| // 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.script; |
| |
| import java.util.Iterator; |
| import java.util.Map; |
| |
| import org.apache.tapestry.ILocation; |
| import org.apache.tapestry.Tapestry; |
| |
| /** |
| * A looping operator, modeled after the Foreach component. It takes |
| * as its source as property and iterates through the values, updating |
| * a symbol on each pass. |
| * |
| * <p>As of 3.0, the index attribute has been added to foreach to keep |
| * track of the current index of the iterating collection.</p> |
| * |
| * @author Howard Lewis Ship, Harish Krishnaswamy |
| * @version $Id$ |
| * @since 1.0.1 |
| * |
| **/ |
| |
| class ForeachToken extends AbstractToken |
| { |
| private String _key; |
| private String _index; |
| private String _expression; |
| |
| ForeachToken(String key, String index, String expression, ILocation location) |
| { |
| super(location); |
| |
| _key = key; |
| _index = index; |
| _expression = expression; |
| } |
| |
| public void write(StringBuffer buffer, ScriptSession session) |
| { |
| Map symbols = session.getSymbols(); |
| |
| Object rawSource = evaluate(_expression, session); |
| |
| Iterator i = Tapestry.coerceToIterator(rawSource); |
| |
| if (i == null) |
| return; |
| |
| int index = 0; |
| |
| while (i.hasNext()) |
| { |
| Object newValue = i.next(); |
| |
| symbols.put(_key, newValue); |
| |
| if (_index != null) |
| symbols.put(_index, String.valueOf(index)); |
| |
| writeChildren(buffer, session); |
| |
| index++; |
| } |
| |
| // We leave the last value as a symbol; don't know if that's |
| // good or bad. |
| } |
| } |