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 * Copyright (c) 1996, 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package java.beans;

import java.lang.ref.Reference;
import java.lang.reflect.Method;
import java.lang.reflect.Constructor;
import java.util.Map.Entry;

import com.sun.beans.introspect.PropertyInfo;
import sun.reflect.misc.ReflectUtil;

A PropertyDescriptor describes one property that a Java Bean
exports via a pair of accessor methods.
Since:
1.1/**
 * A PropertyDescriptor describes one property that a Java Bean
 * exports via a pair of accessor methods.
 * @since 1.1
 */
public class PropertyDescriptor extends FeatureDescriptor {

    private Reference<? extends Class<?>> propertyTypeRef;
    private final MethodRef readMethodRef = new MethodRef();
    private final MethodRef writeMethodRef = new MethodRef();
    private Reference<? extends Class<?>> propertyEditorClassRef;

    private boolean bound;
    private boolean constrained;

    // The base name of the method name which will be prefixed with the
    // read and write method. If name == "foo" then the baseName is "Foo"
    private String baseName;

    private String writeMethodName;
    private String readMethodName;

    
Constructs a PropertyDescriptor for a property that follows
the standard Java convention by having getFoo and setFoo
accessor methods.  Thus if the argument name is "fred", it will
assume that the writer method is "setFred" and the reader method
is "getFred" (or "isFred" for a boolean property).  Note that the
property name should start with a lower case character, which will
be capitalized in the method names.
Params:
propertyName – The programmatic name of the property.
beanClass – The Class object for the target bean.  For
         example sun.beans.OurButton.class.
Throws:
IntrospectionException – if an exception occurs during
             introspection./**
     * Constructs a PropertyDescriptor for a property that follows
     * the standard Java convention by having getFoo and setFoo
     * accessor methods.  Thus if the argument name is "fred", it will
     * assume that the writer method is "setFred" and the reader method
     * is "getFred" (or "isFred" for a boolean property).  Note that the
     * property name should start with a lower case character, which will
     * be capitalized in the method names.
     *
     * @param propertyName The programmatic name of the property.
     * @param beanClass The Class object for the target bean.  For
     *          example sun.beans.OurButton.class.
     * @exception IntrospectionException if an exception occurs during
     *              introspection.
     */
    public PropertyDescriptor(String propertyName, Class<?> beanClass)
                throws IntrospectionException {
        this(propertyName, beanClass,
                Introspector.IS_PREFIX + NameGenerator.capitalize(propertyName),
                Introspector.SET_PREFIX + NameGenerator.capitalize(propertyName));
    }

    
This constructor takes the name of a simple property, and method
names for reading and writing the property.
Params:
propertyName – The programmatic name of the property.
beanClass – The Class object for the target bean.  For
         example sun.beans.OurButton.class.
readMethodName – The name of the method used for reading the property
          value.  May be null if the property is write-only.
writeMethodName – The name of the method used for writing the property
          value.  May be null if the property is read-only.
Throws:
IntrospectionException – if an exception occurs during
             introspection./**
     * This constructor takes the name of a simple property, and method
     * names for reading and writing the property.
     *
     * @param propertyName The programmatic name of the property.
     * @param beanClass The Class object for the target bean.  For
     *          example sun.beans.OurButton.class.
     * @param readMethodName The name of the method used for reading the property
     *           value.  May be null if the property is write-only.
     * @param writeMethodName The name of the method used for writing the property
     *           value.  May be null if the property is read-only.
     * @exception IntrospectionException if an exception occurs during
     *              introspection.
     */
    public PropertyDescriptor(String propertyName, Class<?> beanClass,
                String readMethodName, String writeMethodName)
                throws IntrospectionException {
        if (beanClass == null) {
            throw new IntrospectionException("Target Bean class is null");
        }
        if (propertyName == null || propertyName.length() == 0) {
            throw new IntrospectionException("bad property name");
        }
        if ("".equals(readMethodName) || "".equals(writeMethodName)) {
            throw new IntrospectionException("read or write method name should not be the empty string");
        }
        setName(propertyName);
        setClass0(beanClass);

        this.readMethodName = readMethodName;
        if (readMethodName != null && getReadMethod() == null) {
            throw new IntrospectionException("Method not found: " + readMethodName);
        }
        this.writeMethodName = writeMethodName;
        if (writeMethodName != null && getWriteMethod() == null) {
            throw new IntrospectionException("Method not found: " + writeMethodName);
        }
        // If this class or one of its base classes allow PropertyChangeListener,
        // then we assume that any properties we discover are "bound".
        // See Introspector.getTargetPropertyInfo() method.
        Class<?>[] args = { PropertyChangeListener.class };
        this.bound = null != Introspector.findMethod(beanClass, "addPropertyChangeListener", args.length, args);
    }

