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30 day Evaluation Version distributed via the Maven Jar Repository. Clover is not free. You have 30 days to evaluate it. Please visit http://www.thecortex.net/clover to obtain a licensed version of Clover | |||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
FormSupportImpl.java | 98.4% | 99.4% | 100% | 99.2% |
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// Copyright 2005 The Apache Software Foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package org.apache.tapestry.form;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import org.apache.hivemind.ApplicationRuntimeException;
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import org.apache.hivemind.HiveMind;
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import org.apache.hivemind.Location;
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import org.apache.hivemind.util.Defense;
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import org.apache.tapestry.FormSupport;
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import org.apache.tapestry.IComponent;
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import org.apache.tapestry.IForm;
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import org.apache.tapestry.IMarkupWriter;
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import org.apache.tapestry.IRender;
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import org.apache.tapestry.IRequestCycle;
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import org.apache.tapestry.NestedMarkupWriter;
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import org.apache.tapestry.PageRenderSupport;
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import org.apache.tapestry.StaleLinkException;
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import org.apache.tapestry.Tapestry;
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import org.apache.tapestry.TapestryUtils;
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import org.apache.tapestry.engine.ILink;
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import org.apache.tapestry.services.ServiceConstants;
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import org.apache.tapestry.util.IdAllocator;
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/**
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* Encapsulates most of the behavior of a Form component.
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*
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* @author Howard M. Lewis Ship
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* @since 4.0
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*/
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public class FormSupportImpl implements FormSupport |
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{ |
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/**
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* Name of query parameter storing the ids alloocated while rendering the form, as a comma
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* seperated list. This information is used when the form is submitted, to ensure that the
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* rewind allocates the exact same sequence of ids.
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*/
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public static final String FORM_IDS = "formids"; |
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/**
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* Names of additional ids that were pre-reserved, as a comma-sepereated list. These are names
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* beyond that standard set. Certain engine services include extra parameter values that must be
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* accounted for, and page properties may be encoded as additional query parameters.
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*/
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public static final String RESERVED_FORM_IDS = "reservedids"; |
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private final static Set _standardReservedIds; |
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static
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{ |
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Set set = new HashSet();
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set.addAll(Arrays.asList(ServiceConstants.RESERVED_IDS)); |
77 | 1 |
set.add(FORM_IDS); |
78 | 1 |
set.add(RESERVED_FORM_IDS); |
79 |
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_standardReservedIds = Collections.unmodifiableSet(set); |
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} |
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/**
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* Used when rewinding the form to figure to match allocated ids (allocated during the rewind)
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* against expected ids (allocated in the previous request cycle, when the form was rendered).
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*/
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private int _allocatedIdIndex; |
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/**
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* The list of allocated ids for form elements within this form. This list is constructed when a
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* form renders, and is validated against when the form is rewound.
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*/
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private final List _allocatedIds = new ArrayList(); |
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private final IRequestCycle _cycle;
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private final IdAllocator _elementIdAllocator = new IdAllocator(); |
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private String _encodingType;
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/**
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* Map keyed on extended component id, value is the pre-rendered markup for that component.
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*/
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private final Map _prerenderMap = new HashMap(); |
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/**
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* {@link Map}, keyed on {@link FormEventType}. Values are either a String (the function name
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* of a single event handler), or a List of Strings (a sequence of event handler function
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* names).
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*/
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private Map _events;
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private final IForm _form;
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private final List _hiddenValues = new ArrayList(); |
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private boolean _rewinding; |
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private final IMarkupWriter _writer;
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125 | 113 |
public FormSupportImpl(IMarkupWriter writer, IRequestCycle cycle, IForm form)
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{ |
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127 | 113 |
Defense.notNull(writer, "writer");
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128 | 113 |
Defense.notNull(cycle, "cycle");
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129 | 113 |
Defense.notNull(form, "form");
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_writer = writer; |
132 | 113 |
_cycle = cycle; |
133 | 113 |
_form = form; |
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135 | 113 |
_rewinding = cycle.isRewound(form); |
136 | 113 |
_allocatedIdIndex = 0; |
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} |
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/**
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* Adds an event handler for the form, of the given type.
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*/
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143 | 10 |
public void addEventHandler(FormEventType type, String functionName) |
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{ |
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145 | 10 |
if (_events == null) |
146 | 5 |
_events = new HashMap();
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148 | 10 |
Object value = _events.get(type); |
149 |
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// The value can either be a String, or a List of String. Since
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// it is rare for there to be more than one event handling function,
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// we start with just a String.
