src/main/java/com/fasterxml/jackson/databind/deser/std/StdValueInstantiator.java - platform/external/jackson-databind - Git at Google

 package com.fasterxml.jackson.databind.deser.std;

 import java.io.IOException;

 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.DeserializationConfig;
 import com.fasterxml.jackson.databind.DeserializationContext;
 import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.JavaType;
 import com.fasterxml.jackson.databind.JsonMappingException;
 import com.fasterxml.jackson.databind.deser.CreatorProperty;
 import com.fasterxml.jackson.databind.deser.SettableBeanProperty;
 import com.fasterxml.jackson.databind.deser.ValueInstantiator;
 import com.fasterxml.jackson.databind.introspect.AnnotatedWithParams;


 /**
  * Default {@link ValueInstantiator} implementation, which supports
  * Creator methods that can be indicated by standard Jackson
  * annotations.
  */
 public class StdValueInstantiator
     extends ValueInstantiator
 {
     /**
      * Type of values that are instantiated; used
      * for error reporting purposes.
      */
     protected final String _valueTypeDesc;

     /**
      * Are we allowed to convert empty Strings to null objects?
      */
     protected final boolean _cfgEmptyStringsAsObjects;

     // // // Default (no-args) construction

     /**
      * Default (no-argument) constructor to use for instantiation
      * (with {@link #createUsingDefault})
      */
     protected AnnotatedWithParams _defaultCreator;

     // // // With-args (property-based) construction

     protected AnnotatedWithParams _withArgsCreator;
     protected CreatorProperty[] _constructorArguments;

     // // // Delegate construction

     protected JavaType _delegateType;
     protected AnnotatedWithParams _delegateCreator;
     protected CreatorProperty[] _delegateArguments;

     // // // Scalar construction

     protected AnnotatedWithParams _fromStringCreator;
     protected AnnotatedWithParams _fromIntCreator;
     protected AnnotatedWithParams _fromLongCreator;
     protected AnnotatedWithParams _fromDoubleCreator;
     protected AnnotatedWithParams _fromBooleanCreator;

     /*
     /**********************************************************
     /* Life-cycle
     /**********************************************************
      */

     public StdValueInstantiator(DeserializationConfig config, Class<?> valueType)
     {
         _cfgEmptyStringsAsObjects = (config == null) ? false
                 : config.isEnabled(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);
         _valueTypeDesc = (valueType == null) ? "UNKNOWN TYPE" : valueType.getName();
     }

     public StdValueInstantiator(DeserializationConfig config, JavaType valueType)
     {
         _cfgEmptyStringsAsObjects = (config == null) ? false
                 : config.isEnabled(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);
         _valueTypeDesc = (valueType == null) ? "UNKNOWN TYPE" : valueType.toString();
     }

     /**
      * Copy-constructor that sub-classes can use when creating new instances
      * by fluent-style construction
      */
     protected StdValueInstantiator(StdValueInstantiator src)
     {
         _cfgEmptyStringsAsObjects = src._cfgEmptyStringsAsObjects;
         _valueTypeDesc = src._valueTypeDesc;

         _defaultCreator = src._defaultCreator;

         _constructorArguments = src._constructorArguments;
         _withArgsCreator = src._withArgsCreator;

         _delegateType = src._delegateType;
         _delegateCreator = src._delegateCreator;
         _delegateArguments = src._delegateArguments;

         _fromStringCreator = src._fromStringCreator;
         _fromIntCreator = src._fromIntCreator;
         _fromLongCreator = src._fromLongCreator;
         _fromDoubleCreator = src._fromDoubleCreator;
         _fromBooleanCreator = src._fromBooleanCreator;
     }

     /**
      * Method for setting properties related to instantiating values
      * from JSON Object. We will choose basically only one approach (out of possible
      * three), and clear other properties
      */
     public void configureFromObjectSettings(AnnotatedWithParams defaultCreator,
             AnnotatedWithParams delegateCreator, JavaType delegateType, CreatorProperty[] delegateArgs,
             AnnotatedWithParams withArgsCreator, CreatorProperty[] constructorArgs)
     {
         _defaultCreator = defaultCreator;
         _delegateCreator = delegateCreator;
         _delegateType = delegateType;
         _delegateArguments = delegateArgs;
         _withArgsCreator = withArgsCreator;
         _constructorArguments = constructorArgs;
     }

     public void configureFromStringCreator(AnnotatedWithParams creator) {
         _fromStringCreator = creator;
     }

     public void configureFromIntCreator(AnnotatedWithParams creator) {
         _fromIntCreator = creator;
     }

     public void configureFromLongCreator(AnnotatedWithParams creator) {
         _fromLongCreator = creator;
     }

     public void configureFromDoubleCreator(AnnotatedWithParams creator) {
         _fromDoubleCreator = creator;
     }

     public void configureFromBooleanCreator(AnnotatedWithParams creator) {
         _fromBooleanCreator = creator;
     }