    
This constructor takes the name of a simple property, and Method
objects for reading and writing the property.
Params:
propertyName – The programmatic name of the property.
readMethod – The method used for reading the property value.
         May be null if the property is write-only.
writeMethod – The method used for writing the property value.
         May be null if the property is read-only.
Throws:
IntrospectionException – if an exception occurs during
             introspection./**
     * This constructor takes the name of a simple property, and Method
     * objects for reading and writing the property.
     *
     * @param propertyName The programmatic name of the property.
     * @param readMethod The method used for reading the property value.
     *          May be null if the property is write-only.
     * @param writeMethod The method used for writing the property value.
     *          May be null if the property is read-only.
     * @exception IntrospectionException if an exception occurs during
     *              introspection.
     */
    public PropertyDescriptor(String propertyName, Method readMethod, Method writeMethod)
                throws IntrospectionException {
        if (propertyName == null || propertyName.length() == 0) {
            throw new IntrospectionException("bad property name");
        }
        setName(propertyName);
        setReadMethod(readMethod);
        setWriteMethod(writeMethod);
    }

    
Creates PropertyDescriptor from the specified property info. 
Params:
entry –  the pair of values, where the key is the base name of the property (the rest of the method name) and the value is the automatically generated property info
bound –  the flag indicating whether it is possible to treat this property as a bound property
Since:
9/**
     * Creates {@code PropertyDescriptor} from the specified property info.
     *
     * @param entry  the pair of values,
     *               where the {@code key} is the base name of the property (the rest of the method name)
     *               and the {@code value} is the automatically generated property info
     * @param bound  the flag indicating whether it is possible to treat this property as a bound property
     *
     * @since 9
     */
    PropertyDescriptor(Entry<String,PropertyInfo> entry, boolean bound) {
        String base = entry.getKey();
        PropertyInfo info = entry.getValue();
        setName(Introspector.decapitalize(base));
        setReadMethod0(info.getReadMethod());
        setWriteMethod0(info.getWriteMethod());
        setPropertyType(info.getPropertyType());
        setConstrained(info.isConstrained());
        setBound(bound && info.is(PropertyInfo.Name.bound));

        boolean isExpert = info.is(PropertyInfo.Name.expert);
        setValue(PropertyInfo.Name.expert.name(), isExpert); // compatibility
        setExpert(isExpert);

        boolean isHidden = info.is(PropertyInfo.Name.hidden);
        setValue(PropertyInfo.Name.hidden.name(), isHidden); // compatibility
        setHidden(isHidden);

        setPreferred(info.is(PropertyInfo.Name.preferred));

        boolean isRequired = info.is(PropertyInfo.Name.required);
        setValue(PropertyInfo.Name.required.name(), isRequired);

        boolean visual = info.is(PropertyInfo.Name.visualUpdate);
        setValue(PropertyInfo.Name.visualUpdate.name(), visual);

        Object description = info.get(PropertyInfo.Name.description);
        if (description != null) {
            setShortDescription(description.toString());
        }
        Object values = info.get(PropertyInfo.Name.enumerationValues);
        if (values == null) {
            values = new Object[0];
        }
        setValue(PropertyInfo.Name.enumerationValues.name(), values);
        this.baseName = base;
    }

