[qemu] Add filtering/transformation of config files and VM management

1 files changed, 80 insertions, 0 deletions

diff --git a/core/modules/qemu/runvirt-plugin-qemu/src/main/java/org/openslx/runvirt/configuration/FilterManager.java b/core/modules/qemu/runvirt-plugin-qemu/src/main/java/org/openslx/runvirt/configuration/FilterManager.java
new file mode 100644
index 00000000..a97ad6d1
--- /dev/null
+++ b/core/modules/qemu/runvirt-plugin-qemu/src/main/java/org/openslx/runvirt/configuration/FilterManager.java
@@ -0,0 +1,80 @@
+package org.openslx.runvirt.configuration;
+
+import java.util.ArrayList;
+
+public final class FilterManager<T, R>
+{
+	private ArrayList<Filter<T, R>> filters;
+	private T config;
+	private R args;
+
+	public FilterManager( T config, R args )
+	{
+		this.filters = new ArrayList<Filter<T, R>>();
+		this.config = config;
+		this.args = args;
+	}
+
+	public void register( Filter<T, R> filter )
+	{
+		this.register( filter, true );
+	}
+
+	public void register( Filter<T, R> filter, boolean enabled )
+	{
+		filter.setEnabled( enabled );
+		this.filters.add( filter );
+	}
+
+	public void register( String name, FilterFunction<T, R> filterFunction )
+	{
+		this.register( name, filterFunction, true );
+	}
+
+	public void register( String name, FilterFunction<T, R> filterFunction, boolean enabled )
+	{
+		final Filter<T, R> filter = new Filter<T, R>( name ) {
+			@Override
+			public void filter( T document, R args ) throws FilterException
+			{
+				filterFunction.apply( document, args );
+			}
+		};
+
+		filter.setEnabled( enabled );
+		this.filters.add( filter );
+	}
+
+	public void filterAll() throws FilterException
+	{
+		for ( Filter<T, R> filter : this.filters ) {
+			try {
+				filter.apply( this.config, this.args );
+			} catch ( FilterException e ) {
+				final String errorMsg = new String(
+						"Error in configuration filter '" + filter.getName() + "':" + e.getLocalizedMessage() );
+				throw new FilterException( errorMsg );
+			}
+		}
+	}
+
+	private String showFilters()
+	{
+		String filterSummary = new String();
+		final int maxFilterNumCharacters = ( this.filters.size() + 1 ) / 10;
+
+		for ( int i = 0; i < this.filters.size(); i++ ) {
+			final Filter<T, R> filter = this.filters.get( i );
+			final String paddedNumber = String.format( "%-" + maxFilterNumCharacters + "s", i + 1 );
+			filterSummary += paddedNumber + ": " + filter.getName() + System.lineSeparator();
+		}
+
+		return filterSummary;
+	}
+
+	@Override
+	public String toString()
+	{
+		return this.showFilters();
+	}
+}