mpo 2003/08/29 15:22:05
Added: src/blocks/apples/samples/calc getNumberA.xsp
getOperator.xsp getNumberB.xsp displayResult.xsp
src/blocks/apples/java/org/apache/cocoon/components/flow/apples/samples
CalculationApple.java
Log:
Adding Calculator Example showing difference between Apples and FlowScript.
Revision Changes Path
1.1 cocoon-2.1/src/blocks/apples/samples/calc/getNumberA.xsp
Index: getNumberA.xsp
===================================================================
<?xml version="1.0"?>
<!--+
| CVS: $Id: getNumberA.xsp,v 1.1 2003/08/29 22:22:05 mpo Exp $
| Author: Ovidiu Predescu "[EMAIL PROTECTED]"
| Date: March 23, 2002
+-->
<xsp:page language="java"
xmlns:xsp="http://apache.org/xsp";
xmlns:jpath="http://apache.org/xsp/jpath/1.0";>
<page>
<title>Calculator</title>
<content>
<para>
This sample is explicitely designed to provide an easy comparison grounds
against the same kind of application in flowScript. (check the Calculator
sample there too)
</para>
<para>
You should note especially how they handle continuation after pressing
the back-button. That should also explain why this approach chooses to
provide links to explicitely edit the previsouly entered values.
</para>
<form method="post">
<xsp:attribute
name="action"><xsp:expr><jpath:continuation/>+".continue"</xsp:expr></xsp:attribute>
<para>Enter value of <strong>a</strong>: <input type="text" name="a"/></para>
<input type="submit" name="submit" value="Enter"/>
</form>
</content>
</page>
</xsp:page>
1.1 cocoon-2.1/src/blocks/apples/samples/calc/getOperator.xsp
Index: getOperator.xsp
===================================================================
<?xml version="1.0"?>
<!--+
| CVS: $Id: getOperator.xsp,v 1.1 2003/08/29 22:22:05 mpo Exp $
| Author: Ovidiu Predescu "[EMAIL PROTECTED]"
| Date: March 23, 2002
+-->
<xsp:page language="java"
xmlns:xsp="http://apache.org/xsp";
xmlns:jpath="http://apache.org/xsp/jpath/1.0";>
<page>
<title>Calculator</title>
<content>
<form method="post">
<xsp:attribute name="action"><xsp:expr><jpath:continuation/>+
".continue"</xsp:expr></xsp:attribute>
<para>a =
<a>
<xsp:attribute
name="href"><xsp:expr><jpath:continuation/>+".continue?change=a"</xsp:expr></xsp:attribute>
<strong><jpath:value-of select="a"/></strong>
</a>
</para>
<para>b =
<a>
<xsp:attribute
name="href"><xsp:expr><jpath:continuation/>+".continue?change=b"</xsp:expr></xsp:attribute>
<strong><jpath:value-of select="b"/></strong>
</a>
</para>
<para>Enter operator
<select name="operator">
<option>plus</option>
<option>minus</option>
<option>multiply</option>
<option>divide</option>
</select>
</para>
<input type="submit" name="submit" value="Do it!"/>
</form>
</content>
</page>
</xsp:page>
1.1 cocoon-2.1/src/blocks/apples/samples/calc/getNumberB.xsp
Index: getNumberB.xsp
===================================================================
<?xml version="1.0"?>
<!--+
| CVS: $Id: getNumberB.xsp,v 1.1 2003/08/29 22:22:05 mpo Exp $
| Author: Ovidiu Predescu "[EMAIL PROTECTED]"
| Date: March 23, 2002
+-->
<xsp:page language="java"
xmlns:xsp="http://apache.org/xsp";
xmlns:jpath="http://apache.org/xsp/jpath/1.0";>
<page>
<title>Calculator</title>
<content>
<form method="post">
<xsp:attribute
name="action"><xsp:expr><jpath:continuation/>+".continue"</xsp:expr></xsp:attribute>
<para>a =
<a>
<xsp:attribute
name="href"><xsp:expr><jpath:continuation/>+".continue?change=a"</xsp:expr></xsp:attribute>
<strong><jpath:value-of select="a"/></strong>
</a>
</para>
<para>Enter value of <strong>b</strong>: <input type="text" name="b"/></para>
<input type="submit" name="submit" value="Enter"/>
</form>
</content>
</page>
</xsp:page>
1.1 cocoon-2.1/src/blocks/apples/samples/calc/displayResult.xsp
Index: displayResult.xsp
===================================================================
<?xml version="1.0"?>
<!--+
| CVS: $Id: displayResult.xsp,v 1.1 2003/08/29 22:22:05 mpo Exp $
| Author: Ovidiu Predescu "[EMAIL PROTECTED]"
| Date: March 23, 2002
+-->
<xsp:page language="java"
xmlns:xsp="http://apache.org/xsp";
xmlns:jpath="http://apache.org/xsp/jpath/1.0";>
<page>
<title>Calculator</title>
<content>
<form action="./calc.flow" method="post">
<para>a =
<a>
<xsp:attribute
name="href"><xsp:expr><jpath:continuation/>+".continue?change=NumberA"</xsp:expr></xsp:attribute>
<strong><jpath:value-of select="a"/></strong>
</a>
</para>
<para>b =
<a>
<xsp:attribute
name="href"><xsp:expr><jpath:continuation/>+".continue?change=NumberB"</xsp:expr></xsp:attribute>
<strong><jpath:value-of select="b"/></strong>
</a>
</para>
<para>Operator =
<a>
<xsp:attribute
name="href"><xsp:expr><jpath:continuation/>+".continue?change=Operator"</xsp:expr></xsp:attribute>
<strong><jpath:value-of select="operator"/></strong>
</a>
</para>
<para>Result = <strong><jpath:value-of select="result"/></strong></para>
<input type="submit" name="submit" value="Start over"/>
</form>
</content>
</page>
</xsp:page>
1.1
cocoon-2.1/src/blocks/apples/java/org/apache/cocoon/components/flow/apples/samples/CalculationApple.java
Index: CalculationApple.java
===================================================================
/*
============================================================================
The Apache Software License, Version 1.1
============================================================================
Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
Redistribution and use in source and binary forms, with or without modifica-
tion, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
3. The end-user documentation included with the redistribution, if any, must
include the following acknowledgment: "This product includes software
developed by the Apache Software Foundation (http://www.apache.org/)."
