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Diffstat (limited to 'trunk/qpid/java/client/src/main/java/org/apache/qpid/filter/ComparisonExpression.java')
| -rw-r--r-- | trunk/qpid/java/client/src/main/java/org/apache/qpid/filter/ComparisonExpression.java | 589 |
1 files changed, 0 insertions, 589 deletions
diff --git a/trunk/qpid/java/client/src/main/java/org/apache/qpid/filter/ComparisonExpression.java b/trunk/qpid/java/client/src/main/java/org/apache/qpid/filter/ComparisonExpression.java deleted file mode 100644 index adf360698b..0000000000 --- a/trunk/qpid/java/client/src/main/java/org/apache/qpid/filter/ComparisonExpression.java +++ /dev/null @@ -1,589 +0,0 @@ -/* 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; - -import org.apache.qpid.QpidException; -import org.apache.qpid.client.message.AbstractJMSMessage; - -import java.util.HashSet; -import java.util.List; -import java.util.regex.Pattern; - -/** - * A filter performing a comparison of two objects - */ -public abstract class ComparisonExpression extends BinaryExpression implements BooleanExpression -{ - - public static BooleanExpression createBetween(Expression value, Expression left, Expression right) - { - return LogicExpression.createAND(ComparisonExpression.createGreaterThanEqual(value, left), ComparisonExpression.createLessThanEqual(value, right)); - } - - public static BooleanExpression createNotBetween(Expression value, Expression left, Expression right) - { - return LogicExpression.createOR(ComparisonExpression.createLessThan(value, left), ComparisonExpression.createGreaterThan(value, right)); - } - - private static final HashSet REGEXP_CONTROL_CHARS = new HashSet(); - - static - { - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character('.')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character('\\')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character('[')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character(']')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character('^')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character('$')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character('?')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character('*')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character('+')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character('{')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character('}')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character('|')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character('(')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character(')')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character(':')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character('&')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character('<')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character('>')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character('=')); - ComparisonExpression.REGEXP_CONTROL_CHARS.add(new Character('!')); - } - - static class LikeExpression extends UnaryExpression implements BooleanExpression - { - - Pattern likePattern; - - /** - * @param right - */ - public LikeExpression(Expression right, String like, int escape) - { - super(right); - - StringBuffer regexp = new StringBuffer(like.length() * 2); - regexp.append("\\A"); // The beginning of the input - for (int i = 0; i < like.length(); i++) - { - char c = like.charAt(i); - if (escape == (0xFFFF & c)) - { - i++; - if (i >= like.length()) - { - // nothing left to escape... - break; - } - - char t = like.charAt(i); - regexp.append("\\x"); - regexp.append(Integer.toHexString(0xFFFF & t)); - } - else if (c == '%') - { - regexp.append(".*?"); // Do a non-greedy match - } - else if (c == '_') - { - regexp.append("."); // match one - } - else if (ComparisonExpression.REGEXP_CONTROL_CHARS.contains(new Character(c))) - { - regexp.append("\\x"); - regexp.append(Integer.toHexString(0xFFFF & c)); - } - else - { - regexp.append(c); - } - } - - regexp.append("\\z"); // The end of the input - - likePattern = Pattern.compile(regexp.toString(), Pattern.DOTALL); - } - - /** - * org.apache.activemq.filter.UnaryExpression#getExpressionSymbol() - */ - public String getExpressionSymbol() - { - return "LIKE"; - } - - /** - * org.apache.activemq.filter.Expression#evaluate(MessageEvaluationContext) - */ - public Object evaluate(AbstractJMSMessage message) throws QpidException - { - - Object rv = this.getRight().evaluate(message); - - if (rv == null) - { - return null; - } - - if (!