org.springframework.expression.spel.ExpressionState Java Examples

@Test
public void test_binaryPlusWithTime_ToString() {

	ExpressionState expressionState = new ExpressionState(new StandardEvaluationContext());

	Time time = new Time(new Date().getTime());

	VariableReference var = new VariableReference("timeVar", -1);
	var.setValue(expressionState, time);

	StringLiteral n2 = new StringLiteral("\" is now\"", -1, "\" is now\"");
	OpPlus o = new OpPlus(-1, var, n2);
	TypedValue value = o.getValueInternal(expressionState);

	assertEquals(String.class, value.getTypeDescriptor().getObjectType());
	assertEquals(String.class, value.getTypeDescriptor().getType());
	assertEquals(time + " is now", value.getValue());
}
 

/**
 * Returns a boolean based on whether a value is in the range expressed. The first
 * operand is any value whilst the second is a list of two values - those two values
 * being the bounds allowed for the first operand (inclusive).
 * @param state the expression state
 * @return true if the left operand is in the range specified, false otherwise
 * @throws EvaluationException if there is a problem evaluating the expression
 */
@Override
public BooleanTypedValue getValueInternal(ExpressionState state) throws EvaluationException {
	Object left = getLeftOperand().getValueInternal(state).getValue();
	Object right = getRightOperand().getValueInternal(state).getValue();
	if (!(right instanceof List) || ((List<?>) right).size() != 2) {
		throw new SpelEvaluationException(getRightOperand().getStartPosition(),
				SpelMessage.BETWEEN_RIGHT_OPERAND_MUST_BE_TWO_ELEMENT_LIST);
	}

	List<?> list = (List<?>) right;
	Object low = list.get(0);
	Object high = list.get(1);
	TypeComparator comp = state.getTypeComparator();
	try {
		return BooleanTypedValue.forValue(comp.compare(left, low) >= 0 && comp.compare(left, high) <= 0);
	}
	catch (SpelEvaluationException ex) {
		ex.setPosition(getStartPosition());
		throw ex;
	}
}
 

@Override
public TypedValue getValueInternal(ExpressionState state) throws EvaluationException {
	TypedValue value = state.lookupVariable(this.name);
	if (value == null) {
		throw new SpelEvaluationException(getStartPosition(), SpelMessage.FUNCTION_NOT_DEFINED, this.name);
	}

	// Two possibilities: a lambda function or a Java static method registered as a function
	if (!(value.getValue() instanceof Method)) {
		throw new SpelEvaluationException(
				SpelMessage.FUNCTION_REFERENCE_CANNOT_BE_INVOKED, this.name, value.getClass());
	}

	try {
		return executeFunctionJLRMethod(state, (Method) value.getValue());
	}
	catch (SpelEvaluationException ex) {
		ex.setPosition(getStartPosition());
		throw ex;
	}
}
 

@Override
public Object getValue(EvaluationContext context) throws EvaluationException {
	Assert.notNull(context, "EvaluationContext is required");
	if (compiledAst!= null) {
		try {
			TypedValue contextRoot = context == null ? null : context.getRootObject();
			return this.compiledAst.getValue(contextRoot != null ? contextRoot.getValue() : null, context);
		}
		catch (Throwable ex) {
			// If running in mixed mode, revert to interpreted
			if (this.configuration.getCompilerMode() == SpelCompilerMode.MIXED) {
				this.interpretedCount = 0;
				this.compiledAst = null;
			}
			else {
				// Running in SpelCompilerMode.immediate mode - propagate exception to caller
				throw new SpelEvaluationException(ex, SpelMessage.EXCEPTION_RUNNING_COMPILED_EXPRESSION);
			}
		}
	}
	ExpressionState expressionState = new ExpressionState(context, this.configuration);
	Object result = this.ast.getValue(expressionState);
	checkCompile(expressionState);
	return result;
}
 

@Override
public Object getValue(EvaluationContext context, Object rootObject) throws EvaluationException {
	Assert.notNull(context, "EvaluationContext is required");
	if (this.compiledAst != null) {
		try {
			return this.compiledAst.getValue(rootObject,context);
		}
		catch (Throwable ex) {
			// If running in mixed mode, revert to interpreted
			if (this.configuration.getCompilerMode() == SpelCompilerMode.MIXED) {
				this.interpretedCount = 0;
				this.compiledAst = null;
			}
			else {
				// Running in SpelCompilerMode.immediate mode - propagate exception to caller
				throw new SpelEvaluationException(ex, SpelMessage.EXCEPTION_RUNNING_COMPILED_EXPRESSION);
			}
		}
	}
	ExpressionState expressionState = new ExpressionState(context, toTypedValue(rootObject), this.configuration);
	Object result = this.ast.getValue(expressionState);
	checkCompile(expressionState);
	return result;
}
 

