| /******************************************************************************* |
| * Copyright (c) 2009 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.ql.expression; |
| |
| import java.util.Iterator; |
| import org.eclipse.equinox.internal.p2.ql.*; |
| import org.eclipse.equinox.p2.ql.*; |
| |
| /** |
| * The context expression is the top expression in context queries. It introduces the |
| * variable 'everything' and initialized it with the iterator that represents all |
| * available items. |
| */ |
| final class ContextExpression extends Unary implements IContextExpression { |
| |
| ContextExpression(Expression expression) { |
| super(expression); |
| } |
| |
| public void toString(StringBuffer bld) { |
| operand.toString(bld); |
| } |
| |
| public IEvaluationContext createContext(Class elementClass, Iterator iterator, Object[] params) { |
| IEvaluationContext context = new SingleVariableContext(new ParameterContext(params), Variable.EVERYTHING); |
| context.setValue(Variable.EVERYTHING, new Everything(elementClass, iterator, operand.needsRepeatedIterations())); |
| return context; |
| } |
| |
| public IEvaluationContext createContext(Class elementClass, Iterator iterator, Object[] params, ITranslationSupport ts) { |
| IEvaluationContext context = new MultiVariableContext(new ParameterContext(params), new IExpression[] {Variable.EVERYTHING, Variable.TRANSLATIONS}); |
| context.setValue(Variable.EVERYTHING, new Everything(elementClass, iterator, operand.needsRepeatedIterations())); |
| context.setValue(Variable.TRANSLATIONS, ts); |
| return context; |
| } |
| |
| public int getExpressionType() { |
| return operand.getExpressionType(); |
| } |
| |
| String getOperator() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| int getPriority() { |
| return operand.getPriority(); |
| } |
| |
| Expression pipeFrom(Expression expr) { |
| return new ContextExpression(operand.pipeFrom(expr)); |
| } |
| |
| boolean isBoolean() { |
| return operand.isBoolean(); |
| } |
| |
| boolean isCollection() { |
| return operand.isCollection(); |
| } |
| } |