     /*
     /**********************************************************
     /* Public API implementation; metadata
     /**********************************************************
      */

     @Override
     public String getValueTypeDesc() {
         return _valueTypeDesc;
     }

     @Override
     public boolean canCreateFromString() {
         return (_fromStringCreator != null);
     }

     @Override
     public boolean canCreateFromInt() {
         return (_fromIntCreator != null);
     }

     @Override
     public boolean canCreateFromLong() {
         return (_fromLongCreator != null);
     }

     @Override
     public boolean canCreateFromDouble() {
         return (_fromDoubleCreator != null);
     }

     @Override
     public boolean canCreateFromBoolean() {
         return (_fromBooleanCreator != null);
     }

     @Override
     public boolean canCreateUsingDefault() {
         return (_defaultCreator != null);
     }

     @Override
     public boolean canCreateUsingDelegate() {
         return _delegateType != null;
     }

     @Override
     public boolean canCreateFromObjectWith() {
         return (_withArgsCreator != null);
     }

     @Override
     public JavaType getDelegateType(DeserializationConfig config) {
         return _delegateType;
     }

     @Override
     public SettableBeanProperty[] getFromObjectArguments(DeserializationConfig config) {
         return _constructorArguments;
     }

     /*
     /**********************************************************
     /* Public API implementation; instantiation from JSON Object
     /**********************************************************
      */

     @Override
     public Object createUsingDefault(DeserializationContext ctxt)
         throws IOException, JsonProcessingException
     {
         if (_defaultCreator == null) { // sanity-check; caller should check
             throw new IllegalStateException("No default constructor for "+getValueTypeDesc());
         }
         try {
             return _defaultCreator.call();
         } catch (ExceptionInInitializerError e) {
             throw wrapException(e);
         } catch (Exception e) {
             throw wrapException(e);
         }
     }

     @Override
     public Object createFromObjectWith(DeserializationContext ctxt, Object[] args)
         throws IOException, JsonProcessingException
     {
         if (_withArgsCreator == null) { // sanity-check; caller should check
             throw new IllegalStateException("No with-args constructor for "+getValueTypeDesc());
         }
         try {
             return _withArgsCreator.call(args);
         } catch (ExceptionInInitializerError e) {
             throw wrapException(e);
         } catch (Exception e) {
             throw wrapException(e);
         }
     }

     @Override
     public Object createUsingDelegate(DeserializationContext ctxt, Object delegate)
         throws IOException, JsonProcessingException
     {
         if (_delegateCreator == null) { // sanity-check; caller should check
             throw new IllegalStateException("No delegate constructor for "+getValueTypeDesc());
         }
         try {
             // First simple case: just delegate, no injectables
             if (_delegateArguments == null) {
                 return _delegateCreator.call1(delegate);
             }
             // And then the case with at least one injectable...
             final int len = _delegateArguments.length;
             Object[] args = new Object[len];
             for (int i = 0; i < len; ++i) {
                 CreatorProperty prop = _delegateArguments[i];
                 if (prop == null) { // delegate
                     args[i] = delegate;
                 } else { // nope, injectable:
                     args[i] = ctxt.findInjectableValue(prop.getInjectableValueId(), prop, null);
                 }
             }
             // and then try calling with full set of arguments
             return _delegateCreator.call(args);
         } catch (ExceptionInInitializerError e) {
             throw wrapException(e);
         } catch (Exception e) {
             throw wrapException(e);
         }
     }

     /*
     /**********************************************************
     /* Public API implementation; instantiation from JSON scalars
     /**********************************************************
      */

     @Override
     public Object createFromString(DeserializationContext ctxt, String value)
             throws IOException, JsonProcessingException
     {
         if (_fromStringCreator != null) {
             try {
                 return _fromStringCreator.call1(value);
             } catch (Exception e) {
                 throw wrapException(e);
             } catch (ExceptionInInitializerError e) {
                 throw wrapException(e);
             }
         }
         return _createFromStringFallbacks(ctxt, value);
     }

