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: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common
008: * Development and Distribution License("CDDL") (collectively, the
009: * "License"). You may not use this file except in compliance with the
010: * License. You can obtain a copy of the License at
011: * http://www.netbeans.org/cddl-gplv2.html
012: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013: * specific language governing permissions and limitations under the
014: * License. When distributing the software, include this License Header
015: * Notice in each file and include the License file at
016: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
017: * particular file as subject to the "Classpath" exception as provided
018: * by Sun in the GPL Version 2 section of the License file that
019: * accompanied this code. If applicable, add the following below the
020: * License Header, with the fields enclosed by brackets [] replaced by
021: * your own identifying information:
022: * "Portions Copyrighted [year] [name of copyright owner]"
023: *
024: * Contributor(s):
025: *
026: * The Original Software is NetBeans. The Initial Developer of the Original
027: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun
028: * Microsystems, Inc. All Rights Reserved.
029: *
030: * If you wish your version of this file to be governed by only the CDDL
031: * or only the GPL Version 2, indicate your decision by adding
032: * "[Contributor] elects to include this software in this distribution
033: * under the [CDDL or GPL Version 2] license." If you do not indicate a
034: * single choice of license, a recipient has the option to distribute
035: * your version of this file under either the CDDL, the GPL Version 2 or
036: * to extend the choice of license to its licensees as provided above.
037: * However, if you add GPL Version 2 code and therefore, elected the GPL
038: * Version 2 license, then the option applies only if the new code is
039: * made subject to such option by the copyright holder.
040: */
041: package com.sun.rave.web.ui.el;
042:
043: import javax.faces.component.StateHolder;
044: import javax.faces.context.FacesContext;
045: import javax.faces.el.MethodBinding;
046:
047: /**
048: * <p>Implementation of <code>MethodBinding</code> that always returns
049: * the value specified to our constructor.</p>
050: */
051: public class ConstantMethodBinding extends MethodBinding implements
052: StateHolder {
053:
054: // ------------------------------------------------------------ Constructors
055:
056: /**
057: * <p>Zero arguments constructor for restoring state.</p>
058: */
059: public ConstantMethodBinding() {
060: this (null);
061: }
062:
063: /**
064: * <p>Create a new <code>MethodBinding</code> that always returns
065: * the specified value.</p>
066: */
067: public ConstantMethodBinding(String value) {
068: this .value = value;
069: }
070:
071: // ------------------------------------------------------ Instance Variables
072:
073: /**
074: * <p>The value to be returned when this method binding is
075: * evaluated.</p>
076: */
077: private String value = null;
078:
079: // --------------------------------------------------- MethodBinding Methods
080:
081: /**
082: * <p>Return the appropriate constant value.</p>
083: *
084: * @param context <code>FacesContext</code> for this request
085: * @param params Method parameters to pass in
086: */
087: public Object invoke(FacesContext context, Object params[]) {
088: return value;
089: }
090:
091: /**
092: * <p>Return the expected return type class.</p>
093: *
094: * @param context <code>FacesContext</code> for this request
095: */
096: public Class getType(FacesContext context) {
097: return String.class;
098: }
099:
100: /**
101: * <p>Return the expression string for this method binding.</p>
102: */
103: public String getExpressionString() {
104: return this .value;
105: }
106:
107: // ----------------------------------------------------- StateHolder Methods
108:
109: private boolean transientFlag = false;
110:
111: public boolean isTransient() {
112: return this .transientFlag;
113: }
114:
115: public void setTransient(boolean transientFlag) {
116: this .transientFlag = transientFlag;
117: }
118:
119: public void restoreState(FacesContext context, Object state) {
120: this .value = (String) state;
121: }
122:
123: public Object saveState(FacesContext context) {
124: return this.value;
125: }
126:
127: }
|