/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.cocoon.samples.flow.java;
import org.apache.cocoon.components.flow.java.AbstractContinuable;
import org.apache.cocoon.components.flow.java.VarMap;
public class CalculatorFlow extends AbstractContinuable {
private int count = 1;
public void doCalculator() {
float a = getNumber("a", 0f, 0f);
float b = getNumber("b", a, 0f);
String op = getOperator(a, b);
if (op.equals("plus")) {
sendResult(a, b, op, a + b);
} else if (op.equals("minus")) {
sendResult(a, b, op, a - b);
} else if (op.equals("multiply")) {
sendResult(a, b, op, a * b);
} else if (op.equals("divide")) {
if (b==0f)
sendMessage("Error: Cannot divide by zero!");
sendResult(a, b, op, a / b);
} else {
sendMessage("Error: Unkown operator!");
}
count++;
}
private float getNumber(String name, float a, float b) {
String uri = "page/calculator-" + name.toLowerCase();
sendPageAndWait(uri, new VarMap().add("a", a).add("b", b).add("count", count));
float value = 0f;
try {
value = Float.parseFloat(getRequest().getParameter(name));
} catch (NumberFormatException e) {
sendMessage("Error: \""+getRequest().getParameter(name)+"\" is not a correct number!");
}
return value;
}
private String getOperator(float a, float b) {
sendPageAndWait("page/calculator-operator", new VarMap().add("a", a).add("b", b).add("count", count));
return getRequest().getParameter("operator");
}
private void sendResult(float a, float b, String op, float result) {
sendPage("page/calculator-result", new VarMap().add("a", a).add("b", b).add("operator", op).add("result", result).add("count", count));
}
private void sendMessage(String message) {
sendPageAndWait("page/calculator-message", new VarMap().add("message", message).add("count", count));
}
}