     @Override
     public Object createFromInt(DeserializationContext ctxt, int value)
             throws IOException, JsonProcessingException
     {
         try {
             // First: "native" int methods work best:
             if (_fromIntCreator != null) {
                 return _fromIntCreator.call1(Integer.valueOf(value));
             }
             // but if not, can do widening conversion
             if (_fromLongCreator != null) {
                 return _fromLongCreator.call1(Long.valueOf(value));
             }
         } catch (Exception e) {
             throw wrapException(e);
         } catch (ExceptionInInitializerError e) {
             throw wrapException(e);
         }
         throw new JsonMappingException("Can not instantiate value of type "+getValueTypeDesc()
                 +" from Integral number; no single-int-arg constructor/factory method");
     }

     @Override
     public Object createFromLong(DeserializationContext ctxt, long value)
             throws IOException, JsonProcessingException
     {
         try {
             if (_fromLongCreator != null) {
                 return _fromLongCreator.call1(Long.valueOf(value));
             }
         } catch (Exception e) {
             throw wrapException(e);
         } catch (ExceptionInInitializerError e) {
             throw wrapException(e);
         }
         throw new JsonMappingException("Can not instantiate value of type "+getValueTypeDesc()
                 +" from Long integral number; no single-long-arg constructor/factory method");
     }

     @Override
     public Object createFromDouble(DeserializationContext ctxt, double value)
             throws IOException, JsonProcessingException
     {
         try {
             if (_fromDoubleCreator != null) {
                 return _fromDoubleCreator.call1(Double.valueOf(value));
             }
         } catch (Exception e) {
             throw wrapException(e);
         } catch (ExceptionInInitializerError e) {
             throw wrapException(e);
         }
         throw new JsonMappingException("Can not instantiate value of type "+getValueTypeDesc()
                 +" from Floating-point number; no one-double/Double-arg constructor/factory method");
     }

     @Override
     public Object createFromBoolean(DeserializationContext ctxt, boolean value)
             throws IOException, JsonProcessingException
     {
         try {
             if (_fromBooleanCreator != null) {
                 return _fromBooleanCreator.call1(Boolean.valueOf(value));
             }
         } catch (Exception e) {
             throw wrapException(e);
         } catch (ExceptionInInitializerError e) {
             throw wrapException(e);
         }
         throw new JsonMappingException("Can not instantiate value of type "+getValueTypeDesc()
                 +" from Boolean value; no single-boolean/Boolean-arg constructor/factory method");
     }

     /*
     /**********************************************************
     /* Extended API: configuration mutators, accessors
     /**********************************************************
      */

     @Override
     public AnnotatedWithParams getDelegateCreator() {
         return _delegateCreator;
     }

     @Override
     public AnnotatedWithParams getDefaultCreator() {
         return _defaultCreator;
     }

     @Override
     public AnnotatedWithParams getWithArgsCreator() {
         return _withArgsCreator;
     }

     /*
     /**********************************************************
     /* Internal methods
     /**********************************************************
      */

     protected Object _createFromStringFallbacks(DeserializationContext ctxt, String value)
             throws IOException, JsonProcessingException
     {
         /* 28-Sep-2011, tatu: Ok this is not clean at all; but since there are legacy
          *   systems that expect conversions in some cases, let's just add a minimal
          *   patch (note: same could conceivably be used for numbers too).
          */
         if (_fromBooleanCreator != null) {
             String str = value.trim();
             if ("true".equals(str)) {
                 return createFromBoolean(ctxt, true);
             }
             if ("false".equals(str)) {
                 return createFromBoolean(ctxt, false);
             }
         }

         // and finally, empty Strings might be accepted as null Object...
         if (_cfgEmptyStringsAsObjects && value.length() == 0) {
             return null;
         }
         throw new JsonMappingException("Can not instantiate value of type "+getValueTypeDesc()
                 +" from String value; no single-String constructor/factory method");
     }

     protected JsonMappingException wrapException(Throwable t)
     {
         while (t.getCause() != null) {
             t = t.getCause();
         }
         if (t instanceof JsonMappingException) {
             return (JsonMappingException) t;
         }
         return new JsonMappingException("Instantiation of "+getValueTypeDesc()+" value failed: "+t.getMessage(), t);
     }
 }
	package com.fasterxml.jackson.databind.deser.std;