    
Returns the Java type info for the property. Note that the Class object may describe primitive Java types such as int. This type is returned by the read method or is used as the parameter type of the write method. Returns null if the type is an indexed property that does not support non-indexed access. 
Returns:
the Class object that represents the Java type info, or null if the type cannot be determined/**
     * Returns the Java type info for the property.
     * Note that the {@code Class} object may describe
     * primitive Java types such as {@code int}.
     * This type is returned by the read method
     * or is used as the parameter type of the write method.
     * Returns {@code null} if the type is an indexed property
     * that does not support non-indexed access.
     *
     * @return the {@code Class} object that represents the Java type info,
     *         or {@code null} if the type cannot be determined
     */
    public synchronized Class<?> getPropertyType() {
        Class<?> type = getPropertyType0();
        if (type  == null) {
            try {
                type = findPropertyType(getReadMethod(), getWriteMethod());
                setPropertyType(type);
            } catch (IntrospectionException ex) {
                // Fall
            }
        }
        return type;
    }

    private void setPropertyType(Class<?> type) {
        this.propertyTypeRef = getWeakReference(type);
    }

    private Class<?> getPropertyType0() {
        return (this.propertyTypeRef != null)
                ? this.propertyTypeRef.get()
                : null;
    }

    
Gets the method that should be used to read the property value.
Returns:
The method that should be used to read the property value.
May return null if the property can't be read./**
     * Gets the method that should be used to read the property value.
     *
     * @return The method that should be used to read the property value.
     * May return null if the property can't be read.
     */
    public synchronized Method getReadMethod() {
        Method readMethod = this.readMethodRef.get();
        if (readMethod == null) {
            Class<?> cls = getClass0();
            if (cls == null || (readMethodName == null && !this.readMethodRef.isSet())) {
                // The read method was explicitly set to null.
                return null;
            }
            String nextMethodName = Introspector.GET_PREFIX + getBaseName();
            if (readMethodName == null) {
                Class<?> type = getPropertyType0();
                if (type == boolean.class || type == null) {
                    readMethodName = Introspector.IS_PREFIX + getBaseName();
                } else {
                    readMethodName = nextMethodName;
                }
            }

            // Since there can be multiple write methods but only one getter
            // method, find the getter method first so that you know what the
            // property type is.  For booleans, there can be "is" and "get"
            // methods.  If an "is" method exists, this is the official
            // reader method so look for this one first.
            readMethod = Introspector.findMethod(cls, readMethodName, 0);
            if ((readMethod == null) && !readMethodName.equals(nextMethodName)) {
                readMethodName = nextMethodName;
                readMethod = Introspector.findMethod(cls, readMethodName, 0);
            }
            try {
                setReadMethod(readMethod);
            } catch (IntrospectionException ex) {
                // fall
            }
        }
        return readMethod;
    }

    
Sets the method that should be used to read the property value.
Params:
readMethod – The new read method.
Throws:
IntrospectionException – if the read method is invalid
Since:
1.2/**
     * Sets the method that should be used to read the property value.
     *
     * @param readMethod The new read method.
     * @throws IntrospectionException if the read method is invalid
     * @since 1.2
     */
    public synchronized void setReadMethod(Method readMethod)
                                throws IntrospectionException {
        // The property type is determined by the read method.
        setPropertyType(findPropertyType(readMethod, this.writeMethodRef.get()));
        setReadMethod0(readMethod);
    }

    private void setReadMethod0(Method readMethod) {
        this.readMethodRef.set(readMethod);
        if (readMethod == null) {
            readMethodName = null;
            return;
        }
        setClass0(readMethod.getDeclaringClass());

        readMethodName = readMethod.getName();
        setTransient(readMethod.getAnnotation(Transient.class));
    }

    
Gets the method that should be used to write the property value.
Returns:
The method that should be used to write the property value.
May return null if the property can't be written./**
     * Gets the method that should be used to write the property value.
     *
     * @return The method that should be used to write the property value.
     * May return null if the property can't be written.
     */
    public synchronized Method getWriteMethod() {
        Method writeMethod = this.writeMethodRef.get();
        if (writeMethod == null) {
            Class<?> cls = getClass0();
            if (cls == null || (writeMethodName == null && !this.writeMethodRef.isSet())) {
                // The write method was explicitly set to null.
                return null;
            }

