/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
***************************************************************************************
*/
package com.espertech.esper.epl.expression.ops;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.expression.core.*;
import com.espertech.esper.metrics.instrumentation.InstrumentationHelper;
import com.espertech.esper.type.RelationalOpEnum;
import com.espertech.esper.util.CoercionException;
import com.espertech.esper.util.JavaClassHelper;
import java.io.StringWriter;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
/**
* Represents a lesser or greater then (</<=/>/>=) expression in a filter expression tree.
*/
public class ExprRelationalOpAllAnyNode extends ExprNodeBase implements ExprEvaluator {
private final RelationalOpEnum relationalOpEnum;
private final boolean isAll;
private boolean hasCollectionOrArray;
private transient RelationalOpEnum.Computer computer;
private transient ExprEvaluator[] evaluators;
private static final long serialVersionUID = -9212002972361997109L;
/**
* Ctor.
*
* @param relationalOpEnum - type of compare, ie. lt, gt, le, ge
* @param isAll - true if all, false for any
*/
public ExprRelationalOpAllAnyNode(RelationalOpEnum relationalOpEnum, boolean isAll) {
this.relationalOpEnum = relationalOpEnum;
this.isAll = isAll;
}
public ExprEvaluator getExprEvaluator() {
return this;
}
public boolean isConstantResult() {
return false;
}
/**
* Returns true for ALL, false for ANY.
*
* @return indicator all or any
*/
public boolean isAll() {
return isAll;
}
/**
* Returns the type of relational op used.
*
* @return enum with relational op type
*/
public RelationalOpEnum getRelationalOpEnum() {
return relationalOpEnum;
}
public ExprNode validate(ExprValidationContext validationContext) throws ExprValidationException {
// Must have 2 child nodes
if (this.getChildNodes().length < 1) {
throw new IllegalStateException("Group relational op node must have 1 or more parameters");
}
evaluators = ExprNodeUtility.getEvaluators(this.getChildNodes());
Class typeOne = JavaClassHelper.getBoxedType(evaluators[0].getType());
// collections, array or map not supported
if ((typeOne.isArray()) || (JavaClassHelper.isImplementsInterface(typeOne, Collection.class)) || (JavaClassHelper.isImplementsInterface(typeOne, Map.class))) {
throw new ExprValidationException("Collection or array comparison is not allowed for the IN, ANY, SOME or ALL keywords");
}
List<Class> comparedTypes = new ArrayList<Class>();
comparedTypes.add(typeOne);
hasCollectionOrArray = false;
for (int i = 0; i < this.getChildNodes().length - 1; i++) {
Class propType = evaluators[i + 1].getType();
if (propType.isArray()) {
hasCollectionOrArray = true;
if (propType.getComponentType() != Object.class) {
comparedTypes.add(propType.getComponentType());
}
} else if (JavaClassHelper.isImplementsInterface(propType, Collection.class)) {
hasCollectionOrArray = true;
} else if (JavaClassHelper.isImplementsInterface(propType, Map.class)) {
hasCollectionOrArray = true;
} else {
comparedTypes.add(propType);
}
}
// Determine common denominator type
Class coercionType;
try {
coercionType = JavaClassHelper.getCommonCoercionType(comparedTypes.toArray(new Class[comparedTypes.size()]));
} catch (CoercionException ex) {
throw new ExprValidationException("Implicit conversion not allowed: " + ex.getMessage());
}
// Must be either numeric or string
if (coercionType != String.class) {
if (!JavaClassHelper.isNumeric(coercionType)) {
throw new ExprValidationException("Implicit conversion from datatype '" +
coercionType.getSimpleName() +
"' to numeric is not allowed");
}
}
computer = relationalOpEnum.getComputer(coercionType, coercionType, coercionType);
return null;
}
public Class getType() {
return Boolean.class;
}
public Object evaluate(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) {
if (InstrumentationHelper.ENABLED) {
InstrumentationHelper.get().qExprRelOpAnyOrAll(this, relationalOpEnum.getExpressionText());
}
Boolean result = evaluateInternal(eventsPerStream, isNewData, exprEvaluatorContext);
