001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * Portions Copyright Apache Software Foundation.
007: *
008: * The contents of this file are subject to the terms of either the GNU
009: * General Public License Version 2 only ("GPL") or the Common Development
010: * and Distribution License("CDDL") (collectively, the "License"). You
011: * may not use this file except in compliance with the License. You can obtain
012: * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
013: * or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
014: * language governing permissions and limitations under the License.
015: *
016: * When distributing the software, include this License Header Notice in each
017: * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
018: * Sun designates this particular file as subject to the "Classpath" exception
019: * as provided by Sun in the GPL Version 2 section of the License file that
020: * accompanied this code. If applicable, add the following below the License
021: * Header, with the fields enclosed by brackets [] replaced by your own
022: * identifying information: "Portions Copyrighted [year]
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024: *
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026: *
027: * If you wish your version of this file to be governed by only the CDDL or
028: * only the GPL Version 2, indicate your decision by adding "[Contributor]
029: * elects to include this software in this distribution under the [CDDL or GPL
030: * Version 2] license." If you don't indicate a single choice of license, a
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032: * either the CDDL, the GPL Version 2 or to extend the choice of license to
033: * its licensees as provided above. However, if you add GPL Version 2 code
034: * and therefore, elected the GPL Version 2 license, then the option applies
035: * only if the new code is made subject to such option by the copyright
036: * holder.
037: */
038:
039: package org.apache.taglibs.standard.tag.el.core;
040:
041: import javax.servlet.jsp.JspException;
042:
043: import org.apache.taglibs.standard.tag.common.core.NullAttributeException;
044: import org.apache.taglibs.standard.tag.common.core.OutSupport;
045:
046: /**
047: * <p>A handler for <out>, which redirects the browser to a
048: * new URL.
049: *
050: * @author Shawn Bayern
051: */
052:
053: public class OutTag extends OutSupport {
054:
055: //*********************************************************************
056: // 'Private' state (implementation details)
057:
058: private String value_; // stores EL-based property
059: private String default_; // stores EL-based property
060: private String escapeXml_; // stores EL-based property
061:
062: //*********************************************************************
063: // Constructor
064:
065: public OutTag() {
066: super ();
067: init();
068: }
069:
070: //*********************************************************************
071: // Tag logic
072:
073: // evaluates expression and chains to parent
074: public int doStartTag() throws JspException {
075:
076: // evaluate any expressions we were passed, once per invocation
077: evaluateExpressions();
078:
079: // chain to the parent implementation
080: return super .doStartTag();
081: }
082:
083: // Releases any resources we may have (or inherit)
084: public void release() {
085: super .release();
086: init();
087: }
088:
089: //*********************************************************************
090: // Accessor methods
091:
092: public void setValue(String value_) {
093: this .value_ = value_;
094: }
095:
096: public void setDefault(String default_) {
097: this .default_ = default_;
098: }
099:
100: public void setEscapeXml(String escapeXml_) {
101: this .escapeXml_ = escapeXml_;
102: }
103:
104: //*********************************************************************
105: // Private (utility) methods
106:
107: // (re)initializes state (during release() or construction)
108: private void init() {
109: // null implies "no expression"
110: value_ = default_ = escapeXml_ = null;
111: }
112:
113: /* Evaluates expressions as necessary */
114: private void evaluateExpressions() throws JspException {
115: try {
116: value = ExpressionUtil.evalNotNull("out", "value", value_,
117: Object.class, this , pageContext);
118: } catch (NullAttributeException ex) {
119: // explicitly allow 'null' for value
120: value = null;
121: }
122: try {
123: def = (String) ExpressionUtil.evalNotNull("out", "default",
124: default_, String.class, this , pageContext);
125: } catch (NullAttributeException ex) {
126: // explicitly allow 'null' for def
127: def = null;
128: }
129: escapeXml = true;
130: Boolean escape = ((Boolean) ExpressionUtil.evalNotNull("out",
131: "escapeXml", escapeXml_, Boolean.class, this,
132: pageContext));
133: if (escape != null)
134: escapeXml = escape.booleanValue();
135: }
136: }
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