156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson/* 256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * Copyright (C) 2010 Google Inc. 356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * 456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * Licensed under the Apache License, Version 2.0 (the "License"); 556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * you may not use this file except in compliance with the License. 656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * You may obtain a copy of the License at 756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * 856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * http://www.apache.org/licenses/LICENSE-2.0 956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * 1056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * Unless required by applicable law or agreed to in writing, software 1156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * distributed under the License is distributed on an "AS IS" BASIS, 1256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * See the License for the specific language governing permissions and 1456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * limitations under the License. 1556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson */ 1656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 1756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodsonpackage com.google.clearsilver.jsilver.functions.escape; 1856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 1956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodsonimport com.google.clearsilver.jsilver.functions.TextFilter; 2056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 2156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodsonimport java.io.ByteArrayOutputStream; 2256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodsonimport java.io.IOException; 2356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodsonimport java.io.OutputStreamWriter; 2456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodsonimport java.io.UnsupportedEncodingException; 2556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodsonimport java.net.URLEncoder; 2656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 2756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson/** 2856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * This URL encodes the string. This converts characters such as ?, ampersands, and = into their URL 2956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * safe equivilants using the %hh syntax. 3056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson */ 3156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodsonpublic class UrlEscapeFunction implements TextFilter { 3256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 3356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson private final String encoding; 3456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 3556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson public UrlEscapeFunction(String encoding) { 3656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson try { 3756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson // Sanity check. Fail at construction time rather than render time. 3856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson new OutputStreamWriter(new ByteArrayOutputStream(), encoding); 3956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } catch (UnsupportedEncodingException e) { 4056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson throw new IllegalArgumentException("Unsupported encoding : " + encoding); 4156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 4256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson this.encoding = encoding; 4356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 4456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 4556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson @Override 4656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson public void filter(String in, Appendable out) throws IOException { 4756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson try { 4856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson out.append(URLEncoder.encode(in, encoding)); 4956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } catch (UnsupportedEncodingException e) { 5056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson // The sanity check in the constructor should have caught this. 5156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson // Things must be really broken for this to happen, so throw an Error. 5256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson throw new Error("Unsuported encoding : " + encoding); 5356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 5456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 5556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 5656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson} 57