@Override
public TypedValue getValueInternal(ExpressionState state) throws EvaluationException {
	BeanResolver beanResolver = state.getEvaluationContext().getBeanResolver();
	if (beanResolver == null) {
		throw new SpelEvaluationException(
				getStartPosition(), SpelMessage.NO_BEAN_RESOLVER_REGISTERED, this.beanName);
	}

	try {
		return new TypedValue(beanResolver.resolve(state.getEvaluationContext(), this.beanName));
	}
	catch (AccessException ex) {
		throw new SpelEvaluationException(getStartPosition(), ex, SpelMessage.EXCEPTION_DURING_BEAN_RESOLUTION,
			this.beanName, ex.getMessage());
	}
}
 

@Override
public TypedValue getValueInternal(ExpressionState state) throws EvaluationException {
	BeanResolver beanResolver = state.getEvaluationContext().getBeanResolver();
	if (beanResolver == null) {
		throw new SpelEvaluationException(
				getStartPosition(), SpelMessage.NO_BEAN_RESOLVER_REGISTERED, this.beanName);
	}

	try {
		return new TypedValue(beanResolver.resolve(state.getEvaluationContext(), this.beanName));
	}
	catch (AccessException ex) {
		throw new SpelEvaluationException(getStartPosition(), ex, SpelMessage.EXCEPTION_DURING_BEAN_RESOLUTION,
			this.beanName, ex.getMessage());
	}
}
 

@Override
@Nullable
public Object getValue() throws EvaluationException {
	if (this.compiledAst != null) {
		try {
			EvaluationContext context = getEvaluationContext();
			return this.compiledAst.getValue(context.getRootObject().getValue(), context);
		}
		catch (Throwable ex) {
			// If running in mixed mode, revert to interpreted
			if (this.configuration.getCompilerMode() == SpelCompilerMode.MIXED) {
				this.interpretedCount = 0;
				this.compiledAst = null;
			}
			else {
				// Running in SpelCompilerMode.immediate mode - propagate exception to caller
				throw new SpelEvaluationException(ex, SpelMessage.EXCEPTION_RUNNING_COMPILED_EXPRESSION);
			}
		}
	}

	ExpressionState expressionState = new ExpressionState(getEvaluationContext(), this.configuration);
	Object result = this.ast.getValue(expressionState);
	checkCompile(expressionState);
	return result;
}
 

@Override
public Object getValue(EvaluationContext context, Object rootObject) throws EvaluationException {
	Assert.notNull(context, "EvaluationContext is required");

	if (this.compiledAst != null) {
		try {
			return this.compiledAst.getValue(rootObject,context);
		}
		catch (Throwable ex) {
			// If running in mixed mode, revert to interpreted
			if (this.configuration.getCompilerMode() == SpelCompilerMode.MIXED) {
				this.interpretedCount = 0;
				this.compiledAst = null;
			}
			else {
				// Running in SpelCompilerMode.immediate mode - propagate exception to caller
				throw new SpelEvaluationException(ex, SpelMessage.EXCEPTION_RUNNING_COMPILED_EXPRESSION);
			}
		}
	}

	ExpressionState expressionState = new ExpressionState(context, toTypedValue(rootObject), this.configuration);
	Object result = this.ast.getValue(expressionState);
	checkCompile(expressionState);
	return result;
}
 

@Override
@Nullable
public Object getValue(Object rootObject) throws EvaluationException {
	if (this.compiledAst != null) {
		try {
			return this.compiledAst.getValue(rootObject, getEvaluationContext());
		}
		catch (Throwable ex) {
			// If running in mixed mode, revert to interpreted
			if (this.configuration.getCompilerMode() == SpelCompilerMode.MIXED) {
				this.interpretedCount.set(0);
				this.compiledAst = null;
			}
			else {
				// Running in SpelCompilerMode.immediate mode - propagate exception to caller
				throw new SpelEvaluationException(ex, SpelMessage.EXCEPTION_RUNNING_COMPILED_EXPRESSION);
			}
		}
	}

	ExpressionState expressionState =
			new ExpressionState(getEvaluationContext(), toTypedValue(rootObject), this.configuration);
	Object result = this.ast.getValue(expressionState);
	checkCompile(expressionState);
	return result;
}
 

