| /******************************************************************************* |
| * Copyright (c) 2009, 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 java.util.Iterator; |
| import org.eclipse.equinox.p2.metadata.expression.IEvaluationContext; |
| |
| /** |
| * An expression representing a variable stack in the current thread. |
| */ |
| public class Variable extends Expression { |
| |
| private final String name; |
| |
| public Variable(String name) { |
| this.name = name; |
| } |
| |
| public int compareTo(Expression e) { |
| int cmp = super.compareTo(e); |
| if (cmp == 0) |
| cmp = name.compareTo(((Variable) e).name); |
| return cmp; |
| } |
| |
| public boolean equals(Object o) { |
| return super.equals(o) && name.equals(((Variable) o).name); |
| } |
| |
| public final Object evaluate(IEvaluationContext context) { |
| return context.getValue(this); |
| } |
| |
| public Iterator<?> evaluateAsIterator(IEvaluationContext context) { |
| Object value = context.getValue(this); |
| if (value instanceof IRepeatableIterator<?>) |
| return ((IRepeatableIterator<?>) value).getCopy(); |
| |
| Iterator<?> itor = RepeatableIterator.create(value); |
| setValue(context, itor); |
| return itor; |
| } |
| |
| public int getExpressionType() { |
| return TYPE_VARIABLE; |
| } |
| |
| public String getName() { |
| return name; |
| } |
| |
| public String getOperator() { |
| return "<variable>"; //$NON-NLS-1$ |
| } |
| |
| public int getPriority() { |
| return PRIORITY_VARIABLE; |
| } |
| |
| public int hashCode() { |
| return name.hashCode(); |
| } |
| |
| public final void setValue(IEvaluationContext context, Object value) { |
| context.setValue(this, value); |
| } |
| |
| public void toString(StringBuffer bld, Variable rootVariable) { |
| bld.append(name); |
| } |
| |
| int countAccessToEverything() { |
| return this == ExpressionFactory.EVERYTHING ? 1 : 0; |
| } |
| } |