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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /mobile/android/thirdparty/ch/boye/httpclientandroidlib/protocol/ChainBuilder.java
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'mobile/android/thirdparty/ch/boye/httpclientandroidlib/protocol/ChainBuilder.java')
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diff --git a/mobile/android/thirdparty/ch/boye/httpclientandroidlib/protocol/ChainBuilder.java b/mobile/android/thirdparty/ch/boye/httpclientandroidlib/protocol/ChainBuilder.java
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+/*
+ * ====================================================================
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation. For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+
+package ch.boye.httpclientandroidlib.protocol;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.Map;
+
+import ch.boye.httpclientandroidlib.annotation.NotThreadSafe;
+
+/**
+ * Builder class to build a linked list (chain) of unique class instances. Each class can have
+ * only one instance in the list. Useful for building lists of protocol interceptors.
+ *
+ * @see ImmutableHttpProcessor
+ *
+ * @since 4.3
+ */
+@NotThreadSafe
+final class ChainBuilder<E> {
+
+ private final LinkedList<E> list;
+ private final Map<Class<?>, E> uniqueClasses;
+
+ public ChainBuilder() {
+ this.list = new LinkedList<E>();
+ this.uniqueClasses = new HashMap<Class<?>, E>();
+ }
+
+ private void ensureUnique(final E e) {
+ final E previous = this.uniqueClasses.remove(e.getClass());
+ if (previous != null) {
+ this.list.remove(previous);
+ }
+ this.uniqueClasses.put(e.getClass(), e);
+ }
+
+ public ChainBuilder<E> addFirst(final E e) {
+ if (e == null) {
+ return this;
+ }
+ ensureUnique(e);
+ this.list.addFirst(e);
+ return this;
+ }
+
+ public ChainBuilder<E> addLast(final E e) {
+ if (e == null) {
+ return this;
+ }
+ ensureUnique(e);
+ this.list.addLast(e);
+ return this;
+ }
+
+ public ChainBuilder<E> addAllFirst(final Collection<E> c) {
+ if (c == null) {
+ return this;
+ }
+ for (final E e: c) {
+ addFirst(e);
+ }
+ return this;
+ }
+
+ public ChainBuilder<E> addAllFirst(final E... c) {
+ if (c == null) {
+ return this;
+ }
+ for (final E e: c) {
+ addFirst(e);
+ }
+ return this;
+ }
+
+ public ChainBuilder<E> addAllLast(final Collection<E> c) {
+ if (c == null) {
+ return this;
+ }
+ for (final E e: c) {
+ addLast(e);
+ }
+ return this;
+ }
+
+ public ChainBuilder<E> addAllLast(final E... c) {
+ if (c == null) {
+ return this;
+ }
+ for (final E e: c) {
+ addLast(e);
+ }
+ return this;
+ }
+
+ public LinkedList<E> build() {
+ return new LinkedList<E>(this.list);
+ }
+
+}