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// Protocol Buffers - Google's data interchange format

// Copyright 2008 Google Inc.  All rights reserved.

// http://code.google.com/p/protobuf/

//

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

//

//     * Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

//     * Redistributions in binary form must reproduce the above

// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

//     * Neither the name of Google Inc. nor the names of its

// contributors may be used to endorse or promote products derived from

// this software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

package com.google.protobuf;

import java.util.AbstractList;

import java.util.RandomAccess;

import java.util.ListIterator;

import java.util.Iterator;

/**

 * An implementation of {@link LazyStringList} that wraps another

 * {@link LazyStringList} such that it cannot be modified via the wrapper.

 *

 * @author jonp@google.com (Jon Perlow)

 */

public class UnmodifiableLazyStringList extends AbstractList<String>

    implements LazyStringList, RandomAccess {

  private final LazyStringList list;

  public UnmodifiableLazyStringList(LazyStringList list) {

    this.list = list;

  }

  @Override

  public String get(int index) {

    return list.get(index);

  }

  @Override

  public int size() {

    return list.size();

  }

  //@Override (Java 1.6 override semantics, but we must support 1.5)

  public ByteString getByteString(int index) {

    return list.getByteString(index);

  }

  //@Override (Java 1.6 override semantics, but we must support 1.5)

  public void add(ByteString element) {

    throw new UnsupportedOperationException();

  }

  //@Override (Java 1.6 override semantics, but we must support 1.5)

  public ListIterator<String> listIterator(final int index) {

    return new ListIterator<String>() {

      ListIterator<String> iter = list.listIterator(index);

      //@Override (Java 1.6 override semantics, but we must support 1.5)

      public boolean hasNext() {

        return iter.hasNext();

      }

      //@Override (Java 1.6 override semantics, but we must support 1.5)

      public String next() {

        return iter.next();

      }

      //@Override (Java 1.6 override semantics, but we must support 1.5)

      public boolean hasPrevious() {

        return iter.hasPrevious();

      }

      //@Override (Java 1.6 override semantics, but we must support 1.5)

      public String previous() {

        return iter.previous();

      }

      //@Override (Java 1.6 override semantics, but we must support 1.5)

      public int nextIndex() {

        return iter.nextIndex();

      }

      //@Override (Java 1.6 override semantics, but we must support 1.5)

      public int previousIndex() {

        return iter.previousIndex();

      }

      //@Override (Java 1.6 override semantics, but we must support 1.5)

      public void remove() {

        throw new UnsupportedOperationException();

      }

      //@Override (Java 1.6 override semantics, but we must support 1.5)

      public void set(String o) {

        throw new UnsupportedOperationException();

      }

      //@Override (Java 1.6 override semantics, but we must support 1.5)

      public void add(String o) {

        throw new UnsupportedOperationException();

      }

    };

  }

  @Override

  public Iterator<String> iterator() {

    return new Iterator<String>() {

      Iterator<String> iter = list.iterator();

      //@Override (Java 1.6 override semantics, but we must support 1.5)

      public boolean hasNext() {

        return iter.hasNext();

      }

      //@Override (Java 1.6 override semantics, but we must support 1.5)

      public String next() {

        return iter.next();

      }

      //@Override (Java 1.6 override semantics, but we must support 1.5)

      public void remove() {

        throw new UnsupportedOperationException();

      }

    };

  }

}