/* Copyright (c) 2010, Carl Burch. License information is located in the
* com.cburch.logisim.Main source code and at www.cburch.com/logisim/. */
package com.cburch.logisim.std.gates;
import java.util.AbstractList;
import com.cburch.logisim.data.Attribute;
import com.cburch.logisim.data.Direction;
import com.cburch.logisim.instance.StdAttr;
class GateAttributeList extends AbstractList<Attribute<?>> {
private static final Attribute<?>[] BASE_ATTRIBUTES = {
StdAttr.FACING, StdAttr.WIDTH,
GateAttributes.ATTR_SIZE, GateAttributes.ATTR_INPUTS,
GateAttributes.ATTR_OUTPUT, StdAttr.LABEL, StdAttr.LABEL_FONT,
};
private GateAttributes attrs;
public GateAttributeList(GateAttributes attrs) {
this.attrs = attrs;
}
@Override
public Attribute<?> get(int index) {
int len = BASE_ATTRIBUTES.length;
if (index < len) {
return BASE_ATTRIBUTES[index];
}
index -= len;
if (attrs.xorBehave != null) {
index--;
if (index < 0) return GateAttributes.ATTR_XOR;
}
Direction facing = attrs.facing;
int inputs = attrs.inputs;
if (index == 0) {
if (facing == Direction.EAST || facing == Direction.WEST) {
return new NegateAttribute(index, Direction.NORTH);
} else {
return new NegateAttribute(index, Direction.WEST);
}
} else if (index == inputs - 1) {
if (facing == Direction.EAST || facing == Direction.WEST) {
return new NegateAttribute(index, Direction.SOUTH);
} else {
return new NegateAttribute(index, Direction.EAST);
}
} else if (index < inputs) {
return new NegateAttribute(index, null);
}
return null;
}
@Override
public int size() {
int ret = BASE_ATTRIBUTES.length;
if (attrs.xorBehave != null) ret++;
ret += attrs.inputs;
return ret;
}
}