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/*
* Copyright 2010 Google Inc.
*
* 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 com.google.web.bindery.autobean.shared;
import com.google.web.bindery.autobean.shared.impl.StringQuoter;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
/**
* Provides unified encoding and decoding of value objects.
*/
public class ValueCodex {
enum Type {
BIG_DECIMAL(BigDecimal.class) {
@Override
public boolean canUpcast(Object value) {
return value instanceof BigDecimal;
}
@Override
public BigDecimal decode(Class clazz, Splittable value) {
return new BigDecimal(value.asString());
}
@Override
public Splittable encode(Object value) {
return StringQuoter.create(((BigDecimal) value).toString());
}
},
BIG_INTEGER(BigInteger.class) {
@Override
public boolean canUpcast(Object value) {
return value instanceof BigInteger;
}
@Override
public BigInteger decode(Class clazz, Splittable value) {
return new BigInteger(value.asString());
}
@Override
public Splittable encode(Object value) {
return StringQuoter.create(((BigInteger) value).toString());
}
},
BOOLEAN(Boolean.class, boolean.class, false) {
@Override
public Boolean decode(Class clazz, Splittable value) {
return value.asBoolean();
}
@Override
public Splittable encode(Object value) {
return StringQuoter.create((Boolean) value);
}
},
BYTE(Byte.class, byte.class, (byte) 0) {
@Override
public Byte decode(Class clazz, Splittable value) {
return (byte) value.asNumber();
}
@Override
public Splittable encode(Object value) {
return StringQuoter.create((Byte) value);
}
},
CHARACTER(Character.class, char.class, (char) 0) {
@Override
public Character decode(Class clazz, Splittable value) {
return value.asString().charAt(0);
}
@Override
public Splittable encode(Object value) {
return StringQuoter.create(String.valueOf((Character) value));
}
},
DATE(Date.class) {
@Override
public boolean canUpcast(Object value) {
return value instanceof Date;
}
@Override
public Date decode(Class clazz, Splittable value) {
return StringQuoter.tryParseDate(value.asString());
}
@Override
public Splittable encode(Object value) {
return StringQuoter.create(String.valueOf(((Date) value).getTime()));
}
},
DOUBLE(Double.class, double.class, 0d) {
@Override
public Double decode(Class clazz, Splittable value) {
return value.asNumber();
}
@Override
public Splittable encode(Object value) {
return StringQuoter.create((Double) value);
}
},
ENUM(Enum.class) {
@Override
public Enum decode(Class clazz, Splittable value) {
return (Enum) clazz.getEnumConstants()[(int) value.asNumber()];
}
@Override
public Splittable encode(Object value) {
return StringQuoter.create(((Enum) value).ordinal());
}
},
FLOAT(Float.class, float.class, 0f) {
@Override
public Float decode(Class clazz, Splittable value) {
return (float) value.asNumber();
}
@Override
public Splittable encode(Object value) {
return StringQuoter.create((Float) value);
}
},
INTEGER(Integer.class, int.class, 0) {
@Override
public Integer decode(Class clazz, Splittable value) {
return Integer.valueOf((int) value.asNumber());
}
@Override
public Splittable encode(Object value) {
return StringQuoter.create((Integer) value);
}
},
LONG(Long.class, long.class, 0L) {
@Override
public Long decode(Class clazz, Splittable value) {
return Long.parseLong(value.asString());
}
@Override
public Splittable encode(Object value) {
return StringQuoter.create(String.valueOf((Long) value));
}
},
SHORT(Short.class, short.class, (short) 0) {
@Override
public Short decode(Class clazz, Splittable value) {
return (short) value.asNumber();
}
@Override
public Splittable encode(Object value) {
return StringQuoter.create((Short) value);
}
},
STRING(String.class) {
@Override
public String decode(Class clazz, Splittable value) {
return value.asString();
}
@Override
public Splittable encode(Object value) {
return StringQuoter.create((String) value);
}
},
SPLITTABLE(Splittable.class) {
@Override
public Splittable decode(Class clazz, Splittable value) {
return value;
}
@Override
public Splittable encode(Object value) {
return (Splittable) value;
}
},
VOID(Void.class, void.class, null) {
@Override
public Void decode(Class clazz, Splittable value) {
return null;
}
@Override
public Splittable encode(Object value) {
return null;
}
};
private final Object defaultValue;
private final Class type;
private final Class primitiveType;
Type(Class objectType) {
this(objectType, null, null);
}
Type(Class objectType, Class primitiveType, Object defaultValue) {
this.type = objectType;
this.primitiveType = primitiveType;
this.defaultValue = defaultValue;
}
/**
* Determines whether or not the Type can handle the given value via
* upcasting semantics.
