001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018package org.apache.commons.jxpath.ri.compiler; 019 020import org.apache.commons.jxpath.ri.EvalContext; 021import org.apache.commons.jxpath.ri.axes.UnionContext; 022 023/** 024 * Implementation of {@link Expression} for the operation "|". 025 */ 026public class CoreOperationUnion extends CoreOperation { 027 028 /** 029 * Constructs a new CoreOperationUnion. 030 * 031 * @param args Expression[] 032 */ 033 public CoreOperationUnion(final Expression[] args) { 034 super(args); 035 } 036 037 @Override 038 public Object computeValue(final EvalContext context) { 039 final EvalContext[] argCtxs = new EvalContext[args.length]; 040 for (int i = 0; i < args.length; i++) { 041 final Object value = args[i].compute(context); 042 if (value instanceof EvalContext) { 043 argCtxs[i] = (EvalContext) value; 044 } else { 045 argCtxs[i] = context.getRootContext().getConstantContext(value); 046 } 047 } 048 return new UnionContext(context.getRootContext(), argCtxs); 049 } 050 051 @Override 052 protected int getPrecedence() { 053 return UNION_PRECEDENCE; 054 } 055 056 @Override 057 public String getSymbol() { 058 return "|"; 059 } 060 061 @Override 062 protected boolean isSymmetric() { 063 return true; 064 } 065}