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/*
*
* 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.qpid.server.model;
public abstract class Attribute<C extends ConfiguredObject, T>
{
private final String _name;
public Attribute(String name)
{
_name = name;
}
public String getName()
{
return _name;
}
abstract public Class<T> getType();
public T getValue(C configuredObject)
{
Object o = configuredObject.getAttribute(_name);
if(getType().isInstance(o))
{
return (T) o;
}
return null;
}
public T setValue(T expected, T desired, C configuredObject)
{
return (T) configuredObject.setAttribute(_name, expected, desired);
}
abstract public T setValue(String stringValue, C configuredObject);
static class StringAttribute<C extends ConfiguredObject> extends Attribute<C, String>
{
public StringAttribute(String name)
{
super(name);
}
@Override
public Class<String> getType()
{
return String.class;
}
@Override
public String setValue(String stringValue, C configuredObject)
{
return setValue(getValue(configuredObject), stringValue, configuredObject);
}
}
static class IntegerAttribute<C extends ConfiguredObject> extends Attribute<C, Integer>
{
public IntegerAttribute(String name)
{
super(name);
}
@Override
public Class<Integer> getType()
{
return Integer.class;
}
@Override
public Integer setValue(String stringValue, C configuredObject)
{
try
{
Integer val = Integer.valueOf(stringValue);
return setValue(getValue(configuredObject), val, configuredObject);
}
catch (NumberFormatException e)
{
throw new IllegalArgumentException(e);
}
}
}
static class LongAttribute<C extends ConfiguredObject> extends Attribute<C, Long>
{
public LongAttribute(String name)
{
super(name);
}
@Override
public Class<Long> getType()
{
return Long.class;
}
@Override
public Long setValue(String stringValue, C configuredObject)
{
try
{
Long val = Long.valueOf(stringValue);
return setValue(getValue(configuredObject), val, configuredObject);
}
catch (NumberFormatException e)
{
throw new IllegalArgumentException(e);
}
}
}
static class DoubleAttribute<C extends ConfiguredObject> extends Attribute<C, Double>
{
public DoubleAttribute(String name)
{
super(name);
}
@Override
public Class<Double> getType()
{
return Double.class;
}
@Override
public Double setValue(String stringValue, C configuredObject)
{
try
{
Double val = Double.valueOf(stringValue);
return setValue(getValue(configuredObject), val, configuredObject);
}
catch (NumberFormatException e)
{
throw new IllegalArgumentException(e);
}
}
}
static class FloatAttribute<C extends ConfiguredObject> extends Attribute<C, Float>
{
public FloatAttribute(String name)
{
super(name);
}
@Override
public Class<Float> getType()
{
return Float.class;
}
@Override
public Float setValue(String stringValue, C configuredObject)
{
try
{
Float val = Float.valueOf(stringValue);
return setValue(getValue(configuredObject), val, configuredObject);
}
catch (NumberFormatException e)
{
throw new IllegalArgumentException(e);
}
}
}
}
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