| // 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 org.apache.tapestry.IForm; |
| import org.apache.tapestry.IMarkupWriter; |
| import org.apache.tapestry.IRequestCycle; |
| |
| /** |
| * Base class for implementing various types of text input fields. |
| * This includes {@link TextField} and |
| * {@link org.apache.tapestry.valid.ValidField}. |
| * |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * @since 1.0.2 |
| * |
| **/ |
| |
| public abstract class AbstractTextField extends AbstractFormComponent |
| { |
| /** |
| * Renders the form element, or responds when the form containing the element |
| * is submitted (by checking {@link Form#isRewinding()}. |
| * |
| **/ |
| |
| protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) |
| { |
| String value; |
| |
| IForm form = getForm(cycle); |
| |
| // It isn't enough to know whether the cycle in general is rewinding, need to know |
| // specifically if the form which contains this component is rewinding. |
| |
| boolean rewinding = form.isRewinding(); |
| |
| // If the cycle is rewinding, but the form containing this field is not, |
| // then there's no point in doing more work. |
| |
| if (!rewinding && cycle.isRewinding()) |
| return; |
| |
| // Used whether rewinding or not. |
| |
| String name = form.getElementId(this); |
| |
| if (rewinding) |
| { |
| if (!isDisabled()) |
| { |
| value = cycle.getRequestContext().getParameter(name); |
| |
| updateValue(value); |
| } |
| |
| return; |
| } |
| |
| writer.beginEmpty("input"); |
| |
| writer.attribute("type", isHidden() ? "password" : "text"); |
| |
| if (isDisabled()) |
| writer.attribute("disabled", "disabled"); |
| |
| writer.attribute("name", name); |
| |
| value = readValue(); |
| if (value != null) |
| writer.attribute("value", value); |
| |
| renderInformalParameters(writer, cycle); |
| |
| beforeCloseTag(writer, cycle); |
| |
| writer.closeTag(); |
| } |
| |
| /** |
| * Invoked from {@link #render(IMarkupWriter, IRequestCycle)} |
| * just before the tag is closed. This implementation does nothing, |
| * subclasses may override. |
| * |
| **/ |
| |
| protected void beforeCloseTag(IMarkupWriter writer, IRequestCycle cycle) |
| { |
| // Do nothing. |
| } |
| |
| /** |
| * Invoked by {@link #render(IMarkupWriter writer, IRequestCycle cycle)} |
| * when a value is obtained from the |
| * {@link javax.servlet.http.HttpServletRequest}. |
| * |
| **/ |
| |
| abstract protected void updateValue(String value); |
| |
| /** |
| * Invoked by {@link #render(IMarkupWriter writer, IRequestCycle cycle)} |
| * when rendering a response. |
| * |
| * @return the current value for the field, as a String, or null. |
| **/ |
| |
| abstract protected String readValue(); |
| |
| public abstract boolean isHidden(); |
| |
| public abstract boolean isDisabled(); |
| } |