full source of change

OutSupport.java (text/plain), 7.19 KB, created by Mike Skells on 2004-05-13 13:44:28 UTC

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Description: full source of change

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Creator: Mike Skells

Created: 2004-05-13 13:44:28 UTC

Size: 7.19 KB

patch

obsolete

>/* > * Copyright 1999-2004 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.taglibs.standard.tag.common.core; > >import java.io.IOException; >import java.io.Reader; > >import javax.servlet.jsp.JspException; >import javax.servlet.jsp.JspWriter; >import javax.servlet.jsp.PageContext; >import javax.servlet.jsp.tagext.BodyTagSupport; > >/** > * <p>Support for handlers of the &lt;out&gt; tag, which simply evalutes and > * prints the result of the expression it's passed. If the result is > * null, we print the value of the 'default' attribute's expression or > * our body (which two are mutually exclusive, although this constraint > * is enforced outside this handler, in our TagLibraryValidator).</p> > * > * @author Shawn Bayern > */ >public class OutSupport extends BodyTagSupport { > > /* > * (One almost wishes XML and JSP could support "anonymous tags," > * given the amount of trouble we had naming this one!) :-) - sb > */ > > //********************************************************************* > // Internal state > > protected Object value; // tag attribute > protected String def; // tag attribute > protected boolean escapeXml; // tag attribute > private boolean needBody; // non-space body needed? > > //********************************************************************* > // Construction and initialization > > /** > * Constructs a new handler. As with TagSupport, subclasses should > * not provide other constructors and are expected to call the > * superclass constructor. > */ > public OutSupport() { > super(); > init(); > } > > // resets local state > private void init() { > value = def = null; > escapeXml = true; > needBody = false; > } > > // Releases any resources we may have (or inherit) > public void release() { > super.release(); > init(); > } > > > //********************************************************************* > // Tag logic > > // evaluates 'value' and determines if the body should be evaluted > public int doStartTag() throws JspException { > > needBody = false; // reset state related to 'default' > this.bodyContent = null; // clean-up body (just in case container is pooling tag handlers) > > try { > // print value if available; otherwise, try 'default' > if (value != null) { > out(pageContext, escapeXml, value); > return SKIP_BODY; > } else { > // if we don't have a 'default' attribute, just go to the body > if (def == null) { > needBody = true; > return EVAL_BODY_BUFFERED; > } > > // if we do have 'default', print it > if (def != null) { > // good 'default' > out(pageContext, escapeXml, def); > } > return SKIP_BODY; > } > } catch (IOException ex) { > throw new JspException(ex.toString(), ex); > } > } > > // prints the body if necessary; reports errors > public int doEndTag() throws JspException { > try { > if (!needBody) > return EVAL_PAGE; // nothing more to do > > // trim and print out the body > if (bodyContent != null && bodyContent.getString() != null) > out(pageContext, escapeXml, bodyContent.getString().trim()); > return EVAL_PAGE; > } catch (IOException ex) { > throw new JspException(ex.toString(), ex); > } > } > > > //********************************************************************* > // Public utility methods > > /** > * Outputs <tt>text</tt> to <tt>pageContext</tt>'s current JspWriter. > * If <tt>escapeXml</tt> is true, performs the following substring > * replacements (to facilitate output to XML/HTML pages): > * > * & -> &amp; > * < -> &lt; > * > -> &gt; > * " -> &#034; > * ' -> &#039; > * > * See also Util.escapeXml(). > */ > public static void out(PageContext pageContext, > boolean escapeXml, > Object obj) throws IOException { > JspWriter w = pageContext.getOut(); > if (!escapeXml) { > // write chars as is > if (obj instanceof Reader) { > Reader reader = (Reader)obj; > char[] buf = new char[4096]; > int count; > while ((count=reader.read(buf, 0, 4096)) != -1) { > w.write(buf, 0, count); > } > } else { > w.write(obj.toString()); > } > } else { > // escape XML chars > if (obj instanceof Reader) { > Reader reader = (Reader)obj; > char[] buf = new char[4096]; > int count; > while ((count=reader.read(buf, 0, 4096)) != -1) { > writeEscaped(buf, count, w); > } > } else { > String text = obj.toString(); > int start = 0; > //cache the length, avoid to call to String.length() > int length = text.length(); > char[] buf = text.toCharArray(); > writeEscaped(buf,length,w); > } > } > } > private final static int HIGHEST_SPECIAL = '>'+1; > static char[][] specialCharactersRepresentation = new char[HIGHEST_SPECIAL][]; > static { > specialCharactersRepresentation['&'] = "&amp;".toCharArray(); > specialCharactersRepresentation['<'] = "&lt;".toCharArray(); > specialCharactersRepresentation['>'] = "&gt;".toCharArray(); > specialCharactersRepresentation['"'] = "&#034;".toCharArray(); > specialCharactersRepresentation['\''] = "&#039;".toCharArray(); > } > private static void writeEscaped(char[] buffer, int length, JspWriter w) throws IOException{ > int start = 0; > for (int i = 0; i < length; i++) { > char c = buffer[i]; > if (c <= HIGHEST_SPECIAL) { > char[] escaped = specialCharactersRepresentation[c]; > if (escaped != null) { > if (start < i) { > w.write(buffer,start,i-start); > } > start = i+1; > w.write(escaped); > } > } > } > if (start < length) { > w.write(buffer,start,length-start); > } > } >} View Attachment As Raw

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