| /******************************************************************************* |
| * 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 java.util.Collection; |
| import org.eclipse.equinox.p2.metadata.expression.IEvaluationContext; |
| |
| /** |
| * Comparisons for magnitude. |
| */ |
| final class Compare extends Binary { |
| static IllegalArgumentException uncomparable(Object lval, Object rval) { |
| return new IllegalArgumentException("Cannot compare a " + lval.getClass().getName() + " to a " + rval.getClass().getName()); //$NON-NLS-1$//$NON-NLS-2$ |
| } |
| |
| final boolean compareLess; |
| |
| final boolean equalOK; |
| |
| Compare(Expression lhs, Expression rhs, boolean compareLess, boolean equalOK) { |
| super(lhs, rhs); |
| this.compareLess = compareLess; |
| this.equalOK = equalOK; |
| } |
| |
| public Object evaluate(IEvaluationContext context) { |
| Object lhsVal = lhs.evaluate(context); |
| Object rhsVal = rhs.evaluate(context); |
| |
| // Handle collections as per the OSGi LDAP spec |
| if (lhsVal instanceof Collection<?>) { |
| for (Object lhsItem : (Collection<?>) lhsVal) { |
| int cmpResult = CoercingComparator.coerceAndCompare(lhsItem, rhsVal); |
| |
| if (cmpResult == 0) { |
| return equalOK; |
| } |
| |
| if (cmpResult < 0 && compareLess) { |
| return true; |
| } |
| |
| if (!compareLess) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| int cmpResult = CoercingComparator.coerceAndCompare(lhsVal, rhsVal); |
| return Boolean.valueOf(cmpResult == 0 ? equalOK : (cmpResult < 0 ? compareLess : !compareLess)); |
| } |
| |
| public int getExpressionType() { |
| return compareLess ? (equalOK ? TYPE_LESS_EQUAL : TYPE_LESS) : (equalOK ? TYPE_GREATER_EQUAL : TYPE_GREATER); |
| } |
| |
| public String getOperator() { |
| return compareLess ? (equalOK ? OPERATOR_LT_EQUAL : OPERATOR_LT) : (equalOK ? OPERATOR_GT_EQUAL : OPERATOR_GT); |
| } |
| |
| public void toLDAPString(StringBuffer buf) { |
| if (!equalOK) |
| buf.append("(!"); //$NON-NLS-1$ |
| buf.append('('); |
| appendLDAPAttribute(buf); |
| if (equalOK) |
| buf.append(compareLess ? OPERATOR_LT_EQUAL : OPERATOR_GT_EQUAL); |
| else |
| buf.append(compareLess ? OPERATOR_GT_EQUAL : OPERATOR_LT_EQUAL); |
| appendLDAPValue(buf); |
| buf.append(')'); |
| if (!equalOK) |
| buf.append(')'); |
| } |
| } |