            // We need the type to fetch the correct method.
            Class<?> type = getPropertyType0();
            if (type == null) {
                try {
                    // Can't use getPropertyType since it will lead to recursive loop.
                    type = findPropertyType(getReadMethod(), null);
                    setPropertyType(type);
                } catch (IntrospectionException ex) {
                    // Without the correct property type we can't be guaranteed
                    // to find the correct method.
                    return null;
                }
            }

            if (writeMethodName == null) {
                writeMethodName = Introspector.SET_PREFIX + getBaseName();
            }

            Class<?>[] args = (type == null) ? null : new Class<?>[] { type };
            writeMethod = Introspector.findMethod(cls, writeMethodName, 1, args);
            if (writeMethod != null) {
                if (!writeMethod.getReturnType().equals(void.class)) {
                    writeMethod = null;
                }
            }
            try {
                setWriteMethod(writeMethod);
            } catch (IntrospectionException ex) {
                // fall through
            }
        }
        return writeMethod;
    }

    
Sets the method that should be used to write the property value.
Params:
writeMethod – The new write method.
Throws:
IntrospectionException – if the write method is invalid
Since:
1.2/**
     * Sets the method that should be used to write the property value.
     *
     * @param writeMethod The new write method.
     * @throws IntrospectionException if the write method is invalid
     * @since 1.2
     */
    public synchronized void setWriteMethod(Method writeMethod)
                                throws IntrospectionException {
        // Set the property type - which validates the method
        setPropertyType(findPropertyType(getReadMethod(), writeMethod));
        setWriteMethod0(writeMethod);
    }

    private void setWriteMethod0(Method writeMethod) {
        this.writeMethodRef.set(writeMethod);
        if (writeMethod == null) {
            writeMethodName = null;
            return;
        }
        setClass0(writeMethod.getDeclaringClass());

        writeMethodName = writeMethod.getName();
        setTransient(writeMethod.getAnnotation(Transient.class));
    }

    
Overridden to ensure that a super class doesn't take precedent
/**
     * Overridden to ensure that a super class doesn't take precedent
     */
    void setClass0(Class<?> clz) {
        if (getClass0() != null && clz.isAssignableFrom(getClass0())) {
            // don't replace a subclass with a superclass
            return;
        }
        super.setClass0(clz);
    }

    
Updates to "bound" properties will cause a "PropertyChange" event to
get fired when the property is changed.
Returns:
True if this is a bound property./**
     * Updates to "bound" properties will cause a "PropertyChange" event to
     * get fired when the property is changed.
     *
     * @return True if this is a bound property.
     */
    public boolean isBound() {
        return bound;
    }

    
Updates to "bound" properties will cause a "PropertyChange" event to
get fired when the property is changed.
Params:
bound – True if this is a bound property./**
     * Updates to "bound" properties will cause a "PropertyChange" event to
     * get fired when the property is changed.
     *
     * @param bound True if this is a bound property.
     */
    public void setBound(boolean bound) {
        this.bound = bound;
    }

    
Attempted updates to "Constrained" properties will cause a "VetoableChange"
event to get fired when the property is changed.
Returns:
True if this is a constrained property./**
     * Attempted updates to "Constrained" properties will cause a "VetoableChange"
     * event to get fired when the property is changed.
     *
     * @return True if this is a constrained property.
     */
    public boolean isConstrained() {
        return constrained;
    }

    
Attempted updates to "Constrained" properties will cause a "VetoableChange"
event to get fired when the property is changed.
Params:
constrained – True if this is a constrained property./**
     * Attempted updates to "Constrained" properties will cause a "VetoableChange"
     * event to get fired when the property is changed.
     *
     * @param constrained True if this is a constrained property.
     */
    public void setConstrained(boolean constrained) {
        this.constrained = constrained;
    }


    
Normally PropertyEditors will be found using the PropertyEditorManager.
However if for some reason you want to associate a particular
PropertyEditor with a given property, then you can do it with
this method.
Params:
propertyEditorClass –  The Class for the desired PropertyEditor./**
     * Normally PropertyEditors will be found using the PropertyEditorManager.
     * However if for some reason you want to associate a particular
     * PropertyEditor with a given property, then you can do it with
     * this method.
     *
     * @param propertyEditorClass  The Class for the desired PropertyEditor.
     */
    public void setPropertyEditorClass(Class<?> propertyEditorClass) {
        this.propertyEditorClassRef = getWeakReference(propertyEditorClass);
    }