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154 | 10 |
if (value == null) |
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{ |
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_events.put(type, functionName); |
157 | 5 |
return;
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} |
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// The second function added converts it to a List.
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if (value instanceof String) |
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{ |
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List list = new ArrayList();
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list.add(value); |
166 | 4 |
list.add(functionName); |
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_events.put(type, list); |
169 | 4 |
return;
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} |
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// The third and subsequent function just
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// adds to the List.
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175 | 1 |
List list = (List) value; |
176 | 1 |
list.add(functionName); |
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} |
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/**
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* Adds hidden fields for parameters provided by the {@link ILink}. These parameters define the
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* information needed to dispatch the request, plus state information. The names of these
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* parameters must be reserved so that conflicts don't occur that could disrupt the request
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* processing. For example, if the id 'page' is not reserved, then a conflict could occur with a
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* component whose id is 'page'. A certain number of ids are always reserved, and we find any
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* additional ids beyond that set.
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*/
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188 | 71 |
private void addHiddenFieldsForLinkParameters(ILink link) |
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{ |
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190 | 71 |
String[] names = link.getParameterNames(); |
191 | 71 |
int count = Tapestry.size(names);
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193 | 71 |
StringBuffer extraIds = new StringBuffer();
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194 | 71 |
String sep = "";
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195 | 71 |
boolean hasExtra = false; |
196 |
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// All the reserved ids, which are essential for
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// dispatching the request, are automatically reserved.
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// Thus, if you have a component with an id of 'service', its element id
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// will likely be 'service$0'.
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202 | 71 |
preallocateReservedIds(); |
203 |
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204 | 71 |
for (int i = 0; i < count; i++) |
205 |
{ |
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206 | 381 |
String name = names[i]; |
207 |
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// Reserve the name.
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209 |
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210 | 381 |
if (!_standardReservedIds.contains(name))
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{ |
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212 | 17 |
_elementIdAllocator.allocateId(name); |
213 |
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214 | 17 |
extraIds.append(sep); |
215 | 17 |
extraIds.append(name); |
216 |
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217 | 17 |
sep = ",";
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218 | 17 |
hasExtra = true;
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} |
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221 | 381 |
addHiddenFieldsForLinkParameter(link, name); |
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} |
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224 | 71 |
if (hasExtra)
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225 | 17 |
addHiddenValue(RESERVED_FORM_IDS, extraIds.toString()); |
226 |
} |
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227 |
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228 | 262 |
public void addHiddenValue(String name, String value) |
229 |
{ |
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230 | 262 |
_hiddenValues.add(new HiddenFieldData(name, value));
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} |
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233 | 5 |
public void addHiddenValue(String name, String id, String value) |
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{ |
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235 | 5 |
_hiddenValues.add(new HiddenFieldData(name, id, value));
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} |
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/**
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* Converts the allocateIds property into a string, a comma-separated list of ids. This is
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* included as a hidden field in the form and is used to identify discrepencies when the form is
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* submitted.
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*/
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243 |
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244 | 65 |
private String buildAllocatedIdList()
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{ |
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246 | 65 |
StringBuffer buffer = new StringBuffer();
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247 | 65 |
int count = _allocatedIds.size();
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248 |
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249 | 65 |
for (int i = 0; i < count; i++) |
250 |
{ |
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251 | 70 |
if (i > 0)
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252 | 26 |
buffer.append(','); |
253 |
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254 | 70 |
buffer.append(_allocatedIds.get(i)); |
255 |
} |
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256 |
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257 | 65 |
return buffer.toString();
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} |
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259 |
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260 | 65 |
private void emitEventHandlers() |
261 |
{ |
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262 | 65 |
if (_events == null || _events.isEmpty()) |
263 | 60 |
return;
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264 |
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265 | 5 |
PageRenderSupport pageRenderSupport = TapestryUtils.getPageRenderSupport(_cycle, _form); |
266 |
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267 | 5 |
StringBuffer buffer = new StringBuffer();
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268 |
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269 | 5 |
Iterator i = _events.entrySet().iterator(); |
270 | 5 |
while (i.hasNext())
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{ |
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273 | 5 |
Map.Entry entry = (Map.Entry) i.next(); |
274 | 5 |
FormEventType type = (FormEventType) entry.getKey(); |
275 | 5 |
Object value = entry.getValue(); |
276 |
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277 | 5 |
buffer.append("document.");
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278 | 5 |
buffer.append(_form.getName()); |
279 | 5 |
buffer.append(".");
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280 | 5 |
buffer.append(type.getPropertyName()); |
281 | 5 |
buffer.append(" = ");
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282 |
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// The typical case; one event one event handler. Easy enough.