@SuppressWarnings("unchecked")
@Override
@Nullable
public <T> T getValue(EvaluationContext context, @Nullable Class<T> expectedResultType) throws EvaluationException {
	Assert.notNull(context, "EvaluationContext is required");

	if (this.compiledAst != null) {
		try {
			Object result = this.compiledAst.getValue(context.getRootObject().getValue(), context);
			if (expectedResultType != null) {
				return ExpressionUtils.convertTypedValue(context, new TypedValue(result), expectedResultType);
			}
			else {
				return (T) result;
			}
		}
		catch (Throwable ex) {
			// If running in mixed mode, revert to interpreted
			if (this.configuration.getCompilerMode() == SpelCompilerMode.MIXED) {
				this.interpretedCount.set(0);
				this.compiledAst = null;
			}
			else {
				// Running in SpelCompilerMode.immediate mode - propagate exception to caller
				throw new SpelEvaluationException(ex, SpelMessage.EXCEPTION_RUNNING_COMPILED_EXPRESSION);
			}
		}
	}

	ExpressionState expressionState = new ExpressionState(context, this.configuration);
	TypedValue typedResultValue = this.ast.getTypedValue(expressionState);
	checkCompile(expressionState);
	return ExpressionUtils.convertTypedValue(context, typedResultValue, expectedResultType);
}
 

@SuppressWarnings("unchecked")
@Override
@Nullable
public <T> T getValue(@Nullable Class<T> expectedResultType) throws EvaluationException {
	if (this.compiledAst != null) {
		try {
			EvaluationContext context = getEvaluationContext();
			Object result = this.compiledAst.getValue(context.getRootObject().getValue(), context);
			if (expectedResultType == null) {
				return (T) result;
			}
			else {
				return ExpressionUtils.convertTypedValue(
						getEvaluationContext(), new TypedValue(result), expectedResultType);
			}
		}
		catch (Throwable ex) {
			// If running in mixed mode, revert to interpreted
			if (this.configuration.getCompilerMode() == SpelCompilerMode.MIXED) {
				this.interpretedCount.set(0);
				this.compiledAst = null;
			}
			else {
				// Running in SpelCompilerMode.immediate mode - propagate exception to caller
				throw new SpelEvaluationException(ex, SpelMessage.EXCEPTION_RUNNING_COMPILED_EXPRESSION);
			}
		}
	}

	ExpressionState expressionState = new ExpressionState(getEvaluationContext(), this.configuration);
	TypedValue typedResultValue = this.ast.getTypedValue(expressionState);
	checkCompile(expressionState);
	return ExpressionUtils.convertTypedValue(
			expressionState.getEvaluationContext(), typedResultValue, expectedResultType);
}
 

@Override
@Nullable
public TypeDescriptor getValueTypeDescriptor(Object rootObject) throws EvaluationException {
	ExpressionState expressionState =
			new ExpressionState(getEvaluationContext(), toTypedValue(rootObject), this.configuration);
	return this.ast.getValueInternal(expressionState).getTypeDescriptor();
}
 

/**
 * Evaluate the condition and if true evaluate the first alternative, otherwise
 * evaluate the second alternative.
 * @param state the expression state
 * @throws EvaluationException if the condition does not evaluate correctly to
 * a boolean or there is a problem executing the chosen alternative
 */
@Override
public TypedValue getValueInternal(ExpressionState state) throws EvaluationException {
	Boolean value = this.children[0].getValue(state, Boolean.class);
	if (value == null) {
		throw new SpelEvaluationException(getChild(0).getStartPosition(),
				SpelMessage.TYPE_CONVERSION_ERROR, "null", "boolean");
	}
	TypedValue result = this.children[value ? 1 : 2].getValueInternal(state);
	computeExitTypeDescriptor();
	return result;
}
 

@SuppressWarnings("unchecked")
@Override
@Nullable
public <T> T getValue(EvaluationContext context, Object rootObject, @Nullable Class<T> expectedResultType)
		throws EvaluationException {

	Assert.notNull(context, "EvaluationContext is required");

	if (this.compiledAst != null) {
		try {
			Object result = this.compiledAst.getValue(rootObject, context);
			if (expectedResultType != null) {
				return ExpressionUtils.convertTypedValue(context, new TypedValue(result), expectedResultType);
			}
			else {
				return (T) result;
			}
		}
		catch (Throwable ex) {
			// If running in mixed mode, revert to interpreted
			if (this.configuration.getCompilerMode() == SpelCompilerMode.MIXED) {
				this.interpretedCount.set(0);
				this.compiledAst = null;
			}
			else {
				// Running in SpelCompilerMode.immediate mode - propagate exception to caller
				throw new SpelEvaluationException(ex, SpelMessage.EXCEPTION_RUNNING_COMPILED_EXPRESSION);
			}
		}
	}

