/*
* Copyright 2014 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.gwt.dev.util;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
/**
* An ObjectInputStream that interns all deserialized strings.
*/
public class StringInterningObjectInputStream extends ObjectInputStream {
public static final int MAX_INTERNED_STRING_SIZE = 2048;
public StringInterningObjectInputStream(InputStream inputStream) throws IOException {
super(inputStream);
enableResolveObject(true);
}
@Override
protected Object resolveObject(Object obj) throws IOException {
Object resolvedObject = super.resolveObject(obj);
if (resolvedObject instanceof String &&
((String) resolvedObject).length() < MAX_INTERNED_STRING_SIZE) {
return StringInterner.get().intern((String) resolvedObject);
}
return resolvedObject;
}
}