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284 |
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285 | 5 |
if (value instanceof String) |
286 |
{ |
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287 | 1 |
buffer.append(value.toString()); |
288 | 1 |
buffer.append(";");
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} |
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else
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{ |
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292 |
// Build a composite function in-place
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293 |
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294 | 4 |
buffer.append("function ()\n{");
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295 |
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296 | 4 |
boolean combineWithAnd = type.getCombineUsingAnd();
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297 |
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298 | 4 |
List l = (List) value; |
299 | 4 |
int count = l.size();
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300 |
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301 | 4 |
for (int j = 0; j < count; j++) |
302 |
{ |
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303 | 9 |
String functionName = (String) l.get(j); |
304 |
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305 | 9 |
if (j > 0)
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{ |
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307 |
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308 | 5 |
if (combineWithAnd)
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309 | 4 |
buffer.append(" &&");
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310 |
else
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311 | 1 |
buffer.append(";");
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312 |
} |
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313 |
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314 | 9 |
buffer.append("\n ");
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315 |
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|
316 | 9 |
if (combineWithAnd)
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317 |
{ |
|
318 | 7 |
if (j == 0)
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319 | 3 |
buffer.append("return ");
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320 |
else
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321 | 4 |
buffer.append(" ");
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322 |
} |
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323 |
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324 | 9 |
buffer.append(functionName); |
325 | 9 |
buffer.append("()");
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326 |
} |
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327 |
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328 | 4 |
buffer.append(";\n}");
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329 |
} |
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330 |
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|
331 | 5 |
buffer.append("\n");
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332 |
} |
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333 |
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334 | 5 |
pageRenderSupport.addInitializationScript(buffer.toString()); |
335 |
} |
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336 |
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337 |
/**
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338 |
* Constructs a unique identifier (within the Form). The identifier consists of the component's
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339 |
* id, with an index number added to ensure uniqueness.
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340 |
* <p>
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341 |
* Simply invokes
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342 |
* {@link #getElementId(org.apache.tapestry.form.IFormComponent, java.lang.String)}with the
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343 |
* component's id.
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344 |
*/
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345 |
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346 | 18 |
public String getElementId(IFormComponent component)
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347 |
{ |
|
348 | 18 |
return getElementId(component, component.getId());
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349 |
} |
|
350 |
|
|
351 |
/**
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352 |
* Constructs a unique identifier (within the Form). The identifier consists of the component's
|
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353 |
* id, with an index number added to ensure uniqueness.
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354 |
* <p>
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355 |
* Simply invokes
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356 |
* {@link #getElementId(org.apache.tapestry.form.IFormComponent, java.lang.String)}with the
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357 |
* component's id.
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358 |
*/
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359 |
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|
360 | 140 |
public String getElementId(IFormComponent component, String baseId)
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361 |
{ |
|
362 | 140 |
String result = _elementIdAllocator.allocateId(baseId); |
363 |
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|
364 | 140 |
if (_rewinding)
|
365 |
{ |
|
366 | 67 |
if (_allocatedIdIndex >= _allocatedIds.size())
|
367 |
{ |
|
368 | 1 |
throw new StaleLinkException(FormMessages.formTooManyIds(_form, _allocatedIds |
369 |
.size(), component), component); |
|
370 |
} |
|
371 |
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|
372 | 66 |
String expected = (String) _allocatedIds.get(_allocatedIdIndex); |
373 |
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|
374 | 66 |
if (!result.equals(expected))
|
375 | 2 |
throw new StaleLinkException(FormMessages.formIdMismatch( |
376 |
_form, |
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377 |
_allocatedIdIndex, |
|
378 |
expected, |
|
379 |
result, |
|
380 |
component), component); |
|
381 |
} |
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382 |
else
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383 |
{ |
|
384 | 73 |
_allocatedIds.add(result); |
385 |
} |
|
386 |
|
|
387 | 137 |
_allocatedIdIndex++; |
388 |
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|
389 | 137 |
component.setName(result); |
390 |
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|
391 | 137 |
return result;
|
392 |
} |
|
393 |
|
|
394 | 221 |
public boolean isRewinding() |
395 |
{ |
|
396 | 221 |
return _rewinding;
|
397 |
} |
|
398 |
|
|
399 | 113 |
private void preallocateReservedIds() |
400 |
{ |
|
401 | 113 |
for (int i = 0; i < ServiceConstants.RESERVED_IDS.length; i++) |
402 | 678 |
_elementIdAllocator.allocateId(ServiceConstants.RESERVED_IDS[i]); |
403 |
} |
|
404 |
|
|
405 |
/**
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|
406 |
* Invoked when rewinding a form to re-initialize the _allocatedIds and _elementIdAllocator.
