1 files changed, 59 insertions, 0 deletions
diff --git a/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/internal/p2/metadata/expression/NAry.java b/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/internal/p2/metadata/expression/NAry.java
new file mode 100644
index 000000000..805cff2ab
--- /dev/null
+++ b/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/internal/p2/metadata/expression/NAry.java
@@ -0,0 +1,59 @@
+/*******************************************************************************
+ * Copyright (c) 2010 Cloudsmith Inc. and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Cloudsmith Inc. - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.equinox.internal.p2.metadata.expression;
+
+import org.eclipse.equinox.p2.metadata.expression.IExpressionVisitor;
+
+/**
+ * The abstract baseclass for all N-ary expressions
+ */
+public abstract class NAry extends Expression {
+	public final Expression[] operands;
+
+	protected NAry(Expression[] operands) {
+		this.operands = operands;
+	}
+
+	public boolean accept(IExpressionVisitor visitor) {
+		if (super.accept(visitor))
+			for (int idx = 0; idx < operands.length; ++idx)
+				if (!operands[idx].accept(visitor))
+					return false;
+		return true;
+	}
+
+	public int compareTo(Expression e) {
+		int cmp = super.compareTo(e);
+		if (cmp == 0)
+			cmp = compare(operands, ((NAry) e).operands);
+		return cmp;
+	}
+
+	public boolean equals(Object o) {
+		return super.equals(o) && equals(operands, ((NAry) o).operands);
+	}
+
+	public abstract String getOperator();
+
+	public int hashCode() {
+		return hashCode(operands);
+	}
+
+	public void toString(StringBuffer bld, Variable rootVariable) {
+		appendOperand(bld, rootVariable, operands[0], getPriority());
+		for (int idx = 1; idx < operands.length; ++idx) {
+			bld.append(' ');
+			bld.append(getOperator());
+			bld.append(' ');
+			appendOperand(bld, rootVariable, operands[idx], getPriority());
+		}
+	}
+}