com.google.api.client.util.DataMap Maven / Gradle / Ivy
Show all versions of google-http-client Show documentation
/*
* Copyright (c) 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.api.client.util;
import java.util.AbstractMap;
import java.util.AbstractSet;
import java.util.Iterator;
import java.util.Locale;
import java.util.Map;
import java.util.NoSuchElementException;
/**
* Map that uses {@link ClassInfo} to parse the key/value pairs into a map for use in {@link
* Data#mapOf(Object)}.
*
* @author Yaniv Inbar
*/
final class DataMap extends AbstractMap {
// TODO(yanivi): implement more methods for faster implementation!
/** Object being reflected. */
final Object object;
/** Object's class info. */
final ClassInfo classInfo;
/** @param object object being reflected */
DataMap(Object object, boolean ignoreCase) {
this.object = object;
classInfo = ClassInfo.of(object.getClass(), ignoreCase);
}
@Override
public EntrySet entrySet() {
return new EntrySet();
}
@Override
public boolean containsKey(Object key) {
return get(key) != null;
}
@Override
public Object get(Object key) {
if (!(key instanceof String)) {
return null;
}
FieldInfo fieldInfo = classInfo.getFieldInfo((String) key);
if (fieldInfo == null) {
return null;
}
return fieldInfo.getValue(object);
}
@Override
public Object put(String key, Object value) {
FieldInfo fieldInfo = classInfo.getFieldInfo(key);
Preconditions.checkNotNull(fieldInfo, "no field of key " + key);
Object oldValue = fieldInfo.getValue(object);
fieldInfo.setValue(object, Preconditions.checkNotNull(value));
return oldValue;
}
/** Set of object data key/value map entries. */
final class EntrySet extends AbstractSet> {
@Override
public EntryIterator iterator() {
return new EntryIterator();
}
@Override
public int size() {
int result = 0;
for (String name : classInfo.names) {
if (classInfo.getFieldInfo(name).getValue(object) != null) {
result++;
}
}
return result;
}
@Override
public void clear() {
for (String name : classInfo.names) {
classInfo.getFieldInfo(name).setValue(object, null);
}
}
@Override
public boolean isEmpty() {
for (String name : classInfo.names) {
if (classInfo.getFieldInfo(name).getValue(object) != null) {
return false;
}
}
return true;
}
}
/** Iterator over the object data key/value map entries. */
final class EntryIterator implements Iterator> {
/**
* Next index into key names array computed in {@link #hasNext()} or {@code -1} before {@link
* #hasNext()} has been called.
*/
private int nextKeyIndex = -1;
/**
* Next field info computed in {@link #hasNext()} or {@code null} before {@link #hasNext()} has
* been called since the last {@link #next()}.
*/
private FieldInfo nextFieldInfo;
/**
* Next field value computed in {@link #hasNext()} or {@code null} before {@link #hasNext()} has
* been called since the last {@link #next()}.
*/
private Object nextFieldValue;
/** Whether {@link #remove()} has been called since last time {@link #next()} was called. */
private boolean isRemoved;
/** Whether the next field has been computed. */
private boolean isComputed;
/**
* Current field info found by {@link #next()} or {@code null} before {@link #next()} has been
* called.
*/
private FieldInfo currentFieldInfo;
public boolean hasNext() {
if (!isComputed) {
isComputed = true;
nextFieldValue = null;
while (nextFieldValue == null && ++nextKeyIndex < classInfo.names.size()) {
nextFieldInfo = classInfo.getFieldInfo(classInfo.names.get(nextKeyIndex));
nextFieldValue = nextFieldInfo.getValue(object);
}
}
return nextFieldValue != null;
}
public Map.Entry next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
currentFieldInfo = nextFieldInfo;
Object currentFieldValue = nextFieldValue;
isComputed = false;
isRemoved = false;
nextFieldInfo = null;
nextFieldValue = null;
return new Entry(currentFieldInfo, currentFieldValue);
}
public void remove() {
Preconditions.checkState(currentFieldInfo != null && !isRemoved);
isRemoved = true;
currentFieldInfo.setValue(object, null);
}
}
/**
* Entry in the reflection map.
*
* Null key or value is not allowed.
*/
final class Entry implements Map.Entry {
/**
* Current field value, possibly modified only by {@link #setValue(Object)}. As specified {@link
* java.util.Map.Entry}, behavior is undefined if the field value is modified by other means.
*/
private Object fieldValue;
/** Field info. */
private final FieldInfo fieldInfo;
Entry(FieldInfo fieldInfo, Object fieldValue) {
this.fieldInfo = fieldInfo;
this.fieldValue = Preconditions.checkNotNull(fieldValue);
}
public String getKey() {
String result = fieldInfo.getName();
if (classInfo.getIgnoreCase()) {
result = result.toLowerCase(Locale.US);
}
return result;
}
public Object getValue() {
return fieldValue;
}
public Object setValue(Object value) {
Object oldValue = fieldValue;
fieldValue = Preconditions.checkNotNull(value);
fieldInfo.setValue(object, value);
return oldValue;
}
@Override
public int hashCode() {
return getKey().hashCode() ^ getValue().hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof Map.Entry)) {
return false;
}
Map.Entry other = (Map.Entry) obj;
return getKey().equals(other.getKey()) && getValue().equals(other.getValue());
}
}
}