| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.activemq.filter; |
| |
| import java.math.BigDecimal; |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import javax.jms.JMSException; |
| |
| /** |
| * An expression which performs an operation on two expression values |
| * |
| * |
| */ |
| public abstract class UnaryExpression implements Expression { |
| |
| private static final BigDecimal BD_LONG_MIN_VALUE = BigDecimal.valueOf(Long.MIN_VALUE); |
| protected Expression right; |
| |
| public UnaryExpression(Expression left) { |
| this.right = left; |
| } |
| |
| public static Expression createNegate(Expression left) { |
| return new UnaryExpression(left) { |
| public Object evaluate(MessageEvaluationContext message) throws JMSException { |
| Object rvalue = right.evaluate(message); |
| if (rvalue == null) { |
| return null; |
| } |
| if (rvalue instanceof Number) { |
| return negate((Number)rvalue); |
| } |
| return null; |
| } |
| |
| public String getExpressionSymbol() { |
| return "-"; |
| } |
| }; |
| } |
| |
| public static BooleanExpression createInExpression(PropertyExpression right, List<Object> elements, final boolean not) { |
| |
| // Use a HashSet if there are many elements. |
| Collection<Object> t; |
| if (elements.size() == 0) { |
| t = null; |
| } else if (elements.size() < 5) { |
| t = elements; |
| } else { |
| t = new HashSet<Object>(elements); |
| } |
| final Collection inList = t; |
| |
| return new BooleanUnaryExpression(right) { |
| public Object evaluate(MessageEvaluationContext message) throws JMSException { |
| |
| Object rvalue = right.evaluate(message); |
| if (rvalue == null) { |
| return null; |
| } |
| if (rvalue.getClass() != String.class) { |
| return null; |
| } |
| |
| if ((inList != null && inList.contains(rvalue)) ^ not) { |
| return Boolean.TRUE; |
| } else { |
| return Boolean.FALSE; |
| } |
| |
| } |
| |
| public String toString() { |
| StringBuffer answer = new StringBuffer(); |
| answer.append(right); |
| answer.append(" "); |
| answer.append(getExpressionSymbol()); |
| answer.append(" ( "); |
| |
| int count = 0; |
| for (Iterator i = inList.iterator(); i.hasNext();) { |
| Object o = (Object)i.next(); |
| if (count != 0) { |
| answer.append(", "); |
| } |
| answer.append(o); |
| count++; |
| } |
| |
| answer.append(" )"); |
| return answer.toString(); |
| } |
| |
| public String getExpressionSymbol() { |
| if (not) { |
| return "NOT IN"; |
| } else { |
| return "IN"; |
| } |
| } |
| }; |
| } |
| |
| abstract static class BooleanUnaryExpression extends UnaryExpression implements BooleanExpression { |
| public BooleanUnaryExpression(Expression left) { |
| super(left); |
| } |
| |
| public boolean matches(MessageEvaluationContext message) throws JMSException { |
| Object object = evaluate(message); |
| return object != null && object == Boolean.TRUE; |
| } |
| }; |
| |
| public static BooleanExpression createNOT(BooleanExpression left) { |
| return new BooleanUnaryExpression(left) { |
| public Object evaluate(MessageEvaluationContext message) throws JMSException { |
| Boolean lvalue = (Boolean)right.evaluate(message); |
| if (lvalue == null) { |
| return null; |
| } |
| return lvalue.booleanValue() ? Boolean.FALSE : Boolean.TRUE; |
| } |
| |
| public String getExpressionSymbol() { |
| return "NOT"; |
| } |
| }; |
| } |
| |
| public static BooleanExpression createXPath(final String xpath) { |
| return new XPathExpression(xpath); |
| } |
| |
| public static BooleanExpression createXQuery(final String xpath) { |
| return new XQueryExpression(xpath); |
| } |
| |
| public static BooleanExpression createBooleanCast(Expression left) { |
| return new BooleanUnaryExpression(left) { |
| public Object evaluate(MessageEvaluationContext message) throws JMSException { |
| Object rvalue = right.evaluate(message); |
| if (rvalue == null) { |
| return null; |
| } |
| if (!rvalue.getClass().equals(Boolean.class)) { |
| return Boolean.FALSE; |
| } |
| return ((Boolean)rvalue).booleanValue() ? Boolean.TRUE : Boolean.FALSE; |
| } |
| |
| public String toString() { |
| return right.toString(); |
| } |
| |
| public String getExpressionSymbol() { |
| return ""; |
| } |
| }; |
| } |
| |
| private static Number negate(Number left) { |
| Class clazz = left.getClass(); |
| if (clazz == Integer.class) { |
| return new Integer(-left.intValue()); |
| } else if (clazz == Long.class) { |
| return new Long(-left.longValue()); |
| } else if (clazz == Float.class) { |
| return new Float(-left.floatValue()); |
| } else if (clazz == Double.class) { |
| return new Double(-left.doubleValue()); |
| } else if (clazz == BigDecimal.class) { |
| // We ussually get a big deciamal when we have Long.MIN_VALUE |
| // constant in the |
| // Selector. Long.MIN_VALUE is too big to store in a Long as a |
| // positive so we store it |
| // as a Big decimal. But it gets Negated right away.. to here we try |
| // to covert it back |
| // to a Long. |
| BigDecimal bd = (BigDecimal)left; |
| bd = bd.negate(); |
| |
| if (BD_LONG_MIN_VALUE.compareTo(bd) == 0) { |
| return Long.valueOf(Long.MIN_VALUE); |
| } |
| return bd; |
| } else { |
| throw new RuntimeException("Don't know how to negate: " + left); |
| } |
| } |
| |
| public Expression getRight() { |
| return right; |
| } |
| |
| public void setRight(Expression expression) { |
| right = expression; |
| } |
| |
| /** |
| * @see java.lang.Object#toString() |
| */ |
| public String toString() { |
| return "(" + getExpressionSymbol() + " " + right.toString() + ")"; |
| } |
| |
| /** |
| * TODO: more efficient hashCode() |
| * |
| * @see java.lang.Object#hashCode() |
| */ |
| public int hashCode() { |
| return toString().hashCode(); |
| } |
| |
| /** |
| * TODO: more efficient hashCode() |
| * |
| * @see java.lang.Object#equals(java.lang.Object) |
| */ |
| public boolean equals(Object o) { |
| |
| if (o == null || !this.getClass().equals(o.getClass())) { |
| return false; |
| } |
| return toString().equals(o.toString()); |
| |
| } |
| |
| /** |
| * Returns the symbol that represents this binary expression. For example, |
| * addition is represented by "+" |
| * |
| * @return |
| */ |
| public abstract String getExpressionSymbol(); |
| |
| } |