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/* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.xmlbeans.impl.jam;
/**
* Represents a member value of a JAnnotation.
*
* A note regarding enums
*
* The presence of metadata of 'enum' types poses a bit of a challenge
* in the untyped view of metadata that is presented by JAnnotationValue.
* Because JAM cannot assume that the enum definitions have been compiled,
* it is not possible for JAM to return an instance of an enumuerated type.
* In other words, it is not possible for JAnnotationValue to provide an
* asEnum() method.
*
* If JAM encounters an annotation value of an enumerated type, it will
* represent it with a JAnnotationValue such that calling
* myAnnotationValue.getType().isEnumType() will return true.
* Moreover, calling myAnnotationValue.asString() will return
* the name of the enumeration field, exactly as it appears in the
* type declaration.
*
*
* @author Patrick Calahan
*/
public interface JAnnotationValue {
//docme
public String getName();
//docme
public JClass getType();
/**
* If this member is complex (i.e. an instance of another annotation
* type), this method returns a representation of the annotation instance.
* Returns null in all other samples. This method always returns null if the
* annotation is a javdoc tag, as such tags only support one level of
* nesting.
*/
public JAnnotation asAnnotation();
/**
* Returns the value of this member as a JClass. Returns null if the
* value cannot be understood as a class name or if the type of the member
* is known to be something other than java.lang.Class.
*/
public JClass asClass();
/**
* Returns the String value of the annotation. If the value is
* known to be a simple, non-array type other than String, it will be
* converted in a resonable manner (with an appropriate toString() or
* String.valueOf() method). If the value is known to be complex or is an
* array, this method will return null.
*
* If no type information is available for the annotation member (i.e.
* it's a javadoc tag), then the raw textual value of the member is
* returned.
*/
public String asString();
/**
* Returns the member's value as an int. If the value is not known to be
* an int, (because it's a javadoc tag or because it's a 175 annotation
* member of a type other than int) asString() is called. If the result is
* null, NumberFormatException is thrown. Otherwise, the String is
* converted to an int with Integer.valueOf(), which again may throw
* NumberFormatException.
*/
public int asInt() throws NumberFormatException;
/**
* Returns the member's value as a boolean. If necessary, type
* conversion is performed in a similar manner as described for
* asInt(), except that IllegalArgumentException is
* thrown instead of NumberFormatException.
*/
public boolean asBoolean() throws IllegalArgumentException;
/**
* Returns the member's value as a long. If necessary, type
* conversion is performed in a similar manner as described for
* asInt().
*/
public long asLong() throws NumberFormatException;
/**
* Returns the member's value as a short. If necessary, type
* conversion is performed in a similar manner as described for
* asInt().
*/
public short asShort() throws NumberFormatException;
/**
* Returns the member's value as a double. If necessary, type
* conversion is performed in a similar manner as described for
* asInt().
*/
public double asDouble() throws NumberFormatException;
/**
* Returns the member's value as a float. If necessary, type
* conversion is performed in a similar manner as described for
* asInt().
*/
public float asFloat() throws NumberFormatException;
/**
* Returns the member's value as a byte. If necessary, type
* conversion is performed in a similar manner as described for
* asInt().
*/
public byte asByte() throws NumberFormatException;
/**
* Returns the member's value as a char. If necessary, type
* conversion is performed by calling getStringValue(). If the result
* is null or is a String that is not exactly of length 1,
* IllegalArgumentException is thrown.
*/
public char asChar() throws IllegalArgumentException;
/**
* If this member is known to be of an array type, returns the value
* as an array of Objects. If the array component type is primitive,
* the array objects will be instances of an appropriate java.lang
* wrapper (e.g., Integer). Returns null if the member type is
* not an array.
*
* This method always returns null for javadoc tags.
*/
//public Object[] asArray();
/**
* If this member is known to be an array of classes, returns an
* array of JClass representations of those classes. If the memeber
* is known to be an array of a simple non-array type, this method
* will call asStringArray() and attempt to return a JClass
* by treating each string in the returned array as a qualified classname.
* Returns null otherwise.
*
*
* This method always returns null for javadoc tags.
*/
public JClass[] asClassArray();
/**
* If this member is known to be an array of annotations (i.e.
* complex, nested types), this method returns an array containing
* each complex value as a JAnnotation. Returns null in all other samples.
*
*
* This method always returns null for javadoc tags.
*/
public JAnnotation[] asAnnotationArray();
/**
* Returns this member's value as an array of Strings. If this member is
* not of an array type, or is an array of arrays or complex annotations,
* this method returns null. If it is an array of a simple, non-array type
* other than String, conversion on each component will be attempted as
* described under getStringValue().
*
* This method always returns null for javadoc tags.
*/
public String[] asStringArray();
/**
* Returns this member's value as an array of ints. If this member is
* not of an array type, or is an array of arrays or complex annotations,
* this method returns null. If it is an array of a simple, non-array type
* other than int, conversion on each component will be attempted as
* described under getIntValue().
*
* This method always returns null for javadoc tags.
*/
public int[] asIntArray() throws NumberFormatException;
/**
* Returns this member's value as an array of booleans. If necessary,
* type conversion is performed in a similar manner as described for
* asIntArray(), except that IllegalArgumentException may be
* thrown instead of NumberFormatException.
*
* This method always returns null for javadoc tags.
*/
public boolean[] asBooleanArray() throws IllegalArgumentException;
/**
* Returns this member's value as an array of shorts. If necessary,
* type conversion is performed in a similar manner as described for
* asIntArray().
*
*
This method always returns null for javadoc tags.
*/
public short[] asShortArray() throws NumberFormatException;
/**
* Returns this member's value as an array of longs. If necessary,
* type conversion is performed in a similar manner as described for
* asIntArray().
*
*
This method always returns null for javadoc tags.
*/
public long[] asLongArray() throws NumberFormatException;
/**
* Returns this member's value as an array of doubles. If necessary,
* type conversion is performed in a similar manner as described for
* asIntArray().
*
*
This method always returns null for javadoc tags.
*/
public double[] asDoubleArray() throws NumberFormatException;
/**
* Returns this member's value as an array of floats. If necessary,
* type conversion is performed in a similar manner as described for
* asIntArray().
*
*
This method always returns null for javadoc tags.
*/
public float[] asFloatArray() throws NumberFormatException;
/**
* Returns this member's value as an array of bytes. If necessary,
* type conversion is performed in a similar manner as described for
* asIntArray().
*
*
This method always returns null for javadoc tags.
*/
public byte[] asByteArray() throws NumberFormatException;
/**
* Returns this member's value as an array of bytes. If necessary,
* type conversion is performed in a similar manner as described for
* asIntArray() and asChar()..
*
*
This method always returns null for javadoc tags.
*/
public char[] asCharArray() throws IllegalArgumentException;
/**
* Returns true if the member's value was not explicitly set in the
* annotation instance but was instead taken from the member definition's
* default.
*
* Note that not all JAM implementations may be able to distinguish
* the case where the value is explicitly declared to be the same value
* as the member's default from the case where the value is not declared
* and the value is implicitly default. In this event, this method
* will return true if and only if the effective value of the annotation
* is the same as the default value (regardless of how that value was
* declared).
*/
public boolean isDefaultValueUsed();
//return the 175 type accessor method?
//public JMethod getAccessor();
/**
* @deprecated DO NOT CALL THIS METHOD. IT WILL BE REMOVED SOON. This
* method is a bad thing because it forces/allows the caller to make
* assumptions about how the annotation value is actually represented
* in the underlying implementation. Please use a combination
* of getType() and the various as...() methods instead.
*/
public Object getValue();
}