapestry.util.io.DataSqueezer}, false |
| * if values are always Strings. |
| * |
| * @since 2.2 |
| * |
| **/ |
| |
| public abstract boolean getEncode(); |
| |
| public abstract void setEncode(boolean encode); |
| |
| /** |
| * Sets the encode parameter property to its default, true. |
| * |
| * @since 3.0 |
| */ |
| protected void finishLoad() |
| { |
| setEncode(true); |
| } |
| } |