Alternately, this acknowledgment may appear in the software itself, if
and wherever such third-party acknowledgments normally appear.
4. The names "Apache Cocoon" and "Apache Software Foundation" must not be
used to endorse or promote products derived from this software without
prior written permission. For written permission, please contact
[EMAIL PROTECTED]
5. Products derived from this software may not be called "Apache", nor may
"Apache" appear in their name, without prior written permission of the
Apache Software Foundation.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.apache.cocoon.components.flow.apples.samples;
import java.math.BigDecimal;
import java.util.HashMap;
import java.util.Map;
import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.cocoon.ProcessingException;
import org.apache.cocoon.components.flow.apples.AppleController;
import org.apache.cocoon.components.flow.apples.AppleRequest;
import org.apache.cocoon.components.flow.apples.AppleResponse;
/**
* CalculationApple shows an easy Apple example implementation for a Calculator.
* <p>
* It is explicitely designed to show the difference with flowscript by
* remembering the 'lookahead' information from the previous path that entered
* already the other data.
* <p>
* In other words this shows that Apples are not building a complete tree of
* continuations like flowscript is doing. But the initial argument of course was
* that some cases simply don't need it.
*/
public class CalculationApple extends AbstractLogEnabled implements AppleController {
BigDecimal inputA;
BigDecimal inputB;
String inputOp;
BigDecimal output;
public String toString() {
return "CalculationApple[ a=" + this.inputA + " | b=" + this.inputB
+ " | op = " + this.inputOp + " | result = " + this.output + "]";
}
public void process(AppleRequest req, AppleResponse res) throws
ProcessingException {
String changeTo = processRequest(req);
getLogger().debug(toString());
showNextState(res, changeTo);
}
private String processRequest(AppleRequest req) {
String changeRequest = req.getCocoonRequest().getParameter("change");
String newA = req.getCocoonRequest().getParameter("a");
if (newA != null) {
this.inputA = new BigDecimal(newA);
// explicitely do not set inputB and inputOp to null !
}
String newB = req.getCocoonRequest().getParameter("b");
if (newB != null) {
this.inputB = new BigDecimal(newB);
// explicitely do not set inputOp to null !
}
String newOp = req.getCocoonRequest().getParameter("operator");
if (newOp != null) {
this.inputOp = newOp;
}
//explicitely always do the calculation
calculate();
return changeRequest;
}
private void calculate() {
if("plus".equals(this.inputOp)) {
this.output = this.inputA.add(this.inputB);
} else if("minus".equals(this.inputOp)) {
this.output = this.inputA.add(this.inputB.negate());
} else if("multiply".equals(this.inputOp)) {
this.output = this.inputA.multiply(this.inputB);
} else if("divide".equals(this.inputOp)) {
this.output = this.inputA.divide(this.inputB,
BigDecimal.ROUND_HALF_EVEN);
} else { //not a valid operator
this.output = null;
}
}
private void showNextState(AppleResponse res, String changeTo) {
Object bizdata = buildBizData();
//TODO: this simple example is obviously subject to some serious hacking
// by URL-hacking/adding a ?change one could damage the flow!
if (changeTo != null) {
res.sendPage("calc/get" + changeTo, bizdata);
} else if (this.inputA == null) {
res.sendPage("calc/getNumberA", null);
} else if (this.inputB == null) {
res.sendPage("calc/getNumberB", bizdata);
} else if (this.inputOp == null) {
res.sendPage("calc/getOperator", bizdata);
} else {
res.sendPage("calc/displayResult", bizdata);
}
}
private Object buildBizData() {
Map bizdata = new HashMap();
bizdata.put("a", this.inputA);
bizdata.put("b", this.inputB);
bizdata.put("operator", this.inputOp);
bizdata.put("result", this.output);
return bizdata;
}
}
