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/*
*
* Copyright (c) 2006 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.qpid.tasks;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import java.util.HashSet;
import java.util.Set;
/**
* BaseTask -- an abstract base task for blaze specific tasks.
**/
public abstract class BaseTask extends Task {
private static Set EMPTY = new HashSet();
{
EMPTY.add(0);
EMPTY.add("");
}
public static class Validator {
private String name;
private Object value;
private Validator(String name, Object value) {
this.name = name;
this.value = value;
}
public Validator required() {
if (value == null) {
error("value is required");
}
return this;
}
public Validator nonempty() {
if (EMPTY.contains(value)) {
error("value is empty");
}
return this;
}
private void error(String msg) {
throw new BuildException(name + ": " + msg);
}
}
public Validator validate(String name, Object value) {
return new Validator(name, value);
}
}
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