    
Gets any explicit PropertyEditor Class that has been registered
for this property.
Returns:
Any explicit PropertyEditor Class that has been registered
         for this property.  Normally this will return "null",
         indicating that no special editor has been registered,
         so the PropertyEditorManager should be used to locate
         a suitable PropertyEditor./**
     * Gets any explicit PropertyEditor Class that has been registered
     * for this property.
     *
     * @return Any explicit PropertyEditor Class that has been registered
     *          for this property.  Normally this will return "null",
     *          indicating that no special editor has been registered,
     *          so the PropertyEditorManager should be used to locate
     *          a suitable PropertyEditor.
     */
    public Class<?> getPropertyEditorClass() {
        return (this.propertyEditorClassRef != null)
                ? this.propertyEditorClassRef.get()
                : null;
    }

    
Constructs an instance of a property editor using the current
property editor class.

If the property editor class has a public constructor that takes an
Object argument then it will be invoked using the bean parameter
as the argument. Otherwise, the default constructor will be invoked.
Params:
bean – the source object
Returns:
a property editor instance or null if a property editor has
        not been defined or cannot be created
Since:
1.5/**
     * Constructs an instance of a property editor using the current
     * property editor class.
     * <p>
     * If the property editor class has a public constructor that takes an
     * Object argument then it will be invoked using the bean parameter
     * as the argument. Otherwise, the default constructor will be invoked.
     *
     * @param bean the source object
     * @return a property editor instance or null if a property editor has
     *         not been defined or cannot be created
     * @since 1.5
     */
    @SuppressWarnings("deprecation")
    public PropertyEditor createPropertyEditor(Object bean) {
        Object editor = null;

        final Class<?> cls = getPropertyEditorClass();
        if (cls != null && PropertyEditor.class.isAssignableFrom(cls)
                && ReflectUtil.isPackageAccessible(cls)) {
            Constructor<?> ctor = null;
            if (bean != null) {
                try {
                    ctor = cls.getConstructor(new Class<?>[] { Object.class });
                } catch (Exception ex) {
                    // Fall through
                }
            }
            try {
                if (ctor == null) {
                    editor = cls.newInstance();
                } else {
                    editor = ctor.newInstance(new Object[] { bean });
                }
            } catch (Exception ex) {
                // Fall through
            }
        }
        return (PropertyEditor)editor;
    }


    
Compares this PropertyDescriptor against the specified object. Returns true if the objects are the same. Two PropertyDescriptors are the same if the read, write, property types, property editor and flags are equivalent. 
Since:
1.4/**
     * Compares this {@code PropertyDescriptor} against the specified object.
     * Returns true if the objects are the same. Two {@code PropertyDescriptor}s
     * are the same if the read, write, property types, property editor and
     * flags  are equivalent.
     *
     * @since 1.4
     */
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj != null && obj instanceof PropertyDescriptor) {
            PropertyDescriptor other = (PropertyDescriptor)obj;
            Method otherReadMethod = other.getReadMethod();
            Method otherWriteMethod = other.getWriteMethod();

            if (!compareMethods(getReadMethod(), otherReadMethod)) {
                return false;
            }

            if (!compareMethods(getWriteMethod(), otherWriteMethod)) {
                return false;
            }

            if (getPropertyType() == other.getPropertyType() &&
                getPropertyEditorClass() == other.getPropertyEditorClass() &&
                bound == other.isBound() && constrained == other.isConstrained() &&
                writeMethodName == other.writeMethodName &&
                readMethodName == other.readMethodName) {
                return true;
            }
        }
        return false;
    }

    
Package private helper method for Descriptor .equals methods.
Params:
a – first method to compare
b – second method to compare
Returns:
boolean to indicate that the methods are equivalent/**
     * Package private helper method for Descriptor .equals methods.
     *
     * @param a first method to compare
     * @param b second method to compare
     * @return boolean to indicate that the methods are equivalent
     */
    boolean compareMethods(Method a, Method b) {
        // Note: perhaps this should be a protected method in FeatureDescriptor
        if ((a == null) != (b == null)) {
            return false;
        }

        if (a != null && b != null) {
            if (!a.equals(b)) {
                return false;
            }
        }
        return true;
    }