(rv instanceof String)) - { - return - Boolean.FALSE; - // throw new RuntimeException("LIKE can only operate on String identifiers. LIKE attemped on: '" + rv.getClass()); - } - - return likePattern.matcher((String) rv).matches() ? Boolean.TRUE : Boolean.FALSE; - } - - public boolean matches(AbstractJMSMessage message) throws QpidException - { - Object object = evaluate(message); - - return (object != null) && (object == Boolean.TRUE); - } - } - - public static BooleanExpression createLike(Expression left, String right, String escape) - { - if ((escape != null) && (escape.length() != 1)) - { - throw new RuntimeException( - "The ESCAPE string litteral is invalid. It can only be one character. Litteral used: " + escape); - } - - int c = -1; - if (escape != null) - { - c = 0xFFFF & escape.charAt(0); - } - - return new LikeExpression(left, right, c); - } - - public static BooleanExpression createNotLike(Expression left, String right, String escape) - { - return UnaryExpression.createNOT(ComparisonExpression.createLike(left, right, escape)); - } - - public static BooleanExpression createInFilter(Expression left, List elements) - { - - if (!(left instanceof PropertyExpression)) - { - throw new RuntimeException("Expected a property for In expression, got: " + left); - } - - return UnaryExpression.createInExpression((PropertyExpression) left, elements, false); - - } - - public static BooleanExpression createNotInFilter(Expression left, List elements) - { - - if (!(left instanceof PropertyExpression)) - { - throw new RuntimeException("Expected a property for In expression, got: " + left); - } - - return UnaryExpression.createInExpression((PropertyExpression) left, elements, true); - - } - - public static BooleanExpression createIsNull(Expression left) - { - return ComparisonExpression.doCreateEqual(left, ConstantExpression.NULL); - } - - public static BooleanExpression createIsNotNull(Expression left) - { - return UnaryExpression.createNOT(ComparisonExpression.doCreateEqual(left, ConstantExpression.NULL)); - } - - public static BooleanExpression createNotEqual(Expression left, Expression right) - { - return UnaryExpression.createNOT(ComparisonExpression.createEqual(left, right)); - } - - public static BooleanExpression createEqual(Expression left, Expression right) - { - ComparisonExpression.checkEqualOperand(left); - ComparisonExpression.checkEqualOperand(right); - ComparisonExpression.checkEqualOperandCompatability(left, right); - - return ComparisonExpression.doCreateEqual(left, right); - } - - private static BooleanExpression doCreateEqual(Expression left, Expression right) - { - return new ComparisonExpression(left, right) - { - - public Object evaluate(AbstractJMSMessage message) throws QpidException - { - Object lv = left.evaluate(message); - Object rv = right.evaluate(message); - - // Iff one of the values is null - if ((lv == null) ^ (rv == null)) - { - return Boolean.FALSE; - } - - if ((lv == rv) || lv.equals(rv)) - { - return Boolean.TRUE; - } - - if ((lv instanceof Comparable) && (rv instanceof Comparable)) - { - return compare((Comparable) lv, (Comparable) rv); - } - - return Boolean.FALSE; - } - - protected boolean asBoolean(int answer) - { - return answer == 0; - } - - public String getExpressionSymbol() - { - return "="; - } - }; - } - - public static BooleanExpression createGreaterThan(final Expression left, final Expression right) - { - ComparisonExpression.checkLessThanOperand(left); - ComparisonExpression.checkLessThanOperand(right); - - return new ComparisonExpression(left, right) - { - protected boolean asBoolean(int answer) - { - return answer > 0; - } - - public String getExpressionSymbol() - { - return ">"; - } - }; - } - - public static BooleanExpression createGreaterThanEqual(final Expression left, final Expression right) - { - ComparisonExpression.checkLessThanOperand(left); - ComparisonExpression.checkLessThanOperand(right); - - return new ComparisonExpression(left, right) - { - protected boolean asBoolean(int answer) - { - return answer >= 0; - } - - public String getExpressionSymbol() - { - return ">="; - } - }; - } - - public static BooleanExpression createLessThan(final Expression left, final Expression right) - { - ComparisonExpression.checkLessThanOperand(left); - ComparisonExpression.checkLessThanOperand(right); - - return new ComparisonExpression(left, right) - { - - protected boolean asBoolean(int answer) - { - return answer < 0; - } - - public String getExpressionSymbol() - { - return "<"; - } - - }; - } - - public static BooleanExpression createLessThanEqual(final Expression left, final Expression right) - { - ComparisonExpression.checkLessThanOperand(left); - ComparisonExpression.checkLessThanOperand(right); - - return new ComparisonExpression(left, right) - { - - protected boolean asBoolean(int answer) - { - return answer <= 0; - } - - public