	import java.io.IOException;

	import com.fasterxml.jackson.core.JsonProcessingException;
	import com.fasterxml.jackson.databind.DeserializationConfig;
	import com.fasterxml.jackson.databind.DeserializationContext;
	import com.fasterxml.jackson.databind.DeserializationFeature;
	import com.fasterxml.jackson.databind.JavaType;
	import com.fasterxml.jackson.databind.JsonMappingException;
	import com.fasterxml.jackson.databind.deser.CreatorProperty;
	import com.fasterxml.jackson.databind.deser.SettableBeanProperty;
	import com.fasterxml.jackson.databind.deser.ValueInstantiator;
	import com.fasterxml.jackson.databind.introspect.AnnotatedWithParams;


	/**
	* Default {@link ValueInstantiator} implementation, which supports
	* Creator methods that can be indicated by standard Jackson
	* annotations.
	*/
	public class StdValueInstantiator
	extends ValueInstantiator
	{
	/**
	* Type of values that are instantiated; used
	* for error reporting purposes.
	*/
	protected final String _valueTypeDesc;

	/**
	* Are we allowed to convert empty Strings to null objects?
	*/
	protected final boolean _cfgEmptyStringsAsObjects;

	// // // Default (no-args) construction

	/**
	* Default (no-argument) constructor to use for instantiation
	* (with {@link #createUsingDefault})
	*/
	protected AnnotatedWithParams _defaultCreator;

	// // // With-args (property-based) construction

	protected AnnotatedWithParams _withArgsCreator;
	protected CreatorProperty[] _constructorArguments;

	// // // Delegate construction

	protected JavaType _delegateType;
	protected AnnotatedWithParams _delegateCreator;
	protected CreatorProperty[] _delegateArguments;

	// // // Scalar construction

	protected AnnotatedWithParams _fromStringCreator;
	protected AnnotatedWithParams _fromIntCreator;
	protected AnnotatedWithParams _fromLongCreator;
	protected AnnotatedWithParams _fromDoubleCreator;
	protected AnnotatedWithParams _fromBooleanCreator;

	/*
	/**********************************************************
	/* Life-cycle
	/**********************************************************
	*/

	public StdValueInstantiator(DeserializationConfig config, Class<?> valueType)
	{
	_cfgEmptyStringsAsObjects = (config == null) ? false
	: config.isEnabled(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);
	_valueTypeDesc = (valueType == null) ? "UNKNOWN TYPE" : valueType.getName();
	}

	public StdValueInstantiator(DeserializationConfig config, JavaType valueType)
	{
	_cfgEmptyStringsAsObjects = (config == null) ? false
	: config.isEnabled(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);
	_valueTypeDesc = (valueType == null) ? "UNKNOWN TYPE" : valueType.toString();
	}

	/**
	* Copy-constructor that sub-classes can use when creating new instances
	* by fluent-style construction
	*/
	protected StdValueInstantiator(StdValueInstantiator src)
	{
	_cfgEmptyStringsAsObjects = src._cfgEmptyStringsAsObjects;
	_valueTypeDesc = src._valueTypeDesc;

	_defaultCreator = src._defaultCreator;

	_constructorArguments = src._constructorArguments;
	_withArgsCreator = src._withArgsCreator;

	_delegateType = src._delegateType;
	_delegateCreator = src._delegateCreator;
	_delegateArguments = src._delegateArguments;

	_fromStringCreator = src._fromStringCreator;
	_fromIntCreator = src._fromIntCreator;
	_fromLongCreator = src._fromLongCreator;
	_fromDoubleCreator = src._fromDoubleCreator;
	_fromBooleanCreator = src._fromBooleanCreator;
	}

	/**
	* Method for setting properties related to instantiating values
	* from JSON Object. We will choose basically only one approach (out of possible
	* three), and clear other properties
	*/
	public void configureFromObjectSettings(AnnotatedWithParams defaultCreator,
	AnnotatedWithParams delegateCreator, JavaType delegateType, CreatorProperty[] delegateArgs,
	AnnotatedWithParams withArgsCreator, CreatorProperty[] constructorArgs)
	{
	_defaultCreator = defaultCreator;
	_delegateCreator = delegateCreator;
	_delegateType = delegateType;
	_delegateArguments = delegateArgs;
	_withArgsCreator = withArgsCreator;
	_constructorArguments = constructorArgs;
	}

	public void configureFromStringCreator(AnnotatedWithParams creator) {
	_fromStringCreator = creator;
	}

	public void configureFromIntCreator(AnnotatedWithParams creator) {
	_fromIntCreator = creator;
	}

	public void configureFromLongCreator(AnnotatedWithParams creator) {
	_fromLongCreator = creator;
	}

	public void configureFromDoubleCreator(AnnotatedWithParams creator) {
	_fromDoubleCreator = creator;
	}

	public void configureFromBooleanCreator(AnnotatedWithParams creator) {
	_fromBooleanCreator = creator;
	}

