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| package org.apache.tapestry.form; |
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| import org.apache.hivemind.ApplicationRuntimeException; |
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| import org.apache.tapestry.IMarkupWriter; |
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| import org.apache.tapestry.IRequestCycle; |
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| import org.apache.tapestry.Tapestry; |
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| import org.apache.tapestry.valid.ValidatorException; |
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| public abstract class RadioGroup extends AbstractFormComponent implements ValidatableField |
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| { |
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| private Object _selection; |
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| private int _selectedOption; |
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| private boolean _rewinding; |
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| private boolean _rendering; |
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| private int _nextOptionId; |
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| private static final String ATTRIBUTE_NAME = "org.apache.tapestry.active.RadioGroup"; |
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| public static RadioGroup get(IRequestCycle cycle)
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| { |
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| return (RadioGroup) cycle.getAttribute(ATTRIBUTE_NAME);
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| } |
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| public int getNextOptionId()
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| { |
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| if (!_rendering)
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| throw Tapestry.createRenderOnlyPropertyException(this, "nextOptionId");
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| return _nextOptionId++;
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| } |
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| public boolean isRewinding()
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| { |
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| if (!_rendering)
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| throw Tapestry.createRenderOnlyPropertyException(this, "rewinding");
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| return _rewinding;
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| } |
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| public boolean isSelection(Object value)
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| { |
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| if (!_rendering)
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| throw Tapestry.createRenderOnlyPropertyException(this, "selection");
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| if (_selection == value)
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| return true;
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| if (_selection == null || value == null)
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| return false;
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| return _selection.equals(value);
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| } |
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| public void updateSelection(Object value)
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| { |
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| getBinding("selected").setObject(value);
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| _selection = value;
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| } |
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| public boolean isSelected(int option)
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| { |
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| return _selectedOption == option;
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| } |
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| protected void prepareForRender(IRequestCycle cycle)
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| { |
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| if (cycle.getAttribute(ATTRIBUTE_NAME) != null)
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| throw new ApplicationRuntimeException(Tapestry.getMessage("RadioGroup.may-not-nest"),
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| this, null, null); |
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| cycle.setAttribute(ATTRIBUTE_NAME, this);
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| _rendering = true;
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| _nextOptionId = 0;
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| } |
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| protected void cleanupAfterRender(IRequestCycle cycle)
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| { |
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| _rendering = false;
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| _selection = null;
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| cycle.removeAttribute(ATTRIBUTE_NAME);
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| } |
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| protected void renderFormComponent(IMarkupWriter writer, IRequestCycle cycle)
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| { |
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| _rewinding = false;
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| _selection = getBinding("selected").getObject();
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| renderBody(writer, cycle);
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| getValidatableFieldSupport().renderContributions(this, writer, cycle);
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| } |
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| protected void rewindFormComponent(IMarkupWriter writer, IRequestCycle cycle)
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| { |
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| String value = cycle.getParameter(getName());
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| if (value == null)
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| _selectedOption = -1;
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| else |
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| _selectedOption = Integer.parseInt(value);
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| _rewinding = true;
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| renderBody(writer, cycle);
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| try
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| { |
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| getValidatableFieldSupport().validate(this, writer, cycle, _selection);
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| } |
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| catch (ValidatorException e) |
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| { |
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| getForm().getDelegate().record(e);
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| } |
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| } |
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| public abstract ValidatableFieldSupport getValidatableFieldSupport(); |
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| public boolean isRequired()
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| { |
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| return getValidatableFieldSupport().isRequired(this);
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| } |
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| protected boolean getCanTakeFocus()
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| { |
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| return false;
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| } |
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| protected boolean getAlwaysRenderBodyOnRewind()
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| { |
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| return true;
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| } |
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| } |