adammurdoch 02/03/18 18:41:13
Added: proposal/myrmidon/src/java/org/apache/antlib/core
AbstractAvailableCondition.java
ClassAvailableCondition.java
ResourceAvailableCondition.java
Removed: proposal/myrmidon/src/java/org/apache/antlib/core
Available.java
Log:
Split <available> condition into <class-available> and <resource-available>.
Revision Changes Path
1.1
jakarta-ant/proposal/myrmidon/src/java/org/apache/antlib/core/AbstractAvailableCondition.java
Index: AbstractAvailableCondition.java
===================================================================
/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software License
* version 1.1, a copy of which has been included with this distribution in
* the LICENSE.txt file.
*/
package org.apache.antlib.core;
import org.apache.myrmidon.framework.conditions.Condition;
import org.apache.myrmidon.api.TaskException;
import org.apache.tools.todo.types.Path;
import org.apache.tools.todo.types.PathUtil;
import java.net.URL;
import java.net.URLClassLoader;
/**
* An abstract condition which checks for the availability of a particular
* resource in a classpath.
*
* @author <a href="mailto:[EMAIL PROTECTED]">Adam Murdoch</a>
* @version $Revision: 1.1 $ $Date: 2002/03/19 02:41:13 $
*/
public abstract class AbstractAvailableCondition
implements Condition
{
private Path m_classpath = new Path();
/**
* Adds a classpath element.
*/
public void addClasspath( final Path classpath )
throws TaskException
{
m_classpath.addPath( classpath );
}
/**
* Builds the ClassLoader to use to check resources.
*/
protected ClassLoader buildClassLoader() throws TaskException
{
final URL[] urls = PathUtil.toURLs( m_classpath );
final ClassLoader classLoader;
if( urls.length > 0 )
{
classLoader = new URLClassLoader( urls );
}
else
{
// TODO - using system classloader is kinda useless now, because
// the system classpath contains almost nothing. Should be using
// the 'common' classloader instead
classLoader = ClassLoader.getSystemClassLoader();
}
return classLoader;
}
}
1.1
jakarta-ant/proposal/myrmidon/src/java/org/apache/antlib/core/ClassAvailableCondition.java
Index: ClassAvailableCondition.java
===================================================================
/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software License
* version 1.1, a copy of which has been included with this distribution in
* the LICENSE.txt file.
*/
package org.apache.antlib.core;
import org.apache.myrmidon.api.TaskContext;
import org.apache.myrmidon.api.TaskException;
import org.apache.myrmidon.framework.conditions.Condition;
/**
* A condition that evaluates to true if the requested class is available
* at runtime.
*
* @author Stefano Mazzocchi <a href="mailto:[EMAIL PROTECTED]">
* [EMAIL PROTECTED]</a>
* @author <a href="mailto:[EMAIL PROTECTED]">Magesh Umasankar</a>
*
* @ant:type type="condition" name="class-available"
*/
public class ClassAvailableCondition
extends AbstractAvailableCondition
implements Condition
{
private String m_classname;
/**
* Sets the name of the class to search for.
*/
public void setClassname( final String classname )
{
m_classname = classname;
}
/**
* Evaluates the condition.
*/
public boolean evaluate( final TaskContext context )
throws TaskException
{
if( m_classname == null )
{
throw new TaskException( "Classname not specified." );
}
// Build the classloader to use to check resources
final ClassLoader classLoader = buildClassLoader();
// Do the check
try
{
classLoader.loadClass( m_classname );
return true;
}
catch( final Exception e )
{
return false;
}
}
}
1.1
jakarta-ant/proposal/myrmidon/src/java/org/apache/antlib/core/ResourceAvailableCondition.java
Index: ResourceAvailableCondition.java
===================================================================
/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software License
* version 1.1, a copy of which has been included with this distribution in
* the LICENSE.txt file.
*/
package org.apache.antlib.core;
import java.io.InputStream;
import org.apache.avalon.excalibur.io.IOUtil;
import org.apache.myrmidon.api.TaskContext;
import org.apache.myrmidon.api.TaskException;
import org.apache.myrmidon.framework.conditions.Condition;
/**
* A condition that evaluates to true if the requested resource is available
* at runtime.
*
* @author Stefano Mazzocchi <a href="mailto:[EMAIL PROTECTED]">
* [EMAIL PROTECTED]</a>
* @author <a href="mailto:[EMAIL PROTECTED]">Magesh Umasankar</a>
*
* @ant:type type="condition" name="resource-available"
*/
public class ResourceAvailableCondition
extends AbstractAvailableCondition
implements Condition
{
private String m_resource;
/**
* Sets the name of the resource to look for.
*/
public void setResource( final String resource )
{
m_resource = resource;
}
/**
* Evaluates the condition.
*/
public boolean evaluate( final TaskContext context )
throws TaskException
{
if( m_resource == null )
{
throw new TaskException( "Resource was not specified." );
}
// Check whether the resource is available
final ClassLoader classLoader = buildClassLoader();
final InputStream instr = classLoader.getResourceAsStream( m_resource
);
if( instr != null )
{
IOUtil.shutdownStream( instr );
return true;
}
return false;
}
}
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