| // 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.Map; |
| |
| import org.apache.tapestry.ILocation; |
| |
| /** |
| * Allows for the creation of new symbols that can be used in the script |
| * or returned to the caller. |
| * |
| * <p>The <let> tag wraps around static text and <insert> |
| * elements. The results are trimmed. |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * @since 0.2.9 |
| * |
| **/ |
| |
| class LetToken extends AbstractToken |
| { |
| private String _key; |
| private boolean _unique; |
| private int _bufferLengthHighwater = 20; |
| |
| public LetToken(String key, boolean unique, ILocation location) |
| { |
| super(location); |
| |
| _key = key; |
| _unique = unique; |
| } |
| |
| public void write(StringBuffer buffer, ScriptSession session) |
| { |
| if (buffer != null) |
| throw new IllegalArgumentException(); |
| |
| buffer = new StringBuffer(_bufferLengthHighwater); |
| |
| writeChildren(buffer, session); |
| |
| // Store the symbol back into the root set of symbols. |
| |
| Map symbols = session.getSymbols(); |
| |
| String value = buffer.toString().trim(); |
| |
| if (_unique) |
| value = session.getProcessor().getUniqueString(value); |
| |
| symbols.put(_key, value); |
| |
| // Store the buffer length from this run for the next run, since its |
| // going to be approximately the right size. |
| |
| _bufferLengthHighwater = Math.max(_bufferLengthHighwater, buffer.length()); |
| } |
| } |