| /* |
| * |
| * 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.qpid.filter; |
| // |
| // Based on like named file from r450141 of the Apache ActiveMQ project <http://www.activemq.org/site/home.html> |
| // |
| |
| import java.math.BigDecimal; |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.List; |
| |
| /** |
| * 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); |
| private Expression right; |
| |
| public static Expression createNegate(Expression left) |
| { |
| return new NegativeExpression(left); |
| } |
| |
| public static BooleanExpression createInExpression(PropertyExpression right, List elements, final boolean not) |
| { |
| |
| // Use a HashSet if there are many elements. |
| Collection t; |
| if (elements.size() == 0) |
| { |
| t = null; |
| } |
| else if (elements.size() < 5) |
| { |
| t = elements; |
| } |
| else |
| { |
| t = new HashSet(elements); |
| } |
| |
| final Collection inList = t; |
| |
| return new InExpression(right, inList, not); |
| } |
| |
| abstract static class BooleanUnaryExpression extends UnaryExpression implements BooleanExpression |
| { |
| public BooleanUnaryExpression(Expression left) |
| { |
| super(left); |
| } |
| |
| public boolean matches(FilterableMessage message) |
| { |
| Object object = evaluate(message); |
| |
| return (object != null) && (object == Boolean.TRUE); |
| } |
| } |
| |
| public static BooleanExpression createNOT(BooleanExpression left) |
| { |
| return new NotExpression(left); |
| } |
| |
| public static BooleanExpression createBooleanCast(Expression left) |
| { |
| return new BooleanCastExpression(left); |
| } |
| |
| private static Number negate(Number left) |
| { |
| Class clazz = left.getClass(); |
| if (clazz == Integer.class) |
| { |
| return -left.intValue(); |
| } |
| else if (clazz == Long.class) |
| { |
| return -left.longValue(); |
| } |
| else if (clazz == Float.class) |
| { |
| return -left.floatValue(); |
| } |
| else if (clazz == Double.class) |
| { |
| return -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.MIN_VALUE; |
| } |
| |
| return bd; |
| } |
| else |
| { |
| throw new SelectorParsingException("Don't know how to negate: " + left); |
| } |
| } |
| |
| public UnaryExpression(Expression left) |
| { |
| this.right = left; |
| } |
| |
| public Expression getRight() |
| { |
| return right; |
| } |
| |
| /** |
| * @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) |
| { |
| return ((o != null) && this.getClass().equals(o.getClass())) && toString().equals(o.toString()); |
| } |
| |
| /** |
| * Returns the symbol that represents this binary expression. For example, addition is |
| * represented by "+" |
| * |
| * @return symbol |
| */ |
| public abstract String getExpressionSymbol(); |
| |
| private static class NegativeExpression extends UnaryExpression |
| { |
| public NegativeExpression(final Expression left) |
| { |
| super(left); |
| } |
| |
| public Object evaluate(FilterableMessage message) |
| { |
| Object rvalue = getRight().evaluate(message); |
| if (rvalue == null) |
| { |
| return null; |
| } |
| |
| if (rvalue instanceof Number) |
| { |
| return negate((Number) rvalue); |
| } |
| |
| return null; |
| } |
| |
| public String getExpressionSymbol() |
| { |
| return "-"; |
| } |
| } |
| |
| private static class InExpression extends BooleanUnaryExpression |
| { |
| private final Collection _inList; |
| private final boolean _not; |
| |
| public InExpression(final PropertyExpression right, final Collection inList, final boolean not) |
| { |
| super(right); |
| _inList = inList; |
| _not = not; |
| } |
| |
| public Object evaluate(FilterableMessage message) |
| { |
| |
| Object rvalue = getRight().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() |
| { |
| StringBuilder answer = new StringBuilder(String.valueOf(getRight())); |
| answer.append(" "); |
| answer.append(getExpressionSymbol()); |
| answer.append(" ( "); |
| |
| int count = 0; |
| for (Object o : _inList) |
| { |
| 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"; |
| } |
| } |
| } |
| |
| private static class NotExpression extends BooleanUnaryExpression |
| { |
| public NotExpression(final BooleanExpression left) |
| { |
| super(left); |
| } |
| |
| public Object evaluate(FilterableMessage message) |
| { |
| Boolean lvalue = (Boolean) getRight().evaluate(message); |
| if (lvalue == null) |
| { |
| return null; |
| } |
| |
| return lvalue ? Boolean.FALSE : Boolean.TRUE; |
| } |
| |
| public String getExpressionSymbol() |
| { |
| return "NOT"; |
| } |
| } |
| |
| private static class BooleanCastExpression extends BooleanUnaryExpression |
| { |
| public BooleanCastExpression(final Expression left) |
| { |
| super(left); |
| } |
| |
| public Object evaluate(FilterableMessage message) |
| { |
| Object rvalue = getRight().evaluate(message); |
| if (rvalue == null) |
| { |
| return null; |
| } |
| |
| if (!rvalue.getClass().equals(Boolean.class)) |
| { |
| return Boolean.FALSE; |
| } |
| |
| return ((Boolean) rvalue) ? Boolean.TRUE : Boolean.FALSE; |
| } |
| |
| public String toString() |
| { |
| return getRight().toString(); |
| } |
| |
| public String getExpressionSymbol() |
| { |
| return ""; |
| } |
| } |
| } |