| /******************************************************************************* |
| * 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 java.util.NoSuchElementException; |
| import org.eclipse.equinox.internal.p2.metadata.expression.*; |
| import org.eclipse.equinox.p2.metadata.expression.IEvaluationContext; |
| import org.eclipse.equinox.p2.ql.IQLExpression; |
| |
| /** |
| * An array of expressions |
| */ |
| final class Array extends NAry implements IQLConstants, IQLExpression { |
| final class ArrayIterator implements Iterator<Object> { |
| private final IEvaluationContext context; |
| |
| private int pos = -1; |
| |
| public ArrayIterator(IEvaluationContext context) { |
| this.context = context; |
| } |
| |
| public boolean hasNext() { |
| return pos + 1 < operands.length; |
| } |
| |
| public Object next() { |
| if (++pos >= operands.length) { |
| --pos; |
| throw new NoSuchElementException(); |
| } |
| return operands[pos].evaluate(context); |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| |
| Array(Expression[] operands) { |
| super(assertLength(operands, 0, OPERATOR_ARRAY)); |
| } |
| |
| public Object evaluate(IEvaluationContext context) { |
| return evaluateAsIterator(context); |
| } |
| |
| public Iterator<?> evaluateAsIterator(IEvaluationContext context) { |
| return new ArrayIterator(context); |
| } |
| |
| public int getExpressionType() { |
| return TYPE_ARRAY; |
| } |
| |
| public void toString(StringBuffer bld, Variable rootVariable) { |
| bld.append('['); |
| elementsToString(bld, rootVariable, operands); |
| bld.append(']'); |
| } |
| |
| public String getOperator() { |
| return OPERATOR_ARRAY; |
| } |
| |
| public int getPriority() { |
| return PRIORITY_FUNCTION; |
| } |
| } |