|
|
407 |
* Converts a string passed as a parameter (and containing a comma separated list of ids) back
|
|
408 |
* into the allocateIds property. In addition, return the state of the ID allocater back to
|
|
409 |
* where it was at the start of the render.
|
|
410 |
*
|
|
411 |
* @see #buildAllocatedIdList()
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|
412 |
* @since 3.0
|
|
413 |
*/
|
|
414 |
|
|
415 | 42 |
private void reinitializeIdAllocatorForRewind() |
416 |
{ |
|
417 | 42 |
String allocatedFormIds = _cycle.getParameter(FORM_IDS); |
418 |
|
|
419 | 42 |
String[] ids = TapestryUtils.split(allocatedFormIds); |
420 |
|
|
421 | 42 |
for (int i = 0; i < ids.length; i++) |
422 | 71 |
_allocatedIds.add(ids[i]); |
423 |
|
|
424 |
// Now, reconstruct the the initial state of the
|
|
425 |
// id allocator.
|
|
426 |
|
|
427 | 42 |
preallocateReservedIds(); |
428 |
|
|
429 | 42 |
String extraReservedIds = _cycle.getParameter(RESERVED_FORM_IDS); |
430 |
|
|
431 | 42 |
ids = TapestryUtils.split(extraReservedIds); |
432 |
|
|
433 | 42 |
for (int i = 0; i < ids.length; i++) |
434 | 3 |
_elementIdAllocator.allocateId(ids[i]); |
435 |
} |
|
436 |
|
|
437 | 71 |
public void render(String method, IRender informalParametersRenderer, ILink link) |
438 |
{ |
|
439 |
// Convert the link's query parameters into a series of
|
|
440 |
// hidden field values (that will be rendered later).
|
|
441 |
|
|
442 | 71 |
addHiddenFieldsForLinkParameters(link); |
443 |
|
|
444 | 71 |
IMarkupWriter nested = _writer.getNestedWriter(); |
445 |
|
|
446 | 71 |
_form.renderBody(nested, _cycle); |
447 |
|
|
448 | 65 |
writeTag(_writer, method, link.getURL(null, false)); |
449 |
|
|
450 | 65 |
_writer.attribute("name", _form.getName());
|
451 |
|
|
452 | 65 |
if (_encodingType != null) |
453 | 3 |
_writer.attribute("enctype", _encodingType);
|
454 |
|
|
455 |
// Write out event handlers collected during the rendering.
|
|
456 |
|
|
457 | 65 |
emitEventHandlers(); |
458 |
|
|
459 | 65 |
informalParametersRenderer.render(_writer, _cycle); |
460 |
|
|
461 |
// Finish the <form> tag
|
|
462 |
|
|
463 | 65 |
_writer.println(); |
464 |
|
|
465 | 65 |
writeHiddenField(FORM_IDS, null, buildAllocatedIdList());
|
466 | 65 |
writeHiddenFields(); |
467 |
|
|
468 |
// Close the nested writer, inserting its contents.
|
|
469 |
|
|
470 | 65 |
nested.close(); |
471 |
|
|
472 |
// Close the <form> tag.
|
|
473 |
|
|
474 | 65 |
_writer.end(); |
475 |
} |
|
476 |
|
|
477 | 42 |
public void rewind() |
478 |
{ |
|
479 | 42 |
reinitializeIdAllocatorForRewind(); |
480 |
|
|
481 | 42 |
_form.renderBody(_writer, _cycle); |
482 |
|
|
483 | 38 |
int expected = _allocatedIds.size();
|
484 |
|
|
485 |
// The other case, _allocatedIdIndex > expected, is
|
|
486 |
// checked for inside getElementId(). Remember that
|
|
487 |
// _allocatedIdIndex is incremented after allocating.
