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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.gentools;
import java.io.PrintStream;
import java.util.TreeMap;
/**
* @author kpvdr
* Class to represent the <constant> declaration within the AMQP specification.
* Currently, only integer values exist within the specification, however looking forward
* to other possible types in the future, string and double types are also supported.
* <p/>
* The <constant> declaration in the specification contains only two attributes:
* name and value.
* <p/>
* The value of the constant is mapped against the version(s) for which the name is defined.
* This allows for a change in the value rather than the name only from one version to the next.
*/
@SuppressWarnings("serial")
public class AmqpConstant extends TreeMap<String, AmqpVersionSet>
implements Printable, VersionConsistencyCheck, Comparable<AmqpConstant>
{
/**
* Constant name as defined by the name attribute of the <constant> declaration.
*/
private final String _name;
/**
* Set of versions for which this constant name is defined.
*/
private final AmqpVersionSet _versionSet;
/**
* Constructor
*
* @param name Constant name as defined by the name attribute of the <constant> declaration.
* @param value Constant value as defined by the value attribute of the <constant> declaration.
* @param version AMQP version for which this constant is defined
*/
public AmqpConstant(String name, String value, AmqpVersion version)
{
_name = name;
_versionSet = new AmqpVersionSet(version);
AmqpVersionSet valueVersionSet = new AmqpVersionSet(version);
put(value, valueVersionSet);
}
/**
* Get the name of this constant.
*
* @return Name of this constant, being the name attribute of the <constant> declaration
* represented by this class.
*/
public String getName()
{
return _name;
}
/**
* Get the value of this constant as a String.
*
* @param version AMQP version for which this value is required.
* @return Value of this constant, being the value attribute of the <constant> declaration
* represented by this class.
* @throws AmqpTypeMappingException when a value is requested for a version for which it is not
* defined in the AMQP specifications.
*/
public String getStringValue(AmqpVersion version)
throws AmqpTypeMappingException
{
for (String thisValue : keySet())
{
AmqpVersionSet versionSet = get(thisValue);
if (versionSet.contains(version))
{
return thisValue;
}
}
throw new AmqpTypeMappingException("Unable to find value for constant \"" + getName() +
"\" for version " + version.toString() + ".");
}
/**
* Get the value of this constant as an integer.
*
* @param version AMQP version for which this value is required.
* @return Value of this constant, being the value attribute of the <constant> declaration
* represented by this class.
* @throws AmqpTypeMappingException when a value is requested for a version for which it is not
* defined in the AMQP specifications.
*/
public int getIntegerValue(AmqpVersion version)
throws AmqpTypeMappingException
{
return Integer.parseInt(getStringValue(version));
}
/**
* Get the value of this constant as a double.
*
* @param version AMQP version for which this value is required.
* @return Value of this constant, being the value attribute of the <constant> declaration
* represented by this class.
* @throws AmqpTypeMappingException when a value is requested for a version for which it is not
* defined in the AMQP specifications.
*/
public double getDoubleValue(AmqpVersion version)
throws AmqpTypeMappingException
{
return Double.parseDouble(getStringValue(version));
}
/**
* Get the version set for this constant. It contains the all the versions for which this
* constant name exists.
*
* @return Set of versions for which this constant exists.
*/
public AmqpVersionSet getVersionSet()
{
return _versionSet;
}
/* (non-Javadoc)
* @see java.lang.Comparable#compareTo(java.lang.Object)
*/
public int compareTo(AmqpConstant other)
{
int res = getName().compareTo(other.getName());
if (res != 0)
{
return res;
}
return getVersionSet().compareTo(other.getVersionSet());
}
/* (non-Javadoc)
* @see org.apache.qpid.gentools.VersionConsistencyCheck#isVersionConsistent(org.apache.qpid.gentools.AmqpVersionSet)
*/
public boolean isVersionConsistent(AmqpVersionSet globalVersionSet)
{
if (size() != 1)
{
return false;
}
return get(firstKey()).equals(globalVersionSet);
}
/* (non-Javadoc)
* @see org.apache.qpid.gentools.Printable#print(java.io.PrintStream, int, int)
*/
public void print(PrintStream out, int marginSize, int tabSize)
{
String margin = Utils.createSpaces(marginSize);
String tab = Utils.createSpaces(tabSize);
if (size() == 1)
{
out.println(margin + tab + "[C] " + getName() + " = \"" + firstKey() + "\" " + getVersionSet());
}
else
{
out.println(margin + tab + "[C] " + getName() + ": " + getVersionSet());
for (String thisValue : keySet())
{
out.println(margin + tab + tab + "= \"" + thisValue + "\" " + get(thisValue));
}
}
}
}
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