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| package org.apache.tapestry.util; |
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| import java.io.Externalizable; |
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| import java.io.IOException; |
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| import java.io.ObjectInput; |
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| import java.io.ObjectOutput; |
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| import org.apache.tapestry.Tapestry; |
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| public class MultiKey implements Externalizable |
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| { |
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| private static final long serialVersionUID = 4465448607415788806L; |
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| private static final int HASH_CODE_UNSET = -1; |
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| private transient int hashCode = HASH_CODE_UNSET; |
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| private Object[] keys; |
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| public MultiKey()
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| { |
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| } |
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| public MultiKey(Object[] keys, boolean makeCopy)
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| { |
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| super();
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| if (keys == null || keys.length == 0)
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| throw new IllegalArgumentException(Tapestry.getMessage("MultiKey.null-keys"));
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| if (keys[0] == null)
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| throw new IllegalArgumentException(Tapestry.getMessage("MultiKey.first-element-may-not-be-null"));
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| if (makeCopy)
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| { |
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| this.keys = new Object[keys.length];
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| System.arraycopy(keys, 0, this.keys, 0, keys.length);
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| } |
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| else |
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| this.keys = keys;
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| } |
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| public boolean equals(Object other)
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| { |
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| int i;
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| if (other == null)
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| return false;
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| if (keys == null)
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| throw new IllegalStateException(Tapestry.getMessage("MultiKey.no-keys"));
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| try
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| { |
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| MultiKey otherMulti = (MultiKey) other;
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| if (keys.length != otherMulti.keys.length)
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| return false;
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| for (i = 0; i < keys.length; i++)
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| { |
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| if (keys[i] == otherMulti.keys[i])
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| continue;
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| if (keys[i] == null || otherMulti.keys[i] == null)
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| return false;
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| if (!keys[i].equals(otherMulti.keys[i]))
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| return false;
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| } |
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| return true;
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| } |
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| catch (ClassCastException e) |
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| { |
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| } |
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| return false;
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| } |
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| public int hashCode()
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| { |
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| if (hashCode == HASH_CODE_UNSET)
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| { |
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| hashCode = keys[0].hashCode();
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| for (int i = 1; i < keys.length; i++)
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| { |
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| if (keys[i] != null)
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| hashCode ^= keys[i].hashCode();
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| } |
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| } |
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| return hashCode;
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| } |
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| public String toString()
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| { |
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| StringBuffer buffer;
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| int i;
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| buffer = new StringBuffer("MultiKey[");
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| for (i = 0; i < keys.length; i++)
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| { |
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| if (i > 0)
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| buffer.append(", ");
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| if (keys[i] == null)
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| buffer.append("<null>");
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| else |
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| buffer.append(keys[i]);
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| } |
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| buffer.append(']');
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| return buffer.toString();
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| } |
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| public void writeExternal(ObjectOutput out) throws IOException
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| { |
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| out.writeInt(keys.length);
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| for (int i = 0; i < keys.length; i++)
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| out.writeObject(keys[i]);
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| } |
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| public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException
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| { |
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| int count;
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| count = in.readInt();
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| keys = new Object[count];
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| for (int i = 0; i < count; i++)
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| keys[i] = in.readObject();
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| } |
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| } |