*
* @param value a value Object
*/
public boolean canUpcast(Object value) {
// Most value types are final, so this method is meaningless
return false;
}
public abstract Object decode(Class clazz, Splittable value);
public abstract Splittable encode(Object value);
public Object getDefaultValue() {
return defaultValue;
}
public Class getPrimitiveType() {
return primitiveType;
}
public Class getType() {
return type;
}
}
private static final Set> ALL_VALUE_TYPES;
private static final Map, Type> TYPES_BY_CLASS;
static {
Map, Type> temp = new HashMap, Type>();
for (Type t : Type.values()) {
temp.put(t.getType(), t);
if (t.getPrimitiveType() != null) {
temp.put(t.getPrimitiveType(), t);
}
}
ALL_VALUE_TYPES = Collections.unmodifiableSet(temp.keySet());
TYPES_BY_CLASS = Collections.unmodifiableMap(temp);
}
/**
* Returns true if ValueCodex can operate on values of the given type.
*
* @param clazz a Class object
* @return {@code true} if the given object type can be decoded
*/
public static boolean canDecode(Class clazz) {
if (findType(clazz) != null) {
return true;
}
// Use other platform-specific tests
return ValueCodexHelper.canDecode(clazz);
}
@SuppressWarnings("unchecked")
public static T decode(Class clazz, Splittable split) {
if (split == null || split == Splittable.NULL) {
return null;
}
return (T) getTypeOrDie(clazz).decode(clazz, split);
}
/**
* No callers in GWT codebase.
*
* @deprecated use {@link #decode(Class, Splittable)} instead.
* @throws UnsupportedOperationException
*/
@Deprecated
public static T decode(Class clazz, String string) {
throw new UnsupportedOperationException();
}
/**
* Encode a value object when the wire format type is known. This method
* should be preferred over {@link #encode(Object)} when possible.
*/
public static Splittable encode(Class clazz, Object obj) {
if (obj == null) {
return Splittable.NULL;
}
return getTypeOrDie(clazz).encode(obj);
}
public static Splittable encode(Object obj) {
if (obj == null) {
return Splittable.NULL;
}
Type t = findType(obj.getClass());
// Try upcasting
if (t == null) {
for (Type maybe : Type.values()) {
if (maybe.canUpcast(obj)) {
t = maybe;
break;
}
}
}
if (t == null) {
throw new UnsupportedOperationException(obj.getClass().getName());
}
return t.encode(obj);
}
/**
* Return all Value types that can be processed by the ValueCodex.
*/
public static Set> getAllValueTypes() {
return ALL_VALUE_TYPES;
}
/**
* Returns the uninitialized field value for the given primitive type.
*/
public static Object getUninitializedFieldValue(Class clazz) {
Type type = getTypeOrDie(clazz);
if (clazz.equals(type.getPrimitiveType())) {
return type.getDefaultValue();
}
return null;
}
/**
* May return null.
*/
private static Type findType(Class clazz) {
if (clazz.isEnum()) {
return Type.ENUM;
}
return TYPES_BY_CLASS.get(clazz);
}
private static Type getTypeOrDie(Class clazz) {
Type toReturn = findType(clazz);
if (toReturn == null) {
throw new UnsupportedOperationException(clazz.getName());
}
return toReturn;
}
}