|
|
488 |
|
|
489 | 38 |
if (_allocatedIdIndex < expected)
|
490 |
{ |
|
491 | 1 |
String nextExpectedId = (String) _allocatedIds.get(_allocatedIdIndex); |
492 |
|
|
493 | 1 |
throw new StaleLinkException(FormMessages.formTooFewIds(_form, expected |
494 |
- _allocatedIdIndex, nextExpectedId), _form); |
|
495 |
} |
|
496 |
} |
|
497 |
|
|
498 | 5 |
public void setEncodingType(String encodingType) |
499 |
{ |
|
500 |
|
|
501 | 5 |
if (_encodingType != null && !_encodingType.equals(encodingType)) |
502 | 1 |
throw new ApplicationRuntimeException(FormMessages.encodingTypeContention( |
503 |
_form, |
|
504 |
_encodingType, |
|
505 |
encodingType), _form, null, null); |
|
506 |
|
|
507 | 4 |
_encodingType = encodingType; |
508 |
} |
|
509 |
|
|
510 | 282 |
protected void writeHiddenField(IMarkupWriter writer, String name, String id, String value) |
511 |
{ |
|
512 | 282 |
writer.beginEmpty("input");
|
513 | 282 |
writer.attribute("type", "hidden"); |
514 | 282 |
writer.attribute("name", name);
|
515 |
|
|
516 | 282 |
if (HiveMind.isNonBlank(id))
|
517 | 2 |
writer.attribute("id", id);
|
518 |
|
|
519 | 282 |
writer.attribute("value", value);
|
520 | 282 |
writer.println(); |
521 |
} |
|
522 |
|
|
523 | 312 |
private void writeHiddenField(String name, String id, String value) |
524 |
{ |
|
525 | 312 |
writeHiddenField(_writer, name, id, value); |
526 |
} |
|
527 |
|
|
528 |
/**
|
|
529 |
* Writes out all hidden values previously added by
|
|
530 |
* {@link #addHiddenValue(String, String, String)}.
|
|
531 |
*/
|
|
532 |
|
|
533 | 65 |
private void writeHiddenFields() |
534 |
{ |
|
535 | 65 |
Iterator i = _hiddenValues.iterator(); |
536 | 65 |
while (i.hasNext())
|
537 |
{ |
|
538 | 247 |
HiddenFieldData data = (HiddenFieldData) i.next(); |
539 |
|
|
540 | 247 |
writeHiddenField(data.getName(), data.getId(), data.getValue()); |
541 |
} |
|
542 |
} |
|
543 |
|
|
544 | 381 |
private void addHiddenFieldsForLinkParameter(ILink link, String parameterName) |
545 |
{ |
|
546 | 381 |
String[] values = link.getParameterValues(parameterName); |
547 |
|
|
548 |
// In some cases, there are no values, but a space is "reserved" for the provided name.
|
|
549 |
|
|
550 | 381 |
if (values == null) |
551 | 143 |
return;
|
552 |
|
|
553 | 238 |
for (int i = 0; i < values.length; i++) |
554 |
{ |
|
555 | 238 |
addHiddenValue(parameterName, values[i]); |
556 |
} |
|
557 |
} |
|
558 |
|
|
559 | 59 |
protected void writeTag(IMarkupWriter writer, String method, String url) |
560 |
{ |
|
561 | 59 |
writer.begin("form");
|
562 | 59 |
writer.attribute("method", method);
|
563 | 59 |
writer.attribute("action", url);
|
564 |
} |
|
565 |
|
|
566 | 5 |
public void prerenderField(IMarkupWriter writer, IComponent field, Location location) |
567 |
{ |
|
568 | 5 |
Defense.notNull(writer, "writer");
|
569 | 5 |
Defense.notNull(field, "field");
|
570 |
|
|
571 | 5 |
String key = field.getExtendedId(); |
572 |
|
|
573 | 5 |
if (_prerenderMap.containsKey(key))
|
574 | 0 |
throw new ApplicationRuntimeException(FormMessages.fieldAlreadyPrerendered(field), |
575 |
location, null);
|
|
576 |
|
|
577 | 5 |
NestedMarkupWriter nested = writer.getNestedWriter(); |
578 |
|
|
579 | 5 |
field.render(nested, _cycle); |
580 |
|
|
581 | 5 |
_prerenderMap.put(key, nested.getBuffer()); |
582 |
} |
|
583 |
|
|
584 | 106 |
public boolean wasPrerendered(IMarkupWriter writer, IComponent field) |
585 |
{ |
|
586 | 106 |
String key = field.getExtendedId(); |
587 |
|
|
588 | 106 |
String buffer = (String) _prerenderMap.get(key); |
589 |
|
|
590 | 106 |
if (buffer == null) |
591 | 101 |
return false; |
592 |
|
|
593 | 5 |
writer.printRaw(buffer); |
594 |
|
|
595 | 5 |
_prerenderMap.remove(key); |
596 |
|
|
597 | 5 |
return true; |
598 |
} |
|
599 |
} |
|