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Java Artificial Life Simulation Engine
There is a newer version: 1.1.0
package jalse.attributes;

import java.util.Collections;
import java.util.Set;
import java.util.stream.Stream;

class UnmodifiableDelegateAttributeContainer implements AttributeContainer {

    private final AttributeContainer delegate;

    UnmodifiableDelegateAttributeContainer(final AttributeContainer delegate) {
	this.delegate = delegate;
    }

    @Override
    public  boolean addAttributeListener(final String name, final AttributeType type,
	    final AttributeListener listener) {
	throw new UnsupportedOperationException();
    }

    @Override
    public  void fireAttributeChanged(final String name, final AttributeType type) {
	throw new UnsupportedOperationException();
    }

    @Override
    public  T getAttribute(final String name, final AttributeType type) {
	return delegate != null ? delegate.getAttribute(name, type) : null;
    }

    @Override
    public int getAttributeCount() {
	return delegate != null ? delegate.getAttributeCount() : 0;
    }

    @Override
    public Set getAttributeListenerNames() {
	return delegate != null ? delegate.getAttributeListenerNames() : Collections.emptySet();
    }

    @Override
    public  Set> getAttributeListeners(final String name, final AttributeType type) {
	return delegate != null ? delegate.getAttributeListeners(name, type) : Collections.emptySet();
    }

    @Override
    public Set> getAttributeListenerTypes(final String name) {
	return delegate != null ? delegate.getAttributeListenerTypes(name) : Collections.emptySet();
    }

    @Override
    public Set getAttributeNames() {
	return delegate != null ? delegate.getAttributeNames() : Collections.emptySet();
    }

    @Override
    public Set getAttributes() {
	return delegate != null ? delegate.getAttributes() : Collections.emptySet();
    }

    @Override
    public Set> getAttributeTypes(final String name) {
	return delegate != null ? delegate.getAttributeTypes(name) : Collections.emptySet();
    }

    @Override
    public  T removeAttribute(final String name, final AttributeType type) {
	throw new UnsupportedOperationException();
    }

    @Override
    public  boolean removeAttributeListener(final String name, final AttributeType type,
	    final AttributeListener listener) {
	throw new UnsupportedOperationException();
    }

    @Override
    public void removeAttributeListeners() {
	throw new UnsupportedOperationException();
    }

    @Override
    public  void removeAttributeListeners(final String name, final AttributeType type) {
	throw new UnsupportedOperationException();
    }

    @Override
    public void removeAttributes() {
	throw new UnsupportedOperationException();
    }

    @Override
    public  T setAttribute(final String name, final AttributeType type, final T attr) {
	throw new UnsupportedOperationException();
    }

    @Override
    public Stream streamAttributes() {
	return delegate != null ? delegate.streamAttributes() : Stream.empty();
    }
}