	ExpressionState expressionState = new ExpressionState(context, toTypedValue(rootObject), this.configuration);
	TypedValue typedResultValue = this.ast.getTypedValue(expressionState);
	checkCompile(expressionState);
	return ExpressionUtils.convertTypedValue(context, typedResultValue, expectedResultType);
}
 

@Override
public BooleanTypedValue getValueInternal(ExpressionState state) throws EvaluationException {
	Object left = getLeftOperand().getValueInternal(state).getValue();
	Object right = getRightOperand().getValueInternal(state).getValue();
	this.leftActualDescriptor = CodeFlow.toDescriptorFromObject(left);
	this.rightActualDescriptor = CodeFlow.toDescriptorFromObject(right);
	return BooleanTypedValue.forValue(equalityCheck(state.getEvaluationContext(), left, right));
}
 

@Override
@Nullable
public Object getValue(EvaluationContext context) throws EvaluationException {
	Assert.notNull(context, "EvaluationContext is required");

	if (this.compiledAst != null) {
		try {
			return this.compiledAst.getValue(context.getRootObject().getValue(), context);
		}
		catch (Throwable ex) {
			// If running in mixed mode, revert to interpreted
			if (this.configuration.getCompilerMode() == SpelCompilerMode.MIXED) {
				this.interpretedCount.set(0);
				this.compiledAst = null;
			}
			else {
				// Running in SpelCompilerMode.immediate mode - propagate exception to caller
				throw new SpelEvaluationException(ex, SpelMessage.EXCEPTION_RUNNING_COMPILED_EXPRESSION);
			}
		}
	}

	ExpressionState expressionState = new ExpressionState(context, this.configuration);
	Object result = this.ast.getValue(expressionState);
	checkCompile(expressionState);
	return result;
}
 

/**
 * Evaluates a compound expression. This involves evaluating each piece in turn and the
 * return value from each piece is the active context object for the subsequent piece.
 * @param state the state in which the expression is being evaluated
 * @return the final value from the last piece of the compound expression
 */
@Override
public TypedValue getValueInternal(ExpressionState state) throws EvaluationException {
	ValueRef ref = getValueRef(state);
	TypedValue result = ref.getValue();
	this.exitTypeDescriptor = this.children[this.children.length - 1].exitTypeDescriptor;
	return result;
}
 

@Override
public BooleanTypedValue getValueInternal(ExpressionState state) throws EvaluationException {
	Object left = getLeftOperand().getValueInternal(state).getValue();
	Object right = getRightOperand().getValueInternal(state).getValue();
	this.leftActualDescriptor = CodeFlow.toDescriptorFromObject(left);
	this.rightActualDescriptor = CodeFlow.toDescriptorFromObject(right);
	return BooleanTypedValue.forValue(
			equalityCheck(state.getEvaluationContext(), left, right));
}
 

private Object[] getArguments(ExpressionState state) {
	Object[] arguments = new Object[getChildCount()];
	for (int i = 0; i < arguments.length; i++) {
		// Make the root object the active context again for evaluating the parameter expressions
		try {
			state.pushActiveContextObject(state.getScopeRootContextObject());
			arguments[i] = this.children[i].getValueInternal(state).getValue();
		}
		finally {
			state.popActiveContextObject();
		}
	}
	return arguments;
}
 

/**
 * Convert operand value to string using registered converter or using
 * {@code toString} method.
 * @param value typed value to be converted
 * @param state expression state
 * @return {@code TypedValue} instance converted to {@code String}
 */
private static String convertTypedValueToString(TypedValue value, ExpressionState state) {
	TypeConverter typeConverter = state.getEvaluationContext().getTypeConverter();
	TypeDescriptor typeDescriptor = TypeDescriptor.valueOf(String.class);
	if (typeConverter.canConvert(value.getTypeDescriptor(), typeDescriptor)) {
		return String.valueOf(typeConverter.convertValue(value.getValue(),
				value.getTypeDescriptor(), typeDescriptor));
	}
	return String.valueOf(value.getValue());
}
 

private void populateShortArray(ExpressionState state, Object newArray, TypeConverter typeConverter,
		InlineList initializer) {

	short[] newShortArray = (short[]) newArray;
	for (int i = 0; i < newShortArray.length; i++) {
		TypedValue typedValue = initializer.getChild(i).getTypedValue(state);
		newShortArray[i] = ExpressionUtils.toShort(typeConverter, typedValue);
	}
}
 