	/*
	/**********************************************************
	/* Public API implementation; metadata
	/**********************************************************
	*/

	@Override
	public String getValueTypeDesc() {
	return _valueTypeDesc;
	}

	@Override
	public boolean canCreateFromString() {
	return (_fromStringCreator != null);
	}

	@Override
	public boolean canCreateFromInt() {
	return (_fromIntCreator != null);
	}

	@Override
	public boolean canCreateFromLong() {
	return (_fromLongCreator != null);
	}

	@Override
	public boolean canCreateFromDouble() {
	return (_fromDoubleCreator != null);
	}

	@Override
	public boolean canCreateFromBoolean() {
	return (_fromBooleanCreator != null);
	}

	@Override
	public boolean canCreateUsingDefault() {
	return (_defaultCreator != null);
	}

	@Override
	public boolean canCreateUsingDelegate() {
	return _delegateType != null;
	}

	@Override
	public boolean canCreateFromObjectWith() {
	return (_withArgsCreator != null);
	}

	@Override
	public JavaType getDelegateType(DeserializationConfig config) {
	return _delegateType;
	}

	@Override
	public SettableBeanProperty[] getFromObjectArguments(DeserializationConfig config) {
	return _constructorArguments;
	}

	/*
	/**********************************************************
	/* Public API implementation; instantiation from JSON Object
	/**********************************************************
	*/

	@Override
	public Object createUsingDefault(DeserializationContext ctxt)
	throws IOException, JsonProcessingException
	{
	if (_defaultCreator == null) { // sanity-check; caller should check
	throw new IllegalStateException("No default constructor for "+getValueTypeDesc());
	}
	try {
	return _defaultCreator.call();
	} catch (ExceptionInInitializerError e) {
	throw wrapException(e);
	} catch (Exception e) {
	throw wrapException(e);
	}
	}

	@Override
	public Object createFromObjectWith(DeserializationContext ctxt, Object[] args)
	throws IOException, JsonProcessingException
	{
	if (_withArgsCreator == null) { // sanity-check; caller should check
	throw new IllegalStateException("No with-args constructor for "+getValueTypeDesc());
	}
	try {
	return _withArgsCreator.call(args);
	} catch (ExceptionInInitializerError e) {
	throw wrapException(e);
	} catch (Exception e) {
	throw wrapException(e);
	}
	}

	@Override
	public Object createUsingDelegate(DeserializationContext ctxt, Object delegate)
	throws IOException, JsonProcessingException
	{
	if (_delegateCreator == null) { // sanity-check; caller should check
	throw new IllegalStateException("No delegate constructor for "+getValueTypeDesc());
	}
	try {
	// First simple case: just delegate, no injectables
	if (_delegateArguments == null) {
	return _delegateCreator.call1(delegate);
	}
	// And then the case with at least one injectable...
	final int len = _delegateArguments.length;
	Object[] args = new Object[len];
	for (int i = 0; i < len; ++i) {
	CreatorProperty prop = _delegateArguments[i];
	if (prop == null) { // delegate
	args[i] = delegate;
	} else { // nope, injectable:
	args[i] = ctxt.findInjectableValue(prop.getInjectableValueId(), prop, null);
	}
	}
	// and then try calling with full set of arguments
	return _delegateCreator.call(args);
	} catch (ExceptionInInitializerError e) {
	throw wrapException(e);
	} catch (Exception e) {
	throw wrapException(e);
	}
	}

	/*
	/**********************************************************
	/* Public API implementation; instantiation from JSON scalars
	/**********************************************************
	*/

	@Override
	public Object createFromString(DeserializationContext ctxt, String value)
	throws IOException, JsonProcessingException
	{
	if (_fromStringCreator != null) {
	try {
	return _fromStringCreator.call1(value);
	} catch (Exception e) {
	throw wrapException(e);
	} catch (ExceptionInInitializerError e) {
	throw wrapException(e);
	}
	}
	return _createFromStringFallbacks(ctxt, value);
	}