if (InstrumentationHelper.ENABLED) {
InstrumentationHelper.get().aExprRelOpAnyOrAll(result);
}
return result;
}
private Boolean evaluateInternal(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) {
if (this.getChildNodes().length == 1) {
return false;
}
Object valueLeft = evaluators[0].evaluate(eventsPerStream, isNewData, exprEvaluatorContext);
int len = this.getChildNodes().length - 1;
if (hasCollectionOrArray) {
boolean hasNonNullRow = false;
boolean hasRows = false;
for (int i = 1; i <= len; i++) {
Object valueRight = evaluators[i].evaluate(eventsPerStream, isNewData, exprEvaluatorContext);
if (valueRight == null) {
continue;
}
if (valueRight instanceof Collection) {
Collection coll = (Collection) valueRight;
hasRows = true;
for (Object item : coll) {
if (!(item instanceof Number)) {
if (isAll && item == null) {
return null;
}
continue;
}
hasNonNullRow = true;
if (valueLeft != null) {
if (isAll) {
if (!computer.compare(valueLeft, item)) {
return false;
}
} else {
if (computer.compare(valueLeft, item)) {
return true;
}
}
}
}
} else if (valueRight instanceof Map) {
Map coll = (Map) valueRight;
hasRows = true;
for (Object item : coll.keySet()) {
if (!(item instanceof Number)) {
if (isAll && item == null) {
return null;
}
continue;
}
hasNonNullRow = true;
if (valueLeft != null) {
if (isAll) {
if (!computer.compare(valueLeft, item)) {
return false;
}
} else {
if (computer.compare(valueLeft, item)) {
return true;
}
}
}
}
} else if (valueRight.getClass().isArray()) {
hasRows = true;
int arrayLength = Array.getLength(valueRight);
for (int index = 0; index < arrayLength; index++) {
Object item = Array.get(valueRight, index);
if (item == null) {
if (isAll) {
return null;
}
continue;
}
hasNonNullRow = true;
if (valueLeft != null) {
if (isAll) {
if (!computer.compare(valueLeft, item)) {
return false;
}
} else {
if (computer.compare(valueLeft, item)) {
return true;
}
}
}
}
} else if (!(valueRight instanceof Number)) {
if (isAll) {
return null;
}
} else {
hasNonNullRow = true;
if (isAll) {
if (!computer.compare(valueLeft, valueRight)) {
return false;
}
} else {
if (computer.compare(valueLeft, valueRight)) {
return true;
}
}
}
}
if (isAll) {
if (!hasRows) {
return true;
}
if ((!hasNonNullRow) || (valueLeft == null)) {
return null;
}
return true;
} else {
if (!hasRows) {
return false;
}
if ((!hasNonNullRow) || (valueLeft == null)) {
return null;
}
return false;
}
} else {
boolean hasNonNullRow = false;
boolean hasRows = false;
for (int i = 1; i <= len; i++) {
Object valueRight = evaluators[i].evaluate(eventsPerStream, isNewData, exprEvaluatorContext);
hasRows = true;
if (valueRight != null) {
hasNonNullRow = true;
} else {
if (isAll) {
return null;
}
}
if ((valueRight != null) && (valueLeft != null)) {
if (isAll) {
if (!computer.compare(valueLeft, valueRight)) {
return false;
}
} else {
if (computer.compare(valueLeft, valueRight)) {
return true;
}
}
}
}
if (isAll) {
if (!hasRows) {
return true;
}
if ((!hasNonNullRow) || (valueLeft == null)) {
return null;
}
return true;
} else {
if (!hasRows) {
return false;
}
if ((!hasNonNullRow) || (valueLeft == null)) {
return null;
}
return false;
}
}
}
public void toPrecedenceFreeEPL(StringWriter writer) {
this.getChildNodes()[0].toEPL(writer, getPrecedence());
writer.append(relationalOpEnum.getExpressionText());
if (isAll) {
writer.append("all");
} else {
writer.append("any");
}
writer.append("(");
String delimiter = "";
for (int i = 0; i < this.getChildNodes().length - 1; i++) {
writer.append(delimiter);
this.getChildNodes()[i + 1].toEPL(writer, getPrecedence());
delimiter = ",";
}
writer.append(")");
}
public ExprPrecedenceEnum getPrecedence() {
return ExprPrecedenceEnum.RELATIONAL_BETWEEN_IN;
}
public boolean equalsNode(ExprNode node, boolean ignoreStreamPrefix) {
if (!(node instanceof ExprRelationalOpAllAnyNode)) {
return false;
}
ExprRelationalOpAllAnyNode other = (ExprRelationalOpAllAnyNode) node;
if ((other.relationalOpEnum != this.relationalOpEnum) ||
(other.isAll != this.isAll)) {
return false;
}
return true;
}
}