- /*
- * 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.apache.commons.el;
-
- import java.lang.reflect.Array;
- import java.lang.reflect.InvocationTargetException;
- import java.util.List;
- import java.util.Map;
- import javax.servlet.jsp.el.VariableResolver;
- import javax.servlet.jsp.el.ELException;
- import javax.servlet.jsp.el.FunctionMapper;
-
- /**
- *
- * <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: luehe $
- **/
-
- 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 property;
- BeanInfoIndexedProperty ixproperty;
-
- // 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 ((property = BeanInfoManager.getBeanInfoProperty
- (pValue.getClass (),
- indexStr,
- pLogger)) != null &&
- property.getReadMethod () != null) {
- try {
- return property.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;
- }
- }
-
- else {
- if (pLogger.isLoggingError ()) {
- pLogger.logError
- (Constants.CANT_FIND_INDEX,
- indexVal,
- pValue.getClass ().getName (),
- getOperatorSymbol ());
- }
- return null;
- }
- }
-
- //-------------------------------------
- }