| // 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.wml; |
| |
| import org.apache.tapestry.ApplicationRuntimeException; |
| import org.apache.tapestry.IBinding; |
| import org.apache.tapestry.IForm; |
| import org.apache.tapestry.IMarkupWriter; |
| import org.apache.tapestry.IRequestCycle; |
| import org.apache.tapestry.Tapestry; |
| import org.apache.tapestry.form.AbstractFormComponent; |
| |
| /** |
| * A base class for building components that correspond to WML postfield elements. |
| * All such components must be wrapped (directly or indirectly) by |
| * a {@link Go} component. |
| * |
| * @version $Id$ |
| * @author David Solis |
| * @since 3.0 |
| * |
| **/ |
| |
| public abstract class AbstractPostfield extends AbstractFormComponent |
| { |
| |
| /** |
| * Returns the {@link org.apache.tapestry.wml.Go} wrapping this component. |
| * |
| * @throws ApplicationRuntimeException if the component is not wrapped by a |
| * {@link org.apache.tapestry.wml.Go}. |
| * |
| **/ |
| |
| public IForm getForm(IRequestCycle cycle) |
| { |
| IForm result = Go.get(cycle); |
| |
| if (result == null) |
| throw new ApplicationRuntimeException( |
| Tapestry.getMessage("Postfield.must-be-contained-by-go"), |
| this, |
| null, |
| null); |
| |
| setForm(result); |
| |
| return result; |
| } |
| |
| /** |
| * @see org.apache.tapestry.AbstractComponent#renderComponent(IMarkupWriter, IRequestCycle) |
| **/ |
| |
| protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) |
| { |
| IForm form = getForm(cycle); |
| |
| boolean rewinding = form.isRewinding(); |
| |
| if (!rewinding && cycle.isRewinding()) |
| return; |
| |
| String name = form.getElementId(this); |
| |
| if (rewinding) |
| { |
| rewind(cycle); |
| return; |
| } |
| |
| writer.beginEmpty("postfield"); |
| |
| writer.attribute("name", name); |
| String varName = getVarName(); |
| writer.attributeRaw("value", varName != null ? getEncodedVarName(varName) : ""); |
| |
| renderInformalParameters(writer, cycle); |
| |
| writer.closeTag(); |
| } |
| |
| protected abstract void rewind(IRequestCycle cycle); |
| |
| private String getEncodedVarName(String varName) |
| { |
| return "$(" + varName + ")"; |
| } |
| |
| public boolean isDisabled() |
| { |
| return false; |
| } |
| |
| public abstract String getVarName(); |
| |
| public abstract IBinding getValueBinding(); |
| |
| public void updateValue(Object value) |
| { |
| getValueBinding().setObject(value); |
| } |
| |
| public abstract IForm getForm(); |
| public abstract void setForm(IForm form); |
| |
| public abstract String getName(); |
| public abstract void setName(String name); |
| } |