package nabble.naml.compiler;

import java.util.Arrays;
import java.util.List;
import fschmidt.util.java.Interner;


public final class Usage {
	private final GenericNamespace[] base;
	private final List<Macro> macroPath;

	Usage(GenericNamespace[] base,List<Macro> macroPath) {
		this.base = base;
		this.macroPath = macroPath;
	}

	public String[] baseIds() {
		String[] a = new String[base.length];
		for( int i=0; i<base.length; i++ ) {
			a[i] = base[i].getId();
		}
		return a;
	}

	public List<Macro> macroPath() {
		return macroPath;
	}

	@Override public boolean equals(Object obj) {
		if( !(obj instanceof Usage) )
			return false;
		Usage t = (Usage)obj;
		return Arrays.equals(t.base,base) && t.macroPath.equals(macroPath);
	}

	@Override public int hashCode() {
		int hash = Arrays.hashCode(base);
		hash = 31*hash + macroPath.hashCode();
		return hash;
	}

	private static final Interner<Usage> interner = new Interner<Usage>();

	Usage intern() {
		return interner.intern(this);
	}

}