    
Package-private constructor.
Merge two property descriptors.  Where they conflict, give the
second argument (y) priority over the first argument (x).
Params:
x –  The first (lower priority) PropertyDescriptor
y –  The second (higher priority) PropertyDescriptor/**
     * Package-private constructor.
     * Merge two property descriptors.  Where they conflict, give the
     * second argument (y) priority over the first argument (x).
     *
     * @param x  The first (lower priority) PropertyDescriptor
     * @param y  The second (higher priority) PropertyDescriptor
     */
    PropertyDescriptor(PropertyDescriptor x, PropertyDescriptor y) {
        super(x,y);

        if (y.baseName != null) {
            baseName = y.baseName;
        } else {
            baseName = x.baseName;
        }

        if (y.readMethodName != null) {
            readMethodName = y.readMethodName;
        } else {
            readMethodName = x.readMethodName;
        }

        if (y.writeMethodName != null) {
            writeMethodName = y.writeMethodName;
        } else {
            writeMethodName = x.writeMethodName;
        }

        if (y.propertyTypeRef != null) {
            propertyTypeRef = y.propertyTypeRef;
        } else {
            propertyTypeRef = x.propertyTypeRef;
        }

        // Figure out the merged read method.
        Method xr = x.getReadMethod();
        Method yr = y.getReadMethod();

        // Normally give priority to y's readMethod.
        try {
            if (isAssignable(xr, yr)) {
                setReadMethod(yr);
            } else {
                setReadMethod(xr);
            }
        } catch (IntrospectionException ex) {
            // fall through
        }

        // However, if both x and y reference read methods in the same class,
        // give priority to a boolean "is" method over a boolean "get" method.
        if (xr != null && yr != null &&
                   xr.getDeclaringClass() == yr.getDeclaringClass() &&
                   getReturnType(getClass0(), xr) == boolean.class &&
                   getReturnType(getClass0(), yr) == boolean.class &&
                   xr.getName().indexOf(Introspector.IS_PREFIX) == 0 &&
                   yr.getName().indexOf(Introspector.GET_PREFIX) == 0) {
            try {
                setReadMethod(xr);
            } catch (IntrospectionException ex) {
                // fall through
            }
        }

        Method xw = x.getWriteMethod();
        Method yw = y.getWriteMethod();

        try {
            if (yw != null) {
                setWriteMethod(yw);
            } else {
                setWriteMethod(xw);
            }
        } catch (IntrospectionException ex) {
            // Fall through
        }

        if (y.getPropertyEditorClass() != null) {
            setPropertyEditorClass(y.getPropertyEditorClass());
        } else {
            setPropertyEditorClass(x.getPropertyEditorClass());
        }


        bound = x.bound | y.bound;
        constrained = x.constrained | y.constrained;
    }

    /*
     * Package-private dup constructor.
     * This must isolate the new object from any changes to the old object.
     */
    PropertyDescriptor(PropertyDescriptor old) {
        super(old);
        propertyTypeRef = old.propertyTypeRef;
        this.readMethodRef.set(old.readMethodRef.get());
        this.writeMethodRef.set(old.writeMethodRef.get());
        propertyEditorClassRef = old.propertyEditorClassRef;

        writeMethodName = old.writeMethodName;
        readMethodName = old.readMethodName;
        baseName = old.baseName;

        bound = old.bound;
        constrained = old.constrained;
    }

    void updateGenericsFor(Class<?> type) {
        setClass0(type);
        try {
            setPropertyType(findPropertyType(this.readMethodRef.get(), this.writeMethodRef.get()));
        }
        catch (IntrospectionException exception) {
            setPropertyType(null);
        }
    }

