| /******************************************************************************* |
| * Copyright (c) 2009, 2017 Cloudsmith Inc. and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * Cloudsmith Inc. - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.equinox.internal.p2.metadata.expression; |
| |
| import java.util.*; |
| import org.eclipse.equinox.internal.p2.metadata.InstallableUnit; |
| import org.eclipse.equinox.internal.p2.metadata.expression.Member.DynamicMember; |
| import org.eclipse.equinox.p2.metadata.IInstallableUnit; |
| import org.eclipse.equinox.p2.metadata.expression.IEvaluationContext; |
| import org.eclipse.equinox.p2.metadata.index.IIndexProvider; |
| |
| /** |
| * This class represents indexed or keyed access to an indexed collection |
| * or a map. |
| */ |
| class At extends Binary { |
| protected At(Expression lhs, Expression rhs) { |
| super(lhs, rhs); |
| } |
| |
| @Override |
| public Object evaluate(org.eclipse.equinox.p2.metadata.expression.IEvaluationContext context) { |
| Object lval; |
| if (lhs instanceof DynamicMember) { |
| DynamicMember lm = (DynamicMember) lhs; |
| Object instance = lm.operand.evaluate(context); |
| if (instance instanceof IInstallableUnit) { |
| String name = lm.getName(); |
| if (InstallableUnit.MEMBER_TRANSLATED_PROPERTIES == name || InstallableUnit.MEMBER_PROFILE_PROPERTIES == name) { |
| IIndexProvider<?> indexProvider = context.getIndexProvider(); |
| if (indexProvider == null) |
| throw new UnsupportedOperationException("No managed properties available to QL"); //$NON-NLS-1$ |
| return indexProvider.getManagedProperty(instance, name, rhs.evaluate(context)); |
| } |
| if (InstallableUnit.MEMBER_PROPERTIES == name) { |
| // Avoid full copy of the properties map just to get one member |
| return ((IInstallableUnit) instance).getProperty((String) rhs.evaluate(context)); |
| } |
| } |
| lval = lm.invoke(instance); |
| } else |
| lval = lhs.evaluate(context); |
| |
| Object rval = rhs.evaluate(context); |
| if (lval == null) |
| throw new IllegalArgumentException("Unable to use [] on null"); //$NON-NLS-1$ |
| |
| if (lval instanceof Map<?, ?>) |
| return ((Map<?, ?>) lval).get(rval); |
| |
| if (rval instanceof Number) { |
| if (lval instanceof List<?>) |
| return ((List<?>) lval).get(((Number) rval).intValue()); |
| if (lval != null && lval.getClass().isArray()) |
| return ((Object[]) lval)[((Number) rval).intValue()]; |
| } |
| |
| if (lval instanceof Dictionary<?, ?>) |
| return ((Dictionary<?, ?>) lval).get(rval); |
| |
| throw new IllegalArgumentException("Unable to use [] on a " + lval.getClass().getName()); //$NON-NLS-1$ |
| } |
| |
| @Override |
| public Iterator<?> evaluateAsIterator(IEvaluationContext context) { |
| Object value = evaluate(context); |
| if (!(value instanceof Iterator<?>)) |
| value = RepeatableIterator.create(value); |
| return (Iterator<?>) value; |
| } |
| |
| @Override |
| public int getExpressionType() { |
| return TYPE_AT; |
| } |
| |
| @Override |
| public void toString(StringBuffer bld, Variable rootVariable) { |
| appendOperand(bld, rootVariable, lhs, getPriority()); |
| bld.append('['); |
| appendOperand(bld, rootVariable, rhs, PRIORITY_MAX); |
| bld.append(']'); |
| } |
| |
| @Override |
| public String getOperator() { |
| return OPERATOR_AT; |
| } |
| |
| @Override |
| public int getPriority() { |
| return PRIORITY_MEMBER; |
| } |
| } |