String getExpressionSymbol() - { - return "<="; - } - }; - } - - /** - * Only Numeric expressions can be used in >, >=, < or <= expressions.s - * - * @param expr - */ - public static void checkLessThanOperand(Expression expr) - { - if (expr instanceof ConstantExpression) - { - Object value = ((ConstantExpression) expr).getValue(); - if (value instanceof Number) - { - return; - } - - // Else it's boolean or a String.. - throw new RuntimeException("Value '" + expr + "' cannot be compared."); - } - - if (expr instanceof BooleanExpression) - { - throw new RuntimeException("Value '" + expr + "' cannot be compared."); - } - } - - /** - * Validates that the expression can be used in == or <> expression. - * Cannot not be NULL TRUE or FALSE litterals. - * - * @param expr - */ - public static void checkEqualOperand(Expression expr) - { - if (expr instanceof ConstantExpression) - { - Object value = ((ConstantExpression) expr).getValue(); - if (value == null) - { - throw new RuntimeException("'" + expr + "' cannot be compared."); - } - } - } - - /** - * - * @param left - * @param right - */ - private static void checkEqualOperandCompatability(Expression left, Expression right) - { - if ((left instanceof ConstantExpression) && (right instanceof ConstantExpression)) - { - if ((left instanceof BooleanExpression) && !(right instanceof BooleanExpression)) - { - throw new RuntimeException("'" + left + "' cannot be compared with '" + right + "'"); - } - } - } - - /** - * @param left - * @param right - */ - public ComparisonExpression(Expression left, Expression right) - { - super(left, right); - } - - public Object evaluate(AbstractJMSMessage message) throws QpidException - { - Comparable lv = (Comparable) left.evaluate(message); - if (lv == null) - { - return null; - } - - Comparable rv = (Comparable) right.evaluate(message); - if (rv == null) - { - return null; - } - - return compare(lv, rv); - } - - protected Boolean compare(Comparable lv, Comparable rv) - { - Class lc = lv.getClass(); - Class rc = rv.getClass(); - // If the the objects are not of the same type, - // try to convert up to allow the comparison. - if (lc != rc) - { - if (lc == Byte.class) - { - if (rc == Short.class) - { - lv = new Short(((Number) lv).shortValue()); - } - else if (rc == Integer.class) - { - lv = new Integer(((Number) lv).intValue()); - } - else if (rc == Long.class) - { - lv = new Long(((Number) lv).longValue()); - } - else if (rc == Float.class) - { - lv = new Float(((Number) lv).floatValue()); - } - else if (rc == Double.class) - { - lv = new Double(((Number) lv).doubleValue()); - } - else - { - return Boolean.FALSE; - } - } - else if (lc == Short.class) - { - if (rc == Integer.class) - { - lv = new Integer(((Number) lv).intValue()); - } - else if (rc == Long.class) - { - lv = new Long(((Number) lv).longValue()); - } - else if (rc == Float.class) - { - lv = new Float(((Number) lv).floatValue()); - } - else if (rc == Double.class) - { - lv = new Double(((Number) lv).doubleValue()); - } - else - { - return Boolean.FALSE; - } - } - else if (lc == Integer.class) - { - if (rc == Long.class) - { - lv = new Long(((Number) lv).longValue()); - } - else if (rc == Float.class) - { - lv = new Float(((Number) lv).floatValue()); - } - else if (rc == Double.class) - { - lv = new Double(((Number) lv).doubleValue()); - } - else - { - return Boolean.FALSE; - } - } - else if (lc == Long.class) - { - if (rc == Integer.class) - { - rv = new Long(((Number) rv).longValue()); - } - else if (rc == Float.class) - { - lv = new Float(((Number) lv).floatValue()); - } - else if (rc == Double.class) - { - lv = new Double(((Number) lv).doubleValue()); - } - else - { - return Boolean.FALSE; - } - } - else if (lc == Float.class) - { - if (rc == Integer.class) - { - rv = new Float(((Number) rv).floatValue()); - } - else if (rc == Long.class) - { - rv = new Float(((Number) rv).floatValue()); - } - else if (rc == Double.class) - { - lv = new Double(((Number) lv).doubleValue()); - } - else - { - return Boolean.FALSE; - } - } - else if (lc == Double.class) - { - if (rc == Integer.class) - { - rv = new Double(((Number) rv).doubleValue()); - } - else if (rc == Long.class) - { - rv = new Double(((Number) rv).doubleValue()); - } - else if (rc == Float.class) - { - rv = new Float(((Number) rv).doubleValue()); - } - else - { - return Boolean.FALSE; - } - } - else - { - return Boolean.FALSE; - } - } - - return asBoolean(lv.compareTo(rv)) ? Boolean.TRUE : Boolean.FALSE; - } - - protected abstract boolean asBoolean(int answer); - - public boolean matches(AbstractJMSMessage message) throws QpidException - { - Object object = evaluate(message); - - return (object != null) && (object == Boolean.TRUE); - } - -} |