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Google XML Pages (GXP) is a templating system used to generate XML/SGML markup (most often HTML).
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/*
 * Copyright (C) 2008 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.gxp.compiler.base;

import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import com.google.gxp.compiler.alerts.SourcePosition;
import com.google.gxp.compiler.reparent.Attribute;

import java.util.*;

/**
 * Represents a call that has not (yet) been bound to the {@code Callable} that
 * it calls. {@code UnboundCall}s are converted to {@link BoundCall}s by the
 * {@link com.google.gxp.compiler.bind.Binder Binder}.
 */
public class UnboundCall extends Call {
  private final TemplateName callee;
  private final Expression content;

  public UnboundCall(SourcePosition sourcePosition,
                     String displayName,
                     TemplateName callee,
                     Map attributes,
                     List attrBundles,
                     Expression content) {
    super(sourcePosition, displayName, null /* no schema */, attributes, attrBundles);
    this.callee = Preconditions.checkNotNull(callee);
    this.content = Preconditions.checkNotNull(content);
  }

  public TemplateName getCallee() {
    return callee;
  }

  public Expression getContent() {
    return content;
  }

  @Override
  public Call transformParams(ExhaustiveExpressionVisitor visitor) {
    ImmutableMap.Builder mapBuilder = ImmutableMap.builder();
    for (Map.Entry param : getAttributes().entrySet()) {
      mapBuilder.put(param.getKey(), visitor.visitAttribute(param.getValue()));
    }
    Expression newContent = getContent().acceptVisitor(visitor);
    return withParamsAndContent(mapBuilder.build(), newContent);
  }

  public UnboundCall withParamsAndContent(Map newAttributes,
                                          Expression newContent) {
    return (Objects.equal(getAttributes(), newAttributes)
            && Objects.equal(getContent(), newContent))
        ? this
        : new UnboundCall(getSourcePosition(), getDisplayName(), getCallee(),
                          newAttributes, getAttrBundles(), newContent);
  }

  @Override
  public final  T acceptCallVisitor(CallVisitor visitor) {
    return visitor.visitUnboundCall(this);
  }

  @Override
  public boolean equals(Object that) {
    return this == that
        || (that instanceof UnboundCall && equals((UnboundCall) that));
  }

  public boolean equals(UnboundCall that) {
    return equalsCall(that)
        && Objects.equal(getContent(), that.getContent())
        && Objects.equal(getCallee(), that.getCallee());
  }

  @Override
  public int hashCode() {
    return Objects.hashCode(
        callHashCode(),
        getContent(),
        callee);
  }
}