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package boomerang.util;

import boomerang.scene.Field;
import boomerang.scene.Val;
import com.google.common.collect.Lists;
import java.util.Collection;
import java.util.Set;

public class AccessPath {
  private final Val val;
  private final Collection fieldChain;

  public AccessPath(Val value) {
    this.val = value;
    this.fieldChain = Lists.newArrayList();
  }

  public AccessPath(Val value, Field field) {
    this.val = value;
    this.fieldChain = Lists.newArrayList(field);
  }

  public AccessPath(Val value, Collection fields) {
    this.val = value;
    this.fieldChain = fields;
  }

  @Override
  public String toString() {
    return val.toString()
        + ""
        + (fieldChain.isEmpty() ? "" : fieldChain.toString())
        + (isOverApproximated() ? "*" : "");
  }

  public boolean isOverApproximated() {
    return fieldChain instanceof Set;
  }

  public Val getBase() {
    return this.val;
  }

  public Collection getFields() {
    return fieldChain;
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((fieldChain == null) ? 0 : fieldChain.hashCode());
    result = prime * result + ((val == null) ? 0 : val.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null) {
      return false;
    }
    if (getClass() != obj.getClass()) {
      return false;
    }
    AccessPath other = (AccessPath) obj;
    if (fieldChain == null) {
      if (other.fieldChain != null) {
        return false;
      }
    } else if (!fieldChain.equals(other.fieldChain)) {
      return false;
    }
    if (val == null) {
      if (other.val != null) {
        return false;
      }
    } else if (!val.equals(other.val)) {
      return false;
    }
    return true;
  }
}