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/**
 * Copyright (c) 2011, University of Konstanz, Distributed Systems Group All rights reserved.
 *
 * 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 the University of Konstanz 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  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 org.sirix.node.json;

import static com.google.common.base.Preconditions.checkNotNull;
import java.math.BigInteger;
import org.sirix.api.visitor.JsonNodeVisitor;
import org.sirix.api.visitor.VisitResult;
import org.sirix.node.NodeKind;
import org.sirix.node.delegates.NodeDelegate;
import org.sirix.node.delegates.StructNodeDelegate;
import org.sirix.node.delegates.ValueNodeDelegate;
import org.sirix.node.immutable.json.ImmutableStringNode;
import org.sirix.node.interfaces.Node;
import org.sirix.node.interfaces.StructNode;
import org.sirix.node.interfaces.ValueNode;
import org.sirix.node.interfaces.immutable.ImmutableJsonNode;
import org.sirix.node.xml.AbstractStructForwardingNode;
import org.sirix.settings.Constants;

/**
 * JSONStringNode
 *
 * 
 * Node representing a JSON string.
 * 
 */
public final class StringNode extends AbstractStructForwardingNode implements ValueNode, ImmutableJsonNode {

  /** Delegate for common value node information. */
  private final ValueNodeDelegate mValDel;

  /** {@link StructNodeDelegate} reference. */
  private final StructNodeDelegate mStructNodeDel;

  private BigInteger mHash;

  /**
   * Constructor.
   *
   * @param valDel delegate for {@link ValueNode} implementation
   * @param structDel delegate for {@link StructNode} implementation
   */
  public StringNode(final BigInteger hashCode, final ValueNodeDelegate valDel, final StructNodeDelegate structDel) {
    assert hashCode != null;
    mHash = hashCode;
    assert structDel != null;
    mStructNodeDel = structDel;
    assert valDel != null;
    mValDel = valDel;
  }

  /**
   * Constructor.
   *
   * @param valDel delegate for {@link ValueNode} implementation
   * @param structDel delegate for {@link StructNode} implementation
   */
  public StringNode(final ValueNodeDelegate valDel, final StructNodeDelegate structDel) {
    mStructNodeDel = checkNotNull(structDel);
    mValDel = checkNotNull(valDel);
  }

  @Override
  public NodeKind getKind() {
    return NodeKind.STRING_VALUE;
  }

  @Override
  public BigInteger computeHash() {
    BigInteger result = BigInteger.ONE;

    result = BigInteger.valueOf(31).multiply(result).add(mStructNodeDel.getNodeDelegate().computeHash());
    result = BigInteger.valueOf(31).multiply(result).add(mStructNodeDel.computeHash());
    result = BigInteger.valueOf(31).multiply(result).add(mValDel.computeHash());

    return Node.to128BitsAtMaximumBigInteger(result);
  }

  @Override
  public void setHash(final BigInteger hash) {
    mHash = Node.to128BitsAtMaximumBigInteger(hash);
  }

  @Override
  public BigInteger getHash() {
    return mHash;
  }

  @Override
  public byte[] getRawValue() {
    return mValDel.getRawValue();
  }

  @Override
  public void setValue(final byte[] value) {
    mValDel.setValue(value);
  }

  @Override
  public String getValue() {
    return new String(mValDel.getRawValue(), Constants.DEFAULT_ENCODING);
  }

  @Override
  public StructNodeDelegate getStructNodeDelegate() {
    return mStructNodeDel;
  }

  public ValueNodeDelegate getValNodeDelegate() {
    return mValDel;
  }

  @Override
  public VisitResult acceptVisitor(JsonNodeVisitor visitor) {
    return visitor.visit(ImmutableStringNode.of(this));
  }

  @Override
  protected StructNodeDelegate structDelegate() {
    return mStructNodeDel;
  }

  @Override
  protected NodeDelegate delegate() {
    return mStructNodeDel.getNodeDelegate();
  }
}