/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.jbpm.jpdl.el.impl;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationTargetException;
import java.util.List;
import java.util.Map;
import org.jbpm.jpdl.el.ELException;
import org.jbpm.jpdl.el.FunctionMapper;
import org.jbpm.jpdl.el.VariableResolver;
/**
*
* <p>
* Represents an operator that obtains a Map entry, an indexed value, a property
* value, or an indexed property value of an object. The following are the rules
* for evaluating this operator:
*
* <ul>
*
* <pre>
* Evaluating a[b] (assuming a.b == a["b"])
* a is null
* return null
* b is null
* return null
* a is Map
* !a.containsKey (b)
* return null
* a.get(b) == null
* return null
* otherwise
* return a.get(b)
* a is List or array
* coerce b to int (using coercion rules)
* coercion couldn't be performed
* error
* a.get(b) or Array.get(a, b) throws ArrayIndexOutOfBoundsException or IndexOutOfBoundsException
* return null
* a.get(b) or Array.get(a, b) throws other exception
* error
* return a.get(b) or Array.get(a, b)
*
* coerce b to String
* b is a readable property of a
* getter throws an exception
* error
* otherwise
* return result of getter call
*
* otherwise
* error
* </pre>
*
* </ul>
*
* @author Nathan Abramson - Art Technology Group
* @author Shawn Bayern
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author$
*/
public class ArraySuffix extends ValueSuffix {
// -------------------------------------
// Constants
// -------------------------------------
// Zero-argument array
static Object[] sNoArgs = new Object[0];
// -------------------------------------
// Properties
// -------------------------------------
// property index
Expression mIndex;
public Expression getIndex() {
return mIndex;
}
public void setIndex(Expression pIndex) {
mIndex = pIndex;
}
// -------------------------------------
/**
*
* Constructor
*/
public ArraySuffix(Expression pIndex) {
mIndex = pIndex;
}
// -------------------------------------
/**
*
* Gets the value of the index
*/
Object evaluateIndex(VariableResolver pResolver, FunctionMapper functions, Logger pLogger) throws ELException {
return mIndex.evaluate(pResolver, functions, pLogger);
}
// -------------------------------------
/**
*
* Returns the operator symbol
*/
String getOperatorSymbol() {
return "[]";
}
// -------------------------------------
// ValueSuffix methods
// -------------------------------------
/**
*
* Returns the expression in the expression language syntax
*/
public String getExpressionString() {
return "[" + mIndex.getExpressionString() + "]";
}
// -------------------------------------
/**
*
* Evaluates the expression in the given context, operating on the given
* value.
*/
public Object evaluate(Object pValue, VariableResolver pResolver, FunctionMapper functions, Logger pLogger) throws ELException {
Object indexVal;
String indexStr;
BeanInfoProperty beanInfoProperty;
BeanMethod beanMethod;
// Check for null value
if (pValue == null) {
if (pLogger.isLoggingWarning()) {
pLogger.logWarning(Constants.CANT_GET_INDEXED_VALUE_OF_NULL, getOperatorSymbol());
}
return null;
}
// Evaluate the index
else if ((indexVal = evaluateIndex(pResolver, functions, pLogger)) == null) {
if (pLogger.isLoggingWarning()) {
pLogger.logWarning(Constants.CANT_GET_NULL_INDEX, getOperatorSymbol());
}
return null;
}
// See if it's a Map
else if (pValue instanceof Map) {
Map val = (Map) pValue;
return val.get(indexVal);
}
// See if it's a List or array
else if (pValue instanceof List || pValue.getClass().isArray()) {
Integer indexObj = Coercions.coerceToInteger(indexVal, pLogger);
if (indexObj == null) {
if (pLogger.isLoggingError()) {
pLogger.logError(Constants.BAD_INDEX_VALUE, getOperatorSymbol(), indexVal.getClass().getName());
}
return null;
} else if (pValue instanceof List) {
try {
return ((List) pValue).get(indexObj.intValue());
} catch (ArrayIndexOutOfBoundsException exc) {
if (pLogger.isLoggingWarning()) {
pLogger.logWarning(Constants.EXCEPTION_ACCESSING_LIST, exc, indexObj);
}
return null;
} catch (IndexOutOfBoundsException exc) {
if (pLogger.isLoggingWarning()) {
pLogger.logWarning(Constants.EXCEPTION_ACCESSING_LIST, exc, indexObj);
}
return null;
} catch (Exception exc) {
if (pLogger.isLoggingError()) {
pLogger.logError(Constants.EXCEPTION_ACCESSING_LIST, exc, indexObj);
}
return null;
}
} else {
try {
return Array.get(pValue, indexObj.intValue());
} catch (ArrayIndexOutOfBoundsException exc) {
if (pLogger.isLoggingWarning()) {
pLogger.logWarning(Constants.EXCEPTION_ACCESSING_ARRAY, exc, indexObj);
}
return null;
} catch (IndexOutOfBoundsException exc) {
if (pLogger.isLoggingWarning()) {
pLogger.logWarning(Constants.EXCEPTION_ACCESSING_ARRAY, exc, indexObj);
}
return null;
} catch (Exception exc) {
if (pLogger.isLoggingError()) {
pLogger.logError(Constants.EXCEPTION_ACCESSING_ARRAY, exc, indexObj);
}
return null;
}
}
}
// Coerce to a String for property access
else if ((indexStr = Coercions.coerceToString(indexVal, pLogger)) == null) {
return null;
}
// Look for a JavaBean property
else if ((beanInfoProperty = BeanInfoManager.getBeanInfoProperty(pValue.getClass(), indexStr, pLogger)) != null && beanInfoProperty.getReadMethod() != null) {
try {
return beanInfoProperty.getReadMethod().invoke(pValue, sNoArgs);
} catch (InvocationTargetException exc) {
if (pLogger.isLoggingError()) {
pLogger.logError(Constants.ERROR_GETTING_PROPERTY, exc.getTargetException(), indexStr, pValue.getClass().getName());
}
return null;
} catch (Exception exc) {
if (pLogger.isLoggingError()) {
pLogger.logError(Constants.ERROR_GETTING_PROPERTY, exc, indexStr, pValue.getClass().getName());
}
return null;
}
}
// Look for a JavaBean method
else if ((beanMethod = BeanInfoManager.getBeanMethod(pValue.getClass(), indexStr, pLogger)) != null) {
try {
return beanMethod.invoke(pValue);
} catch (InvocationTargetException exc) {
if (pLogger.isLoggingError()) {
pLogger.logError(Constants.ERROR_INVOKING_METHOD, exc.getTargetException(), indexStr, pValue.getClass().getName());
}
return null;
} catch (Exception exc) {
if (pLogger.isLoggingError()) {
pLogger.logError(Constants.ERROR_INVOKING_METHOD, exc, indexStr, pValue.getClass().getName());
}
return null;
}
}
else {
if (pLogger.isLoggingError()) {
pLogger.logError(Constants.CANT_FIND_INDEX, indexVal, pValue.getClass().getName(), getOperatorSymbol());
}
return null;
}
}
// -------------------------------------
}