| // 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.parse; |
| |
| import org.apache.commons.lang.builder.ToStringBuilder; |
| import org.apache.tapestry.ILocation; |
| import org.apache.tapestry.IMarkupWriter; |
| import org.apache.tapestry.IRender; |
| import org.apache.tapestry.IRequestCycle; |
| import org.apache.tapestry.Tapestry; |
| |
| /** |
| * Represents static text in the template that may be passed through |
| * to the client unchanged (except, perhaps, for the removal of |
| * some whitespace). |
| * |
| * @see TokenType#TEXT |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * @since 3.0 |
| * |
| **/ |
| |
| public class TextToken extends TemplateToken implements IRender |
| { |
| private char[] _templateData; |
| |
| private int _startIndex = -1; |
| private int _endIndex = -1; |
| |
| private int _offset; |
| private int _length; |
| private boolean _needsTrim = true; |
| |
| public TextToken(char[] templateData, int startIndex, int endIndex, ILocation location) |
| { |
| super(TokenType.TEXT, location); |
| |
| if (startIndex < 0 |
| || endIndex < 0 |
| || startIndex > templateData.length |
| || endIndex > templateData.length) |
| throw new IllegalArgumentException( |
| Tapestry.format( |
| "TextToken.range-error", |
| this, |
| Integer.toString(templateData.length))); |
| |
| _templateData = templateData; |
| _startIndex = startIndex; |
| _endIndex = endIndex; |
| |
| // Values actually used to render, may be adjusted to remove excess |
| // leading and trailing whitespace. |
| |
| _offset = startIndex; |
| _length = endIndex - startIndex + 1; |
| } |
| |
| public synchronized void render(IMarkupWriter writer, IRequestCycle cycle) |
| { |
| if (_needsTrim) |
| { |
| trim(); |
| _needsTrim = false; |
| } |
| |
| if (_length == 0) |
| return; |
| |
| // At one time, we would check to see if the cycle was rewinding and |
| // only invoke printRaw() if it was. However, that slows down |
| // normal rendering (microscopically) and, with the new |
| // NullResponseWriter class, the "cost" of invoking cycle.isRewinding() |
| // is approximately the same as the "cost" of invoking writer.printRaw(). |
| |
| writer.printRaw(_templateData, _offset, _length); |
| } |
| |
| /** |
| * Strip off all leading and trailing whitespace by adjusting offset and length. |
| * |
| **/ |
| |
| private void trim() |
| { |
| if (_length == 0) |
| return; |
| |
| try |
| { |
| boolean didTrim = false; |
| |
| // Shave characters off the end until we hit a non-whitespace |
| // character. |
| |
| while (_length > 0) |
| { |
| char ch = _templateData[_offset + _length - 1]; |
| |
| if (!Character.isWhitespace(ch)) |
| break; |
| |
| _length--; |
| didTrim = true; |
| } |
| |
| // Restore one character of whitespace to the end |
| |
| if (didTrim) |
| _length++; |
| |
| didTrim = false; |
| |
| // Strip characters off the front until we hit a non-whitespace |
| // character. |
| |
| while (_length > 0) |
| { |
| char ch = _templateData[_offset]; |
| |
| if (!Character.isWhitespace(ch)) |
| break; |
| |
| _offset++; |
| _length--; |
| didTrim = true; |
| } |
| |
| // Again, restore one character of whitespace. |
| |
| if (didTrim) |
| { |
| _offset--; |
| _length++; |
| } |
| |
| } |
| catch (IndexOutOfBoundsException ex) |
| { |
| throw new RuntimeException(Tapestry.format("TextToken.error-trimming", this)); |
| } |
| |
| // Ok, this isn't perfect. I don't want to write into templateData[] even |
| // though I'd prefer that my single character of whitespace was always a space. |
| // It would also be kind of neat to shave whitespace within the static HTML, rather |
| // than just on the edges. |
| } |
| |
| protected void extendDescription(ToStringBuilder builder) |
| { |
| builder.append("startIndex", _startIndex); |
| builder.append("endIndex", _endIndex); |
| } |
| |
| public int getEndIndex() |
| { |
| return _endIndex; |
| } |
| |
| public int getStartIndex() |
| { |
| return _startIndex; |
| } |
| |
| public char[] getTemplateData() |
| { |
| return _templateData; |
| } |
| |
| } |