    
Returns the property type that corresponds to the read and write method.
The type precedence is given to the readMethod.
Throws:
IntrospectionException – if the read or write method is invalid
Returns:
the type of the property descriptor or null if both
        read and write methods are null./**
     * Returns the property type that corresponds to the read and write method.
     * The type precedence is given to the readMethod.
     *
     * @return the type of the property descriptor or null if both
     *         read and write methods are null.
     * @throws IntrospectionException if the read or write method is invalid
     */
    private Class<?> findPropertyType(Method readMethod, Method writeMethod)
        throws IntrospectionException {
        Class<?> propertyType = null;
        try {
            if (readMethod != null) {
                Class<?>[] params = getParameterTypes(getClass0(), readMethod);
                if (params.length != 0) {
                    throw new IntrospectionException("bad read method arg count: "
                                                     + readMethod);
                }
                propertyType = getReturnType(getClass0(), readMethod);
                if (propertyType == Void.TYPE) {
                    throw new IntrospectionException("read method " +
                                        readMethod.getName() + " returns void");
                }
            }
            if (writeMethod != null) {
                Class<?>[] params = getParameterTypes(getClass0(), writeMethod);
                if (params.length != 1) {
                    throw new IntrospectionException("bad write method arg count: "
                                                     + writeMethod);
                }
                if (propertyType != null && !params[0].isAssignableFrom(propertyType)) {
                    throw new IntrospectionException("type mismatch between read and write methods");
                }
                propertyType = params[0];
            }
        } catch (IntrospectionException ex) {
            throw ex;
        }
        return propertyType;
    }


    
Returns a hash code value for the object. See Object.hashCode for a complete description. 
Returns:
a hash code value for this object.
Since:
1.5/**
     * Returns a hash code value for the object.
     * See {@link java.lang.Object#hashCode} for a complete description.
     *
     * @return a hash code value for this object.
     * @since 1.5
     */
    public int hashCode() {
        int result = 7;

        result = 37 * result + ((getPropertyType() == null) ? 0 :
                                getPropertyType().hashCode());
        result = 37 * result + ((getReadMethod() == null) ? 0 :
                                getReadMethod().hashCode());
        result = 37 * result + ((getWriteMethod() == null) ? 0 :
                                getWriteMethod().hashCode());
        result = 37 * result + ((getPropertyEditorClass() == null) ? 0 :
                                getPropertyEditorClass().hashCode());
        result = 37 * result + ((writeMethodName == null) ? 0 :
                                writeMethodName.hashCode());
        result = 37 * result + ((readMethodName == null) ? 0 :
                                readMethodName.hashCode());
        result = 37 * result + getName().hashCode();
        result = 37 * result + ((bound == false) ? 0 : 1);
        result = 37 * result + ((constrained == false) ? 0 : 1);

        return result;
    }

    // Calculate once since capitalize() is expensive.
    String getBaseName() {
        if (baseName == null) {
            baseName = NameGenerator.capitalize(getName());
        }
        return baseName;
    }

    void appendTo(StringBuilder sb) {
        appendTo(sb, "bound", this.bound);
        appendTo(sb, "constrained", this.constrained);
        appendTo(sb, "propertyEditorClass", this.propertyEditorClassRef);
        appendTo(sb, "propertyType", this.propertyTypeRef);
        appendTo(sb, "readMethod", this.readMethodRef.get());
        appendTo(sb, "writeMethod", this.writeMethodRef.get());
    }

    boolean isAssignable(Method m1, Method m2) {
        if (m1 == null) {
            return true; // choose second method
        }
        if (m2 == null) {
            return false; // choose first method
        }
        if (!m1.getName().equals(m2.getName())) {
            return true; // choose second method by default
        }
        Class<?> type1 = m1.getDeclaringClass();
        Class<?> type2 = m2.getDeclaringClass();
        if (!type1.isAssignableFrom(type2)) {
            return false; // choose first method: it declared later
        }
        type1 = getReturnType(getClass0(), m1);
        type2 = getReturnType(getClass0(), m2);
        if (!type1.isAssignableFrom(type2)) {
            return false; // choose first method: it overrides return type
        }
        Class<?>[] args1 = getParameterTypes(getClass0(), m1);
        Class<?>[] args2 = getParameterTypes(getClass0(), m2);
        if (args1.length != args2.length) {
            return true; // choose second method by default
        }
        for (int i = 0; i < args1.length; i++) {
            if (!args1[i].isAssignableFrom(args2[i])) {
                return false; // choose first method: it overrides parameter
            }
        }
        return true; // choose second method
    }
}