@Override
public Object getValue(EvaluationContext context) throws EvaluationException {
	Assert.notNull(context, "EvaluationContext is required");

	if (this.compiledAst != null) {
		try {
			TypedValue contextRoot = context.getRootObject();
			return this.compiledAst.getValue(contextRoot.getValue(), context);
		}
		catch (Throwable ex) {
			// If running in mixed mode, revert to interpreted
			if (this.configuration.getCompilerMode() == SpelCompilerMode.MIXED) {
				this.interpretedCount = 0;
				this.compiledAst = null;
			}
			else {
				// Running in SpelCompilerMode.immediate mode - propagate exception to caller
				throw new SpelEvaluationException(ex, SpelMessage.EXCEPTION_RUNNING_COMPILED_EXPRESSION);
			}
		}
	}

	ExpressionState expressionState = new ExpressionState(context, this.configuration);
	Object result = this.ast.getValue(expressionState);
	checkCompile(expressionState);
	return result;
}
 

@Override
public BooleanTypedValue getValueInternal(ExpressionState state) throws EvaluationException {
	try {
		Boolean value = this.children[0].getValue(state, Boolean.class);
		if (value == null) {
			throw new SpelEvaluationException(SpelMessage.TYPE_CONVERSION_ERROR, "null", "boolean");
		}
		return BooleanTypedValue.forValue(!value);
	}
	catch (SpelEvaluationException ex) {
		ex.setPosition(getChild(0).getStartPosition());
		throw ex;
	}
}
 

/**
 * Evaluate the condition and if not null, return it.
 * If it is null, return the other value.
 * @param state the expression state
 * @throws EvaluationException if the condition does not evaluate correctly
 * to a boolean or there is a problem executing the chosen alternative
 */
@Override
public TypedValue getValueInternal(ExpressionState state) throws EvaluationException {
	TypedValue value = this.children[0].getValueInternal(state);
	// If this check is changed, the generateCode method will need changing too
	if (!StringUtils.isEmpty(value.getValue())) {
		return value;
	}
	else {
		TypedValue result = this.children[1].getValueInternal(state);
		computeExitTypeDescriptor();
		return result;
	}
}
 

@Override
public TypedValue getValueInternal(ExpressionState state) throws EvaluationException {
	TypedValue tv = getValueInternal(state.getActiveContextObject(), state.getEvaluationContext(),
			state.getConfiguration().isAutoGrowNullReferences());
	PropertyAccessor accessorToUse = this.cachedReadAccessor;
	if (accessorToUse instanceof CompilablePropertyAccessor) {
		CompilablePropertyAccessor accessor = (CompilablePropertyAccessor) accessorToUse;
		setExitTypeDescriptor(CodeFlow.toDescriptor(accessor.getPropertyType()));
	}
	return tv;
}
 

/**
 * Evaluate the condition and if true evaluate the first alternative, otherwise
 * evaluate the second alternative.
 * @param state the expression state
 * @throws EvaluationException if the condition does not evaluate correctly to
 * a boolean or there is a problem executing the chosen alternative
 */
@Override
public TypedValue getValueInternal(ExpressionState state) throws EvaluationException {
	Boolean value = this.children[0].getValue(state, Boolean.class);
	if (value == null) {
		throw new SpelEvaluationException(getChild(0).getStartPosition(),
				SpelMessage.TYPE_CONVERSION_ERROR, "null", "boolean");
	}
	TypedValue result = this.children[value ? 1 : 2].getValueInternal(state);
	computeExitTypeDescriptor();
	return result;
}
 

/**
 * Compute the arguments to the function, they are the children of this expression node.
 * @return an array of argument values for the function call
 */
private Object[] getArguments(ExpressionState state) throws EvaluationException {
	// Compute arguments to the function
	Object[] arguments = new Object[getChildCount()];
	for (int i = 0; i < arguments.length; i++) {
		arguments[i] = this.children[i].getValueInternal(state).getValue();
	}
	return arguments;
}
 

@Override
public BooleanTypedValue getValueInternal(ExpressionState state) throws EvaluationException {
	Object leftValue = getLeftOperand().getValueInternal(state).getValue();
	Object rightValue = getRightOperand().getValueInternal(state).getValue();
	this.leftActualDescriptor = CodeFlow.toDescriptorFromObject(leftValue);
	this.rightActualDescriptor = CodeFlow.toDescriptorFromObject(rightValue);
	return BooleanTypedValue.forValue(!equalityCheck(state.getEvaluationContext(), leftValue, rightValue));
}
 

private boolean getBooleanValue(ExpressionState state, SpelNodeImpl operand) {
	try {
		Boolean value = operand.getValue(state, Boolean.class);
		assertValueNotNull(value);
		return value;
	}
	catch (SpelEvaluationException ex) {
		ex.setPosition(operand.getStartPosition());
		throw ex;
	}
}