	@Override
	public Object createFromInt(DeserializationContext ctxt, int value)
	throws IOException, JsonProcessingException
	{
	try {
	// First: "native" int methods work best:
	if (_fromIntCreator != null) {
	return _fromIntCreator.call1(Integer.valueOf(value));
	}
	// but if not, can do widening conversion
	if (_fromLongCreator != null) {
	return _fromLongCreator.call1(Long.valueOf(value));
	}
	} catch (Exception e) {
	throw wrapException(e);
	} catch (ExceptionInInitializerError e) {
	throw wrapException(e);
	}
	throw new JsonMappingException("Can not instantiate value of type "+getValueTypeDesc()
	+" from Integral number; no single-int-arg constructor/factory method");
	}

	@Override
	public Object createFromLong(DeserializationContext ctxt, long value)
	throws IOException, JsonProcessingException
	{
	try {
	if (_fromLongCreator != null) {
	return _fromLongCreator.call1(Long.valueOf(value));
	}
	} catch (Exception e) {
	throw wrapException(e);
	} catch (ExceptionInInitializerError e) {
	throw wrapException(e);
	}
	throw new JsonMappingException("Can not instantiate value of type "+getValueTypeDesc()
	+" from Long integral number; no single-long-arg constructor/factory method");
	}

	@Override
	public Object createFromDouble(DeserializationContext ctxt, double value)
	throws IOException, JsonProcessingException
	{
	try {
	if (_fromDoubleCreator != null) {
	return _fromDoubleCreator.call1(Double.valueOf(value));
	}
	} catch (Exception e) {
	throw wrapException(e);
	} catch (ExceptionInInitializerError e) {
	throw wrapException(e);
	}
	throw new JsonMappingException("Can not instantiate value of type "+getValueTypeDesc()
	+" from Floating-point number; no one-double/Double-arg constructor/factory method");
	}

	@Override
	public Object createFromBoolean(DeserializationContext ctxt, boolean value)
	throws IOException, JsonProcessingException
	{
	try {
	if (_fromBooleanCreator != null) {
	return _fromBooleanCreator.call1(Boolean.valueOf(value));
	}
	} catch (Exception e) {
	throw wrapException(e);
	} catch (ExceptionInInitializerError e) {
	throw wrapException(e);
	}
	throw new JsonMappingException("Can not instantiate value of type "+getValueTypeDesc()
	+" from Boolean value; no single-boolean/Boolean-arg constructor/factory method");
	}

	/*
	/**********************************************************
	/* Extended API: configuration mutators, accessors
	/**********************************************************
	*/

	@Override
	public AnnotatedWithParams getDelegateCreator() {
	return _delegateCreator;
	}

	@Override
	public AnnotatedWithParams getDefaultCreator() {
	return _defaultCreator;
	}

	@Override
	public AnnotatedWithParams getWithArgsCreator() {
	return _withArgsCreator;
	}

	/*
	/**********************************************************
	/* Internal methods
	/**********************************************************
	*/

	protected Object _createFromStringFallbacks(DeserializationContext ctxt, String value)
	throws IOException, JsonProcessingException
	{
	/* 28-Sep-2011, tatu: Ok this is not clean at all; but since there are legacy
	* systems that expect conversions in some cases, let's just add a minimal
	* patch (note: same could conceivably be used for numbers too).
	*/
	if (_fromBooleanCreator != null) {
	String str = value.trim();
	if ("true".equals(str)) {
	return createFromBoolean(ctxt, true);
	}
	if ("false".equals(str)) {
	return createFromBoolean(ctxt, false);
	}
	}

	// and finally, empty Strings might be accepted as null Object...
	if (_cfgEmptyStringsAsObjects && value.length() == 0) {
	return null;
	}
	throw new JsonMappingException("Can not instantiate value of type "+getValueTypeDesc()
	+" from String value; no single-String constructor/factory method");
	}

	protected JsonMappingException wrapException(Throwable t)
	{
	while (t.getCause() != null) {
	t = t.getCause();
	}
	if (t instanceof JsonMappingException) {
	return (JsonMappingException) t;
	}
	return new JsonMappingException("Instantiation of "+getValueTypeDesc()+" value failed: "+t.getMessage(), t);
	}
	}